Start with the licence and insurance
Contractor licensing varies by state and sometimes by city. Ask for the licence number and check it on the official register, not on the contractor's website. A number that belongs to a different name or a lapsed status is a stop sign. If the trade is not licensed in your area, ask for proof of registration and a track record instead.
Insurance is the second gate. Request a certificate of general liability and workers compensation, then call the insurer to confirm it is current. A certificate can be edited. A phone call takes five minutes and protects you from a claim if someone is hurt on your property. Our contractor guides explain the paperwork in more detail.
Read the reviews like a detective
Look for patterns, not star ratings. A single one-star review can be an unreasonable client. Ten reviews that mention the same delay, the same surprise invoice or the same unanswered phone calls are a pattern. Search the company name plus the word complaint, and check local trade boards.
Ask for references from jobs completed at least a year ago. Recent references are easy to stage. A homeowner who is still happy after a winter with the new roof is more useful. Call them and ask what went wrong, not just whether they were satisfied. Every project has a problem; the answer tells you how the contractor handles one.
Compare bids on the same scope
Three bids are useful only if all three price the same work. Write a scope that lists materials, quantities, brands or performance standards, and what is excluded. Then ask every contractor to price that document. A bid that is dramatically lower is usually missing something: prep, disposal, permits or labour for the awkward corner.
Do not choose on price alone. Compare the proposed schedule, the person who will actually run the job and the payment terms. A slightly higher bid from a crew that communicates clearly is often the cheaper project once delays are counted. Our kitchen contractor guide shows how to structure the comparison for a complex room.
The cheapest bid is not a price. It is a question about what the contractor has decided to leave out.
The contract must name the details
A contract should include the scope, the price, the payment schedule, the start and completion dates, the permit responsibility, the warranty and the change-order process. It should also name who is responsible for cleanup and disposal. If a contractor resists putting the schedule in writing, treat that as information.
Read the cancellation and dispute clauses before signing. Some contracts include an arbitration requirement or a lien waiver process that affects your rights. A lawyer is cheaper for one hour of review than for a dispute later. Never sign a blank contract or one with a scope described only as "renovation as discussed".
Payments and the deposit trap
Never pay the full job upfront. A deposit of 10 to 20 percent is normal for materials, and progress payments should follow completed stages. Keep a final payment of at least 10 percent until the punch list is finished and the inspections pass. Pay by bank transfer or card so there is a record, not in cash.
Be suspicious of a contractor who asks for a large deposit before ordering materials or who wants to be paid directly by your insurer. A legitimate crew has supplier accounts and can carry some cost. If the schedule requires a big early payment, ask for receipts and a written materials list.
Red flags worth walking away from
Walk away from door-to-door offers after a storm, prices that expire today, no physical address, no licence number and a request to pull the permit in your own name. Be careful when a contractor refuses to let you speak to the person doing the work or cannot explain who will be on site.
Also watch for a crew that asks you to lie about the scope to the insurer or the city. That is not flexibility; it is a liability that lands on the owner. Safety records matter too. The Occupational Safety and Health Administration publishes workplace safety guidance that is a useful background check for how a professional crew should operate.
Manage the job without micromanaging
Agree on a weekly check-in and a single point of contact. Keep a shared folder for contracts, change orders, receipts and photos. Document progress with dated images, especially before walls are closed. If a change is needed, price it in writing before the work proceeds.
Raise problems early and in writing. A contractor who fixes a small issue quickly is worth keeping. One who ignores messages for a week is telling you how the warranty will go. The goal is not a perfect project; it is a project where surprises are documented and resolved without a lawyer.