GDV and CIL working numbers
- GDV: 730 to 1180 £/sqft
- Mid GDV: 910 £/sqft
- Borough CIL: 265 £/sqm
- Mayoral CIL2: Z1
Wandsworth CIL combined with Mayoral CIL2 £96.97/sqm in Zone 1 (2026-indexed, £80 base).
Local context
- SW18 covers Wandsworth Town, Earlsfield. Nine Elms / Battersea comparable evidence applies on prime sites.
- Wandsworth CIL plus Mayoral CIL2 Zone 1 £96.97/sqm (2026-indexed, £80 base).
- Small-sites policy: below 10 units, simplified planning route; above 10, full s106 stack.
- Working GDV mid £910/sqft on conversion; new build 1,000+ £/sqft on prime stock.
Open the workbench
Inputs
MAX LAND BID£2,507,652At 20% profit on cost, 9 units, 950 sqft GIA each.
MARGINAL
GDV£6,613,425
Build cost£2,422,678
Prof fees£290,721
s106/CIL/BNG£166,950
Contingency£216,026
Finance interest£220,617
Target profit£663,398
Total costs (excl land)£3,316,992
Senior debt @ LTGDV£4,298,726
PoC13.5%
PoGDV11.9%
LTC73.8%
Sensitivity (PoC %)
Build -5%Build +5%Build +10%Build +15%Build +20%
GDV -15%15%16%16%17%17%
GDV -10%14%15%16%16%17%
GDV -5%14%14%15%15%16%
GDV 0%13%14%14%15%15%
GDV +5%13%14%14%14%15%
Cells show profit-on-cost percentage at each GDV stress / build-cost shock pair. Cells below your target PoC turn amber-warm; cells below 10 percent abort.