How to Improve Your Chances of Planning Permission in London: 12 Practical Tips

**Tip 1: Use the pre-application advice service before you submit**

Every London Borough offers a pre-application advice service where the planning officer reviews your proposals informally before you submit a full application. The officer will tell you what they are likely to support, what concerns they have, and what changes would make the application more likely to succeed.

• Costs vary by Borough and scheme type:
• •Householder pre-application advice (extensions): typically £150–£500 per application
• •More complex schemes (conversions; commercial; change of use): £500–£2,500+

The pre-application advice letter is not a decision — it is not legally binding. However, if the officer gives a positive pre-application response and you submit an application that matches those proposals, the officer has effectively pre-committed to a recommendation for approval unless material facts change. This dramatically reduces the risk of refusal.

For complex or borderline projects in conservation areas, listed buildings, or sensitive locations, pre-application advice is not optional — it is essential. The cost of pre-application advice (£150–£500) is insignificant compared to the cost of a refused application, redesign, and resubmission.

**Tip 2: Commission a specialist planning architect — not a general building designer**

• Planning architecture and building design are different skills. A planning architect understands:
• •The Local Plan policies and supplementary planning documents for the specific London Borough
• •The character of the area and what design language is likely to be acceptable
• •How to draw up plans that present the project in the best light
• •How to write a Design and Access Statement that pre-empts the officer's likely concerns
• •When to depart from a client's initial preference because it is likely to be refused

For a London residential extension in a sensitive location (conservation area; near a listed building; on a prominent corner site), commissioning a planning architect with specific local knowledge of the Borough is strongly recommended. The planning fee (£258 for householder applications from April 2024) is trivial — the time and cost of a refused application, redesign, and resubmission is not.

**Tip 3: Study the LPA's design guidance before drawing anything**

• Most London Boroughs publish supplementary planning documents (SPDs) or design guidance notes that explain what is and is not acceptable in their area:
• •Residential Design Standards SPD: sets out policies on scale, massing, materials, windows, roof forms
• •Conservation Area Character Appraisals: define what makes each conservation area special and what to protect
• •Tall Buildings SPD: policies on building heights and massing
• •Local Design Codes (under the National Model Design Code / NPPF 2021 requirement)

Download and read the relevant guidance before commissioning drawings. If the LPA says in their design guidance 'we do not support flat-roofed side extensions on Victorian semi-detached houses in this area', designing a flat-roofed side extension and submitting it for planning is a near-certain refusal.

**Tip 4: Demonstrate 'positive relationship to context' in the design**

• London planning officers use the concept of 'character' constantly. An extension, conversion, or alteration that is 'in keeping with the character of the area' is likely to be approved; one that 'fails to respect the character of the area' is likely to be refused. The character test includes:
• •*Scale and massing*: is the new addition proportionate to the host building and surrounding properties?
• •*Roof form*: does the roof pitch, form, and height match the surrounding buildings?
• •*Materials*: are the proposed materials (brick, render, stone, slate, tile) in keeping with the palette of the surrounding area?
• •*Windows and doors*: are the proportions of the openings in character with the host building and neighbours?
• •*Position on the plot*: does the extension respect the established building line and garden pattern?

A detailed character assessment in the Design and Access Statement, showing that you understand the context and have specifically responded to it in the design, gives the planning officer the material they need to support an approval.

**Tip 5: Address the 'main harms' before the officer identifies them**

A planning officer considering a London householder extension application is looking for harms — impacts on neighbours (loss of light, overlooking, overbearing), impacts on the street scene, impacts on the conservation area. If your application proactively addresses the main harms — explaining why they are not significant, or showing how the design minimises them — the officer's task is made easier and they are less likely to reach for a refusal reason.

• Common harms in London residential planning applications and how to pre-empt them:
• •*Loss of light to neighbours' windows*: undertake a BRE daylight/sunlight impact assessment (£500–£1,500) for sensitive schemes; present the results in the Design and Access Statement
• •*Overlooking into neighbouring gardens*: show obscure glazing on side windows; note fence/hedge screen heights; show that the height and angle of any new windows does not create a new line of sight into private amenity space
• •*Overbearing impact*: compare the proposed extension to the 45° angle test (widely used by London Boroughs as a rule of thumb); if the extension does not break the 45° line from the nearest neighbour's window, state this explicitly
• •*Impact on conservation area character*: reference the specific conservation area character appraisal and show how the materials, design, and details respond to it

**Tip 6: Notify your neighbours before you submit**

• Planning applications in London require statutory consultation with adjoining owners and occupiers — but you do not have to wait for the LPA to do this. Speaking to your immediate neighbours (particularly those whose properties are most affected by the extension) before you submit the application can significantly reduce the number of objections received:
• •Explain what you plan to do
• •Show them the plans
• •Address their concerns where possible (minor adjustments to window positions; confirmation of party wall process)
• •Give them your contact details

A planning objection from a neighbour does not automatically result in refusal — the officer must weigh objections against planning policy. However, a large volume of objections on a residential householder application can cause the officer to recommend refusal or to escalate the decision to a planning committee. One neighbour who is supportive (or at least not objecting) after a pre-submission conversation is better than a notified letter that creates a hostile response.

**Tip 7: Submit the right supporting documents — do not submit an incomplete application**

• A planning application that is incomplete will be held as 'invalid' and the clock does not start on the 8-week determination period until the LPA accepts it as valid. Common reasons for invalidity in London residential applications:
• •Missing existing/proposed floor plans (showing both existing and proposed layout clearly, at the correct scale)
• •Missing existing/proposed elevations (all four elevations of the building, before and after)
• •Missing site location plan (OS-based red line drawing)
• •Missing block plan (1:500 scale site layout showing the property in context)
• •Missing Design and Access Statement (required for applications in conservation areas and most major applications; optional but strongly recommended for all householder applications)
• •Incorrect application fee (fees changed April 2024: householder application £258; prior approval for larger extension £258)

Use the Planning Portal validation checklist for the specific London Borough before submitting. Some Boroughs have additional local requirements (specific forms; additional documents for HMO applications; heritage statements for listed buildings).

**Tip 8: Chase the application at 3 weeks and 5 weeks after validation**

London Boroughs have 8 weeks from the date of valid application to determine householder applications (13 weeks for major applications). Many Boroughs are operating close to or at this statutory timeframe, with officer caseloads often exceeding the recommended level.

• Proactive engagement with the case officer:
• •At 3 weeks after validation: email or call the case officer to ask for their initial view on the application and whether there are any concerns that could be addressed by a minor amendment
• •At 5 weeks after validation: follow up to confirm the timetable for determination and whether a site visit has been scheduled

A planning officer who has made no contact at 6 weeks is a concern — it may mean the application is waiting to be allocated, or that the officer is close to recommending refusal and waiting to issue the refusal rather than engaging with the applicant. Proactive contact at 5–6 weeks can surface concerns that can still be addressed by amendment before the determination is made.

**Tip 9: Be prepared to make minor amendments during the determination process**

• Under Regulation 25 of the Town and Country Planning (Development Management Procedure) (England) Order 2015, applicants can submit minor amendments to a planning application during the determination period without restarting the application process. Minor amendments are typically:
• •Reduction in the scale of an element that the officer has raised a concern about
• •Material changes (different brick type; different cladding)
• •Window position adjustments to reduce overlooking concerns

A planning officer who raises a concern at week 4 of the 8-week determination period is effectively offering an opportunity to fix the problem. The right response is to engage quickly, propose an amendment, and ask the officer to confirm whether the amended scheme would be acceptable. This is far preferable to receiving a refusal and having to resubmit.

**Tip 10: Understand the difference between a delegated decision and a committee decision**

• Most London householder planning applications are decided by the planning officer under delegated powers — the officer makes the decision without it going to a planning committee. The decision to take an application to committee is made by the officer where:
• •The application has attracted significant objections from neighbours
• •The proposal is contrary to planning policy but the officer wishes to recommend approval (unusual; happens when national policy supports the principle but local policy is stricter)
• •The proposal raises issues of principle that the officer does not want to decide alone

If the officer indicates that the application will go to committee, the applicant and their agent have the opportunity to address the committee at the public meeting (typically a 3-minute speaking slot for the applicant; 3 minutes each for objectors). Preparing a clear, concise committee presentation — focusing on policy compliance, neighbour consultation, and public benefit — can influence the committee's decision where the officer's recommendation is borderline.

**Tip 11: If refused, read the refusal reasons carefully — most can be addressed by a redesign and resubmission**

A planning refusal is not the end of the process — it is feedback on what needs to change. The refusal notice sets out the specific reasons for refusal, referencing the planning policies that were not satisfied. Each refusal reason must be read and addressed:

*Refusal for scale*: 'The proposed extension is considered to be excessive in scale in relation to the host dwelling and would cause harm to the character and appearance of the host dwelling and surrounding area.' Addressing this: reduce the scale. Typically this means reducing height, projection, or footprint. Ask the planning officer informally what reduction would be acceptable.

*Refusal for materials*: 'The proposed facing materials are not considered to be in keeping with the character and appearance of the conservation area.' Addressing this: change materials to match the conservation area character. Consult the conservation officer to confirm what materials would be acceptable.

*Refusal for overlooking*: 'The proposed first-floor side window would cause an unacceptable loss of privacy to No. 12 through overlooking of their private amenity space.' Addressing this: specify obscure glazing on the window; or reposition the window; or reduce the window size.

A redesigned application addressing the refusal reasons can be submitted within 12 months of the refusal date without paying a further planning application fee (one free resubmission in England).

**Tip 12: Appeal to the Planning Inspectorate — but only where the grounds are strong**

Where the planning officer's decision is genuinely contrary to planning policy — where the proposal clearly meets the policy tests but has been refused — an appeal to the Planning Inspectorate (PINS) is a legitimate option. Appeals are free to submit; the Inspectorate's inspector reviews the application afresh without being bound by the LPA's decision.

• Appeal timescales:
• •Written representations (most householder appeals): 18–28 weeks
• •Hearing procedure (more complex cases): 28–42 weeks
• •Public inquiry (major or contested applications): 12–24 months+

For London householder extensions, written representations appeals are standard. The appeal success rate for householder applications in England is approximately 35–40% — meaning a refused application with a solid planning case has a meaningful chance of being overturned on appeal.

However, appeals are not appropriate where the refusal is clearly policy-compliant (i.e., the proposal is genuinely contrary to local or national policy). A specialist planning consultant or solicitor can advise on the merits of an appeal within 48 hours of receiving the refusal notice — before the 6-month appeal deadline passes.