Measure the actual roof covering
A roof slope covers more area than its footprint. Ask the roofer for the measured roof area, and whether valleys, dormers and rooflights are included. Do not climb onto a roof to measure it.
What belongs in the budget
Scaffolding, stripping the old covering, disposal, membranes, battens, flashing and timber repairs.
How the calculation works
Materials = area × material rate × (1 + waste percentage). Labour = area × labour rate. Add extras, apply the contingency to that subtotal, then apply the VAT rate. The result is a scenario based on your inputs, not a supplier quotation.
Compare the same scope
Send each contractor the same measurements and written description. Ask for a fixed inclusion list, exclusions, waste arrangements, payment milestones and the treatment of unexpected work. Do not compare only the headline total.
Common questions
Are these average UK prices?
No. Default rates are illustrative inputs so you can explore a budget. Replace them with current written quotations.
Does my location change the result?
No automatic regional uplift is applied. Local access, travel and supplier costs belong in the rates you enter.
Sources & methodology
This page uses original budgeting guidance and transparent arithmetic. Example prices are chosen illustrations, not a survey of UK market prices. Replace them with written quotations.
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