How to use this roofing quote calculator
Use one card per contractor. Enter the quoted price, choose whether it includes VAT, then add only extras that have a confirmed VAT-inclusive price. If an exclusion is still unpriced, leave its amount out and record it in the notes. A blank is an unknown, not a saving.
Compare the work as well as the total
A repair, an overlay and a full roof replacement are different scopes. Check the roof areas, strip-off, named materials, insulation, ventilation, leadwork, access, waste and completion documents. This tool compares your numbers; it does not assess workmanship, confirm the correct VAT rate or establish whether a proposal is suitable.
Example: £7,000 excluding VAT at a rate of 20% becomes £8,400. A different quotation for £8,000 including VAT is £400 lower before scope differences. Check the applicable rate with the contractor rather than assuming it.
Ask for the missing details in writing
Send the comparison to each contractor with the same questions. Confirm hidden timber allowances, who approves variations, weather protection, payment milestones and what is excluded. Do not accept an unlimited verbal commitment to extra work.
Read the full roofing quotation checklist · See the North East new-roof cost guide
Need a clear written roofing quotation?
Send J&L Welch your postcode, roof details and photographs for a property-specific assessment.