Ask to see comparable projects
A contractor who mainly does bathrooms may be perfectly competent but will not have the same recent experience of steel installation, drainage and groundworks as someone building extensions regularly.
Read the quote against the drawings
The builder should be pricing the same design you intend to build. If structural calculations or specification are missing, large parts of the quote may still be assumptions.
Look for exclusions
Scaffolding, skips, utility alterations, Building Control fees, kitchen supply, decoration and flooring are common items that may sit outside the contract.
Agree communication before starting
Decide who can authorise extra work, how quickly decisions need to be made and how changes will be recorded.
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