Ask for recent references for work similar in size, age, and complexity to yours. Verify the contractor’s legal business details, relevant insurance, and the qualifications of licensed trades where applicable. Be cautious with pressure to sign immediately, a price that cannot explain its exclusions, requests for large unexplained cash payments, or reluctance to put scope and changes in writing.
For consumer-oriented contract guidance in Ontario, read the Ontario home renovation rights and contracts resource. It is general information, not a substitute for legal advice about your agreement.