Choose a construction contractor through documented due diligence—not the lowest headline bid. Define the work first, verify each candidate’s credentials and relevant experience, compare written bids against the same scope, and put responsibilities, payments, timing, and change approvals in a signed contract. Licensing, insurance, permitting, and payment rules vary by location, so confirm them with your local licensing authority and building department.
Start with a defined project and local requirements
Contractors can only produce useful, comparable bids when they are pricing the same job. Before you invite proposals, assemble the plans, specifications, and written scope available for your project. Describe the work clearly enough to distinguish included work from items that are outside the contract. If the plans or specifications are incomplete, identify assumptions and open decisions so candidates do not silently price different versions of the project.
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Contact the local building department early to ask what permits or approvals may apply and who may apply for them. Requirements differ by place and project type. Do not assume that a contractor’s customary process—or a rule described for another state or country—applies to your project. Permit requirements, who is eligible to apply, and any related contract terms are local matters, so verify them before finalizing the scope and responsibilities.
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- Provide every candidate with the same plans, specifications, and scope.
- List known constraints, such as access, occupied areas, sequencing needs, or required coordination with other parties.
- Ask the building department about permits and approvals; later, make the contract explicit about who will obtain them.
- Keep a written record of clarifications sent to all bidders so one candidate does not receive a material scope advantage.
When a project detail is undecided, do not let each contractor quietly make a different assumption. State what is known, identify what remains open, and ask bidders to show how that uncertainty affects their proposal. This makes it easier to distinguish a genuine price difference from a difference in what each person believes the project includes.
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The Federal Trade Commission’s U.S. consumer guidance recommends getting written estimates and checking local licensing requirements; because that guidance is dated approximately 2014, treat it as general advice and confirm current rules locally: Hiring a Contractor.
Build a shortlist around relevant experience
Seek referrals from people familiar with comparable work, and consider relevant local professional or building associations as referral sources. Interview more than one qualified candidate. A contractor’s experience matters most when it is relevant to the type, scale, and complexity of your project; a long list of unrelated jobs is less useful than evidence of similar completed work.
Use the interview to learn how the candidate would actually deliver this project, not just to hear a general description of the business. Ask who will be responsible for day-to-day supervision, how progress and problems will be communicated, and which portions will be subcontracted. A contractor may use subcontractors, but you should understand what work they will perform and how the contractor plans to coordinate that work. Compare these answers across candidates rather than relying on a broad promise that the project will be managed.
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- What comparable projects have you completed, and what was your role?
- Who would supervise this project day to day, and how will you communicate progress or problems?
- Which parts of the work would be subcontracted, and how will you manage and coordinate those subcontractors?
- Can you provide recent clients who can discuss workmanship, schedule, pricing, and how problems or defects were handled?
- What current workload or scheduling constraints could affect the proposed start and finish?
Speak directly with references rather than relying only on a list of names. Ask about what was promised, what changed, whether the work finished when expected, how additional costs were handled, and how the contractor responded when something went wrong. These conversations can help you judge the quality of communication and problem handling as well as the finished work. Where practical, view completed work or an active site. Washington State Department of Labor & Industries recommends checking references and, if possible, viewing work or a current site: Hire Smart Step-by-Step.
References are evidence to weigh, not a substitute for checking credentials and written commitments. Ask for examples that are recent and comparable, then relate what you hear to the requirements of your own project. A satisfied client on a smaller or very different job may not answer questions about a major project’s schedule, complexity, or subcontractor coordination.
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Verify identity, licensing, public record, and coverage
Before treating a candidate as qualified, obtain the contractor’s legal business name and license or registration number. Check them using the current tool of the licensing authority for the jurisdiction where the work will occur, or contact the authority directly. Verify current status and review publicly available disciplinary or complaint information where such records are offered. If the project involves regulated trades, determine whether separate credentials are required for that work.
Use the authority’s own information, not just a number or status described in a proposal. Confirm that the business identity and credential details match the contractor you are considering, and check again if there is uncertainty about current status. Record what you verified and when. The specific lookup options and records available vary by jurisdiction, so an absence of a particular online record should not be treated as proof of a clean record or as a universal standard.
A license, registration, bond, or insurance policy is a compliance and risk-control matter—not proof of workmanship or a guarantee that the project will go well. Confirm what coverage and bonding are required for your project under local law, request evidence that applies, and understand who is covered and for what. Requirements and public verification tools are jurisdiction-specific. For example, Washington’s state tool addresses contractor registration, bond, liability insurance, and infractions; California’s Contractors State License Board provides state-specific license and insurance information. Neither state’s rules should be assumed to govern work elsewhere.
Use the relevant local or state authority rather than relying on a contractor’s own description of their status. State-specific guidance is available from the California Contractors State License Board and the Alaska Division of Corporations, Business and Professional Licensing. Check your own jurisdiction’s licensing authority and building department for current requirements.
Compare bids on the same scope—not just the total
Request complete written bids from qualified candidates using the common project information. Lay them side by side and identify what each price actually buys. A low total may reflect omitted work, different materials, unrealistic assumptions, or costs shifted into allowances or later changes. A higher bid is not automatically better, either; ask bidders to explain meaningful differences and clarify uncertain items before selection.
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A useful comparison starts with the same baseline: plans, specifications, written scope, and clarifications provided to all candidates. Then examine the details, rather than treating the total as the proposal. Check quantities and quality of materials, labor, major suppliers, proposed subcontractors, exclusions, taxes and permit fees, start and completion expectations, warranties, and payment terms. If one bidder has included something the others have not, determine whether the proposals can be brought into alignment before making a decision.
| Compare | What to establish in each written bid |
|---|---|
| Scope and quantities | Which tasks, areas, quantities, and deliverables are included, and what is excluded? |
| Materials and quality | What products, grades, finishes, or performance specifications are assumed? Are substitutions permitted? |
| Labor and subcontractors | What work is performed by the contractor, and what is assigned to subcontractors? Who coordinates them? |
| Allowances and exclusions | Which costs are estimates or allowances rather than fixed commitments? What work or conditions are excluded? |
| Additional charges | How are taxes, permit fees, delivery, disposal, and other listed charges treated? |
| Schedule | What start and completion expectations are proposed, and what assumptions or dependencies affect them? |
| Payments and warranty | What are the payment milestones, and what warranty terms or procedures are offered? |
| Changes | How will a change be priced, approved, and documented before the added work proceeds? |
Ask a bidder to explain any material gap, unusually low or high amount, vague allowance, or exclusion that could affect the result. Ask what an allowance covers and how an uncertain cost will be resolved; do not mistake a provisional estimate for a settled commitment. Make sure revisions and clarifications are written down and applied consistently when comparing candidates. The FTC, Washington, Alaska, and California guidance all support written estimates or comparable bids and warn against relying on price alone; the practical goal is to compare complete commitments on a shared scope.
Use a consistent decision framework
There is no universal weighting formula for selecting a contractor. Decide which risks matter most for your project, then assess every candidate against the same criteria. A project with complicated sequencing may place greater weight on supervision and comparable experience; a project with tight cost limits may need especially careful scrutiny of allowances, exclusions, and change procedures. The framework should help expose unanswered questions, not create an artificial score that decides the job for you.
| Criterion | Evidence to consider |
|---|---|
| Relevant experience and references | Comparable work, direct feedback from recent clients, and site visits where practical. |
| Credentials and record | Current license or registration verified with the responsible authority, plus public disciplinary information where available. |
| Insurance and bonding | Evidence applicable to the project and compliance with local requirements. |
| Bid fit | How closely the proposal follows the common scope, with clear materials, inclusions, exclusions, and allowances. |
| Schedule and capacity | Credible timing, current workload, and an identified plan for supervision. |
| Subcontractor management | Named or explained subcontracted work and a clear approach to coordination and accountability. |
| Warranty and changes | Understandable warranty terms and a written approval process for scope or price changes. |
| Total cost | The price in context: what is included, what remains uncertain, and what may create additional cost. |
Do not convert this list into an automatic score that obscures a deal-breaker. An unverified credential, unclear responsibility for critical work, or an unexplained exclusion may warrant resolution before price is meaningfully compared. If a bid or interview leaves a material issue unanswered, ask the candidate to clarify it in writing and consider that response alongside the other evidence.
Put the complete agreement in writing
Before work begins, sign a contract that identifies the parties and describes the actual agreement, not just a one-line project label and a total. Attach or clearly identify the plans, specifications, bid, and clarifications that define the work. Check that the final contract matches the proposal you selected, including any written revisions made during the comparison process. For a major or complex project, consider having a qualified construction lawyer review the terms before signing.
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Contract terms to make clear
- Legal names of the owner and contractor, and the contractor’s applicable license or registration details.
- Scope of work, plans, specifications, materials, quality expectations, and express exclusions.
- Contract price and how allowances or other uncertain costs will be resolved.
- Payment milestones tied to defined work or progress, plus the documentation required for payment.
- Expected start and completion timing, and how schedule changes will be communicated.
- Who obtains permits and approvals, and who coordinates inspections.
- Who supervises the job and manages subcontractors.
- Warranty terms and how to report and address defects or incomplete work.
- A change-order process requiring the proposed scope, price, and schedule effect to be documented and approved in writing before changed work proceeds.
A change in scope can also change price or timing. Make the approval process clear before construction begins: document what is changing, the cost effect, any schedule effect, and the approval before the added or revised work proceeds. Keep the signed change with the contract records so the current agreement remains clear to both sides.
California CSLB guidance specifically recommends written agreements and written changes and identifies work, price, payment, permits, and completion timing as contract terms. That is California guidance, not a universal contract rule. Cancellation rights, notices, payment restrictions, lien-related requirements, and required contract language differ by jurisdiction. Ask the local licensing authority or building department what applies, and do not import another state’s thresholds or rules.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Control payments and preserve a project record
Make payments according to the signed agreement and connect each milestone to defined progress rather than paying simply because a date has arrived. Do not make an upfront payment without a signed contract. The payment schedule should be clear enough that you can tell what work or progress is associated with each payment, and you should retain evidence of payments made.
Keep the signed agreement, approved changes, invoices, receipts, permits, inspection records, and important communications together; a clear record helps both sides track what was agreed and what remains due. If a conversation results in a change or clarification, record it in writing and confirm that the contract or change documentation reflects it. This is especially important when the scope, cost, or timing changes.
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Selection checklist before you sign
- Every finalist priced the same current scope, plans, and specifications.
- You verified the business identity, relevant license or registration, current status, and available public record with the proper authority.
- You checked applicable insurance and bonding evidence against local requirements.
- You spoke with recent references and assessed comparable work.
- You understand each bid’s materials, inclusions, exclusions, allowances, fees, proposed schedule, and subcontracted work.
- The person responsible for supervision and subcontractor coordination is clear.
- The contract records price, work, payment milestones, timing, permit responsibility, warranties, and written change approval.
- You checked local permit, contract, payment, and other legal requirements rather than relying on rules from another jurisdiction.
NSW Government guidance offers a further example of why location matters: its contract and insurance thresholds apply to residential building work in New South Wales, Australia, not universally. Confirm the rules that govern your own project with the relevant local authorities: Step by step guide to choosing the right tradesperson or builder.
Frequently Asked Questions
How do I choose a contractor for a major building project?
Define the work, interview multiple qualified candidates, verify identity and credentials with the relevant authority, check comparable experience and references, and compare complete written bids on the same scope. Then sign a contract that sets out work, price, payment milestones, timing, permits, warranties, and written change approvals.
What should I look for when hiring a contractor?
Look for relevant project experience, references you can contact, current credentials verified through the local or state authority, applicable insurance or bonding, a clear bid, a realistic schedule, and a defined plan for supervision and subcontractors. No single credential or low price guarantees quality.
How can I check whether a contractor is licensed?
Ask for the contractor’s legal business name and license or registration number, then check current status with the licensing authority for the place where the work will happen. Review public disciplinary or complaint information where available and check whether regulated trades require separate credentials. Verification tools and rules vary by jurisdiction.
How do I compare contractor bids?
Give each qualified candidate the same plans, specifications, and written scope, then compare inclusions and exclusions, materials, quantities, labor, subcontractors, allowances, fees, schedule, payment terms, warranties, and change procedures. Ask bidders to explain significant gaps or price differences; do not choose on the headline price alone.
What should be in a construction contract?
The written agreement should identify the parties and describe the scope, plans and specifications, materials, price, payment milestones, timing, permit responsibilities, supervision, subcontractor approach, and warranty terms. It should also require written approval of changes, including their price and schedule effects. Check local requirements, since required terms and payment rules differ.
Should I pay a contractor upfront?
Do not make an upfront payment without a signed contract. Tie payments to defined progress under the agreement, keep invoices and receipts, and check applicable local payment rules. Payment caps and requirements are not universal.
The Bottom Line
Choose the contractor whose credentials and relevant experience you can verify, whose references and bid withstand scrutiny, and whose responsibilities and payment terms are clear in writing. Compare candidates on a common scope, resolve exclusions and uncertainties before signing, and confirm local licensing, permit, insurance, contract, and payment requirements with the authorities that govern your project.
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