Best Home Addition in Seattle

Because an addition alters your home's structure and mechanical systems, the contractor you choose matters more than on almost any other renovation. Confirm the general contractor is licensed where your municipality requires it, carries general liability insurance, and holds valid workers' compensation coverage such as WSIB or WorkSafeBC so injuries on your property are not your liability. Ask whether they work with a licensed structural engineer and registered architect or designer, since second-storey additions and new foundations legally require stamped drawings. The electrical and gas portions must be done by licensed electricians and gas fitters who pull their own permits and pass inspection, not by handymen.

Just as important is verifying the contractor actually specializes in additions rather than only interior renovations, because the two demand different skills in excavation, structural tie-ins and weatherproofing where new meets old. Ask to see completed additions and speak with those homeowners about whether the project stayed on schedule, how change orders were handled, and how the crew managed living in the home during construction. Get a detailed written contract that spells out the scope, permit responsibilities, payment schedule tied to milestones, and how the new addition will be integrated and finished to match. A clear, itemized agreement protects both sides when a project runs several months.

Whoever you shortlist from the ranking above, ask each for a written scope, proof of insurance, and two recent Seattle references before signing.