What to Do If Your London Extension Planning Application Is Refused

A planning refusal from a London Borough will arrive as a formal decision notice listing the reasons for refusal. Reading and understanding the refusal reasons is the essential first step before deciding what to do next. Refusal notices typically include: the name of the London Borough local planning authority (LPA); the application reference number; the description of the proposed development; the decision (refused); and a numbered list of reasons for refusal — each referencing a specific planning policy (typically the London Borough's Local Plan policy, the London Plan policy, or the National Planning Policy Framework (NPPF)). Common reasons for refusal of London extension planning applications: Harm to the character and appearance of the streetscape: the extension is too large, too prominent, or uses materials that are inconsistent with the surrounding properties. Overbearing impact on neighbouring properties: the extension is too tall, too close to the boundary, or creates an unacceptable sense of enclosure or loss of light for the neighbouring occupiers. Loss of daylight or sunlight to neighbouring windows: the extension blocks daylight or direct sunlight to the windows of a neighbouring property below the BRE (Building Research Establishment) daylight/sunlight standard. Conflict with conservation area character: the extension's form, materials, or massing is not appropriate for the surrounding conservation area. Loss of garden space: the extension leaves insufficient private amenity space for future occupants. Harm to the setting of a listed building: the extension compromises the character of a listed building or its setting. Policy conflict: the extension conflicts with specific development management policies in the Borough's Local Plan (for example, a policy protecting garden land, or a policy limiting extensions to a specific proportion of the original floorspace). Each reason for refusal should reference a specific policy — this is important because it tells you exactly what design change would be needed to address that reason.

For many London homeowners, redesigning the extension to address the reasons for refusal and re-applying is the most effective route forward. This approach is particularly effective where the refusal reasons are specific and addressable by changes to the design. How to approach the redesign for a re-application: Read each refusal reason carefully and identify the specific design change that would address it: if refused for overbearing impact — consider reducing the height, setting the extension back from the boundary, or stepping down the rear of the roof; if refused for loss of light — engage a daylight/sunlight consultant to test a revised design against the BRE standard before re-applying; if refused for materials inconsistency — specify materials that match or complement the existing property (matching brickwork, timber frames consistent with the period character); if refused for conservation area conflict — consult the Borough's conservation area appraisal and any specific conservation area guidance. Request a pre-application meeting with the planning officer: after a refusal, a pre-application meeting with the case officer or their team to discuss what changes would be acceptable is extremely valuable. Most London Boroughs offer pre-application advice services (at a fee — typically £75-£300 for a householder pre-application). This gives a steer on the likely acceptable design parameters before a full re-application is submitted. Engage an experienced planning consultant or architect: a planning consultant or architect who is familiar with the specific London Borough's policies and planning culture will be better placed to redesign the scheme to address the refusal reasons. Re-application fees: where a re-application is made within 12 months of a refused application for a similar development on the same site, the planning application fee (currently £528 for a householder application in England) is not payable on the re-application — the first re-application is free.

If redesigning the scheme is not possible or desirable (for example, if the homeowner believes the refusal was wrong and the original scheme should have been approved), a planning appeal against the refusal is the alternative route. How a planning appeal works in London: the planning appeal is submitted to the Planning Inspectorate (PINS) — an independent government body — rather than to the London Borough. The Planning Inspectorate appoints an independent planning inspector to consider the appeal. The inspector considers: the planning merits of the refused scheme against the relevant planning policies; the London Borough's reasons for refusal; the appellant's grounds of appeal and any supporting evidence. Planning appeal procedures: Written representations: the most common and fastest procedure for householder planning appeals — both the appellant and the London Borough submit written statements, and the inspector decides on the papers without a hearing. Site visit is conducted. Decision typically within 6-12 months of the appeal being submitted. Hearing: less common for householder appeals — appropriate where there is a factual dispute that is best aired in a discussion. Decision typically within 6-12 months. Costs and likelihood of success: Planning Inspector appeal decisions for householder applications nationally: approximately 35%-40% of householder planning appeals in England are allowed (the refusal is overturned) by the Planning Inspectorate. Costs of an appeal: an independent planning consultant to prepare and manage a written representations appeal: £1,500-£4,000. The fee for the appeal itself is free (no charge to the appellant). The London Borough does not charge for the appeal process. The risk of a costs award against the appellant (if the appeal is found to be frivolous or unreasonable) is low for a straightforward householder appeal. Timeline: allow 6-15 months from appeal submission to a decision for a written representations householder appeal. This is a significant time commitment — most London homeowners prefer to redesign and re-apply rather than appeal, unless the original scheme was straightforwardly compliant and the refusal was incorrectly made.

In some cases, a planning refusal for a full planning application may be followed by the discovery that a permitted development (PD) scheme is available — allowing a smaller or differently designed extension without the need for planning permission. When PD is worth revisiting after a refusal: if the refused scheme was larger than the PD limits (a 4m deep rear extension refused for overbearing impact — the PD limit is 3m for a mid-terrace without prior approval); if the refusal was in a conservation area or other area where PD rights have been partially removed by Article 4 Directions (the PD route for some elements may still be available where Article 4 Directions do not remove the specific right). Lawful Development Certificate (LDC): before proceeding with a PD scheme, confirm the position by applying for a Lawful Development Certificate from the London Borough. The LDC is a formal confirmation (not planning permission) that the proposed development is lawful and does not require planning permission. Cost: LDC application fee (currently £258 for a householder LDC in England). Prior approval under Householder Prior Approval Scheme: for single-storey rear extensions up to 6m deep (3m for mid-terrace) on detached houses, and up to 8m (4m mid-terrace), a prior approval application under the larger home extension scheme is required. The London Borough consults neighbours and assesses only the impact on neighbours (not the general planning merits) — if no valid objections are received within 42 days, the prior approval is granted (or deemed granted).

After a planning refusal for a London extension, the most important step is to seek qualified expert help before spending further money on a re-application or an appeal. Where to get expert help: Planning consultant (chartered town planner): a chartered town planner (RTPI-qualified) can assess the refusal reasons, advise on the prospects of a re-application or appeal, prepare and manage the re-application or appeal, and engage with the London Borough's planning officers on behalf of the homeowner. For a householder planning appeal: £1,500-£4,000. For a re-application with advice and management: £1,000-£3,000. Architect or architectural designer: an architect or architectural designer can redesign the scheme to address the refusal reasons, draw up revised plans, and prepare the amended planning application documents. For a revised householder planning application after a refusal: design and drawing fees of £1,500-£5,000. The Planning Portal's appeal service (PlanningPortal.co.uk): householder planning appeals are submitted through the Planning Portal. The submission is straightforward but requires clear, well-organised documentation. Seek qualified advice before submitting a self-prepared appeal — a poorly organised appeal may not present the strongest case. The Royal Institution of Chartered Surveyors (RICS) and Royal Town Planning Institute (RTPI) maintain member directories that can be used to find qualified planning consultants in London. RCB Design & Build: as a design-and-build principal contractor with strong pre-construction awareness, RCB helps clients with redesign strategies after planning refusals — coordinating revised designs with architects and preparing better-informed applications that address the specific London Borough's concerns.