Architect London shares insights into how long planning permission really takes in London and how to avoid delays.
How Long Does It Take to Get Planning Permission in London? 8 or 13 Weeks?
Are you wondering how long the council actually takes to decide on your planning permissions application? Is it really 8 weeks… or could it stretch to 13, 20, or even more? If you’re planning a house extension, loft conversion, or even a new build in London, knowing these timelines can save you months of frustration and uncertainty. In this guide, we explore what the official deadlines are, how they actually work in practice, and how experienced architect London can make the process smoother.
Official Timescales for Planning Permission in the UK
When you submit a valid planning permissions application to your local authority in London (such as Wandsworth, Bromley, or Camden), the council is legally required to make a decision within a set period:
8 Weeks – This is the standard timeframe for householder applications (like extensions, lofts, garages, and garden buildings).
13 Weeks – Applies to major developments, such as 10+ housing units, large commercial projects, or anything that involves significant change to the environment or infrastructure.
16 Weeks – If the project requires an Environmental Impact Assessment (EIA).
Sounds simple, right? But in reality, that’s just the beginning…
Does It Actually Take 8 or 13 Weeks?
Let’s be honest—rarely is it that simple.
In real-world London planning scenarios, several factors often extend the timeline:
Validation Delays: Councils won’t even start the 8-week clock until your application is validated. Missing a single document can delay the process by weeks.
Public Consultations: Neighbours and community stakeholders may be invited to comment, often triggering additional back-and-forth.
Requests for Further Information: Your council might ask for design tweaks, extra surveys, or updated plans—especially if you haven’t used a skilled London architect.
Planning Committee Schedules: Some applications must go to committee, especially if objections are received or the site is in a conservation area.
Holidays and Staff Shortages: Summer breaks, local elections, or staff turnover can cause months-long delays.
So while 8 or 13 weeks is the legal timeframe, many applicants find themselves waiting 3-6 months, sometimes more.
Why Are Planning Applications Delayed in London?
Every London borough has its own pressures: high volume of applications, tight budgets, and limited planning officers. Architects in London are keenly aware of these delays and usually design applications to pre-empt potential objections.
Common causes for delay include:
Conservation areas and listed buildings
Permitted development confusion
Poor-quality application documents or vague drawings
Neighbour objections or party wall disputes
Incorrect planning class use in commercial conversions
Outdated local plans that conflict with modern needs
How Can Architects in London Help?
Choosing the right architect in London can shave weeks off your timeline. Here’s how:
✅ They ensure your application is complete and validated quickly.
✅ They anticipate likely objections from planners and neighbours.
✅ They know what each council prefers—and avoids costly mistakes.
✅ They often liaise directly with planning officers to prevent rejection.
✅ They advise whether Permitted Development may be a faster alternative.
An experienced London architect won’t just draw plans—they’ll strategically plan your route through the red tape.
What If the Council Takes Too Long?
If your application hasn’t been decided within the 8 or 13 weeks (depending on the type), and you haven’t agreed to an extension, you can appeal to the Planning Inspectorate. But this adds more delay—and risk.
So it’s better to work with someone who understands how the system works in your borough. Architects in London routinely navigate delays and know when to push for results.
Tips to Avoid Planning Delays in London
📋 Submit a complete, clear application the first time.
🏛️ Check if your property is in a conservation area or near listed buildings.
📅 Avoid submitting in August or December, when council activity slows.
🗣️ Speak with neighbours beforehand to avoid objections.
🧭 Get pre-application advice with your architect—it’s worth the investment.
📞 Follow up regularly and push politely for updates.
Final Thoughts
Planning permission timelines in London are often more complex than they appear on paper. While 8 or 13 weeks is the technical target, many homeowners and developers in London find the real process takes far longer—unless you have expert guidance.
Working with London architects who understand the specific nuances of boroughs like Lambeth, Wandsworth, or Hackney can make all the difference between a quick approval and months of frustrating delay.
So, is it 8 or 13 weeks? Technically, yes. But in London, the real answer often depends on how well-prepared you are—and who’s on your team.
FAQs: Planning Permission in London
1. How long does planning permission really take in London?
➡️ Legally, 8 weeks for householder applications and 13 weeks for major projects—but delays are common.
2. What happens if the council misses the 8-week deadline?
➡️ You can appeal to the Planning Inspectorate, but most applicants agree to a time extension with the council.
3. Can I build without planning permission in London?
➡️ Some small extensions or lofts may fall under Permitted Development, but always check with a qualified London architect.
4. What’s the biggest cause of planning delays in London?
➡️ Incomplete applications, neighbour objections, and projects in conservation areas.
5. How can I speed up the planning process?
➡️ Hire an experienced London architect, get pre-application advice, and avoid peak holiday periods.
6. Do I need planning permission for a garden office?
➡️ Possibly not, if it falls under Permitted Development—but size, location, and use matter. Check with your council or architect.
7. Are London councils slower than others in the UK?
➡️ Often, yes—due to higher volumes and more complex planning conditions in urban zones.
8. Should I contact my planning officer directly?
➡️ It’s better if your architect does—it’s more professional and they know how to phrase the right questions.
9. Does planning permission expire?
➡️ Yes—usually after 3 years if you haven’t started construction.
10. What if my neighbour objects?
➡️ Their concerns are considered, but not always decisive. A well-prepared application can still be approved.
