GDV and CIL working numbers
- GDV: 840 to 1350 £/sqft
- Mid GDV: 1050 £/sqft
- Borough CIL: 350 £/sqm
- Mayoral CIL2: Z2
Southwark CIL Old Kent Road zone. 35 percent affordable threshold above 10 units. Mayoral CIL2 Zone 2 (£72.73/sqm, 2026-indexed).
Local context
- SE1 covers Borough, Bermondsey, Elephant and Castle.
- Southwark CIL Old Kent Road zone plus Mayoral CIL2 Zone 2 £72.73/sqm (2026-indexed, £60 base).
- BTR yields hold at 4.5 to 5.0 percent net initial yield on prime SE1 stock.
- 35 percent affordable threshold applies above 10 units.
Open the workbench
Inputs
MAX LAND BID£3,406,174At 20% profit on cost, 9 units, 950 sqft GIA each.
MARGINAL
GDV£7,630,875
Build cost£2,422,678
Prof fees£290,721
s106/CIL/BNG£220,500
Contingency£220,042
Finance interest£224,718
Target profit£675,732
Total costs (excl land)£3,378,660
Senior debt @ LTGDV£4,960,069
PoC12.5%
PoGDV11.1%
LTC73.1%
Sensitivity (PoC %)
Build -5%Build +5%Build +10%Build +15%Build +20%
GDV -15%13%14%15%15%16%
GDV -10%13%14%14%15%15%
GDV -5%13%13%14%14%14%
GDV 0%12%13%13%14%14%
GDV +5%12%12%13%13%14%
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.