The 2026 cost guideFree download
The 2026 cost guide for prime London.
Eight project types, priced for 2026. What a whole project includes, and what sits outside it.
What is insideEleven pages
What the guide adds, beyond the ranges.
A page for each of the eight, with the work photographed. Then what moves a figure, and how to budget the rest.
- 01Rear kitchen extension. Opening up the rear for a larger kitchen and dining space.
- 02Side return extension. Widening the ground floor of a period house for light and flow.
- 03Wraparound extension. Rear plus side return, for a much larger ground floor.
- 04Two-storey extension. Ground floor living space, plus bedroom accommodation above it.
- 05Main dormer loft. A new bedroom suite or office level, with a better stair.
- 06Mansard loft. Roof reconstruction, where planning context and heritage detailing both apply.
- 07Existing basement conversion. A gym, a cinema room, a guest suite or a family snug.
- 08New basement excavation. Leisure, wellness, staff or family space, where the site allows.
Each one carries its own 2026 range, and a photograph of finished work.
Only in the guide
Four things only the guide gives you.
- How to read a range, and what moves it. Size, access, structure, specification and services.
- A worked page for each of the eight types, with the finished work photographed.
- How to budget the whole project. Design, statutory costs, specification, contingency and VAT.
- One document you can keep, print, or send to your architect.
Ranges are guide prices, not fixed quotations. Professional fees, statutory costs, party wall, contingency and VAT are separate. Our quantity surveyor prices your own property properly, in a cost plan.
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