4 Key reasons HMO planning applications fail

You have checked the bedroom sizes, provided a kitchen and shown where the bicycles will go. On paper, your HMO (House in Multiple Occupation) conversion appears to meet the council’s requirements. Then the decision arrives: planning permission has been refused.

The difficulty often lies in how those elements work together. A bedroom may meet the minimum floor area but face a blank wall. A cycle store may have enough spaces but require residents to carry bicycles through the shared kitchen. Other objections concern whether the borough supports an HMO at that address at all.

In this article, I will explain four recurring reasons HMO planning applications fail in London, what recent decisions reveal and how to judge whether your proposal needs redesign, stronger evidence, fewer residents or an appeal.

The four concerns are living conditions for residents, disturbance to neighbours, conflict with location and housing policies, and unresolved external works, access or safety issues. A proposal may fail on several grounds, so the next step is to understand which objections actually decided the case.

The council’s assessment begins with the property’s lawful use and what you propose to change. Establishing that starting point helps determine whether permission is needed and how the effects of your proposal should be assessed.

Converting a family house into a small HMO for three to six residents normally falls under permitted development, allowing the change without a planning application. However, you need planning permission for an HMO where an applicable Article 4 direction removes that right.

For larger HMOs, the position is different: converting a family house into an HMO for more than six residents normally requires a planning application whether or not an Article 4 direction applies.

These thresholds count residents, not bedrooms: a couple sharing one room counts as two people. Existing planning conditions and proposed building works also need checking before deciding which permissions are required.

Where an application is required, the council assesses whether the proposal is acceptable at that location, provides good accommodation and protects neighbouring residents. Meeting the bedroom-size standards answers only part of those questions.

The starting point is the development plan: the London Plan, your borough’s Local Plan and any adopted neighbourhood plan covering the property. The council must decide your application in accordance with that plan unless other material considerations justify a different outcome.

The NPPF 2026 is one of those considerations. It supports development within settlements, but its design and living-condition requirements can also provide grounds for refusal. Policy DP3(3) directs refusal where a proposal conflicts, without clear justification, with relevant design principles or explicit development-plan design standards. Policy P3 addresses living conditions, including adequate natural light.

The NPPF 2026 also affects how much weight existing policies carry. Those materially inconsistent with its decision-making policies generally receive very limited weight. A policy does not, however, lose weight simply because it is older.

For your application, the question is how these policies apply to the particular property and proposal. Housing benefits may outweigh a shortfall, while serious harm to residents or neighbours can still justify refusal.

You may have a house with enough space for several bedrooms, good transport links and clear demand from prospective tenants. Yet securing permission depends on how well the proposal works as a home, how it affects the neighbours and whether the council’s policies support the conversion at that address.

The difficulties usually fall into four areas:

Understanding which concerns affect your property helps you decide what to change and which objections you may have grounds to challenge.

The following four common reasons for HMO planning refusal show how those judgements work in practice. Each section explains what concerned the decision-maker, why the proposal succeeded or failed, and what you can learn from the outcome to strengthen your own application.

A bedroom’s floor area is the starting point. Councils also consider its outlook, daylight, privacy, shape and relationship with shared facilities. National licensing minimums do not settle the planning assessment, and borough standards may require larger rooms depending on the layout.

At 3 Aldeburgh Street, Greenwich (26/1666/F, refused 9 October 2026), the owner sought a four-bedroom, four-person HMO with a rear extension. Greenwich Council accepted the principle of the use and all four bedrooms met its size standard. However, Room 1’s only window faced a brick wall about two metres away across a narrow lightwell.

The application included neither a daylight assessment nor a visual showing the outlook. Greenwich Council refused permission on four grounds: the extension’s design and siting, Room 1’s poor outlook and daylight, insufficient flood-risk information and inadequate access to the rear cycle store. Adequate bedroom floor area had not demonstrated acceptable accommodation. This example concerns the council’s refusal, rather than an appeal decision.

For your own proposal, look beyond the room schedule. A section through the window and the obstruction outside can reveal a problem that a floor plan and an area calculation leave unexplained.

At Goodmayes Lane, Redbridge (6010379, dismissed 15 September 2026), the proposal would enlarge a small HMO to accommodate up to 11 people. Redbridge Council refused permission, raising concerns about communal accommodation, parking and highway safety, the location, effects on neighbours and the loss of family housing. The owner appealed, and the Inspector examined each issue separately.

The two kitchens provided adequate cooking space, and the bedrooms exceeded the council’s minimum sizes. However, the kitchens could not reasonably accommodate dining furniture, leaving residents reliant on a separate communal room.

That room measured only 8.2 sqm, including a shower room, against the guidance’s 21 sqm requirement. The Inspector agreed with the council that the communal accommodation was inadequate and also found unresolved parking and manoeuvring concerns. Those problems justified dismissing the appeal.

Other council objections carried less weight. The Inspector found no unacceptable harm to neighbours and no loss of an existing family home, because the property was already a small HMO. Although it lay outside the designated centres required by local policy, its actual access to shops and transport meant that conflict received only limited weight.

The relationship between circulation and shared space was central at Bournewood Road, Bromley (6009605, dismissed 1 September 2026). Bromley Council had refused an eight-person HMO conversion because of concerns about the accommodation for residents and noise and disturbance to neighbours. The owner appealed.

Most bedrooms were generous and well finished, but the kitchen offered very limited space for communal dining and living. Residents would also have to bring bicycles through that room to reach the principal rear store.

The Inspector agreed that the accommodation was inadequate for future residents, also finding insufficient evidence of satisfactory light and ventilation to the top-floor room. However, the Inspector did not uphold the council’s neighbour-disturbance objection: the centrally positioned entrance and the evidence available did not demonstrate unacceptable effects on nearby homes.

The appeal was dismissed because the accommodation defects remained. This distinction matters: an owner could have answered every noise concern and still needed to redesign the accommodation.

At Melthorpe Gardens, Greenwich (26/2216/F, refused 7 October 2026), the owner proposed a five-bedroom, six-person HMO without a separate lounge. Greenwich Council assessed the single bedrooms against a 9 sqm minimum, which three rooms failed to meet. It refused permission because bedrooms 1, 3 and 4 were undersized and the submission lacked floor-to-ceiling-height information.

This example concerns the council’s decision, rather than an appeal outcome. It illustrates why converting a lounge into another bedroom requires a fresh assessment of the standards applying to the remaining rooms.

Before converting a lounge into another letting room, ask your architect to test the whole arrangement against the borough’s standards. The additional bedroom may leave both the shared accommodation and other bedrooms below the required standard.

A different balance was reached at Eastwood Road, Redbridge (6010195, allowed 9 September 2026). Redbridge Council refused the conversion of a four-bedroom family house into a small HMO over internal space, the loss of family housing and the adequacy of site management. The owner appealed against that refusal.

Five bedrooms appeared on the submitted plans. One single room measured 6.7 sqm against the council guidance’s 7.5 sqm minimum, and the Inspector agreed with the council that it would feel overly constrained and conflict with the development plan.

The Inspector reached different conclusions on the other objections. The loss of this particular family house was not found to conflict with the housing policy when read as a whole, and a management plan could be secured by condition. The Inspector then weighed the remaining bedroom defect against the benefits of housing choice and more effective use of the property.

The appeal was allowed because the identified adverse effects did not substantially outweigh those benefits under the national policy assessment. Permission was granted subject to conditions, including approval of a management plan and cycle and refuse arrangements. The council’s bedroom concern was accepted, but its overall refusal was overturned.

This was a judgement about that proposal, rather than approval of 6.7 sqm bedrooms as a general standard. At Goodmayes Lane and Bournewood Road, the shortcomings in communal accommodation justified dismissal. At Eastwood Road, the Inspector expressly weighed the bedroom defect and reached a different conclusion. Your planning case needs to explain the particular harm and benefits, rather than rely on another owner’s successful appeal.

If resolving the shortcomings means removing a bedroom, revisit your HMO investment strategy before resubmitting. The income assumption should follow a layout that has credible planning prospects.

Where a bedroom has a constrained window, your architect can draw sections and views showing what the resident would actually see. Moving the bedroom or changing an extension may provide a better arrangement. A proportionate daylight assessment can establish whether natural light is adequate, but a favourable result does not by itself resolve poor outlook.

Assess shared facilities against the intended number of residents, including couples, and show furniture and circulation realistically. Check how the borough’s standards apply to each option, particularly where a lounge is being removed. Keep bicycle circulation separate from cooking and living space wherever the building allows.

If the house cannot provide acceptable bedrooms and shared facilities at the proposed occupancy, test fewer residents before resubmitting. A revised layout gives the council something different to assess; repeating the same arrangement with a longer planning statement may leave the decisive objection intact.

The council considers where activity will occur as well as how many people will live in the property. Entrances, side passages, gardens, party walls, bins and bicycle routes all matter. The comparison should reflect the lawful existing use and any realistic fallback position: the lawful use or development that could realistically take place if the proposal were refused.

At Ceres Road, Greenwich (6007470, dismissed 30 September 2026), the owner proposed a seven-bedroom, seven-person HMO with associated alterations. Greenwich Council refused permission because of noise and disturbance to the adjoining occupiers. Permission already existed for six residents, so the owner’s appeal needed to address the effect of the seventh person against that realistic alternative.

The mid-terraced house’s front door sat directly beside the neighbour’s entrance and bay window. The Inspector agreed with the council that additional comings and goings would harm the neighbour’s living conditions and found insufficient evidence to conclude otherwise. Sound insulation and management conditions would not resolve the external activity beside the neighbouring home.

The appeal was dismissed on noise and disturbance grounds. Accommodation standards, parking and several other matters had not formed reasons for the council’s refusal and did not overcome that harm.

An increase of one resident may look modest on a plan. Its effect still depends on where that person, their visitors and deliveries will pass.

Two appeals decided on 3 September 2026 show how closely this assessment depends on the building and its surroundings.

At Bexley Road, Bexley (6010832, dismissed 3 September 2026), the council refused a seven-person HMO with roof alterations because of noise and disturbance to neighbouring occupiers. Its officer had found the roof works acceptable; the dispute concerned the activity associated with the use. The owner appealed, relying in part on permission for six residents as a realistic fallback.

The proposed side entrance would take residents past nearby windows and through an open passage with little screening.

The Inspector agreed with the council’s concern about the effects on neighbours. Although the six-person permission received significant weight, the seventh resident would add to a cumulative level of activity that was considered unacceptable. The appeal was dismissed because of noise and disturbance. The acceptability of the roof works did not resolve the effects of the use and access arrangement.

At Broomwood Road, Bromley (6011388, allowed 3 September 2026), Bromley Council refused an eight-person HMO because it considered that the intensified occupation would affect the area’s residential character and disturb neighbours. The owner appealed. The detached house was already occupied as a six-person shared property, but the lawfulness of that use was disputed and was not settled through this appeal.

The physical setting was materially different from Bexley Road. The house stood beside a drive-through collection point and car park, had no party wall with the adjoining home, and benefited from boundary screening. There were no first-floor windows on the neighbour’s side wall overlooking the passage.

The Inspector disagreed with the council that the additional activity would unacceptably affect local character or neighbours’ living conditions. The appeal was allowed and permission granted, subject to conditions including an eight-person occupancy cap, a management plan and storage details.

These proposals involved different increases in occupancy as well as different sites. Their useful lesson is how the relationship with neighbouring homes affected the decision. Show where residents will enter, what they will pass and how boundaries and separation will limit the effects.

At Ewart Grove, Haringey (6008251, dismissed 14 October 2026), Haringey Council refused a five-bedroom HMO for eight residents, raising concerns about the loss of family housing, HMO concentration and disturbance to neighbours. Although the property had an HMO licence, its lawful planning use remained a single dwellinghouse.

The owner appealed and relied on an acoustic assessment submitted during the appeal. It predicted negligible increases in the noise it modelled, but concentrated on people talking.

The Inspector did not dispute the technical modelling, but agreed with the council that the activity would unacceptably disturb neighbours. Deliveries, vehicle pick-ups, late returns and repeated trips to bins and bicycles by separate households were not fully captured in the report.

The appeal was dismissed because of noise and disturbance and the additional concentration of HMOs. The council’s separate family-housing argument did not succeed: the original house exceeded the policy’s 120 sqm threshold, and the Family Housing Protection Zone policy did not govern this form of conversion. Meeting those tests did not answer the remaining objections.

Sound insulation can improve separation through walls and floors, while a management plan can organise waste collection and complaints. Neither changes the position of a side passage beside a neighbour’s window. Ask the acoustic adviser to assess the activity the layout will actually generate, and use the findings to inform the design.

Your architect can test whether relocating an entrance, changing bin and bicycle routes or improving boundaries would reduce disturbance. Plans, sections and photographs should show those relationships clearly. Where sound transmission through the building is disputed, coordinate acoustic advice with the proposed construction.

Where the site cannot accommodate the additional activity comfortably, reduced occupancy may offer a better route. I would examine a seventh resident particularly carefully where six are already permitted, considering the extra income alongside the effect on neighbours. Fewer residents will help where the objection arises from that increase; separate policy or accommodation defects still need resolving.

Some borough policies protect family houses or set requirements for original floorspace, HMO concentration, housing need or accessibility. These can determine whether conversion is acceptable before the detailed layout is considered. Establish which planning policies for HMO conversions apply to your property before commissioning extensive redesign.

Haringey Council’s refusal of the eight-person proposal at Ewart Grove also turned on the concentration of HMOs. On appeal, the appellant counted nine licensed HMOs among 98 separate addresses, about 9%. The council counted eight among 43 original houses, about 18%.

The Inspector accepted the council’s approach because counting individual flats separately enlarged the total against which HMOs were measured. Each conversion could dilute the apparent concentration while removing another original house. That supported the council’s concentration objection and, alongside the noise concerns, justified dismissing the appeal. The decision did not establish 18% as a fixed borough threshold: the adopted policy contained no specific percentage limit.

Your planning consultant should check the survey area, which properties belong in the calculation and the evidence of HMO use. Licensing records alone may not identify every property relevant to the planning test.

Council evidence also needs scrutiny. At Kimberley Gardens, Haringey (6011332, dismissed 9 October 2026), Haringey Council refused the conversion of a house into an HMO for six residents, disputing its effects on local character, neighbours, parking and housing need. The council also argued that it would add to an excessive concentration of HMOs.

On appeal, the Inspector found insufficient evidence to substantiate the concentration objection and did not uphold the council’s family-housing case. However, the Inspector agreed that noise, disturbance and parking pressure would affect the closely spaced residential street unacceptably. Those concerns justified dismissing the appeal. Challenging the concentration calculation had therefore answered only part of the case.

At Sunny Gardens Road, Barnet (6013025, dismissed 14 October 2026), Barnet Council refused a small six-bedroom HMO, maintaining that the location was unsuitable in terms of family housing, local character and identified need, and that the parking arrangements were inadequate. The owner appealed.

The documents gave conflicting accounts of the existing use. The Inspector agreed with the council’s starting point that the claimed HMO or flats use was not evidently lawful: an HMO licence did not establish the planning position, so the proposal was assessed as involving the loss of a family house.

The Inspector also agreed that existing occupation demonstrated demand rather than the identified need required by the borough’s policy in that location, and found an adverse effect on the street’s family residential character. A submitted undertaking did not adequately secure the necessary parking-permit restrictions. The appeal was dismissed because the owner had not overcome either the location and housing concerns or the parking objection.

At Finchley Lane, Barnet (6010839, allowed 25 August 2026), Barnet Council had refused a five-bedroom HMO for up to six people because it was not satisfied that an identified local need had been demonstrated or that the location was sufficiently accessible. It prioritised family housing and considered that new HMOs would be better located in local centres. The owner appealed against that assessment.

Local estate agents described a shortage of HMO accommodation. Although the council had not accepted that evidence, the Inspector found that it demonstrated an identified local need. The property’s earlier HMO history and walking and cycling access to Middlesex University and local facilities also mattered.

The Inspector acknowledged the shortfall against the public transport accessibility expectation but considered a departure justified by the property’s history and local circumstances. The appeal was allowed and permission granted subject to conditions covering matters including cycle and refuse storage, parking and privacy screening.

The council’s refusal was therefore overturned through a different assessment of the evidence and planning balance. Compared with Sunny Gardens Road, the distinction involved the quality of the need evidence, the property’s history and accessibility, and the other unresolved policy concerns.

Check the lawful starting use and original floorspace from reliable records. Where a policy measures the house as originally built, a later extension may improve the accommodation without bringing the property within the conversion threshold.

At Gould Road, Hounslow (6008707, dismissed 22 September 2026), Hounslow Council refused the conversion of a family house into an eight-person HMO because the location did not meet its requirements for access to public transport and town-centre facilities. The owner appealed, pointing to nearby shops and bus connections.

The Inspector agreed with the council’s accessibility objection. The property had a Public Transport Accessibility Level, or PTAL, of 1b against the guidance’s expectation of at least 4, and lay about 1.4 km from the nearest qualifying town centre rather than within 400 metres. Nearby shops and the limited evidence of bus services did not overcome those shortcomings.

The appeal was dismissed because the location would leave residents more reliant on private cars. The acceptable room sizes, shared facilities and other arrangements did not outweigh the locational harm identified by the council and upheld by the Inspector.

At Elsenham Street, Wandsworth (6005855, dismissed 7 September 2026), Wandsworth Council refused an eight-person HMO over public transport accessibility, the loss of family housing and a top-floor bedroom’s daylight and outlook. The council had assessed the property as a family dwelling, but evidence at appeal established that a lawful six-person HMO was operating there.

The Inspector did not uphold the family-housing objection because the proposal would intensify an existing HMO rather than remove a family home. Although the bedroom had poor outlook, its continued lawful use provided a fallback and the proposed intensification would not worsen its living conditions.

The Inspector nevertheless agreed with the council on accessibility: the site’s PTAL of 3 fell below the policy’s minimum of 4, and a nearby Underground station did not justify departing from that requirement. The appeal was dismissed on that remaining ground. Successfully challenging the family-housing and bedroom objections had narrowed the dispute, but had not overcome the decisive refusal reason.

Begin by checking the measurements, evidence and policy interpretation behind the refusal. A wrong starting use or an unsupported concentration assessment can change the conclusion on an issue. Material considerations may also justify a departure from policy, as Finchley Lane demonstrates.

Where the property clearly fails an applicable location or original-floor-area test, ask your planning adviser what evidence could justify proceeding. If there is no convincing response, a different occupancy, use or site may offer a stronger opportunity than further changes to an otherwise satisfactory layout.

Even where bedrooms and shared facilities work well, the council needs to understand how the rest of the proposal will function. An extension can damage a neighbouring room, a rear store can be inaccessible, and an unresolved safety question can prevent permission. These matters need to inform the drawings before submission.

Greenwich Council’s refusal of the four-person Aldeburgh Street proposal introduced earlier also addressed its extension. Although the depth stayed within the design guide’s typical allowance, the council considered the design and siting unsympathetic to the house and terrace. Compliance with one dimension did not overcome that refusal reason.

Use existing and proposed elevations, sections through affected windows and contextual views to establish the effect, then revise the form where needed. Heritage constraints require their own assessment and, for works affecting a listed building’s special character, listed building consent.

At Lytton Avenue, Enfield (6009970, dismissed 2 September 2026), Enfield Council refused a proposal involving adjoining houses arranged as separate four- and five-bedroom HMOs, citing inadequate communal living space. The owner appealed, and the Inspector did not accept that the council’s floorspace calculations established an inadequate amount of accommodation. The kitchen-dining area in No. 1 was considered sufficient for five residents, an occupancy limit that could have been conditioned.

The appeal nevertheless exposed a different aspect of accommodation quality. The kitchens lacked openable windows, and the evidence did not demonstrate that mechanical ventilation would adequately address condensation, odour and air quality during shared cooking.

The Inspector dismissed the appeal on those quality concerns and declined to leave the remedy to conditions because it might require external changes. The council’s conclusion that the accommodation was unacceptable therefore stood, but the Inspector’s reasoning focused on ventilation and healthy living conditions rather than simply endorsing its space calculations.

Greenwich Council included cycle access as a separate reason for refusing Aldeburgh Street. Four spaces were shown, but the route to them passed through a narrow hallway, several doors and the kitchen. The council’s objection concerned whether residents could conveniently use the provision, rather than whether four symbols appeared on a plan.

At Bournewood Road, where the owner appealed Bromley Council’s refusal, the Inspector likewise found that bicycle movements through an already cramped communal kitchen reinforced the accommodation concerns. In both cases, the store needed to be assessed together with the route serving it.

Show the full route from the street, including door widths and turns. Your architect can test side access or secure, covered front storage, drawing any screening and external changes in elevation. The plans should demonstrate that residents can use the store conveniently as well as showing the required number of spaces.

Waste storage needs the same attention. Show capacity, collection arrangements and access for residents and collectors. Further details may be secured by condition where sufficient space and workable access are established. A store that blocks the entrance or an escape route requires a different arrangement.

At Chatsworth Road, Croydon (6010588, dismissed 8 October 2026), the owner appealed because Croydon Council had not determined a proposal for a six-bedroom, six-person HMO within the prescribed period. There was no council refusal to overturn. In its appeal statement, the council said it would have granted permission subject to conditions, including a requirement concerning a legal agreement to secure permit-free occupation. The owner disputed the need for that arrangement.

The Inspector accepted that the parking survey did not demonstrate unacceptable parking stress, but agreed with the council that sustainable transport policies required future residents to be excluded from residents’ parking permits. The proposed means of securing that exclusion were not adequate. The Inspector therefore dismissed the non-determination appeal and refused permission, despite the council’s stated willingness to approve a properly secured scheme.

The proposed conditions left important questions unresolved. Changing permit eligibility depended on a separate traffic-order process, and the necessary arrangements and funding had not been properly secured. A condition requiring a legal agreement later was also unacceptable in the circumstances.

At Sunny Gardens Road, the owner also sought to overcome Barnet Council’s parking objection through a signed undertaking that residents would not apply for permits. The Inspector found that it did not secure the necessary traffic-order amendment or its funding. That failed to overcome the parking concern and, alongside the location and housing objections discussed earlier, led to dismissal.

Agree the mechanism with the council’s planning and highways teams before submission. It may involve a traffic-order amendment, funding and a legal agreement. A parking survey assesses likely parking effects; it does not itself change eligibility for permits or secure compliance with sustainable transport policies.

Flood risk can prevent approval even where the use and much of the layout are otherwise acceptable. The assessment needs to demonstrate that people will be safe in the proposed building, including where bedrooms are placed.

Greenwich Council’s refusal at Aldeburgh Street also followed an Environment Agency objection to the flood-risk evidence. The four-person HMO would include ground-floor sleeping accommodation in Flood Zone 3 behind the Thames defences, but the assessment did not provide the modelled breach levels and finished floor levels needed to establish safety.

The council therefore refused permission in part because flood safety had not been demonstrated, alongside its design, accommodation and cycle-access objections. The existence of flood defences did not remove the need to assess the consequences of a breach.

Obtain the relevant flood data early enough for it to inform the design. Floor levels, bedroom positions and safe access need to work with the flood strategy. The findings may support the layout or require changes, such as moving sleeping accommodation upstairs. Establish what is feasible before preparing the final submission.

At Hawthorn Road, Enfield (6010207, dismissed 29 September 2026), Enfield Council refused the conversion of a family house into a three-bedroom HMO for four people. The owner’s appeal concerned poor daylight and outlook in the communal accommodation and the adequacy of the fire-safety arrangements.

Bedroom 1’s route to the front door passed through the communal living room, directly off the kitchen. A fire in that space could compromise the escape route.

The proposed alternative was escape through the bedroom window. The appeal assessment found that this would not provide a suitable route for all residents, including people with different mobility or physical capabilities. It also found the communal living room too dependent on borrowed light, with poor outlook.

The Inspector accepted those findings and dismissed the appeal, leaving the council’s refusal in place because the accommodation and escape arrangements remained unacceptable. An existing HMO licence did not resolve those planning concerns.

Your architect should coordinate the layout with competent fire advice and show escape routes clearly. Moving a bedroom or changing a room’s use may be necessary. Where the basic route remains unresolved, a condition requiring a later report can leave a fundamental design question unanswered.

Planning, licensing and Building Regulations assess different requirements. Coordinate them before fixing the layout, so a solution developed for one regime does not create a problem under another.

A refusal does not necessarily mean an HMO cannot work at your property. The next step is to understand whether the objections call for a better proposal, stronger evidence or a challenge to the council’s assessment.

Start by reviewing the decision notice and officer’s report with your architect or planning consultant. They should explain what led to refusal, whether the reasoning is sound and what would need to change for a different outcome. Addressing one prominent objection may still leave another capable of defeating the scheme.

If you are left without a clear way forward, consider a second opinion from a practice experienced in securing planning permission for an HMO. A fresh assessment can help you decide whether to defend the proposal or reconsider its layout, occupancy or use before committing further money.

That assessment should guide your choice of route. Where the scheme needs a better layout, fewer residents or additional technical evidence, a revised application may offer the clearest opportunity. Your design and planning team can develop the changes together and demonstrate how they answer the refusal reasons.

An appeal may be appropriate where the submitted design and evidence already support the proposal, but the disagreement concerns the council’s planning judgement or interpretation of policy. Before proceeding, ask your adviser to explain the strongest arguments, the weaknesses and whether every decisive refusal reason can be answered.

The appeal procedure also matters. For applications submitted on or after 1 April 2026, written planning appeals against refusal normally follow the Part 1 procedure, which generally prevents appellants from introducing new evidence or amended plans. Written appeals against non-determination follow Part 2. Your adviser should confirm the applicable procedure and its restrictions before recommending an appeal for a scheme that still needs work.

Confirm the deadline while considering these options. An appeal against refusal of an HMO change of use normally must be submitted within six months of the decision notice, while enforcement-related cases can have much shorter deadlines. Establishing this early gives you and your advisers time to choose and prepare the most appropriate response.

A refused HMO application can leave you wondering whether to challenge the decision, rethink the layout or abandon the proposal. Understanding why permission was refused is the first step towards deciding where your project can go next.

With more than 900 completed projects in our portfolio, our experience spans a wide range of property conversions and planning challenges. As chartered architects and town planners, we bring planning judgement and design expertise together, examining the council’s reasons alongside what your building can realistically accommodate.

Through an architectural feasibility assessment, we explore how a better layout, stronger evidence or a different occupancy could address the objections. We then advise whether an appeal or a revised application offers the stronger route, helping you make an informed decision before committing further money.

If you are looking for specialist HMO architects who understand both the planning requirements and the qualities that make shared accommodation a good place to live, we would welcome a conversation. Our approach suits owners prepared to invest in thoughtful design and a well-supported planning case, with a clear understanding of the opportunities and limitations of their property.

We do not take on projects that rely on cramped bedrooms or squeezing homes into unsuitable spaces. Whether designing an HMO or self-contained flats, we believe every resident deserves a comfortable home with adequate space, natural light and privacy.

This article presents research assembled by Urbanist Architecture through a combined architecture and town planning lens. It examines why London HMO proposals fail and when design, evidence or a different proposal can address the objection.

The findings draw on 33 London HMO appeal decisions issued between 17 August and 15 October 2026, alongside the council decisions discussed in the article. They describe a selected group of cases, not the refusal rate for London HMO applications or a forecast for an individual property.

The methodology and findings should be attributed to Urbanist Architecture. Links remain alongside the relevant examples so readers can examine the source decisions and their qualifications.

PRESS ENQUIRIES: media@urbanistarchitecture.co.uk

The research distinguished objections raised during an appeal from harm the Inspector accepted and reasons that actually justified dismissal. Each London decision was assessed against four overlapping themes: residents’ living conditions; neighbours’ living conditions; location, family housing, concentration or need; and practical or external matters.

There is no single NPPF eligibility test for an HMO. The relevant national policies must be considered alongside the development plan and the facts of the proposal. The appeal period was selected to examine early decisions following publication of the NPPF 2026; a decision’s date alone does not establish which national policy determined its outcome.

An initial review on 18 October 2026 identified 157 decisions in England mentioning HMOs. Screening for section 78 appeals proposing HMO creation, enlargement, intensification or alteration left 97 decisions, of which 33 concerned London. Certificate, enforcement and heritage appeals, proposals removing HMOs and incidental mentions were excluded. Both alternative Lytton Avenue schemes were counted as separate decisions.

Of the 33 London appeals, 23 were dismissed and 10 allowed. Residents’ living conditions were a main issue in 16, with harm found in 11 and decisive in 10. Neighbours’ living conditions were a main issue in 14, with harm found in seven and decisive in six. Location, family housing, concentration or need featured in 21, with harm found in 12 and decisive in 11. Practical matters featured in 11, with harm found in six and decisive in five; conditions resolved the issue in two others.

The findings are attributed to the Inspector’s reasoning in each appeal decision. Council examples are identified separately as application decisions, rather than appeal outcomes. The article links to Planning Inspectorate records or published decisions, council planning records and relevant national guidance. This appeal sample is Urbanist Architecture’s research, not an official government statistical series.

Classifying an issue as harmful or decisive involves judgement, and an Inspector’s main issues may combine several council refusal reasons. Themes overlap, so the totals cannot be added together or treated as a ranking of all London refusals. Appeal decisions are fact-specific and do not create binding precedents.

The review covers the policy, design and evidence issues identified in the selected decisions. Flood risk was not decisive in the London appeal sample; its inclusion draws on the Aldeburgh Street council decision. The examples do not amount to a complete assessment of every site constraint or every licensing, building regulations or fire-safety requirement.

A property-specific assessment must establish lawful use, the applicable Article 4 direction and borough policies, then test the layout, neighbouring relationships and technical constraints.