London GDV Calculator and BCIS Build Cost

BCIS build cost per sqm

• Estate housing, lower quartile: 1,663 £/sqm
• Estate housing, median: 1,882 £/sqm
• Estate housing, upper quartile: 2,150 £/sqm
• Flats, median: 2,181 £/sqm (quartiles 1,917 to 2,640)

BCIS figures rebased to Wandsworth, as reprinted in Local Plan Partial Review, Site Allocations Viability Assessment (SD043) (BNP Paribas Real Estate for LB Wandsworth, June 2025, Appendix 3). BCIS data last updated 31 May 2025, rebased to Wandsworth (location index 126). 15-year default sample. BCIS rates are gross internal floor area, include preliminaries and exclude external works, fees, contingency and VAT. BCIS itself is subscription-only; this is the most recent public reprint we found for the region.

GDV working band

Resale GDV 620 to 1200 £/sqft (low to high). Mid 780 £/sqft. Sense-check against current Land Registry Price Paid postcode-area aggregates before committing a bid.

Build cost figures are rebased to Wandsworth, an inner borough; outer boroughs carry lower BCIS location indices.

Mayoral CIL2 zones

• Zone 1: £96.97/sqm for permissions granted in 2026 (£80 base). Camden, City of London, Westminster, Hammersmith & Fulham, Islington, Kensington & Chelsea, Richmond, Wandsworth.
• Zone 2: £72.73/sqm (£60 base). Hackney, Lewisham, Southwark, Tower Hamlets, Lambeth, Ealing, Brent and most other inner-outer boroughs.
• Zone 3: £30.30/sqm (£25 base). Barking & Dagenham, Bexley, Croydon, Greenwich, Havering, Newham, Sutton.
• Rates index annually by the RICS CIL Index (Ip 400 / Ic 330 in 2026). Borough CIL stacks on top; always check the borough's adopted charging schedule.

Borough CIL on top of Mayoral CIL2

• Each borough charges its own CIL as well, set in its charging schedule and indexed each year in its Annual CIL Rate Summary. Southwark adopted a new schedule on 29 September 2026.
• The borough pages give each council's published residential rate and the zone that covers the postcode.

Open the workbench with these rates