Planning & Regulations5 min

Pre-Application Planning Advice in London: What It Is, When to Use It, and What to Expect

Pre-application planning advice is a formal (or in some London boroughs, informal) consultation service offered by Local Planning Authorities (LPAs) — in London, the 32 London boroughs and the City of London — that allows homeowners, developers, and architects to discuss a proposed development with the council's planning team before submitting a formal planning application. Pre-application advice is a valuable tool for managing planning risk: it allows the applicant to understand the planning officer's likely views on a scheme before spending money on a full planning application, and it gives the opportunity to refine the design in response to planning policy concerns before the formal submission. In London, where planning policy, conservation area designations, article 4 directions, character appraisals, and local guidance all add layers of planning consideration beyond national policy, pre-application advice can be particularly valuable — especially for more complex proposals (rear extensions in conservation areas, additional storeys on flats, roof terraces, side extension in sensitive locations, or changes of use).

Key Takeaways

✓Pre-application advice is a discretionary service offered by London borough planning departments. It is not legally required before submitting a planning application — but for more complex or uncertain proposals, it significantly improves the quality and predictability of the formal planning process. Pre-application advice allows applicants to: understand the planning officer's preliminary views on the proposal before paying the full planning application fee; identify and address design or policy concerns before formal submission; obtain guidance on what information (heritage impact assessments, ecology reports, transport statements, design-and-access statements) will be required with the formal application; demonstrate to the planning officer that the applicant is engaging positively and seeking to resolve issues — which can influence the tone of the formal determination process. Note: pre-application advice is a non-binding officer opinion. It is not a planning permission, and the planning committee or delegated decision is not bound by the pre-application advice given. However, a positive pre-application response from a planning officer is generally a strong indicator of likely success, and a negative response is an important early warning that the scheme needs to be redesigned before formal submission
✓London borough pre-application advice services vary in their structure, fee level, and turnaround time. Most London boroughs offer at least two levels of pre-application service: (1) written pre-application advice (officer response to a written description and drawings, without a meeting) — typically £200–£600 for a minor residential development in a London borough, with a turnaround time of 4–8 weeks; (2) pre-application meeting (written response plus a 30-to-60-minute meeting with the planning officer, heritage officer, or design review officer) — typically £400–£1,500 for a minor residential development, with a turnaround time of 4–8 weeks after submission of the request. Some boroughs offer a free or low-cost "householder pre-application" service for minor household development (permitted development queries, small extensions) that may be provided via email or telephone rather than a formal written response. Check the specific borough's planning pages for their current fee schedule and service options — fees and service levels change regularly
✓What the pre-application advice request should include: the written request for pre-application advice should be as complete as possible to get a useful response. Recommended content: full property address; description of the proposed development (what you want to do, why, and what the key design decisions are); a location plan (Ordnance Survey-based map at 1:1250 or 1:2500 scale showing the site and its context); existing and proposed floor plans; existing and proposed elevations; any relevant photos of the site and surrounding buildings; a brief planning assessment identifying the planning considerations you believe to be relevant (permitted development limits, conservation area policies, design guidance, etc.) and why you believe the proposal complies with or departs from them. A more complete request gets a more useful response — a vague "we want to extend the back of our house, what do you think?" request will typically receive a correspondingly vague and less useful response
✓The pre-application response document (typically a letter or formal email from the planning officer) will usually include: a description of the site's planning history and designations (conservation area, article 4 direction, TPO trees, listed building, locally listed building, flood zone, etc.); a preliminary assessment of the proposal against the relevant policies in the London Plan and the borough's Local Plan; specific concerns about the proposal (height, scale, massing, overlooking, daylight and sunlight impact, design quality, heritage impact, highway impacts, ecology, etc.) and how they might be addressed; guidance on what supporting documents would be required with a formal application; and a statement about whether, in the officer's preliminary view, the proposal is likely to be supported, is likely to require significant redesign to be supportable, or is unlikely to be supported in any form. The response may also identify consultees who would need to be notified (e.g., the Victorian Society for works to a Victorian terrace in a conservation area, or English Heritage for works to a listed building)
✓Pre-application advice is most valuable in the following situations: (a) the site is in a conservation area, adjacent to a listed building, in a locally listed building, or in an area with specific design guidance — where heritage and character considerations add significant uncertainty to the planning outcome; (b) the proposal is at or near the limits of what is likely to be acceptable under planning policy (e.g., a 4-metre rear extension in a terrace row where adjacent extensions are 3 metres, or an additional storey on a semi-detached house where the street has no precedent for this); (c) the proposal involves a change of use (converting part of a house to a residential unit or a commercial use); (d) the proposal may have impacts on neighbours (overlooking, overshadowing, highway visibility) that need to be managed before formal submission; or (e) the applicant is planning a more expensive or significant project where a refusal would cause significant financial loss. For a straightforward single-storey rear extension to a standard Victorian terrace in a non-conservation area, pre-application advice may add cost and time without proportionate benefit — the scheme is likely to be clearly within or clearly outside the permitted development limits, and a qualified architect or planning consultant can advise on likely permission without a formal pre-app

1. How Pre-Application Advice Relates to the Formal Planning Application
2. Pre-Application Advice for Heritage and Conservation Area Properties
3. Alternatives to Formal Pre-Application Advice
4. Frequently Asked Questions

How Pre-Application Advice Relates to the Formal Planning Application

A common misconception is that positive pre-application advice from a planning officer is equivalent to planning permission, or that it binds the LPA to approve the formal application. Neither is true — but the relationship between pre-application advice and the formal determination is nuanced.

How pre-application advice helps the formal application: A well-conducted pre-application process improves the formal application in the following ways:

The applicant can revise the scheme to address the officer's preliminary concerns before formal submission, reducing the risk of conditions, refusal reasons, or requests for further information during the formal determination period.

The officer who provided the pre-application advice may be (but is not always) the officer who determines the formal application. Where this is the same officer, the pre-application advice can create continuity and consistency in the planning assessment.

Pre-application engagement is generally viewed positively in the planning system — the National Planning Policy Framework (NPPF) and the London Plan both encourage pre-application engagement as a way of improving the quality and efficiency of the planning process. Some officers will note in their decision notice that pre-application discussions took place.

Limitations — what pre-application advice cannot do: Pre-application advice cannot guarantee planning permission. The formal application is determined by the decision-maker (usually a delegated planning officer, or in some cases the planning committee), who must apply the relevant planning policies at the time of determination. If planning policy changes between the pre-application discussion and the formal determination (for example, if the borough adopts a new Local Plan with stricter design policies), the formal application will be determined against the new policy.

Pre-application advice is an officer's preliminary opinion, not a committee decision. For larger or more controversial schemes, the planning committee (elected councillors) determines the application, and they are not bound by the officer's preliminary pre-application views.

The site and its context are not fixed. If a neighbouring property submits an extension proposal that changes the context of your proposal between the pre-application and formal submission, the planning assessment may change.

Practical advice: After receiving positive pre-application advice, document the advice and the scheme that was discussed clearly, and ensure the formal application accurately represents the scheme discussed in the pre-application. Avoid making material changes to the scheme between the pre-application and formal submission without either seeking updated pre-application advice or explaining the changes in the application documentation.

Pre-Application Advice for Heritage and Conservation Area Properties

London has over 1,000 conservation areas (more than any other UK city), and a significant proportion of London's residential building stock is either listed, locally listed, or located in a conservation area. For these properties, pre-application advice is almost always worthwhile before any significant works.

Why heritage pre-application advice is particularly valuable: Heritage and conservation area planning assessments involve subjective judgments about the impact of proposed works on the character and appearance of a conservation area or the significance of a listed building. These judgments are made by specialists — the LPA's heritage officer or conservation officer — and can be difficult to predict without specialist input. Pre-application advice gives the applicant direct access to the conservation officer's views before the scheme is finalised.

What the heritage pre-application process looks like: For works to a listed building, or significant works in a conservation area, the pre-application discussion typically involves: the planning officer; the conservation/heritage officer; and sometimes the design review officer or a design panel. The response will address: the significance of the heritage asset and its setting; the impact of the proposed works on that significance; whether listed building consent (in addition to planning permission) is required; what design changes might bring the scheme into compliance with heritage policy; and what additional heritage documentation (heritage statement, significance assessment, heritage impact assessment) would be required with the formal application.

Typical heritage pre-application cost: Heritage pre-application advice involving a meeting with the conservation officer typically costs £500–£2,000 in a London borough, depending on the complexity of the scheme and the heritage significance of the asset. For a listed building alteration project, this cost is usually modest relative to the total project cost and the risk of a refusal or enforcement action for works that did not receive listed building consent.

Practical tip: Before requesting heritage pre-application advice, commission a brief heritage significance assessment from a heritage consultant or qualified architect with heritage experience. A scheme that demonstrates understanding of the heritage significance of the asset and explains how the proposed works preserve or enhance that significance is much more likely to receive constructive pre-application advice than a scheme that does not engage with the heritage context at all.

Alternatives to Formal Pre-Application Advice

For simpler household projects, there are alternatives to the formal borough pre-application advice service that can provide useful planning guidance at lower cost and with faster turnaround.

Permitted development confirmation (Lawful Development Certificate): Where a project is intended to fall within permitted development (a rear extension within the specific size limits, a loft conversion using permitted development rights, a conservatory), the applicant can apply for a Lawful Development Certificate (LDC) — either a Lawful Development Certificate for Proposed Use or Development (LDCP). An LDC is a formal legal determination by the LPA that the proposed development is lawful (i.e., does not require planning permission). An LDC provides greater certainty than permitted development alone (it is a legal document that can be registered against the title and reassures mortgage lenders and future purchasers) but is not a planning permission. An LDC costs approximately half the planning application fee for a similar development.

Planning consultant or architect's preliminary advice: A qualified planning consultant or architect experienced in the relevant London borough can provide preliminary planning advice based on their knowledge of the borough's planning policies and recent decisions, without a formal pre-application request. This can be faster (days rather than weeks) and cheaper (£200–£500 for a brief written opinion on a straightforward case) than a formal borough pre-application, but it is the professional's opinion rather than the planning officer's opinion.

Checking appeal decisions and local planning history: The Planning Portal (planning.data.gov.uk) and the individual borough planning portals provide access to planning decisions and appeal decisions for sites in London. A review of recent planning decisions and appeal decisions for similar properties in the same street or conservation area can give a strong indication of the likely planning outcome for a new proposal, without any formal pre-application interaction.

Community and parish consultation: Some London conservation area advisory committees (CAACs) and amenity societies (the Victorian Society, the Georgian Group, the Twentieth Century Society) offer free or low-cost pre-application reviews of schemes in their area of interest. A letter of support from the relevant amenity society can be useful supporting documentation in a heritage-sensitive planning application.

Frequently Asked Questions

Is pre-application advice confidential?▼

Pre-application advice is generally treated as confidential by London borough planning authorities during the pre-application period. However, once a formal planning application is submitted, the pre-application correspondence may become publicly accessible as part of the planning application file (planning applications are public documents). Some boroughs have specific policies on the confidentiality and publication of pre-application correspondence — check the borough's pre-application advice service terms before submitting commercially sensitive or design-development material. In practice, for residential applications, the pre-application correspondence is rarely a significant confidentiality concern — the scheme will be publicly visible once a formal planning application is submitted in any event.

How long does pre-application advice take in London?▼

Turnaround times for pre-application advice in London boroughs typically range from 4 to 8 weeks from the date of submission of the pre-application request, depending on the complexity of the scheme, the borough's current workload, and the level of service requested. Some boroughs offer a faster-track service (2–3 weeks) for higher fees. A pre-application meeting request generally adds 1–2 weeks to the timeline compared with written advice only. During periods of high planning application volume (typically after planning fee changes, or following staff resource constraints), pre-application turnaround times can extend to 10–12 weeks. Allow sufficient time in the project programme for the pre-application process before formal submission.

If the pre-application officer says my scheme is unlikely to be approved, should I still apply?▼

A negative pre-application response is an important design signal, but it is not necessarily the end of the road. The response should be read carefully to understand the specific planning concerns raised. If the concerns are design-related (height, massing, materials, overlooking), the scheme may be redesigned to address them and resubmitted for updated pre-application advice or as a formal application. If the concerns are policy-based (the borough's policies simply do not support this type of development in this location), a formal application is unlikely to succeed without a material change in planning policy or circumstances. In some cases, where the applicant believes the officer's pre-application assessment is incorrect (e.g., that a policy has been misapplied), a formal application can be a way of obtaining a formal determination that can be appealed. Planning appeals sometimes succeed where pre-application advice was negative. However, making a speculative application against clear negative pre-application advice is generally not recommended — it wastes the application fee and the LPA's resources, and a refusal on the planning record can sometimes make subsequent applications on the same site more difficult.

Important Note

This guide is for general information only. Building regulations, planning rules, and legal requirements change regularly and vary by local authority. Always seek professional advice specific to your project and location. rcbGroup offers free initial consultations — book your free survey.

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