Eight cost-line reference pages. Each documents the working benchmark, the source of record and how the line lands in the residual stack. Stress these inputs first on the sensitivity heatmap.
BCIS Q2-2026 general building cost index by region and building type.
Open →Planning cost overlay. When CIL applies, when s106 applies, BNG 10 percent uplift.
Open →Non-residential SDLT vs 5 percent residential surcharge. Six-or-more-dwellings rule.
Open →Architect, QS, planning consultant, legal, CDM. 10 to 15 percent of build cost.
Open →5, 7.5, 10 and 15 percent contingency by scheme risk.
Open →Agent fees 1 to 1.5 percent + VAT, legal per unit, 10-year warranty.
Open →S-curve drawdown, arrangement, monitoring, exit. IRR vs flat rate.
Open →17.5 percent PoGDV NPPF benchmark vs 20 percent PoC lender benchmark.
Open →