Planning permission on Metropolitan Open Land without relying on Grey Belt alone

Metropolitan Open Land, usually shortened to MOL, has a habit of appearing at exactly the wrong moment.

It shows up on a site search just as you are preparing an offer on a house with a generous plot, planning to replace a tired bungalow, or hoping to build a family home on land you already own. At that point, the designation can feel like a full stop.

Often, it is not.

The first question people ask me is usually: "Can I build on MOL?" It is understandable, but it is not quite the question that decides whether a project has a future.

The more useful question is this: which planning route fits this specific site, and what evidence would make that route credible?

The answer does not lie in the MOL designation alone. It lies in the relationship between the site's lawful baseline, the routes available and the wider constraints that may still decide whether development is acceptable.

In this article, I will explain the planning routes available on MOL under the NPPF 2026 and the current London Plan, why Grey Belt is only one possibility, how the draft London Plan may change the position, and what to check before you buy, design or apply.

Yes, in some circumstances. But MOL does not reward generic applications, optimistic comparisons or attractive drawings without a clear policy route behind them.

Adopted London Plan Policy G3 gives MOL the same status and level of protection as Green Belt, and protects it from inappropriate development using the national Green Belt tests. The borough Local Plan then adds its own policies on open space, sport, biodiversity, heritage, flooding, design and transport.

A proposal is more likely to have a credible route where it:

Other Green Belt exceptions in Policy GB7, such as agriculture, forestry, engineering operations and material changes of use of land, may also matter.

Even a promising feature, such as an existing house or an area of hardstanding, does not guarantee permission. I think of every MOL scheme as facing two gates: first, a credible policy route; then everything else the site requires, from flood and sports policy to the legal ability to build.

MOL is a London-only strategic designation. It protects open land whose value reaches beyond the immediate street or neighbourhood, and it sits within London's urban area, while Green Belt generally surrounds it.

The essential point is straightforward. MOL and Green Belt remain separate designations. They share a level of protection and, through London Plan Policy G3, part of the same development-control framework. They do not share the same purpose.

That raises two questions worth answering properly: why MOL is protected as firmly as Green Belt, and why the two are still not the same thing.

MOL may matter for recreation, landscape, biodiversity, heritage, public access or the way it breaks up the built-up area. It can include parks, sports grounds, river corridors, golf courses and even parts of private gardens.

That urban setting does not make it a lighter designation. Policy G3 builds a bridge to national Green Belt policy without redesignating the land, so the national exceptions, openness and very special circumstances drive most decisions. G3 also asks boroughs to enhance MOL, which is one reason secured improvements to access, recreation or biodiversity can count in a proposal’s favour.

MOL was not designated to serve the national Green Belt purposes. Greenwich’s 2025 MOL review puts it directly: those purposes do not apply to MOL, and the G3 criteria for MOL do not apply to Green Belt.

Its boundaries work differently too. MOL can be redrawn only through the Local Plan, in consultation with the Mayor and adjoining boroughs, and in exceptional circumstances. An application can secure permission, but it cannot move the line.

So why has a long-standing distinction suddenly become controversial? The answer is Grey Belt. If G3’s bridge carries the national tests across to MOL, does it carry the Grey Belt route too? In 2026, two inspectors gave opposite answers.

The bridge carries the case law too. In Samuel Smith Old Brewery v North Yorkshire County Council [2020] UKSC 3, the Supreme Court confirmed that openness is a matter of planning judgement, in which visual effects may be relevant but are not mandatory.

In R (Heath and Hampstead Society) v Vlachos [2008] EWCA Civ 193, which concerned a replacement house on MOL, the Court of Appeal held that whether a replacement is materially larger is primarily a question of size, not visual impact.

A proposal on MOL is assessed through London Plan Policy G3, national policy and the borough Local Plan, with the direction of policy travel now impossible to ignore.

The adopted development plan remains the statutory starting point. Under section 38(6) of the Planning and Compulsory Purchase Act 2004, decisions must accord with it unless material considerations indicate otherwise.

G3 continues to apply unless and until a new London Plan is adopted. It establishes the strategic position, so it is unsafe to rely only on a borough policy summary or an online map.

Check the adopted policies map for the exact boundary. A line that runs through a garden or close to a building can change which tests apply to which part of your proposal.

The NPPF 2026 was published on 17 August 2026. Its policies became material considerations from that date, so they apply to applications and appeals determined afterwards, including those submitted earlier.

Annex A gives very limited weight to materially inconsistent development plan policies, subject to its exception for policies examined and adopted or made against the new Framework. Other policies should not lose weight simply because they predate it.

Within the NPPF 2026, GB6 and GB7 do the decisive work. GB7 lists development that is not inappropriate and therefore should not be regarded as harmful to the Green Belt or required to demonstrate very special circumstances.

Where no category applies, GB6 permits approval only in very special circumstances. Harm by reason of inappropriateness and any other harm must be clearly outweighed by other considerations, with substantial weight given to harm to the Green Belt, including harm to its openness.

The NPPF 2026 also gives architectural quality a positive role. Policy DP3(5) carries forward the design principle formerly addressed by paragraph 139(b) of the NPPF 2024. It calls for substantial weight for outstanding or innovative designs that deliver high levels of sustainability or help improve design standards locally. To attract that support, the design must also be consistent with its surroundings’ overall form and layout.

Whether a proposal falls within a GB7 category decides which planning balance applies:

S5(5) does not name MOL, and much MOL lies within London’s built-up area, which Annex B treats as a settlement. My reading is that the planning statement should explain whether S4 or S5 applies alongside G3. On a sports ground within a settlement, S4(2) signals that a substantial adverse impact on recreational land protected by HC7 is likely to weigh against approval.

Passing a GB7 test removes the need for very special circumstances, but it does not settle the decision. The development plan, other national policies and statutory duties on heritage and habitats still apply.

S5’s own building categories should not replace the tests applied through G3 either:

This is where architecture stops being a cost and starts earning weight. On land as tightly protected as MOL, DP3(5) offers rare positive support, and it is where our planning and design work most often meet.

For a family home, it can strengthen a proposal that qualifies under GB7, or add real weight to very special circumstances where it does not. It is not an MOL exception, and it rewards proof, not adjectives.

On the MOL homes we design, we build that proof from the first sketch: modelled energy and overheating performance, a landscape-led response to the site, and drawings that show exactly what the design achieves. Done well, it turns a house that merely limits harm into one a decision-maker has positive reasons to approve.

Many otherwise promising schemes come unstuck here.

MOL may overlap with playing fields, open space, nature conservation sites, flood zones, heritage assets, protected trees or strategic views. A proposal may pass the MOL test and still fail another policy, so map these constraints together while the scheme can still change.

Draft Policy PV6 and its supporting text would give MOL its own policy tests, centred on its strategic functions, while retaining very special circumstances. Part G would treat development as appropriate where one of the following applies:

Part F gives substantial weight to harm to MOL’s functions, including openness, and frames very special circumstances around strategic benefits that clearly outweigh it. Paragraph 6.43 states that national policies on Green Belt release and Grey Belt do not apply to MOL, while established precedents on exceptional and very special circumstances would continue to apply.

PV6 is still emerging. Consultation closed on 15 October 2026, examination has yet to take place, and under DM4 its weight depends on the plan’s stage, unresolved objections and consistency with national policy.

That makes it tempting to rush an application. I would be cautious. The final wording, the adoption date and the weight PV6 will carry when your application is decided are all unsettled, and an early submission does not lock in today’s policy. Whatever the route, test the scheme against both the adopted and draft positions before paying for potential that depends on either. Speed is not the same as strength.

Sometimes, and they are the cheapest place to start. Check what consent and rights already exist before commissioning a new application.

A consent may remain capable of implementation, but its time limits, approved scheme, conditions and obligations need checking. If works are said to have commenced, establish whether they lawfully implemented the permission; do not rely on the presence of foundations alone.

Permitted development rights grant permission for specified development without a conventional application. MOL designation does not, by itself, remove permitted development rights. Availability depends on the relevant class, the property's lawful status, applicable limitations and any other protected designation.

Check whether a restrictive condition or Article 4 direction has withdrawn the particular right. Where prior approval is required, follow that procedure before beginning work. A right to change use may not authorise every external alteration the new use needs.

A Lawful Development Certificate may confirm an existing use or development, or the lawfulness of a proposed use or operation. It concerns lawfulness rather than planning merit, and it does not replace prior approval or other consents.

Even where permitted development will not deliver the scheme you want, it may provide a realistic fallback. That can matter when a decision-maker compares the proposal's effect on openness with what could happen anyway.

The one your evidence can actually prove. An alternative case can sit alongside it, but gesturing at several routes without demonstrating any will not strengthen the application.

Existing buildings offer the most familiar starting point. GB7(1)(b) covers their reuse, extension, alteration and replacement, provided the building is permanent, substantial and lawful in planning terms. Establish that baseline before comparing designs, and check which options demolition would remove.

Each of these is judged by its own test, and getting the label wrong can sink a good design. Settle which one you rely on before the drawings go further.

A former clubhouse, stable, institutional building or operational premises may suit a different use, including a home. But a building's physical existence does not prove that it is permanent, substantial, lawful or suitable for the use you have in mind. Its construction, planning history and relationship to the surrounding open land all matter, and a structural survey should show it can take the conversion without substantial rebuilding.

Do not confuse reuse with demolition and rebuild. A scheme that needs the building to come down is a replacement, and a replacement must stay in the same use. A barn rebuilt as a house therefore fits neither category, and land last occupied by agricultural buildings is excluded from the previously developed land definition too.

This category has no separate openness-preservation condition. Any parking, access, lighting, outdoor space and external works needed for the proposed use must nevertheless be justified, and the new use must address its effects on neighbours, movement and the site’s protected functions.

An extension or alteration must not create a disproportionate increase over the original building. The word original matters. Footnote 40 defines it as the building as it stood on 1 July 1948 or, if later, as first built. Earlier additions therefore count against you even where they predate your ownership, so start with a chronology of the house.

The NPPF sets no universal percentage, but local benchmarks often do. Barnet’s guidance suggests no more than 25% over the original volume. Bromley’s Policy 51, covering dwellings in Green Belt and MOL, limits the net floor area increase to 10%.

At Old Vicarage, Sudbrook Lane, Petersham (3290308, dismissed 13 February 2023; application 21/2954/HOT), a house on MOL had already gained a side extension, a basement and a three-storey rear wing. The owner presented a further rear extension as a 14% increase over the existing house. The Inspector said that was not the right comparison. Measured against the slender original Victorian house, the cumulative additions were disproportionate. He also rejected the argument that squaring off the rear was “limited infilling”, and gave little weight to a certified but much smaller fallback.

The decision predates the NPPF 2026, but the test in GB7(1)(b) is the same in substance. The lesson is method: establish the original building and every addition before setting a target size.

Often, yes, and sometimes by more than owners expect. A replacement must stay in the same use and must not be materially larger than the building it replaces. National policy sets no fixed percentage, and a basement counts in the size comparison even where it cannot be seen. But the replacement test is rarely the only route to a bigger replacement dwelling.

At Toppers Oak, Chislehurst (3340629, allowed 10 February 2025; application DC/23/04830/FULL1), a house and its equestrian buildings in Bromley’s Green Belt were treated as previously developed land. On the council’s figures, the new home had around 72% more volume than the existing buildings. But it had a smaller footprint, less hardstanding and much of its extra space below ground, and the Inspector found that the harm to openness was not substantial.

At Springhill Farm, Lower Penn (3345522, allowed 17 December 2024; application 24/00208/VAR), the council approved a replacement it calculated as 68% larger. Very special circumstances were accepted, resting on a realistic fallback from a certified extension and an extant permission, with permitted development rights restricted.

These are not isolated examples. Across Green Belt and MOL decisions, the outcome usually turns on three questions:

When we assess a replacement, we start there, measuring the house and outbuildings and testing any fallback before design begins. That work can reveal more potential than the existing house suggests. Permission for the extra space often comes with permitted development rights removed, so the size you agree is usually the size you keep.

Previously developed land is one of the most valuable routes on MOL, and one of the most misused terms.

GB7(1)(e) allows its redevelopment, including for housing, where it would not cause substantial harm to openness. That is a different test from the replacement size limit, and it can allow more change.

Apply the Annex B definition to the land’s lawful history. Permanent structures, fixed surface infrastructure and large areas of lawful hardstanding may qualify. Curtilage is included, though not as a licence to build across all of it. Residential gardens in built-up areas, parks, recreation grounds, allotments and land last occupied by agricultural buildings are excluded, and much MOL lies within London’s built-up area. Private ownership, fencing or disuse does not turn open land into previously developed land, and a clubhouse does not make a whole sports ground qualify.

At The Boathouse, Ranelagh Drive, Twickenham (6001465, allowed 27 January 2026; application 23/1856/FUL), a 1960s riverside building containing three flats, with its outbuildings, was redeveloped as three new dwellings on MOL. Volume and floorspace increased, partly through a discreet basement. But footprint, height, width, depth and hardstanding all reduced, and the design drew on the neighbouring lock houses. Despite the sensitive location, the Inspector found no substantial harm to openness.

MOL often contains sports clubs, pavilions, pitches and recreation grounds. These sites can create opportunities, but they are not policy-free zones.

Appropriate facilities for outdoor sport and recreation may qualify under GB7(1)(f)(iv), including buildings connected with an existing use or change of use. Their impact on openness must be minimised, and they must avoid significant conflict with Green Belt purposes. Design the whole operation around that test. Courts, buildings, canopies, fencing, parking, lighting and activity together determine the effect, and a community-use label is no substitute.

At L A Sports Club, Beckenham (3331069, dismissed 11 September 2024; application DC/22/02033/FULL1), a garage on MOL had been converted into a café with covered seating. The Inspector accepted that it could be an appropriate facility for the club and found only limited harm to openness. But the test then required openness to be preserved, and limited harm was not preservation. It also failed on three further points:

Under today’s test, which asks for impact to be minimised rather than openness preserved, limited harm is no longer fatal in itself, so a better-designed scheme might now succeed. The other lessons still apply. Evidence every technical issue, and remember that an open-sided canopy or covered terrace can add bulk even without walls and can count when proportionality is judged.

Station-led development has a separate category under GB7(1)(h). It does not require Grey Belt status or evidenced unmet need. For MOL, justify its application through adopted G3 and assess the emerging policy position rather than assuming proximity alone creates entitlement.

The development must:

Reasonable walking distance means around 800 metres, or around ten minutes where topography, route quality or physical barriers would discourage the walk. Only the part of a site within that distance benefits, so an entrance on the wrong side of a railway can change the whole assessment.

Policy L3(2)(c) then requires at least 35 dwellings per hectare, or 45 where services run at twice the qualifying frequency. A single family home would need the below-major exception where that density is inappropriate or impossible, which is unavailable on a site of 0.5 hectares or more.

Where development is inappropriate, a very special circumstances case must show that other considerations clearly outweigh all the harm. Very special circumstances are not a checklist of generic benefits. Housing, access, biodiversity, heritage, employment and sport may contribute, but their weight depends on evidence.

A benefit that is already required by policy, unquantified, vague or not secured will usually carry less weight than one that is specific, independently evidenced and legally deliverable.

The circumstances do not have to be rare. In Wychavon District Council v Secretary of State for Communities and Local Government [2008] EWCA Civ 692, the Court of Appeal explained that rarity is not essential and ordinary factors may combine into something very special. Their weight and combined effect must still satisfy the demanding balance on the particular facts.

The strongest cases tend to share a disciplined structure:

For a single family home on empty land, that is a high bar. A genuine wish to build a home is unlikely to carry decisive weight by itself.

Because openness decides two things: whether some routes are open to you at all, and how heavily any harm counts against you when they are not. More than any other issue, it shapes how big your building can be, where it sits and what it looks like.

It is also widely misunderstood. Openness is not about whether people can see a building. A house hidden behind trees still takes up open land. A visible one may barely matter if it sits among other buildings.

The test you face depends on the route you are using. If you are redeveloping previously developed land, you must show there would be no substantial harm to openness, and that decides whether the route works at all.

Sports facilities must keep their impact to a minimum, so the design does much of the work. Extensions and replacements are judged on size instead. The Grey Belt and station routes have no openness test of their own, although some local policies add one. If your proposal counts as inappropriate development, any harm to openness weighs heavily against it.

When openness does need assessing, planning officers and inspectors look at how much space development takes up, how visible it is, how long it will last, whether the land could be restored and how much activity it brings.

This is the physical presence of development. Compare footprint, height, volume, hardstanding and spread. Then ask whether the proposal stays where buildings already sit or moves into open land, fragments it, or encloses it with walls, fences or outbuildings. A permanent building is also assessed differently from a structure that can be removed.

The least glamorous choices often matter most. On a house plot, for example, the driveway, terraces and parking can affect openness as much as the floor area, so draw the complete proposal. Pulling built form towards existing buildings, reusing an access and limiting hard surfaces can reduce harm without reducing quality.

This is how people see and experience the site, from roads, footpaths, parks, waterways and the entrances to open land. Choose views that reveal how buildings relate to open ground. Test winter views where screening is deciduous, because July photographs can flatter a scheme. Planting does not solve a spatial problem, so rely only on screening you can realistically retain.

Architecture helps where visual effects matter. Lower eaves, a roof stepping down towards the open side, recessive materials and boundary planting can all reduce prominence. They cannot change the size tests: a replacement must still not be materially larger, and an extension must still avoid a disproportionate increase over the original building.

Traffic, lighting, parking, seating, storage, deliveries, events and domestic paraphernalia can change how open land is perceived, especially where the character of use changes. That is why councils may control them by condition, including by restricting permitted development rights.

Keep these effects in their proper policy boxes. Noise is an amenity issue, lighting near bat routes is an ecological one, and new hard surfaces raise drainage questions. A good answer on one does not answer another.

Start with facts: what is lawfully on the site, what an implementable permission allows, and what could realistically happen without the proposal. A permission you hope to obtain is not a baseline, and a claimed permitted development alternative needs checking against the actual right.

A realistic fallback position is relevant if it has a real prospect of occurring. Under Mansell v Tonbridge and Malling Borough Council [2017] EWCA Civ 1314, it need not be probable or likely. Relevance and weight are separate questions. A fallback need not match the proposal to be relevant, but its weight depends on how likely it is and how it compares. Set out the actual differences in footprint, height, volume, visibility and intensity on equivalent drawings. A smaller fallback may carry limited weight without being irrelevant.

Private garden land, sound ecology evidence and a permitted development fallback did not outweigh MOL harm.

At 2 Somerford Way, Southwark (3323439, dismissed 27 February 2024; application 21/AP/2514), a two-storey self-build house on MOL was inappropriate development under the December 2023 NPPF. Standing mostly in the side garden of an existing home, it would have caused significant harm to openness, both spatially and visually.

The permitted development fallback, an outbuilding, was realistic but materially smaller and lower. Acceptable ecological evidence did not overcome the openness harm, and without a satisfactory legal agreement the scheme also conflicted with biodiversity and affordable housing policy.

Private ownership, screening and the ability to build a smaller outbuilding within the domestic curtilage do not make garden land suitable for a house. Test the exact proposal against the adopted boundary and the real fallback first.

This is what a winning case at the demanding end of MOL looks like.

At Footzie Social Club, Lower Sydenham (3257010, allowed 29 March 2021; application DC/20/00781/FULL1), an appeal against non-determination secured 254 homes in buildings of four to eleven storeys. The Inspector treated the built element as inappropriate development on MOL, so very special circumstances were needed.

Two things carried the case.

First, the baseline was measured, not asserted. The Inspector classed 37.98% of the site as previously developed land. That figure described the land’s status, not how much could be built. An implementable 2019 permission for housing gave a real comparison, and the new scheme had no greater effect on spatial openness. Buildings, access, parking and gardens took up just over a third of the site, and the rest became public open space.

Second, the benefits were real and secured: new homes, public access, riverbank planting, biodiversity gains and a missing link in the Green Chain and Waterway route. The 49 affordable homes, all discounted market sale, had not been shown to be the most the scheme could deliver, which conflicted with policy. Given the housing shortfall, the Inspector gave that conflict limited weight and the affordable homes themselves substantial weight.

Footzie is not a precedent for dense housing on MOL. Its lesson is method: measure the baseline, compare against a real alternative, contain the footprint and secure what you offer.

Grey Belt policy has created understandable interest among owners of constrained, underused and developed land. It has also created a risk of overstatement. On MOL, a case may be arguable through adopted G3, but its application remains contested.

Grey Belt is a classification within Green Belt, not a separate designation. Annex B covers land, previously developed or not, that does not strongly contribute to checking unrestricted sprawl, preventing towns merging or preserving the setting and special character of historic towns. Countryside encroachment and urban regeneration are not part of the test.

The common error is to reverse the analysis. The question is not whether an MOL site fails purposes it was never designated to serve. It is whether G3 makes the Grey Belt route available at all, and whether the evidence shows that this particular site meets the definition and every other requirement.

Enclosure by development may reduce a site’s contribution to checking sprawl, but it is not conclusive. Land in Greater London may still help keep places apart or contribute to the setting of a historic town.

The NPPF 2026 also removed the former footnote 7 exclusion. Flood, heritage or habitat constraints may no longer block classification in the same way, although their own policies still shape what can be built.

Possibly, on particular facts, but the question is genuinely disputed.

This is one of the most controversial questions raised by the Grey Belt reforms. Practitioners, ourselves included, question whether G3, by applying national Green Belt tests to MOL, also brings in a classification written specifically for Green Belt, and planning barristers have debated it too. Inspectors have split. In Greenwich, one applied the Grey Belt test to a constrained MOL parcel and found that it qualified.

At Powerleague, Bobby Moore Way, Barnet (6003015, dismissed 29 April 2026; application 24/5616/FUL), another took the opposite view: the land was MOL, not Green Belt, and open land within the city does not serve the purposes the test examines. That scheme, padel courts with canopy roofs on four of 13 football pitches, also failed on openness, character and wildlife, so the dismissal did not turn on the interpretation alone.

Local Government Lawyer reported on 3 September 2026 that Greenwich had challenged its June decision in the courts. No outcome could be confirmed as at 17 October 2026, so check the current position before relying on it. Draft PV6 would settle the question through paragraph 6.43, but it has not replaced G3.

My reading is that Greenwich supports investigating a case on suitable land, not valuing all MOL as housing land. A site can contribute little to Green Belt purposes and still matter greatly for recreation, landscape or ecology.

This is the point I would press hardest. A Grey Belt argument can succeed at the first gate and still fail at the second.

Gate one is the policy route itself: the classification and every requirement of GB7(1)(g). Gate two is everything else: open space, sports, ecology, flood, heritage, tree, transport and access policies, and the legal ability to build. Trusts, restrictive covenants, leases and access rights can all stand between a permission and a project.

Classification can improve the policy starting point without increasing the site's usable capacity. You can win the argument and still lose the site.

An MOL Grey Belt case needs far more than a photograph of a disused yard or a description of a constrained site. Even classification is not enough. Under GB7(1)(g), the development must:

For housing, footnote 41 identifies unmet need through a lack of five-year housing land supply, including the applicable buffer, or a Housing Delivery Test result below 75%. That applies to a single home as much as to a larger scheme, but general demand for homes does not establish a need for every proposed use or ancillary building.

For TR3's sustainable location assessment, consider the Connectivity Tool alongside actual routes, services and transport choices, and identify any improvements that must be secured.

Explain the assessment area and its wider context using Annex E's assessment method. It is written for plan-making, but it is a relevant reference point for a site-specific case. An artificially narrow area may obscure the land's role; an overly broad one may conceal important differences.

It is a demanding exercise. But it is far more useful than treating Grey Belt as either a guaranteed route or a complete irrelevance. And it is still only the first gate.

Four homes were allowed in principle on MOL, the Greenwich decision behind the controversy.

At Angsamus, Weigall Road, Greenwich (6005520, allowed 18 June 2026; application 25/3788/PIP), the Inspector applied the December 2024 NPPF, through G3 and Greenwich Policy OS2, to former tennis court land beside Crofton Albion Sports and Social Club. Hemmed in by recreation land, the River Quaggy, the road and housing, the parcel made a useful but not strong contribution to checking sprawl. There was no evidence of a strong contribution to the other purposes, and no former footnote 7 policy had been raised.

Greenwich’s 2.38-year housing land supply established unmet need, the sustainable location was undisputed, and the small scheme would not fundamentally undermine the purposes of the remaining Green Belt. The land’s disuse and lack of public access played no part in the decision.

Permission in principle fixed location, use and exactly four dwellings. Flood risk, wildlife, trees, highways and neighbour effects were left for technical details consent, with no automatic entitlement to it. Not every constraint can wait, though: where a protected habitats site may be significantly affected, an appropriate assessment is required before permission in principle is considered. For a single new home, the same route can test location, use and amount before detailed design, although it is not available for householder extensions.

Angsamus shows that a Grey Belt argument can succeed on MOL, not that the homes will be built.

When they are real, additional and secured. Sports clubs, recreation grounds, golf-related land and riverside spaces can support a benefits case, but they also attract extra policy protection.

Policy HC7 protects existing open space and recreational land and facilities. Its exceptions include demonstrated surplus, qualifying replacement provision, public service infrastructure with equivalent or better replacement provision, and alternative recreational provision whose benefits clearly outweigh the loss.

Before relying on a public benefit case, work through the obvious objections:

The last question matters most. At Powerleague, sporting benefits achievable without the canopy roofs carried little weight. A weak trading position or restricted access does not remove the protection either.

Public benefits are strongest when they are direct, measurable, additional and secured by condition or obligation, with delivery and long-term maintenance established.

Private ownership, restricted access or commercial underperformance do not make a golf course or playing field previously developed land. A clubhouse or car park may create a developed baseline, but the wider recreational land must be assessed separately.

In Save Wimbledon Park v Mayor of London [2025] EWHC 1856 (Admin), the High Court explained that planning permission establishes acceptability in land-use terms and does not override existing property or statutory rights. The relevance of implementation obstacles to planning merits depends on the facts; an obstacle does not automatically require refusal.

As at 17 October 2026, that planning judicial-review case was awaiting the Court of Appeal's judgment following its October hearing. The appeal concerns when a statutory barrier to delivery must be treated as a material planning consideration.

The separate March 2026 statutory-trust judgment held that the former golf-course land was not subject to a statutory trust for public recreation. Restrictive covenants and other rights remained separate questions, and permission to appeal that separate ruling was granted in July 2026.

For a landowner, the distinction is between an acceptable scheme and the legal ability to build it. Ask your solicitor to resolve rights and restrictions before purchase, and assume neither that an obstacle guarantees refusal nor that permission removes it.

No. Urban Open Space (UOS) is a local designation, governed by the borough’s own policies, which usually protect open character, landscape setting or a visual break in the built-up area.

MOL has strategic, London-wide protection through G3. Grey Belt, the Green Belt exceptions and very special circumstances do not apply simply because land is UOS. Local Green Space is different again: NPPF Policy HC8 applies Green Belt decision-making policies to it, but expressly excludes the Grey Belt and previously developed land provisions.

So read the designation that actually applies before borrowing an argument from another site.

What UOS and MOL share is the planning challenge. Councils worry about lost openness, the enclosure of space that reads as open, harm to landscape character and the gradual erosion of protected land, one plot at a time. Arguing that a site is scruffy or underused rarely answers that.

Restraint does. Reduce the footprint, keep meaningful open space, move built form away from sensitive edges and public views, and strengthen landscaping and biodiversity. Design can reduce harm without removing every policy conflict, but the schemes that succeed build that restraint into the drawings rather than bolting it on to the planning statement afterwards.

This one is ours, and restraint made the case winnable.

At School House, Avebury Road, Bromley (3252270, allowed 10 February 2021; application DC/19/04766/FULL1), we secured full permission on appeal to replace a substandard post-war house with two homes. The suburban plot, around 500 sqm beside school grounds and woodland, was designated UOS.

We proposed two well-proportioned semi-detached homes, positioned at right angles to the street and concentrating much of the additional built form away from the frontage. Trees, shrubs and rain gardens formed part of the landscape response.

Our appeal calculations recorded a net loss of undeveloped land of 24 sqm; the council put the increase in building coverage at about 32 sqm. The Inspector did not resolve that difference. He focused on the similar frontage width, separation from three boundaries, limited proportion of the plot occupied, landscaped setting and screening. Although the replacement was taller and deeper, its effect on openness and the visual break was limited.

The Inspector nevertheless found conflict with Local Plan Policy 55. Replacing the substandard house and providing an additional home were benefits, with the housing shortfall giving the extra home significant weight. Applying the NPPF then in force, he found that adverse impacts did not significantly and demonstrably outweigh the benefits.

Our design limited the harm; the contemporary planning balance justified permission despite the conflict. Neither the footprint figures nor that historical balance supplies a current MOL exception. For a new proposal, test the design against the actual designation and establish the benefits and housing evidence relevant at determination.

MOL should change the way you assess a purchase. It should not automatically end the deal.

The core commercial question is whether the property has a credible, deliverable planning route at a price that reflects the risk. Before exchange, an option agreement or major design spend, this is the due diligence that decides whether an MOL site is an opportunity or a trap.

Before exchange, I would resolve an access or structural question capable of removing the preferred option, even if that delays detailed design. Where the evidence leaves two credible schemes, compare their capacity and costs. Where neither supports the asking price, renegotiation or stopping may be more useful than another design iteration.

Where GB8 applies, the Golden Rules cover any major development involving housing, not just Grey Belt or station schemes. On MOL, explain how they are engaged through the route you rely on.

Major housing development means ten or more homes, or a site of 0.5 hectares or more. On the NPPF’s wording, even a single house on a site that size qualifies, and the threshold uses the application site area, not the smaller net area used for density.

GB8 requires affordable housing, necessary infrastructure and publicly accessible green space. Until a local plan sets its own figure, affordable housing is generally 15 percentage points above the highest otherwise applicable requirement, capped at 50%, with a 50% default where no requirement exists.

Viability arguments are allowed only in narrow cases, such as previously developed land with legacy costs, and contributions must still be maximised. Specified earlier permissions, plan releases and traveller sites are exempt.

Most importantly, DM5(3) says the price paid cannot justify falling short of policy. Work out capacity, contributions and costs first, then decide what the land is worth.

The strongest applications are built around the actual policy route, not a broad claim that the proposal is sustainable or sensitive. The planning analysis, drawings and technical evidence must describe the same workable proposal.

A Design and Access Statement for MOL should not begin with a generic quotation from G3. It should explain the designation, the lawful baseline, the route relied upon, any relevant effect on openness and how each benefit will be secured.

Where architectural quality forms part of the case, show how the siting, form, materials and environmental performance support that argument, with drawings and technical evidence that substantiate the claims.

A planning statement should establish the applicable policies and balance without duplicating that commentary.

On MOL, planning drawings are part of the argument rather than presentation extras. They should show:

Category 3D of the Mayor of London Order makes an application referable to the Mayor where development on land allocated or proposed as Green Belt or MOL involves constructing a building exceeding 1,000 sqm of floorspace, or a material change of use of such a building. Other referral categories may also apply.

Check the Mayor's referral requirements early, and engage the relevant authorities and infrastructure providers in good time. The 2026 amendments also extended call-in powers to Category 3D, subject to transitional provisions.

On complex proposals, we prepare and lead pre-application advice for our clients once there is enough evidence and an initial design to test. We put three questions to the council: which policy category it considers applicable, which findings it disputes and what evidence would resolve them. The advice is not binding, but it shows our clients where the next pound is best spent.

We treat the pre-application submission as seriously as the application itself. A weak one can set an unhelpful narrative that carries through to the application. A strong one defines the real policy question, and the council’s response shows whether to develop the scheme, narrow it or rethink the strategy before more money is committed.

A refusal is not the end of the project. But a planning appeal is not automatically the right answer either. The choice turns on one question: why did the proposal fail?

Read the refusal notice alongside the officer report and consultation responses. If the problem is avoidable, such as poor siting, excessive scale or missing evidence, a revised application is usually the better route. An appeal suits a scheme whose evidence already answers the policy tests, where the council’s judgement can be challenged persuasively.

Under the appeal procedure for applications made on or after 1 April 2026, most refusal appeals are decided on written evidence, with little scope to add new material or amend the scheme. An appeal is not the place to fix a weak application.

MOL cases demand more. The strategy should never be that the council was simply too strict. The appeal must show a clear policy route, answer the identified harm and resolve every other issue at once. Miss one, and a favourable finding on MOL will not save it.

Read enough MOL decisions and a pattern emerges. The schemes that succeed rarely win an argument about the designation. They make that argument unnecessary, because the route, the baseline and the design all point the same way before the application is submitted.

That is why I am often more optimistic about MOL than owners expect. The potential usually sits in details a quick appraisal misses:

Design then turns that potential into permission. A compact, well-sited home with demonstrable environmental performance can earn positive weight under DP3(5), rather than simply asking to be tolerated.

Grey Belt deserves investigation, but I would not let it set the price. For a single house, it depends on the borough’s housing figures, a contested reading of G3 and a draft London Plan that proposes to remove the bridge. The strongest cases work without it, and that is how we prepare them: as appeal-ready files from the first submission.

MOL is a serious designation, and it rewards seriousness in return. It protects land London values, and no scheme should treat it as a loophole.

But it is rarely the end of the conversation. A properly measured lawful baseline, a route the proposal genuinely fits and a design that achieves more with less can unlock more than the policy map suggests.

A planning feasibility assessment tests all three before you commit to the land or a detailed application. On MOL, the cheapest mistake is the one you avoid by testing the route first. The most expensive is the one you make after falling in love with the design.

On MOL, the cheapest mistake is the one you avoid by testing the route first. The most expensive is the one you make after falling in love with the design.