What it covers
Plan of Work fee structure (% of construction cost, lump sum, or hourly); RIBA Chartered Practice register.
What it costs
Typical one-off house fees 7-15% of build cost (Plan of Work Stages 1-6); lower for design-only.
What changed recently
Plan of Work 2020 still current. RIBA published 2024 Fee Benchmarking confirming sub-£1m residential commands 10-15% blended fee.
Where it fits in a UK knockdown rebuild
Use RIBA (Royal Institute of British Architects) as one input among several when sizing a KDR. The calculator on this site cross-checks against BCIS, FMB, and HMRC simultaneously so no single reference drives the headline. For the live worked example, see the calculator; for every figure's primary source, see the sources ledger.
Primary source
Verified 2026-06-21 against the source URL above.