Stop clients designing projects they cannot afford.
Proxicost gives architects a credible UK residential build cost at RIBA Stages 1 to 2, line by line and in minutes. Shape scope and client expectations before a quantity surveyor is engaged.
Rear extension
32 m² · Zone 2-6
One project, specced basic to premium · budget, not a quote
See a real number in three answers.
Grand total by spec level
Calculating
The three figures are the same project specced basic, mid or premium throughout. In the full estimate you choose the spec item by item. Budget range, not a quote.
Rates from real London projects. Adjusted for the realities of yours.
Years of residential construction pricing experience
Material prices kept current with the market, not a static annual book
Extensions, refurbishments, lofts, basements and one-off homes
Proxicost is built and priced by the team behind a London architecture-led practice with 17 years pricing the residential work it builds. Rates are kept current as material and labour costs move, so your number reflects today’s market rather than last year’s price book. Every estimate is then adjusted for your London zone, listed or conservation status, and access difficulty.
A feasibility number before you bring in a QS.
Proxicost is the conversation you have in week one, not the document you commission in week six. It is built for generic-spec residential schemes. Highly bespoke schemes, where cost is driven by detail a questionnaire cannot capture, warrant a quantity surveyor, and Proxicost does not try to replace one.