GDV.calculator

South East England GDV Calculator and BCIS Build Cost

South East England build cost 1,439 to 1,860 £/sqm (BCIS estate housing quartiles rebased to Medway, June 2025). GDV 420 to 680 £/sqft. Surrey, Kent and Sussex commuter belt pulls the mid band high; coastal Sussex and Hampshire anchor the floor.

BCIS build cost per sqm

  • Estate housing, lower quartile: 1,439 £/sqm
  • Estate housing, median: 1,628 £/sqm
  • Estate housing, upper quartile: 1,860 £/sqm
  • Flats, median: 1,886 £/sqm (quartiles 1,658 to 2,284)

BCIS figures rebased to Medway, as reprinted in Local Plan Viability Assessment 2025 Update (HDH Planning for Medway Council, June 2025, Appendix 10). BCIS data last updated 31 May 2025, rebased to Kent (location index 109). 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 420 to 680 £/sqft (low to high). Mid 525 £/sqft. Sense-check against current Land Registry Price Paid postcode-area aggregates before committing a bid.

Surrey, Kent, Sussex commuter belt premium versus coastal Sussex/Hampshire.

Viability culture

  • Most SE councils have adopted CIL and reference the 17.5 percent PoGDV PPG-Viability benchmark.
  • Sevenoaks, Guildford, Tunbridge Wells and Wokingham operate strict small-sites thresholds.

Working GDV anchors

  • Surrey commuter belt: £520 to £680/sqft.
  • Coastal Sussex / Hants: £420 to £525/sqft.
  • Always sense-check with Land Registry Price Paid before bidding.

Open the workbench with these rates

Inputs
MAX LAND BID£1,585,450At 20% profit on cost, 9 units, 950 sqft GIA each.
MARGINAL
GDV£3,815,438
Build cost£1,293,154
Prof fees£155,178
s106/CIL/BNG£108,000
Contingency£116,725
Finance interest£119,205
Target profit£358,453
Total costs (excl land)£1,792,263
Senior debt @ LTGDV£2,480,034
PoC13.0%
PoGDV11.5%
LTC73.4%
Sensitivity (PoC %)
Build -5%Build +5%Build +10%Build +15%Build +20%
GDV -15%14%15%15%16%16%
GDV -10%13%14%15%15%16%
GDV -5%13%14%14%15%15%
GDV 0%13%13%14%14%15%
GDV +5%12%13%13%14%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.

BCIS (RICS Building Cost Information Service) £/m² study data· Subscription data. Regional £/sqm figures on this site are BCIS figures as reprinted in named council viability studies (BCIS data dated Nov 2024 to Jul 2026), each linked where it is usedAppraisal model reviewed by Oliver Wakefield-Smith (data integrity) with chartered-surveyor (MRICS) and CTA tax review. No affiliate links.