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Checklists, calculators and guides we use ourselves and share for free.
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Checklist
London Builder Vetting Checklist
27-point checklist Builderr uses to assess subcontractors. Print, tick, share. No email required.
Open →Calculator
Loft Conversion Cost Calculator
Live cost ranges for every loft type — Velux, dormer, hip-to-gable, L-shape, mansard.
Open →Calculator
House Extension Cost Calculator
Per-square-metre and per-type cost ranges for London extensions, 2026 data.
Open →Long-form guide
Loft Conversions in London — Complete 2026 Guide
Single-source overview of every loft type, cost band, planning route and pitfall.
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