How Long Does Planning Permission Take? A Timeline for London Homeowners

The total time from starting the project to receiving planning permission is the sum of several sequential stages. Understanding each stage — and where delays are most likely — helps you plan the construction programme and manage your expectations.

The planning authority has eight weeks from the date of validation to determine a householder planning application. This is a statutory period set by the Town and Country Planning Act. If the authority does not determine the application within eight weeks, you can appeal to the Planning Inspectorate for non-determination.

The eight-week clock starts from validation, not from submission. Validation can take one to two weeks after submission — the planning authority checks that all required documents are present and the fee has been paid before registering the application.

In practice, many London boroughs determine straightforward householder applications within the eight-week period. Complex or contentious applications, applications requiring consultation with specialist statutory consultees (Historic England, the Environment Agency, Transport for London), or applications attracting significant neighbour objections may take longer. Some authorities routinely exceed the eight-week target and request extensions of time.

The most reliable way to speed up planning permission is to submit a well-prepared, complete application that does not require amendments or additional information during the assessment period.

Pre-application advice from the planning authority can reduce the risk of officer objections that would cause delays — but it adds time up front (typically four to eight weeks for a formal pre-application response from a London borough).

Ensuring the validation requirements are met precisely — correct scales, all required drawings, correct fee, red-line boundary correctly drawn — prevents unnecessary validation delays. We check every application package against the relevant authority's published validation requirements before submission.

Running building regulation drawings in parallel with the planning application (not waiting for planning permission before starting the building regulation package) saves six to ten weeks on the overall programme.

Applications in conservation areas or for listed building consent in London take longer than straightforward suburban householder applications. The key additional time comes from pre-application advice (advisable for all conservation area applications), more complex drawing preparation, and the involvement of specialist heritage consultees.

Conservation area applications in London typically take sixteen to twenty-four weeks from commission to decision. Listed building consent applications, which are often submitted alongside a householder planning application, add heritage officer assessment time and are determined within eight weeks of the same statutory period.

Where a project requires a Design and Access Statement or Heritage Statement, the preparation of these documents adds one to three weeks to the drawing preparation stage.

Planning permission does not allow you to start work immediately. Building regulation approval is also required, and depending on the works, party wall notices may need to be served (which require a one-month notice period before work starts for party wall matters).

From planning permission to being ready to start work on site, a typical project requires a further eight to twelve weeks: building regulation drawing preparation (three to five weeks), building control approval (five weeks statutory), and any party wall matters (four to eight weeks depending on whether agreements are reached).

In total, from the day you commission drawings to the day you can start work on site, the complete process for a London extension or loft conversion typically takes six to nine months, including planning, building regulations, and party wall.