Pre-Application Planning Advice in London: How to Use It, What It Costs, and Why It Matters

**What pre-application advice involves**:

• Pre-application advice is a paid service offered by the local planning authority (the London Borough) through which a planning officer reviews your proposed development and provides a written opinion on its planning acceptability before a formal application is submitted. The pre-app service typically includes:
• •A review of the submitted drawings, photographs, and description of the proposed development by the case planning officer
• •A written pre-application response setting out: whether the proposal is considered acceptable in principle; any concerns or objections to the scheme; the specific planning policies or design guidance relevant to the proposal; what information would need to accompany a formal application; and any conditions that may be applied if planning permission is granted
• •In some London Boroughs, the pre-app service also includes a meeting with the planning officer — either an in-person meeting at the council offices, a phone or video call, or a site visit

**When pre-application advice is worth using in London**:

For straightforward permitted development projects (a small rear extension within permitted development limits on an unlisted house not in a conservation area) pre-app advice is not necessary — a Lawful Development Certificate (LDC) application is the appropriate route. Pre-app advice is worth using in the following situations:

*1. Conservation area properties*: For any extension or alteration to a property in a London conservation area, understanding the planning officer's interpretation of the Conservation Area Character Appraisal and the LPA's design guidance is critical. Conservation area decisions can be highly subjective — the pre-app service allows you to test the officer's attitude to the proposal before committing to a full application and fee.

*2. Proposals that push permitted development limits*: If the proposed extension is at or close to the permitted development limits (e.g., a rear extension 3.5m deep from a semi-detached house — at the boundary of the 3m / 4m permitted depth) or is just outside PD due to a prior application, pre-app advice clarifies whether the proposal would need planning permission and how the officer would view it.

*3. Designs that may conflict with local policy*: Some London Boroughs have specific Supplementary Planning Documents (SPDs) or Design Guidance that applies to residential extensions — covering materials, proportions, roof profiles, and massing. Pre-app advice identifies which local policies apply and how the officer interprets them for the specific proposal.

*4. Loft conversions in conservation areas with dormers*: Dormer loft conversions in London conservation areas are a common planning challenge — the size, position, and finish of the dormer window is often contentious. Pre-app advice from the conservation officer can identify the acceptable dormer design before the full application is submitted.

*5. HMO conversions and change of use*: For a change of use from a C3 dwelling to a C4 small HMO, some London Boroughs have Article 4 Directions that remove the permitted development right for C3 to C4 change — a pre-app enquiry confirms whether the Article 4 Direction applies and how the proposal would be assessed.

**When pre-application advice is NOT necessary**:

• •Straightforward permitted development extensions where the proposal clearly meets the PD criteria and the property is not in a conservation area or Article 4 area
• •Lawful Development Certificate applications — the LDC route does not involve a planning officer's judgment, only a legal determination of whether PD rights apply
• •Simple householder applications for unlisted properties outside conservation areas in London Boroughs where the design guidance is clear and the proposal is obviously compliant

**What information to include in a London pre-app submission**:

A pre-app submission that gives you the most useful feedback includes:

• *1. Location plan and block plan*:
• •1:1250 or 1:2500 OS location plan with the property clearly outlined in red
• •1:500 block plan showing the site boundary, neighbouring properties, and the position of the proposed works relative to the boundary

• *2. Existing and proposed drawings*:
• •Floor plans (existing and proposed): 1:50 or 1:100 scale; clearly showing what is existing and what is proposed
• •Elevations (existing and proposed): all affected elevations; clearly showing the existing building outline and the proposed extension/alteration; material indications
• •Sections (if relevant): for loft conversions, basement works, or complex roof alterations, a section through the building showing the internal arrangement
• •Planning drawings do not need to be Building Regulations standard — they need to be clear and accurate, showing the key planning dimensions and relationships

• *3. Photographs*:
• •Current photographs of the property: front elevation, rear elevation, and the affected area
• •Street scene photographs: the wider context of the street/terrace
• •Examples of precedent: photographs of similar extensions or alterations in the same conservation area or street that have received planning permission (if known) — demonstrating precedent is a powerful argument in a pre-app submission

• *4. Design and Access Statement (or pre-app supporting statement)*:
• A brief written statement explaining:
• •What is proposed and why
• •The design rationale (why this form, height, materials, and position were chosen)
• •How the proposal relates to the local planning policies and design guidance
• •How the proposal addresses potential concerns (e.g., overshadowing; privacy; heritage impact)

This does not need to be long — a focused 1–2 page pre-app statement addressing the planning officer's likely concerns is more effective than a lengthy document.

**How to submit a pre-application enquiry in London**:

All 33 London Boroughs offer an online pre-application service through the Planning Portal or their own planning portal. The process: 1. Submit the enquiry online with the supporting information 2. Pay the pre-app fee (see costs below) 3. The LPA acknowledge the enquiry and allocate it to a planning officer 4. The officer reviews the submission and prepares a written response (typical timescale: 15–30 working days) 5. Some Boroughs include a meeting or call with the officer as part of the service; request this if available as it allows you to discuss the response and ask follow-up questions

**Pre-application advice fees in London (2025)**:

Pre-app fees vary between London Boroughs. Typical fee ranges:

| Proposal type | Typical pre-app fee in London (2025) | |---|---| | Householder extension (residential) | £100–£300 | | Householder extension with heritage/conservation area | £150–£500 | | HMO conversion or change of use | £250–£600 | | Larger residential development (multiple units) | £500–£2,000+ | | Meeting with officer (separate charge in some Boroughs) | £100–£250 additional |

The pre-app fee is NOT refundable and does NOT count toward the formal planning application fee. It is a separate charge for the advice service.

**What a pre-application response tells you**:

A planning officer's pre-app response is not a planning decision — it is an advisory opinion that is not binding on the LPA when the formal application is made (a different officer may be allocated; policy may change; a committee may override officer recommendation). However, a well-considered pre-app response provides:

*Principle of development*: whether the proposal is acceptable in principle or contrary to a specific planning policy. If the principle is rejected (e.g., 'this type of development would be contrary to Policy DM1 of the Local Plan') you have a fundamental design problem that needs resolution before submitting a full application

*Design concerns*: specific concerns about the design — the height, massing, materials, window size, or relationship to neighbouring properties. These are the concerns you must address in the redesign.

*Information requirements*: what the officer expects to see accompanying the formal application — heritage statements; daylight and sunlight assessments; noise assessments; transport statements; flood risk assessments; arboricultural impact assessments (if trees are involved)

*Policy references*: the specific planning policies, SPD provisions, and design guidance documents that apply to the proposal. These are the documents you and your architect should read carefully before refining the design

**How to respond to a negative pre-application response in London**:

If the pre-app response identifies concerns:

*Step 1: Understand the concern* Is the concern about the principle of the development (fundamental and difficult to overcome) or about the details (height; materials; impact on neighbours)? Concerns about principle require significant redesign or a different approach; concerns about detail can often be addressed by design refinements

*Step 2: Revise the design* Address the officer's specific concerns in the revised proposal. The revised drawings should clearly show what has changed from the pre-app submission — a comparative diagram showing the pre-app scheme and the revised scheme side by side is a useful tool in the planning statement

*Step 3: Request a follow-up* Some London Boroughs allow a follow-up consultation (at additional cost) to confirm that the revised design addresses the officer's concerns before the formal application. Where the pre-app fee allowed for a meeting and the first response was by letter only, it may be possible to arrange a meeting to discuss the response — ask the planning officer

*Step 4: Submit a clear application with a compliant proposal* When the formal planning application is submitted, the planning statement should cross-reference the pre-app advice by date and reference number, explain how the officer's concerns were addressed, and provide before/after comparisons where relevant

**Key London planning policies relevant to residential extensions and loft conversions**:

Every London Borough has its own Local Plan and supplementary planning documents. However, some common policy frameworks apply across London:

• •London Plan Policy D3 (Optimising Site Capacity) and Policy D4 (Delivering Good Design): all-London design quality policies
• •London Plan Policy HC1 (Heritage Conservation and Growth): applies to conservation areas and listed buildings across all London Boroughs
• •Individual Borough Local Plan: sets height limits, design requirements, and permitted development restrictions applicable to the specific Borough
• •Conservation Area Character Appraisals: borough-specific documents describing the special character of each conservation area; the basis on which planning applications for changes in conservation areas are assessed
• •Supplementary Planning Documents (SPDs) on Residential Extensions: many London Boroughs publish SPDs with specific guidance on the height, depth, width, and materials for residential extensions — Barnet Residential Extensions SPD; Richmond Design Guide; Southwark Residential Design Standards; Tower Hamlets Homes SPD are examples