How Long Does Planning Permission Take?

Most householder planning applications in England have a statutory determination period of 8 weeks, and larger “major” applications have 13 weeks, or 16 weeks if an environmental impact assessment is needed. In practice, allow 10 to 14 weeks for most London applications once validation, consultation and any committee scheduling are factored in.

Design United Studio is a RIBA and ARB registered architecture practice based in Wimbledon Park, and we manage the planning process on projects across South West London and Surrey. This guide covers what the official timeline actually means, why real-world waits often run longer, and what happens if a council misses its own deadline.

Key Takeaways

• The statutory target is 8 weeks for most householder applications, 13 weeks for major developments, and 16 weeks where an environmental impact assessment applies.

• Real-world London timelines often run 10 to 14 weeks, mainly down to local authority backlogs and consultation requirements.

• Conservation areas, listed buildings and committee referrals (rather than a delegated officer decision) all typically add time.

• If a council misses the statutory deadline without agreeing an extension in writing, an applicant can appeal for non-determination.

• The government’s “planning guarantee” means no application should sit with decision-makers for more than a year, including any appeal.

What the Statutory Timeline Actually Means

The clock starts once an application has been validated, not from the date it’s first submitted. A local planning authority can ask for missing information or further documents before validating an application, and that back-and-forth doesn’t count against the statutory period.

Why Real-World London Timelines Often Run Longer

Most straightforward householder applications, like a single storey extension on a property with no unusual constraints, are decided by a planning officer under delegated authority, without ever going in front of a committee. Even so, London boroughs frequently take longer than the statutory 8 weeks in practice, usually because of caseload rather than anything specific to the application itself.

A handful of factors reliably add time on top of the baseline:

An application in Chelsea or Richmond, both areas with a high proportion of conservation areas and listed buildings, is more likely to need this extra consultation than one in an area with fewer heritage constraints, simply because of how many applications in those boroughs trigger it.

What Happens if the Council Misses the Deadline

If a local planning authority doesn’t decide an application within the statutory period, and hasn’t agreed a written extension with the applicant, the applicant has the right to appeal to the Planning Inspectorate on the grounds of non-determination, effectively treating the silence as a refusal.

In practice, most applicants agree to a short extension rather than appeal, since an appeal has its own timeline and doesn’t necessarily produce a faster outcome. The government’s planning guarantee is the broader backstop here: no application, including any appeal, should take more than a year to reach a final decision.

Getting the Timeline Off to the Best Start

The single biggest lever an applicant actually controls is the quality of what gets submitted. An application with a complete set of drawings, the right supporting statements, and no obvious gaps is far less likely to trigger a validation delay or a mid-process request for more information.

Pre-application advice, an informal conversation with the council before submitting, adds time upfront but often saves more than it costs, particularly on anything likely to be contentious. It’s a step we build into the early stages of the RIBA Plan of Work on most projects, since it surfaces problems while they’re still cheap to fix in the drawings rather than expensive to fix after a refusal.

For a larger or more complex scheme, an architectural feasibility study before formal design work starts can also flag planning risk early enough to change direction without having lost months to it.

Frequently Asked Questions

Does the 8-week clock start when I submit my application?

No, it starts once the application has been validated, meaning the council has confirmed all the required documents and fees are in place. An incomplete submission can sit in a queue before validation even begins.

Can I speed up a planning application?

Not formally, the statutory period is fixed, but a complete, well-prepared application with strong supporting evidence is far less likely to trigger the delays, further information requests and committee referrals that push a decision beyond the baseline timeline.

Does pre-application advice make the overall process faster?

It adds a few weeks upfront, but it often prevents a much longer delay later, either from a refusal that has to be redesigned and resubmitted, or from issues that only surface once a case officer starts assessing a formal application.

What’s the difference between a delegated decision and a committee decision?

A delegated decision is made directly by a planning officer and can happen as soon as the assessment is complete. A committee decision has to wait for the next scheduled committee meeting, which can add several weeks even after the officer’s assessment is finished.

Is the timeline different for a listed building or conservation area property?

The statutory determination period is technically the same, but these applications usually need extra consultation, sometimes with a conservation officer or Historic England, which in practice tends to push the real-world timeline closer to the upper end of what’s realistic.

If you’re planning a project and want a realistic sense of the planning timeline for your specific property, get in touch or read more about our planning permission service. We’re based in Wimbledon Park and manage the planning process on projects across South West London and Surrey.

Sources

• How long does it take to get a decision on an application? - Planning Portal — official planning guidance, used for statutory determination periods.

• Determining a planning application - GOV.UK — official Planning Practice Guidance, used for the planning guarantee and non-determination appeal process.