How to Get Planning Permission for a Home Extension in London: A Step-by-Step Guide by Excela Architecture
- kyle6839
- Jun 14
- 3 min read
When considering a home extension in London, one of the first and most critical steps is securing planning permission. With complex planning regulations, conservation zones, and borough-specific requirements, navigating this process alone can be overwhelming. That’s where we come in.
At Excela Architecture London, we specialise in helping homeowners transform their properties with well-designed, regulation-compliant extensions. In this article, we explain everything you need to know about obtaining planning permission for a home extension in London — and how our expert team can help you every step of the way.
Do You Always Need Planning Permission?
The good news: Not always. Some home extensions can be built under Permitted Development Rights (PD), meaning they don’t require full planning permission. However, there are strict limitations on size, design, and location — especially in London, where properties are often in conservation areas, Article 4 directions, or designated zones.
At Excela Architecture, our first step with any client is to assess the property’s planning constraints and determine whether PD rights apply.
Types of Extensions That May Need Planning Permission
You’re likely to need planning permission for:
Two-storey rear or side extensions
Extensions on flats or maisonettes (PD does not apply)
Extensions on homes in conservation areas
Large single-storey rear extensions
Extensions exceeding height or volume limits under PD
If you're unsure where your project stands, we offer a free online planning consultation to help clarify your situation.
The Planning Permission Process: Step-by-Step
1. Site Assessment & Feasibility Study
At Excela Architecture, we begin every project by analysing the site constraints, council policies, and local planning history. We’ll visit your property or assess it remotely to understand what is feasible.
2. Initial Design Proposal
We’ll work with you to create an architectural design that matches your vision while staying within planning regulations. Our experienced design team understands what local councils typically approve — giving your application the best chance of success.
3. Planning Drawings & Documentation
Once the design is agreed, we prepare all necessary drawings and documents required for the application — including elevations, floor plans, site layout, and design and access statements if needed.
4. Planning Submission
We handle the full submission to your local London borough through the Planning Portal. We'll also act as your agent, communicating with the planning officer on your behalf.
5. Monitoring & Response
During the 8-week determination period, we monitor progress and respond to any planning queries or objections that arise. If needed, we’re ready to revise and resubmit.
How Excela Architecture Increases Approval Success
London’s planning environment is competitive and highly regulated. Our team of home extension architects in London bring years of experience with borough-specific policies across the city — from Barnet to Wandsworth, Camden to Croydon.
We don’t just design beautiful extensions — we design for approval. That means:
Local policy knowledge
Design solutions that meet both your needs and planning rules
Pre-application advice where beneficial
Strategic negotiation with planning officers
We also offer 3D visualisations and CGI renders to strengthen your application and help neighbours and planners visualise the final outcome.
What Happens If Planning Is Refused?
If your planning permission is refused, we offer:
A full review of the council’s reasons
Free resubmission where appropriate
Appeal preparation if required
Our goal is to help you achieve your dream extension with minimal stress — and maximum success.
Ready to Extend Your Home?
Whether you’re planning a rear extension, side return, wraparound, or a two-storey addition, Excela Architecture London is here to guide you from concept to completion.
We’re trusted home extension architects in London, delivering high-quality, planning-approved designs for homeowners across the capital.
Get Started Today
Book your free online consultation or contact us for a planning assessment.
📞 020 8064 4098
