Start with the same project information
Where possible, issue the same drawings, specification, schedule and tender clarifications to every contractor. Different information produces different prices.
Separate fixed scope from allowances
Identify provisional sums, prime cost allowances and uncertain quantities. These can move later, so do not treat every line as a fixed final cost.
Check exclusions line by line
A lower quotation may exclude scaffolding, decoration, external works, temporary protection, waste, specialist testing or other items included by another contractor.
Confirm VAT treatment
Check whether figures are stated inclusive or exclusive of VAT and compare the same basis across all quotations.
Identify client-supplied items
Separate products you intend to purchase directly from the contractor's installation cost. Clarify who takes responsibility for delivery, storage, damage, warranties and coordination.
Compare programme and resources
Price is only one dimension. A realistic programme, appropriate management and clear resource plan can materially affect disruption, risk and final outcome.
Frequently asked questions
Why are builder quotes sometimes very different?
Differences can come from scope interpretation, exclusions, labour assumptions, overheads, provisional sums, programme, specification quality and risk pricing.
What is a provisional sum?
It is an allowance for work or cost that cannot yet be fully defined. The eventual amount may change once the scope or supplier price is known.
Should I ask for a revised quote after clarification?
If material assumptions or scope differences have been identified, a clarified or revised quotation can make the final comparison more reliable.
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Read guide →Next step
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