How Long Does Planning Permission Take? Realistic Timelines

One of the most common questions homeowners ask: "How long will planning take?"

The answer most architects give is "8 to 13 weeks." That's technically correct - but it's incomplete. It's the decision time, not the total time. The real timeline from "I have an idea" to "work is finished" is much longer.

Here's the reality.

The Official Timeline: 8 to 13 Weeks

These are the statutory decision times set by the Planning and Compulsory Purchase Act:

Standard applications: 8 weeks from submission to decision

Major applications (over certain thresholds): 13 weeks

Conservation area applications: Often take the full 8 weeks, sometimes longer if there are queries

This is the time for the council to review your application, consult neighbours, and issue a decision.

Important: This clock starts after you submit a valid application - not before.

The Real Timeline: 6 to 12 Months (Or More)

Here's what actually happens from start to finish:

Phase 1: Pre-Application Advice (4–8 Weeks)

Before you apply officially, you'll usually submit drawings to the council for informal feedback. This costs £100–300 and takes 2–4 weeks.

The pre-app achieves two things:

Council gives you feedback on whether your scheme is likely to be approved

You avoid major mistakes that would delay or kill the application

This step is not mandatory but is almost always worth doing. It saves time and money later.

Total time so far: 4–8 weeks (including back-and-forth)

Phase 2: Preparing Drawings and Planning Statement (4–10 Weeks)

After pre-app feedback, your architect or planning consultant refines the drawings and prepares the planning statement. This is the detailed document explaining why your proposal fits planning policy.

For complex projects (listed buildings, conservation areas, major extensions), this takes longer. For straightforward rear extensions, it's quicker.

Total time so far: 8–18 weeks

Phase 3: Submitting the Application (1 Week)

You submit the application to the council with all required documents. The council does a validation check to confirm everything is included. If something is missing, they ask you to resubmit (add 1–2 weeks).

Total time so far: 9–19 weeks

Phase 4: Statutory Decision Period (8–13 Weeks)

The council reviews the application. The clock runs for 8 weeks (13 for major applications).

What happens during this time:

Council reviews against local planning policy

Neighbours are consulted (21–28 day period; they can object)

Council planners write a report and recommendation

Application goes to planning committee (if contentious) or approved under delegated powers (if straightforward)

This is where delays often happen:

Council planners are slow (happens constantly)

Neighbours object, triggering a committee hearing (adds 4–8 weeks)

Council asks for more information or revised drawings (adds 2–4 weeks, extends the 8-week clock)

Total time so far: 17–32 weeks

Phase 5: Discharge of Conditions (2–8 Weeks)

Planning permission rarely comes with zero conditions. Common conditions include:

Submit materials samples for approval

Submit tree survey and arboricultural method statement

Submit detailed window and door schedules

Submit landscaping plan

Archaeological work (for certain areas)

You have to submit evidence that conditions are met before you can start work. Some councils are quick at approving these; others take weeks.

Total time so far: 19–40 weeks (4.5–9 months)

Phase 6: Building Regulations Approval (2–4 Weeks)

Once you have planning permission, you apply for Building Regs approval. This covers structural safety, energy efficiency, fire safety, etc.

The council Building Control team reviews structural drawings and specifications. They usually approve within 2–4 weeks.

Total time so far: 21–44 weeks (5–10 months)

Phase 7: Final Building Regs Sign-Off (1–2 Weeks)

Once work is finished, a Building Control inspector visits to confirm the work meets regs. They sign off the completion certificate.

Total time from start to finish: 22–46 weeks (5–11 months)

But Wait - There's More

If your project is complex or contentious, add more time:

Listed building consent (additional process for listed buildings): +8–13 weeks

Conservation area application with objections → Committee hearing: +4–8 weeks beyond the 8-week period

Environmental impact assessment (for certain major developments): +8–12 weeks

Archaeological assessment: +4–8 weeks

Multiple rounds of condition discharge (if council keeps asking for revisions): +2–8 weeks per round

A contested planning application in a conservation area can take 6–12 months just to get permission, before you even start Building Regs.

Real-World Examples

Example 1: Simple Rear Extension in a Normal Neighbourhood

Pre-app advice: 6 weeks

Drawings + statement: 6 weeks

Submission + validation: 1 week

Decision period: 8 weeks (no objections, approved within the statutory time)

Condition discharge: 2 weeks

Building Regs: 3 weeks

Total: 26 weeks (6 months)

Example 2: Two-Story Rear Extension with Objections

Pre-app advice: 8 weeks

Drawings + statement: 8 weeks

Submission + validation: 1 week

Decision period: 8 weeks initial, but neighbours object → goes to committee → adds 6 weeks

Condition discharge: 4 weeks (council asks for revisions)

Building Regs: 4 weeks

Total: 39 weeks (9 months)

Example 3: Loft Conversion in a Listed Building

Pre-app advice: 8 weeks

Drawings (more detailed for listed): 10 weeks

Historic England consultation: 4 weeks (built into the 8-week clock)

Submission: 1 week

Decision: 8 weeks

Condition discharge (materials, etc.): 3 weeks

Building Regs (stricter for listed): 4 weeks

Total: 38 weeks (8.5 months)

How to Speed Things Up

1. Do pre-app advice properly – Get council feedback before you invest in full drawings. This catches issues early.

2. Hire an experienced planning consultant – They know your council and can anticipate objections. Worth £1,000–2,000 to save 4–8 weeks.

3. Avoid peak periods – Summer (July–August) and holidays slow councils. Submit in spring or autumn if you can.

4. Design within policy from the start – If your scheme clearly fits local planning policy, there's less to argue about and fewer delays.

5. Respond quickly to council queries – If they ask for information, send it within 48 hours. Delays on your end extend everything.

6. Minimise conditions – During pre-app, ask what conditions are likely. Design to avoid them if possible.

7. Don't use agents or planners who are slow – Choose people with a good track record in your council area.

One More Important Thing: Permission vs. Commencement

Once you have planning permission, you have 3 years to start work before the permission expires. Once work has "commenced" (which can mean almost anything - digging a foundation, placing a materials skip, etc.), the permission is "live."

But this doesn't mean you should rush. Many people get permission and don't build for 1–2 years. That's fine, as long as you've started something.

The Honest Bottom Line

Planning permission takes 5–11 months for straightforward projects. For complex or contested projects, it can take 12–18 months or longer.

If you're planning a home improvement:

Don't tell yourself it'll happen in 8 weeks

Budget 6–12 months from initial idea to breaking ground

Use that time wisely: do pre-app advice, refine your design, get Building Regs drawings ready in parallel

The councils aren't slow to be difficult - they're just under-resourced and every application takes time.

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Want to understand the timeline for your specific project? Use PlanCheck to assess your property, understand what application type you'll need, and get realistic timings for your local council. Check your project now.