Plan your project in two minutes
Tell us about your home and what you want to achieve. We will put together a personalised summary covering the likely planning route, a typical timeline, what will affect the cost, and your next steps.
Last updated: 22 October 2026
Build your project summary
Six short steps. Your answers stay in this browser until you choose to send them to our team.
Step 1 of 6
Your project summary
Your project
Likely planning route
Party wall
Typical timeline
What will affect your cost
We do not publish prices because every project is different. Our team can prepare a detailed quotation after a visit.
Your next step
Get your full summary by email
We will email you this summary and our team will call to talk it through, with no obligation.
Five questions to answer before you start any building project
- What do you need the space for? A clear brief makes design simpler and saves money.
- How long will you stay in the house? It affects how much it makes sense to spend.
- Do you need planning permission? Use our Planning & Party Wall Checker.
- Can you stay at home during the work? It changes the programme and the overall cost.
- Who will design it? An architect for larger or complex projects, or a design-and-build approach for simpler ones.
FAQs
Do I need planning permission for a basement in London?
Usually, yes. Most London councils, including Wandsworth, Lambeth and Merton, treat new basements as needing planning permission.
How long does planning take?
The target for most householder applications is 8 weeks from when the council validates them.
Do you offer free quotations?
Yes. Our team visits your home, discusses the project and sends a detailed written quotation, free and without obligation.
Want an expert view on your house?
Our team can visit, look at your property and talk you through the next steps. It is free and there is no obligation.