How to Choose a Contractor for a Home Addition
Guide
How to choose a home addition contractor: licences, references, itemised bids, contracts, and the warning signs to walk away from.
Check credentials first.
Confirm licensing, insurance, and any required registration for your area, and ask for proof rather than taking it on trust. A legitimate builder expects these questions and answers them plainly.
Ask for recent, comparable work.
Visit or speak to owners of recent additions of a similar size and scope, not only finished photographs. Ask what went wrong, how changes were handled, and whether the final price matched the bid.
Compare itemised bids, not totals.
Give every bidder the same scope and drawings, and ask for structure, foundation, features, and allowances separated out. A total price without a breakdown cannot be compared, and a low total that omits work is not a bargain.
Put everything in writing.
The contract should cover scope, materials, schedule, payment stages tied to completed work, change procedures, and how defects are handled. Verbal promises about extras, finishes, or dates are the most common source of disputes.
Watch for warning signs.
Pressure to sign quickly, a large upfront payment, no written contract, vague allowances, or reluctance to provide references are all reasons to pause. A good builder is busy, transparent, and willing to be checked.
Related
Home addition cost calculator · Addition cost hub
- Home Addition Checklist
- Building Permit Guide
- Types of Home Additions
- Home Addition Financing
- Choose a Contractor
- Home Addition Timeline
Planning estimate only, based on 2026 cost data. It is not a quote. Get itemised bids from licensed local contractors before building, and set aside a 10–20% contingency for permits, design fees, and site surprises.