Asked straight

No. Planning Permission Checker is a free, early-stage property intelligence and feasibility tool. It does not submit applications and does not make planning judgements. It shows you the clearest available picture of the constraints, the likely consent route and the honest unknowns, so that when you do instruct a professional you are briefing them from facts rather than guesses.

No. The address and postcode checks are free, and there is nothing to buy on this site — we publish no reports for sale and no fees of our own. When a question needs professional judgement, we hand you to one of two named, independently regulated practices: Hampstead Architecture and Planning (ARB-registered architects) for design, drawings and the consent application, or Hampstead Chartered Surveyors & Building Consultancy (RICS-regulated, Firm Reg. 923064) for condition, party wall and leasehold matters. Each practice quotes you directly for the job in front of them; we publish no prices for their work.

planning.data.gov.uk for structured constraints, OS Open UPRN and OS Places for the property spine, HM Land Registry Price Paid for comparables, and EPC Open Data for energy. Every field links to its source, and MHCLG Extract folds in as its rollout reaches the London boroughs. We do not hold a feed of nearby planning decisions: every application, officer report and decision notice is published on the council's own planning register, which is free to search and which we link you to for your borough. Reading that record against your specific scheme is professional judgement, not a data lookup.

They are indicative planning-stage ranges, never a quote. Each project type is shown as a low / expected / high band, built from a cost-per-square-metre table and a typical floor area for that kind of work, labelled with its confidence and with the things that push a job towards the top of the range — awkward access, basements, drainage, listed fabric. The sold prices shown alongside are real HM Land Registry Price Paid transactions for the postcode; that dataset carries no floor areas, so we never turn it into a £/sqm figure or a value uplift. A real number comes from someone pricing a drawn scheme, and a formal valuation is a separate professional instruction this site does not provide.

All 33. We have coverage across all 33 London boroughs using official constraint datasets where available — conservation areas and Article 4 directions from official sources, live house prices and hand-written borough commentary — and the address check works on any London postcode. Two limits we state plainly rather than paper over: we do not publish nearby application decisions, because those live on each council's own public register and we link you to it; and where a council's Article 4 geometry hasn't yet reached the national dataset we say "verify on the council register" rather than reporting a confident "none".

No. A deterministic rules engine runs against structured government datasets. The language model only writes the explanation; it does not invent constraints or make planning judgements. Every claim carries a confidence tier and a source citation.

Three ways. First, the constraint answers aren't generated by a language model — they come from checking your property's own coordinates against the official constraint geometry, and anything we can't check is stated as not checked rather than guessed. Second, there is no "approval likelihood score": no algorithm can honestly score a London planning decision, so every figure is cited and confidence-labelled instead. Third, we don't sell you a report at the end of it. When the question needs judgement, it goes to a named professional — Hampstead Architecture and Planning (ARB-registered architects) for the scheme and the application, or Hampstead Chartered Surveyors & Building Consultancy (RICS-regulated, Firm Reg. 923064) for condition, party wall and leasehold matters — not to a bigger prompt.

No. The professional-help buttons take you to one of two independent practices — Hampstead Architecture and Planning (ARB-registered architects) or Hampstead Chartered Surveyors & Building Consultancy (RICS-regulated, Firm Reg. 923064) — to enquire directly, so you choose which one gets your details and what you tell them. We don't pass your details to builders or other third parties, and we do not sell address lookups to brokers.

Usually, check the property risks first. A builder can price works, but they may not confirm Licence to Alter, listed building consent, planning permission, party wall, structural or building-control requirements. The free check helps you understand what to investigate before you spend money.