How to Vet a Contractor Before Hiring

Hiring a contractor for a renovation, repair, or building project is one of the largest financial commitments most homeowners make outside of buying the property itself. The stakes are high: a good contractor delivers quality work on time and on budget; a bad one can cause costly damage, endless delays, and legal headaches. The difference between the two outcomes almost always comes down to how thoroughly you vet the contractor before signing anything.

This guide walks you through a rigorous vetting process that protects your money, your property, and your sanity.

Why Vetting Matters

The home improvement industry attracts skilled professionals and unscrupulous operators in roughly equal measure. Horror stories abound: half-finished projects, substandard workmanship, contractors who disappear with deposits, and repairs that create new problems. The good news is that nearly all of these outcomes are preventable with proper due diligence.

Vetting is not about being suspicious - it is about being smart. Reputable contractors expect questions and are happy to provide documentation. Those who resist scrutiny are telling you something important.

Step 1: Verify Licences and Registrations

Licensing requirements vary by jurisdiction, but in most places, contractors performing structural, electrical, plumbing, or significant renovation work must hold a valid licence.

• Ask for the licence number and verify it independently through your local licensing authority's website or office.
• Check that the licence is current - not expired, suspended, or revoked.
• Confirm the scope: A general contractor's licence may not cover specialist work like electrical or plumbing. Make sure the licence covers the specific type of work you need.
• Look for complaints: Many licensing bodies maintain public records of complaints, disciplinary actions, and resolved disputes.

An unlicensed contractor may charge less, but you lose all consumer protections, warranty coverage may be void, and your home insurance could deny claims related to unlicensed work.

Step 2: Confirm Insurance Coverage

A contractor should carry, at minimum, two types of insurance:

General Liability Insurance

This covers damage to your property caused by the contractor's work. If a painter spills a tin through your floor or a plumber floods your kitchen, liability insurance pays for the repair. Without it, you would have to pursue the contractor personally - often an expensive and fruitless endeavour.

Workers' Compensation Insurance

This covers injuries to the contractor's employees while working on your property. Without it, an injured worker could sue you as the property owner. This is not a theoretical risk - it happens regularly.

Ask for certificates of insurance and verify them directly with the insurance company. A Certificate of Insurance (COI) should list you as a certificate holder. Do not accept photocopies or documents you cannot verify.

Step 3: Check References and Past Work

Ask for at least three references from recent projects similar to yours. When you contact references, ask:

• Was the project completed on time?
• Was it completed on budget, or were there significant cost overruns?
• How was the quality of workmanship?
• How did the contractor handle problems or unexpected issues?
• Was the contractor easy to communicate with?
• Were there any issues after the project was completed? If so, how were they resolved?
• Would you hire this contractor again?

If possible, visit a completed project in person. Photos are helpful, but seeing the work firsthand gives you a much better sense of quality, attention to detail, and finish.

Online Reviews

Supplement references with online reviews, but read them critically. A handful of bad reviews among many positive ones may reflect difficult customers rather than a bad contractor. Patterns of complaints - repeated mentions of delays, poor communication, or substandard work - are the real warning signs.

Step 4: Get Multiple Detailed Quotes

Obtain at least three written quotes for your project. A proper quote should include:

• A detailed scope of work - what will be done, in what order, and to what standard
• Materials specifications (brand, grade, quantity)
• Labour costs broken down by task
• A realistic timeline with start and completion dates
• Payment schedule tied to milestones
• Warranty terms for both labour and materials
• Process for handling changes (change orders)

Be wary of quotes that are significantly lower than others. An unusually cheap quote often means the contractor is cutting corners on materials, using unqualified labour, or planning to inflate the price with change orders once work is underway.

Step 5: Review the Contract Thoroughly

Never start work without a detailed written contract. A handshake agreement offers no protection. The contract should include everything from the quote plus:

• Permits: Who is responsible for obtaining building permits? (It should be the contractor.)
• Subcontractors: Will the contractor use subcontractors? If so, are they licensed and insured?
• Cleanup: Who handles debris removal and site cleanup?
• Dispute resolution: How will disagreements be handled - mediation, arbitration, or court?
• Termination clause: Under what conditions can either party end the contract, and what are the financial implications?
• Lien waiver: Protection against liens filed by unpaid subcontractors or suppliers.

Have a lawyer review the contract if the project is large. The cost of legal review is trivial compared to the cost of a contract dispute.

Step 6: Establish a Smart Payment Schedule

How you structure payments is one of your strongest protections against poor performance.

• Never pay the full amount upfront. A deposit of 10 to 30 percent is reasonable to cover initial materials.
• Tie payments to milestones: Pay as specific stages of work are completed and inspected.
• Hold back a final payment: Retain 10 to 15 percent until the project is fully complete, inspected, and you are satisfied with the work. This is your leverage to ensure punch-list items get addressed.
• Pay by cheque or bank transfer: Avoid cash payments, which are difficult to trace and document.

A contractor who demands a large upfront payment - especially in cash - is a significant risk. Walk away.

Common Scams and How to Spot Them

• The drive-by offer: Someone knocks on your door unsolicited, claiming they noticed a problem with your roof or driveway and can fix it cheaply because they are "already in the area." Legitimate contractors do not solicit work door to door.
• The disappearing deposit: The contractor takes a large deposit and either vanishes or delays indefinitely. This is why you verify credentials, check references, and keep deposits small.
• The ever-expanding scope: Once work begins, the contractor discovers one "unexpected" problem after another, each requiring additional payment. While genuine surprises do occur, a pattern of escalation suggests either incompetence or dishonesty.
• Permit avoidance: The contractor suggests skipping permits to "save time and money." Unpermitted work can create serious problems when you sell your home, make an insurance claim, or face a safety issue.

Red Flags Summary

Walk away if you encounter any of these:

• No licence, expired licence, or refusal to provide the number
• No insurance or fake certificates
• No references or references that cannot be verified
• Demanding large cash payments upfront
• No written contract or a vague one
• Pressuring you to decide immediately
• Suggesting you skip permits
• Cannot provide a physical business address

Taking the time to vet a contractor properly is one of the best investments you can make. It costs nothing but time, and it can save you thousands in avoided problems.

Building a Productive Working Relationship

Vetting gets you in the door with a good contractor. Building a strong working relationship keeps the project on track.

Communicate Regularly

Establish a communication rhythm - whether it is a daily check-in, a weekly meeting, or updates at each milestone. Regular communication catches problems early, prevents misunderstandings, and keeps both parties aligned on expectations.

Document Everything

Keep a written record of decisions, changes, and agreements. Email is ideal because it creates a timestamped trail. If the contractor suggests a material substitution or timeline change, confirm it in writing. This protects both parties if a dispute arises later.

Be Decisive

Indecision delays projects and increases costs. Make material selections, approve plans, and respond to questions promptly. A contractor who is waiting for your decision on tiles cannot proceed with tiling - and that delay ripples through the entire timeline.

Frequently Asked Questions

Answers to frequently asked questions about vetting contractors.