Do you need planning permission?
Answer three questions. We screen the address against the official conservation-area and Article 4 geometry and tell you which planning route you are realistically on — and, just as important, what we cannot determine from a postcode.
What are you building?
The default London move: kitchen-diner across the back.
Infilling the Victorian alley for a full-width kitchen.
A bedroom and bathroom in the roof — the value workhorse.
The biggest space gain — and the hardest consent in London.
Office, studio or gym at the end of the garden — often no planning needed.
Is it a house or a flat?
Planning Permission Checker provides planning and cost intelligence for early feasibility only. It is not legal, planning, valuation, architectural, structural, or surveying advice. All estimates are indicative and must be verified by qualified professionals before purchase, design, planning submission, or construction.
Cost estimates are indicative only — not a quotation. Final price depends on survey, specification, structure, access, party wall matters, VAT, professional fees, and contractor availability.
Planning outcomes are not guaranteed. Local planning authorities make final decisions.