Planning Appeals in London 2025: What to Do When Your Extension or Loft Conversion Is Refused

**The first decision after a planning refusal: appeal or reapply?**

A planning refusal in London gives you two main options: (1) submit an appeal to the Planning Inspectorate; or (2) submit a revised planning application to the same London Borough (LPA). The right choice depends on the specific grounds of the refusal and the advice of your planning consultant or architect.

*When reapplication is usually better than an appeal*:

• •**The refusal is on design grounds and the officer has indicated what changes would be acceptable**: if the planning officer's refusal report says 'the proposed extension would be acceptable if the depth were reduced from 5m to 4m' or 'if the rear dormer were set back 500mm from the eaves', the fastest route to planning permission is often to revise the design accordingly and reapply. A revised application (reapplication free of charge within 12 months of the original householder decision in England — check current eligibility) saves 8–20 weeks of appeal time
• •**The scheme has a genuine design weakness that caused a reasonable refusal**: if, on reflection, the officer's assessment of harm (over-development; loss of amenity; conflict with local character) has merit, redesigning to address it is more productive than arguing the original design was acceptable
• •**Speed is the priority**: a planning appeal takes 8–20 weeks minimum; a reapplication with revised drawings can be validated and determined in 8 weeks (householder application target). Where the homeowner is time-pressured (a sale; a tenant moving in; a construction season), reapplication is often faster
• •**The pre-application advice suggested the design needed revision**: if the Borough's pre-application advice had already flagged concerns that the refused application did not fully address, revisiting those concerns with the officer before reapplying is the better route

*When an appeal is the better option*:

• •**The refusal misapplies planning policy**: where the officer has refused the application based on an incorrect reading of the Local Plan policy; or has given excessive weight to a policy consideration that the development plan does not support; an appeal allows an independent inspector to assess the merits. The appeal inspector is not bound by the LPA's interpretation of policy
• •**The refusal contradicts a recent appeal inspector decision on a nearby or very similar case**: planning appeal decisions set precedent, particularly where the facts are very similar (same conservation area; same street; same property type; same scale of extension). Where a neighbour received appeal approval for an almost identical scheme, an appeal on the same grounds has a strong foundation
• •**The officer has given undue weight to neighbour objections**: planning decisions must be based on planning policy, not on the number or strength of objections from neighbours. Where the refusal report reads as if it is primarily motivated by neighbour pressure rather than planning policy, an appeal inspector is well-placed to recalibrate this
• •**A Lawful Development Certificate (LDC) has been incorrectly refused**: where the LPA has refused to certify that works are permitted development when (in the applicant's view) they clearly meet the permitted development criteria, a Section 195 appeal to PINS is the correct mechanism — and the inspector applies a purely legal test (do the works meet the PD criteria?) rather than a planning merits test
• •**The LPA refused due to a conservation area or listed building character argument that is not supported by the conservation area appraisal**: conservation areas have appraisals that identify which features make a positive contribution to the area's character. Where the refusal relies on harm to character that is not identified as significant in the area's own appraisal, the appeal has a stronger chance of success

**Pre-appeal steps — the most important planning discipline**:

*Read the decision notice and officer's report carefully*: the decision notice gives the reasons for refusal — these are the grounds on which the appeal must be argued. The planning officer's report (Committee Report or Delegated Report) sets out the officer's full reasoning. Both documents are available on the LPA's planning portal.

*Commission a planning consultant or architect to assess the appeal prospects*: an experienced planning consultant in London will review the refusal, the relevant Local Plan policies, recent appeal decisions on similar cases (searchable via the Planning Inspectorate's appeals database at acp.planninginspectorate.gov.uk), and the conservation area appraisal if relevant. A brief appeal prospects assessment costs £200–£400 and can save the homeowner spending £1,000–£2,000 on an appeal that is unlikely to succeed.

**Section 78 of the Town and Country Planning Act 1990 — the legal basis for planning appeals**:

• Section 78 of the TCPA 1990 gives any applicant the right to appeal to the Secretary of State (in practice, to the Planning Inspectorate — PINS) against:
• •A refusal of planning permission
• •A conditional grant of permission (where the conditions are considered unreasonable)
• •Non-determination (where the LPA has not made a decision within the statutory determination period — 8 weeks for householder applications)

Appeals are decided by a Planning Inspector appointed by the Secretary of State — an independent government official with planning expertise. The inspector is not an employee of the LPA and is not bound by the LPA's decision.

**Three appeal procedures under Section 78**:

1. **Written Representations** (the most common for London householder applications): - All parties submit written statements; the inspector determines on the papers without a hearing - The appellant's Written Representations statement sets out why the decision was wrong in planning law/policy; the LPA's Written Representations statement defends its decision; third parties (neighbours) may also submit representations - The inspector typically carries out an **unaccompanied site visit** (visiting the property and surroundings without the parties present; to assess the planning context for themselves) - Processing time: approximately **8–20 weeks** from validation of the appeal to the inspector's decision - Most appropriate for: factual disputes about the application of PD criteria (LDC appeals); design disputes where the drawings speak for themselves; straightforward policy misapplication arguments

2. **Hearing**: - An informal hearing at a venue (typically the LPA's offices or a local venue) where the inspector conducts a round-table discussion with the parties - More appropriate where the planning issues are complex or where there are points of fact and argument that benefit from discussion rather than written-only exchange - Processing time: typically 20–30 weeks from appeal start to decision

3. **Inquiry**: - A formal hearing with legal representation, cross-examination of witnesses, and a full legal procedure - Appropriate for major planning decisions; not typically used for householder applications - Very rarely used for London residential extensions or loft conversions

**The Written Representations process in detail — what the appellant must do**:

• *Step 1 — Submit the appeal within the time limit*:
• •The time limit for a Section 78 householder appeal in England is **12 weeks** from the date of the planning decision (or from the expiry of the determination period for non-determination appeals)
• •Appeals are submitted online via the Planning Inspectorate's portal (acp.planninginspectorate.gov.uk)
• •The appeal form asks for: the application reference; the decision notice; the appellant's grounds of appeal; and whether Written Representations; Hearing; or Inquiry is requested

• *Step 2 — The Inspectorate validates the appeal*:
• •PINS checks that the appeal has been submitted correctly and within time; notifies the LPA; notifies any statutory consultees
• •The LPA and the appellant are given a date by which their Written Representations must be submitted (typically 5–6 weeks from appeal start date)

• *Step 3 — Written Representations submitted*:
• •The appellant submits their grounds of appeal statement in full (a structured argument setting out why the planning inspector should allow the appeal and grant permission)
• •The LPA submits its defence of the decision (defending the refusal reasons)
• •Third party representations (neighbours) submitted within the same window

• *Step 4 — Optional comments on representations*:
• •Both parties are given a further 2 weeks to comment on the other party's representations (a brief 'comments' stage)

• *Step 5 — Unaccompanied site visit*:
• •The inspector visits the site and the surrounding area independently — no parties present
• •The inspector observes the site context, neighbouring properties, streetscene, and any features relevant to the appeal issues

• *Step 6 — Inspector's decision*:
• •The inspector issues a decision letter (typically 2–8 pages) explaining the inspector's assessment of the planning issues, the conclusion, and the outcome: **ALLOWED** (planning permission granted; LPA's refusal overturned) or **DISMISSED** (refusal upheld)
• •Decision is published on the PINS website and on the LPA's planning portal
• •There is no further right of appeal on planning merits; judicial review (appeal on a point of law) is possible within 6 weeks of the decision, but is limited to legal errors in the inspector's reasoning

**Planning appeal success rates for London householder applications**:

*National statistics*: approximately 30–35% of all householder planning appeals are ALLOWED (refusal overturned) nationally, as of 2024/25 PINS data.

• *London context*: success rates in London vary by Borough and by appeal type:
• •Appeals against refusals in highly restrictive conservation areas (particularly RBKC; Westminster; Camden; Islington) have lower success rates — approximately 25–30% for design-based conservation area refusals
• •Appeals where the LPA misapplied the PD criteria (Section 195 LDC appeals) tend to have higher success rates where the PD case is strong — because the test is purely legal
• •Appeals where a near-identical scheme was recently approved on appeal nearby are significantly more likely to succeed

• *What improves appeal prospects*:
• •A strong, well-reasoned Written Representations statement from a planning consultant with London householder appeal experience
• •Supporting evidence: photos of the locality showing comparable development; relevant Local Plan policies cited correctly; recent appeal decisions at comparable sites
• •A site visit report from an architect or designer demonstrating that the proposal is contextually appropriate
• •Precedent from recent decisions on nearby properties or in the same conservation area

**Section 195 appeal — against refusal of a Lawful Development Certificate (LDC)**:

Where the LPA has refused to certify that proposed works are permitted development (by refusing a Lawful Development Certificate application), the applicant can appeal under Section 195 TCPA 1990. The Section 195 appeal to PINS tests whether the works are lawfully PD — a purely legal question, not a planning merits question. If the inspector determines the works are PD, a Certificate of Lawfulness is issued (equivalent to planning permission for the purpose of the specific works).

• Section 195 appeals are particularly relevant where:
• •The LPA has incorrectly applied the GPDO criteria to refuse a Velux rooflight LDC; or a rear extension LDC; or an outbuilding LDC
• •The permitted development case is clear and the LPA's refusal appears to be motivated by policy preference (opposition to the works) rather than a genuine legal assessment of the PD criteria

**The most effective grounds for London householder planning appeals**:

A well-drafted Written Representations statement for a London householder appeal identifies the specific grounds on which the refusal was wrong in planning law or policy. The strongest grounds are:

*1. The development accords with the development plan*:

• Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires that planning applications be determined 'in accordance with the development plan unless material considerations indicate otherwise'. The development plan in London comprises:
• •The London Plan (the Mayor of London's strategic plan for London — 2021; GLA)
• •The relevant London Borough's Local Plan (the Borough-specific policies on design; housing; amenity; conservation; etc.)
• •Any Supplementary Planning Documents (SPDs) adopted by the Borough

Where the proposed development accords with all the relevant development plan policies, the presumption is in favour of granting permission. If the LPA has refused against a scheme that is consistent with development plan policy, the inspector is likely to consider this a significant error and allow the appeal.

*2. The harm identified in the refusal is not real or significant*:

• Many London householder refusals are based on asserted harm: 'the extension would cause demonstrable harm to the character and appearance of the conservation area'; 'the extension would cause loss of daylight to the neighbouring property'; 'the proposed dormer would be an incongruous addition to the roofscape'. The appeal grounds can challenge whether the alleged harm is:
• •**Real**: is the harm actually visible or experienced? Does the extension affect any neighbouring amenity or public viewpoint in practice?
• •**Significant**: even if some harm exists, does it reach the threshold for refusal? Planning requires harm to be 'significant' (for householder applications, the test is typically whether the development would 'materially harm' the amenity or character — not whether it causes any departure from the original)
• •**Consistent**: if similar development nearby has been approved (by the LPA or on appeal), is the LPA's assessment of harm consistent?

*3. The weight given to neighbour objections was excessive*:

Neighbour objections are a material consideration in planning decisions — but they are not determinative. The number of objections does not decide the outcome. An inspector reviewing a refusal that appears to have been primarily driven by pressure from objectors (rather than by policy analysis) will scrutinise whether the refusal reasons reflect genuine planning policy grounds or are post-hoc justifications for a politically motivated decision. Where the officer's report reads as if neighbour sentiment has driven the recommendation, the appeal statement should clearly separate the planning policy arguments from the neighbour sentiment.

*4. Recent appeal decisions set a clear precedent*:

The Planning Inspectorate publishes all appeal decisions at acp.planninginspectorate.gov.uk. Where a very similar extension (same street; same conservation area; same scale and design) was allowed on appeal in the last 3–5 years, the inspector hearing a new appeal will give significant weight to the consistency argument. Search the PINS database by local planning authority (Borough), address range (postcode), and approximate decision date.

*5. The LPA's conservation area reasons are not supported by the conservation area appraisal*:

Every London conservation area has an adopted Conservation Area Appraisal and Management Plan — a document that identifies the positive contributors to the area's character; the negative features; and the management policies. Where the LPA's refusal grounds cite harm to 'the character and appearance of the conservation area', the appeal grounds should engage with the specific appraisal — demonstrating that the proposed development does not harm the specific features identified as positive contributors to the area's character, or that the view affected is not one identified as an important view in the appraisal.

**Costs of a London planning appeal (2025)**:

| Route | Cost | |---|---| | Appeal fee to Planning Inspectorate (Section 78 or Section 195) | **Free** (no PINS appeal fee for householder appeals) | | DIY Written Representations (self-prepared) | £0 professional fees; risk of weak argument; not recommended for conservation area appeals | | Planning consultant to prepare Written Representations statement (straightforward PD / policy case) | £800–£1,500 | | Planning consultant + heritage consultant for conservation area appeal | £1,500–£3,000 | | Planning consultant for complex multi-ground appeal | £2,000–£4,000 | | Daylight/sunlight consultant report (where amenity harm is a key ground) | £800–£2,000 | | Expert witness at a Hearing (rare for householder) | £2,000–£5,000 | | **Typical London householder Written Representations appeal total (planning consultant; standard case)** | **£800–£2,500** | | **Typical timeline (Written Representations; householder)** | **8–20 weeks from validation to decision** |

**What happens if the appeal is dismissed — can you reapply?**:

Yes — a dismissed appeal does not prevent reapplication. You can reapply at any time with a revised scheme. However, a dismissed appeal and its decision letter form part of the planning history of the site — future decision-makers (LPA officers; future inspectors) will be aware of the previous refusal and dismissed appeal. Where the inspector's decision letter makes clear points about why the scheme failed, a future application must address those points or it will likely fail again on the same grounds.

**The pre-application advice option after a refusal — before appealing or reapplying**:

Many London Boroughs offer pre-application advice — a formal consultation with the planning officer before a new application is submitted. Cost: typically £150–£400 for a householder application. Where the refusal was on design grounds and there is uncertainty about what changes would make a new application acceptable, pre-application advice is a worthwhile investment. The officer's pre-application advice letter (written response) gives a clear indication of what the LPA will accept — and if a revised application is then submitted that follows the pre-application advice, refusal on the same grounds is significantly harder to sustain (a change of mind by the LPA after giving positive pre-application advice is a material consideration that can itself support an appeal).