Roofing Quote Calculator
Price roofing jobs from material quantities, labour rates, waste, and overhead. Get a professional quote with margin and tax included. Free, no signup.
Draft Smart Component
Build a component with pricing, waste, and labour rules, then calculate cost from measurements
Component spec
Area measurement in square metres. Used for roofing, flooring, cladding.
Measurement
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Roofing quoting — did you know?
The quoting formula
Quote = (materials × 1.waste) + labour + overhead + margin. Materials at trade price (not retail). Labour: day rate × days. Overhead: 15-25% of (materials + labour). Margin: 15-30% on top. VAT/tax on the total.
Material markup vs trade price
Roofers typically buy at 20-40% below retail. Quote materials at retail or slight discount (10% off retail shows customer they are getting a deal). Never quote at trade price — that gives away your buying advantage.
Labour calculation
Labour = crew_size × day_rate × days. 3-man crew at £350/day each = £1,050/day. 100 m² concrete tile roof: ~3-4 days stripping and re-roofing. Labour: £3,150-4,200. Scaffold + skip on top.
Common quoting mistakes
Forgetting scaffold (£500-1,500), underestimating waste, not pricing flashing/ridge/vents separately, no provision for timber repairs (rot found during strip). Always add a 10% contingency line.
Formulas used
Quote total
quote = (materials + labour + overhead) × (1 + margin%) × (1 + tax%)
Materials with waste
materials = base_materials × (1 + waste%)
Labour
labour = crew × day_rate × days
Overhead
overhead = (materials + labour) × 20%
Frequently asked questions
How do I price a roofing job?
(materials × 1.waste + labour + overhead) × (1 + margin) × (1 + VAT). 100 m² concrete re-roof: materials £3k, labour £4k, overhead £1.4k, 20% margin, 20% VAT = ~£12.8k quote.
What margin should I add to a roofing quote?
15-30% is typical. 15% for competitive work, 20% standard, 25-30% for specialist work or small jobs (overhead is proportionally higher on small jobs).
What overhead percentage for roofing?
15-25% of (materials + labour). Covers insurance, vehicle, phone, office, advertising. Sole traders: 15%. Companies with premises/staff: 25%.
Best free roofing quote calculator?
One that handles materials, labour, overhead, margin, and tax. This tool does all, free — and you can import quantities from the takeoff tab.