How Long Does Planning Permission Take?

Across 58,602 householder decisions, the average UK planning application took 9.3 weeks from validation to decision in 2025, against the statutory 8-week target. Averages hide wide variation, though: in the slowest councils a straightforward extension can take more than double that, and a single complication can push any application past three months.

Here's a realistic breakdown of how long the process actually takes — and what you can do to avoid the most common delays.

The Official Timescales

These are the targets set by government. If a council misses them, the applicant can appeal to the Planning Inspectorate on the grounds of "non-determination." In theory, this keeps councils honest. In practice, many councils routinely negotiate "extensions of time" with applicants — formally extending the deadline by agreement.

What Actually Happens

The 8-week clock starts when your application is validated — not when you submit it. Validation itself can take 1-2 weeks, sometimes longer. If documents are missing, the council sends it back and the clock doesn't start until you resubmit.

So the real timeline for a typical householder application looks more like this:

For a straightforward rear extension with no neighbour objections and no policy issues, 8-10 weeks from submission is realistic. But add one complication — an objection, a request for amended plans, or a committee referral — and you're looking at 12-16 weeks easily.

Why Some Councils Are Slower Than Others

Council planning departments have been under severe pressure for years. Budget cuts, staff shortages, and increasing application volumes mean that many teams are operating well beyond capacity.

Some councils — particularly larger urban authorities — have backlogs of several weeks before a planning officer even looks at a new application. Others, typically smaller district councils with lower volumes, can process applications closer to the 8-week target.

London boroughs are often the slowest. Inner London councils deal with complex sites, conservation areas, and high volumes of objections. It's not unusual for a householder application in Camden or Islington to take 12+ weeks even without complications.

By contrast, many councils in northern England and Wales process applications faster, partly because volumes are lower and partly because sites tend to be less constrained.

The Biggest Causes of Delay

Invalid applications. The single most common cause of delay. If your application is missing a document — a location plan, a biodiversity checklist, a design and access statement — it won't be validated. You'll get an email asking for the missing item, and the clock resets. This alone can add 2-4 weeks.

Neighbour objections. An objection doesn't mean refusal, but it does mean the planning officer has to address the issues raised. If the objection raises material planning concerns, the officer may ask you to amend the scheme. Amendments require a further round of consultation — and the clock effectively restarts.

Requests for amended plans. If the officer thinks the scheme could be approved with changes, they'll negotiate. This is usually a good sign — they're trying to get you to a yes. But each round of amendments adds 2-4 weeks.

Committee referral. Most householder applications are decided by officers under delegated authority. But if a ward councillor "calls in" the application, or if there are more than a certain number of objections (the threshold varies by council), it goes to the planning committee. Committee meetings happen monthly. If you miss the agenda deadline for the next meeting, you wait another month.

Specialist consultees. Applications near rivers need Environment Agency input. Sites near heritage assets need Historic England. These bodies have their own response times, and they don't always meet them.

How to Minimise Delays

You can't control everything, but you can avoid the most common self-inflicted delays:

• Check your council's validation checklist before submitting. Every council publishes one. Follow it exactly. Missing a single document is the most avoidable delay in the system.
• Use pre-application advice. Most councils offer a paid pre-app service (typically £100-£300 for householder proposals). This flags potential problems before you spend money on a formal application.
• Talk to your neighbours first. An objection slows everything down. A conversation over the fence before you submit can prevent one.
• Respond to officer queries quickly. When the planning officer emails asking for clarification or amended plans, don't sit on it. Every day you delay is a day added to the timeline.
• Submit online. Paper applications take longer to validate. Online submissions through the Planning Portal are processed faster by most councils.

What Happens After Approval?

Once you get the decision notice, planning permission is valid for three years. You must "commence development" within that period — which in practice means digging the foundations or starting meaningful construction work.

Your approval will come with conditions. Some need to be discharged (formally approved by the council) before you start work — for example, materials samples or construction management plans. Discharging conditions is a separate application, currently costing £43 per request in England, and typically takes 6-8 weeks.

You'll also need Building Regulations approval, which is a separate process from planning. Don't confuse the two — planning permission and building regulations cover different things.

The Bottom Line

The measured average is 9.3 weeks from validation to decision, across 58,602 householder decisions, but that average is pulled down by the many simple delegated approvals. For a typical householder application with the usual consultation, plan for 10-14 weeks, and longer again if it goes to committee. Simple schemes in fast councils can be quicker; complex schemes in busy councils take much longer.

The biggest variable isn't the council — it's the quality of your application. A complete, well-prepared submission with no validation issues and a design that fits local policy will almost always move faster than one that needs fixing along the way.

And the foundation for a good application is understanding what your council actually approves. That's where the data comes in.

Related Reading

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Why councils refuse planning permission
Planning permission vs building regulations
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