Who this guide is for
- Homeowners about to hire a general contractor or trade.
- Anyone comparing multiple bids and wanting a structured way to evaluate them.
- Property owners writing a contractor brief for the first time.
Bring a written scope to the conversation
Every conversation starts smoother when the contractor sees a written scope first — even a one-page version. It tells them what is in and out, what the finish level is, and what they are being asked to price.
Without a written scope, quotes diverge for the wrong reasons and bids are not comparable.
Check licensing where applicable
Licensing requirements vary by jurisdiction and by trade. In many regions, general contractors, electricians, plumbers and gas-fitters must be licensed; in others, licensing is more limited.
Confirm what is required where the project is — and verify the contractor's status with the issuing authority, not just the contractor's website.
Confirm insurance
Ask for proof of liability insurance and any required workers' compensation cover. The contractor's insurance provider can usually confirm a current policy directly.
Ask for references on similar projects
References on similar projects are more useful than a long generic list. Ask about communication, schedule, change orders, cleanliness and how problems were handled — not just whether the client was 'happy.'
Compare written estimates carefully
A useful estimate names what is included, what is excluded, what allowances are used for unspecified items, and what assumptions the price depends on. Two estimates for 'the same job' are usually comparing different scopes once the assumptions are visible.
- Inclusions and exclusions listed explicitly.
- Allowances called out where finishes are not yet specified.
- Assumptions about existing conditions.
- Payment schedule tied to milestones.
- Change-order process and pricing rules.
Watch the communication signal
Pre-contract communication is usually the best version of what working with the contractor will feel like during construction. If responses are slow, vague or evasive now, that pattern rarely improves once a deposit is paid.
Use a written contract
A written contract should clearly cover scope, schedule, payment milestones, change-order rules, warranties and dispute resolution. Where required by jurisdiction, a contract may need specific clauses. Local legal review can be worthwhile for larger projects.
Contractor due-diligence checklist
- 1Bring a written scope to the conversation.
- 2Verify licensing where applicable, with the issuing authority.
- 3Confirm liability and workers' compensation insurance.
- 4Ask for references on similar projects and contact them.
- 5Compare written estimates including inclusions, exclusions and assumptions.
- 6Confirm allowances are realistic for the finish level.
- 7Agree on a milestone-based payment schedule.
- 8Agree on a written change-order process.
- 9Sign a written contract with warranty and dispute clauses.
- 10Keep all communication and approvals in writing.
Common mistakes to avoid
- Hiring on the lowest number without comparing scope and assumptions.
- Skipping reference checks because the contractor seems friendly.
- Paying large up-front deposits without milestone protection.
- Approving change orders verbally and reconstructing them later.
- Treating a one-page proposal as a contract.
- Ignoring licensing requirements that exist in the jurisdiction.
When to involve a professional
- Local laws set contract, licensing, lien and consumer-protection rules. A qualified local lawyer can review larger contracts.
- Electrical, plumbing, gas and structural work should be executed by licensed trades and inspected as required.
- Where the contractor is responsible for design — for example, in design-build — verify the qualifications of the design team as well.
Frequently asked questions
Questions readers ask about this topic
How many bids should I get?
Multiple bids — typically three is a common starting point — give a basis for comparison, but only when each is priced against the same written scope. One thoughtful bid against a clear scope can beat three bids against a fuzzy one.
Is a contractor without online reviews a red flag?
Not necessarily. Strong local contractors sometimes work largely from referrals and have little online footprint. Direct references from prior clients on similar projects are usually more informative than aggregate review scores.
How big a deposit is reasonable?
There is no universal answer, and some jurisdictions cap deposits by law. The principle is that payments should track work performed and materials delivered — not the calendar. Discuss the schedule of values before signing.
Should I ever pay in cash?
Paying in cash limits documentation and may complicate warranty, dispute and tax conversations later. Most homeowners are better served by traceable payments tied to invoices and milestones.
Keep reading