Planning-stage figures for London projects, by borough and specification level. Flat and house renovations show a range excl. VAT from the Hampstead Renovations project ledger; loft conversions, extensions and basements show what drives their cost, the professional fees and the build time. It is a planning guide, not a quote.
Speak to the studio directly: 020 7101 3168
No black box. Each range states where it comes from and what it excludes.
Loft and extension costs turn on the roof structure, the size and the design, so instead of a headline range the calculator sets out what drives the cost, the fees and the build time.
Flat and house renovation bands draw on the Hampstead Renovations project ledger, cross-checked against published component costs.
Figures are normalised to exclude VAT wherever the source allows. Where a source's VAT treatment is unstated, the band is flagged as indicative market context and never multiplied.
Basement costs swing too widely on waterproofing, access and ground conditions for a headline range to be honest — the calculator routes you to a bespoke assessment instead.
When you are ready, our architects, engineers, surveyors and builders turn your range into a fixed, itemised quotation under one contract.
Tell us about your project. We reply within one working day, Monday to Friday, 8am to 6pm.
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