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LASTING LTD – Cost Calculator 2025 Instant estimate for London projects. One click → WhatsApp enquiry (with borough from postcode). WhatsApp-first lead flow (no web forms) Per m² (Labour / Materials + QTY + Options) Loft Guide (fixed ranges) Postcode (optional, for borough) Auto borough/ward from postcode lookup (postcodes.io). Include VAT Exclude VATInclude VAT (20%)