ultimate-guide
Questions to Ask Before Hiring Contractors
Table of Contents
- Questions to Ask Before Hiring Contractors: A Practical Vetting Guide
- How to Verify Contractor Insurance and Licensing
- Contractor Interview Checklist: Experience and Specialization
- What to Include in a Contractor Estimate
- Setting a Contractor Payment Schedule and Safeguards
- Discussing Project Scope, Timeline, and Change Orders
- Warranties, Guarantees, and Post-Project Support
- Red Flags and Warning Signs During Contractor Vetting
- Frequently Asked Questions
Last Updated: October 12, 2026
Questions to Ask Before Hiring Contractors: A Practical Vetting Guide
Hiring the wrong contractor can cost you thousands in repairs, delays, and frustration.
This guide covers the essential questions to ask before hiring contractors: verifying credentials, evaluating experience, reading estimates, and structuring payments and contracts to protect yourself.
How to Verify Contractor Insurance and Licensing
Before anything else, confirm your contractor is licensed and insured. This isn't optional, it's your legal protection.
What coverage types matter most
Two types of insurance matter: general liability (damage to your property or injuries during the work) and workers' compensation (injuries to the crew).
Ask for proof of both, never a verbal confirmation. Request the certificate from their carrier and check expiration dates; expired coverage is worthless.
For larger projects like roofing or siding, ask whether they carry bonding.
Steps to confirm active license and insurance
Ask for their license number, then verify it on your state licensing board's searchable database to confirm it's active and in good standing.
For insurance, call the insurer listed on the certificate to verify coverage is current.
Real Property Industries, LLC maintains active licensing and insurance in our service area and encourages homeowners to verify this independently.
Contractor Interview Checklist: Experience and Specialization
Experience matters, but the right kind matters more. A contractor with 15 years of general construction may not fit a specialized roofing project.
Years in business and relevant project history
A contractor with seven years of general experience but only two roofing projects isn't as strong as one with five years and dozens of roofing jobs.
Ask about the materials they work with. Roofing materials vary, asphalt shingles, metal, slate, tile, and not all contractors are equally skilled with each.
Checking references and past work
Ask for at least three references from recent projects and call them. Ask: Did they show up on time?
Ask to see photos of past work, or better, drive by a completed project.
Pay attention to how they discuss past projects. Do they take responsibility or blame clients and suppliers?
What to Include in a Contractor Estimate
A vague estimate is a red flag. A solid estimate breaks down exactly what you're paying for.
Breaking down materials, labor, and permits
A professional estimate separates materials, labor, and permits into distinct line items.
Labor should include a clear scope: "Remove existing roof, install underlayment, install new shingles, haul debris", not just "labor, $4,000."
Permits and inspections should be listed separately. Ask who's responsible for pulling permits, some include it, others charge separately.
Comparing bids and spotting unusually low offers
Get at least three estimates to understand the market rate and spot outliers.
If one bid is 30% to 50% lower, ask why.
Watch for vague line items like "miscellaneous" or "contingency", signs the contractor hasn't thought the project through.
Ask whether the estimate includes cleanup and debris removal. Some charge extra; knowing upfront prevents surprises.
Setting a Contractor Payment Schedule and Safeguards
How and when you pay matters as much as how much. Most disputes start with money changing hands before the work, materials, or paperwork justify it.
Reasonable deposit and milestone payments
A reasonable deposit is typically 10% to 25% of total project cost, covering initial materials and scheduling.
Structure payments around milestones, not time. Instead of "50% upfront, 50% at completion," tie payments to verifiable progress:
- 10%-25% at signing to mobilize and order materials
- 25% when framing, rough-in, or demolition is complete and inspected
- 25% when rough work passes inspection or drywall is hung
Never pay the final payment until you've inspected the finished work and all punch-list items, small fixes that weren't right on first pass, are complete.
Lien waivers, joint checks, and receipts
This is where most homeowners get surprised. In most states, unpaid subcontractors and suppliers can file a mechanic's lien against your property even if you paid the general contractor in full.
Protect yourself with three tools:
Conditional lien waivers. Before each progress payment, have the contractor and any major subcontractors or suppliers sign a conditional lien waiver: "When this check clears, we waive our lien rights for work through this date." Once it clears, it becomes unconditional. Get waivers from every party who could file a lien.
Joint checks. On larger projects, write a single check payable to both the general contractor and a key subcontractor or supplier.
Receipts and a paper trail. Never pay cash without documentation.
Red flags in payment requests and contract terms
Avoid contractors who demand full payment upfront. This shifts all risk to you. If they disappear or do poor work, you have no recourse.
Watch for vague payment terms. "Payment due upon completion" sounds straightforward but can be disputed.
Other payment red flags:
- Requests to pay in cash only, or to make checks out to an individual rather than the business
- A sudden request for an extra deposit mid-project with no change order to justify it
- Pressure to pay before an inspection passes or before you've seen the work
A contractor who resists putting terms in writing is a red flag.
Discussing Project Scope, Timeline, and Change Orders
Scope creep, where the project gradually expands beyond the original plan, is one of the most common sources of contractor disputes.
Start date, completion date, and handling delays
Get specific dates in writing. "Starting next month" isn't specific enough. Get the actual start date and a realistic completion date.
Ask how delays are handled. Will weather delay the project?
Ask about crew size and whether they'll work on your project full-time or part-time. A full-time crew typically means faster completion.
How change orders work and who approves scope changes
A change order is a written request to change the original scope, add work, remove work, or change materials. Get the process in writing before work starts.
Any change order should come in writing with a revised estimate before work begins. Verbal agreements lead to disputes.
Agree on who can approve change orders.
Warranties, Guarantees, and Post-Project Support
Ask what warranty the contractor offers on workmanship.
Understand what the warranty covers. Labor only, or materials too? If materials fail, is the contractor responsible or is it the manufacturer's warranty?
Ask what happens if something goes wrong after completion. Will the contractor come back to fix it, or will you hire someone else?
Red Flags and Warning Signs During Contractor Vetting
Certain warning signs should make you reconsider a contractor entirely. Treat red flags as data points you document, not just gut feelings, if a dispute arises, your notes and paperwork protect you.
Behavioral red flags
A contractor who can't provide references or gets defensive when asked is suspicious.
Resistance to written contracts is a major red flag. Legitimate contractors expect contracts.
Pressure to decide quickly or pay upfront is another warning sign.
If a contractor can't clearly explain their process, timeline, or pricing, that's a problem.
Answer red flags: what a concerning response sounds like
Some red flags show up in the answers themselves, not the behavior. Watch for these patterns:
- Vague licensing answers. "We're licensed" without a number, or "we don't need a license for this" when your state clearly requires one for the trade. Ask for the number and verify it.
- Insurance deflection. "Our guys are covered" without a certificate, or a certificate that lists a different company name than the one you're hiring. Ask the insurer to confirm the named insured matches the contracting entity.
- Scope hand-waving. "We'll figure out the details as we go" or "that's all included" without a written line item. Get it in the estimate or it isn't included.
Documenting your decision and preventing disputes
Before you sign, build a simple project file. It takes minutes and pays off if anything goes sideways:
- Save every estimate and bid you receive, with the date and the contractor's name.
- Keep a copy of the license verification, a screenshot of the state database showing active status, with the date you checked.
- File the certificate of insurance and note the date you called the insurer to confirm it.
- Keep your reference-call notes, who you spoke with, what they said, and whether they'd hire the contractor again.
- Store the signed contract, change orders, payment log, and lien waivers in one place.
If a disagreement starts, put your concern in writing, email or text is fine, and reference the contract clause or estimate line it relates to. A calm written record gives the contractor a chance to fix the issue and creates a timeline you can rely on if you escalate.
When to walk away
Some situations aren't worth negotiating. Walk away if the contractor:
- Won't provide a license number or proof of insurance
- Refuses a written contract or a milestone-based payment schedule
- Demands a large upfront payment or cash with no receipt
There are always other contractors. Restarting your search costs far less than a bad project.
Frequently Asked Questions
What questions should I ask a contractor before hiring them?
Start with credentials: ask for proof of license, insurance, and bonding. Request references from recent projects similar to yours. Ask about years in business, how they handle delays, what's included in the written estimate, and their warranty on completed work. Discuss the payment schedule upfront and confirm they'll pull necessary building permits. Ask how they manage change orders and communicate during the project.
How do I verify a contractor's license and insurance?
Request their license number and verify it directly with your state's licensing board or contractor regulatory agency, do not rely on their word alone. Ask for current certificates of insurance showing general liability and workers' compensation coverage, then contact the insurance company to confirm the policy is active. Bonding can be verified through your state's contractor board. A licensed contractor should provide this documentation without hesitation.
What should be included in a contractor estimate?
A detailed written estimate must itemize materials, labor costs, permit fees, and any subcontractor costs separately. It should specify the project scope, start and completion dates, payment schedule, and terms for change orders. The estimate should also clarify what's included (cleanup, debris removal) and what isn't. Compare multiple estimates carefully, if one is significantly lower, ask why before assuming it's a better deal.
What is a reasonable contractor payment schedule?
A standard schedule often includes a deposit to start, milestone payments as work progresses, and final payment upon completion. Never pay the full amount upfront, this is a major red flag. Avoid contractors who demand large deposits before providing a written contract. Tie each payment to completed work phases, and hold back a portion as final payment until you've inspected the finished project and any punch-list items are addressed.
What are red flags when hiring a contractor?
Avoid contractors who won't provide references, insurance, or a written estimate. Be wary of pressure to decide quickly, requests for large upfront payments, unwillingness to discuss timelines or change order procedures, and no local business address. If they can't explain what's in their estimate or seem evasive about licensing, move on. Contractors who won't put terms in writing or guarantee their work are high-risk choices.
How many contractor references should I check?
Request at least three recent references from projects similar in scope to yours. Contact each one and ask about the quality of work, whether the project stayed on schedule and budget, and if the contractor handled issues professionally. Ask if they'd hire the contractor again. References should be from completed projects within the last 1-2 years, not from years ago when standards or practices may have differed.
