GDV and CIL working numbers
- GDV: 730 to 1180 £/sqft
- Mid GDV: 910 £/sqft
- Borough CIL (residential): 448.43 £/sqm
- Mayoral CIL2: Z1
Wandsworth's Annual CIL Rate Summary 2026 sets residential CIL at £448.43/sqm in all areas outside Nine Elms and Roehampton (£250 base, indexed 400/223), which covers SW18. Nine Elms Residential Area A pays £1,031.39 and Area B £475.34; the Roehampton charging area is nil. Mayoral CIL2 adds £96.97/sqm (Zone 1, 2026-indexed, £80 base).
Local context
- SW18 covers Wandsworth Town, Earlsfield. Nine Elms / Battersea comparable evidence applies on prime sites.
- Wandsworth CIL £448.43/sqm outside Nine Elms for 2026, 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£3,723,126At 20% profit on cost, 9 units, 950 sqft GIA each.
MARGINAL
GDV£6,613,425
Build cost£1,494,911
Prof fees£179,389
s106/CIL/BNG£282,511
Contingency£146,761
Finance interest£149,880
Target profit£450,690
Total costs (excl land)£2,253,452
Senior debt @ LTGDV£4,298,726
PoC10.7%
PoGDV9.6%
LTC71.9%
Sensitivity (PoC %)
Build -5%Build +5%Build +10%Build +15%Build +20%
GDV -15%11%12%12%13%13%
GDV -10%11%12%12%12%12%
GDV -5%11%11%12%12%12%
GDV 0%10%11%11%11%12%
GDV +5%10%11%11%11%11%
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.