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Calculate residual land value for UK development sites. GDV, build costs, profit margin, and land bid price. Free development appraisal tool for investors.
Calculate Your SDLT — FreeResidual land value is the maximum price a developer can pay for a site and still make their target profit. It's calculated by taking the Gross Development Value (what the finished units will sell for) and subtracting all development costs — build, fees, finance, profit margin. The residual amount is the land value.
GDV is the total sales revenue from a completed development. It's calculated by multiplying the number of units by their expected sale price, based on comparable evidence from recent local sales. For example, 4 houses at £200,000 each gives a GDV of £800,000.
UK build costs in 2025 typically range from £120-£180 per square foot depending on location, specification, and project size. Standard new-build houses are around £130-£150/sqft. High-spec or London projects can exceed £200/sqft. BCIS data provides regional benchmarks.
Most UK developers target 15-20% profit on GDV for speculative residential schemes. Lenders typically require a minimum of 20% for development finance. Smaller refurbishment projects may work at lower margins. Our tool lets you test different margins to see their impact on land price.
CIL (Community Infrastructure Levy) and S106 (Section 106 agreements) are charges levied by local authorities on new developments to fund infrastructure. CIL is a fixed charge per square metre set by each council. S106 is negotiated on a site-by-site basis and can include affordable housing contributions. Both reduce the amount you can bid for land.