Instant cost calculators and planning checkers built for London homeowners. Get indicative costs, check planning rules, and understand your project before you speak to a builder.
Get a Free QuoteEight tools covering the questions London homeowners ask most — from do I need planning permission? to how much will this cost? All free, all client-side, and built to match London's specific rules and costs.
Find out whether your project needs full planning permission, prior approval, or falls within permitted development — in under two minutes.
Use Tool →Check whether your project triggers the Party Wall etc. Act 1996, which notice type to serve, and what the timeline looks like.
Use Tool →Get an indicative cost range for your house extension in London — single-storey rear, side return, wraparound or two-storey.
Calculate →Estimate the cost of your loft conversion in London — from a simple rooflight conversion to a full mansard.
Calculate →Get a realistic cost range for a kitchen or bathroom renovation in London, from a cosmetic refresh to a full refit.
Calculate →Estimate the cost of a full London property refurbishment per square metre, from cosmetic work to structural overhaul.
Calculate →A room-by-room, trade-by-trade snagging checklist you can work through at handover. Print or download. Free.
Open Checklist →Generate a phased project timeline showing how long each stage realistically takes — from design to handover.
Build Timeline →Most homeowners come to a builder's first meeting having searched for cost guides or planning rules, found vague national figures, and left more confused than when they started. These tools are different — they are built specifically for London, where costs are higher, planning rules are tighter, and Article 4 Directions remove permitted development rights in swathes of inner boroughs.
Each tool produces a range, not a single number, because that is what honest estimating looks like. No tool can replace a site visit and a proper quote — but these will help you walk into that first conversation with a realistic frame, the right questions, and a much clearer idea of what you are dealing with.
All tools are entirely free, run in your browser, and store nothing. They are guidance, not a professional determination.
Our tools give you a starting point. For an accurate, itemised figure — book a free consultation and we will survey your site and send a detailed proposal.
Get a Free Quote