How to Vet and Hire a Home Contractor: Licenses, Insurance, Reviews & Red Flags

By the ProjectPriced Team · Updated September 2026 · Written to our editorial standards

Most disastrous home projects were decided the day the contract was signed, not the day the work went wrong. This is the seven-step vetting process that separates a licensed, insured, accountable pro from the guy who leaves you with a mechanic's lien and a half-finished kitchen.

The most expensive mistake in home improvement isn't overpaying. It's hiring the wrong person and finding out after the demolition is done — walls open, deposit paid, and switching now means eating the loss and starting over. Every hour spent vetting before you sign is worth ten hours of dispute afterward.

This is the due-diligence workflow you run before money changes hands. It's deliberately separate from our guides on how to read a contractor estimate and the signs a contractor is overcharging you — those help you judge the numbers. This one helps you judge the person and the paperwork behind them.

Step 1: Build a shortlist of five or six, not one

The biggest source of leverage in this whole process is having alternatives. A contractor who knows you're also talking to two others behaves differently from one who knows he's your only option. Aim for five or six names, expecting attrition — some won't call back, some are booked out six months, some you'll disqualify below.

Weight personal referrals heavily. A neighbor who can walk you through a basement the contractor finished two years ago is worth more than any five-star profile, because you're seeing durability, not a first impression. Ask friends, your real estate agent, and staff at a local lumberyard or specialty supplier — suppliers know who pays their bills. Fill out the list with directory listings, but treat those as leads to verify, not endorsements.

One quiet green flag: a good contractor with a real business is usually somewhat busy. If someone can start tomorrow and seems desperate for the job, ask why.

Step 2: Verify the license yourself — on the state board, not from a photo

A license number printed on a business card or texted to you means nothing until you have checked it against the issuing authority. Contractors do let licenses lapse, operate under a suspended license, or quote a number that belongs to someone else entirely. The verification takes about ninety seconds.

Most states run a free online "check a license" lookup. California's Contractors State License Board (CSLB), for example, lets you search by number or business name and returns the license status, expiration date, the classifications the contractor is allowed to work in, the bond on file, and — critically — any disciplinary actions, citations, or accusations on record. Confirm three things: the license is active (not expired or suspended), the name matches the business you're dealing with, and the classification covers your work (a licensed painter is not a licensed electrician).

The catch: roughly a third of states don't license general contractors at all

Here's the part most homeowners never hear. There's no federal contractor license, and licensing is wildly uneven state to state. Roughly a third of states have no statewide general-contractor license; regulation happens at the city or county level, or not at all for GCs. Colorado, for instance, doesn't issue a state general-contractor license — it's handled by individual municipalities. In these states the trades (electrical, plumbing, HVAC) are usually still licensed at the state level because life-safety is involved, even when the GC overseeing them isn't.

The practical rule: find out what your state and locality actually require before you judge a contractor for lacking a "state license" that may not exist. Search your state's licensing board plus your city or county building department. Where no GC license is required, licensing gives you zero protection and you must lean harder on Steps 3 through 6 — insurance, complaint history, references, and the contract.

Step 3: Verify insurance — get the COI directly from the insurer

This is the step people skip and regret most, because uninsured work turns a bad renovation into a financial catastrophe. Two coverages matter:

General liability (GL) — pays if the contractor damages your property or a third party: a nail through a gas line, a dropped load that cracks your driveway, water damage from an open roof in a storm. Typical policies carry $500,000 to $1,000,000 per-occurrence limits; for anything beyond minor work, look for $1,000,000.
Workers' compensation — pays medical bills and lost wages if a worker is injured on your property. This is the one that can reach into your own pocket: if an uninsured worker falls off your roof, you — the property owner — can be sued directly for the medical costs and lost income, and your homeowners policy may not cover a hired worker. The contractor's workers' comp moves that risk off you entirely.

Don't accept a screenshot or a PDF the contractor emails you. Ask for a Certificate of Insurance (COI) sent directly by their agent or carrier, and — for larger jobs — ask to be named as a certificate holder so the insurer notifies you if the policy lapses. A COI from the source confirms the policy is real, active today, and not a cancelled document dressed up to look current; it lists the insurer, policy numbers, coverage types, limits, and effective dates. Cross-check that those dates cover your entire project window. The FTC's guidance is to hire only licensed, insured contractors and to insist on that certificate.

Step 4: Read reviews skeptically, then call references you pick yourself

Online reviews are a screening tool, not a verdict. Treat them the way a good editor treats a source — useful, but assume some are planted and some are score-settling.

Read the middle, not the ends. The 5-star reviews may be solicited or fake; the 1-star reviews are sometimes a single unreasonable customer. The 3- and 4-star reviews, and how the contractor responded to complaints, tell you the most about how they behave when something goes wrong — which it always does on some line item.
Check the complaint history, not just the rating. Look the business up on the Better Business Bureau for its pattern of complaints and whether they were resolved, and re-check the state board disciplinary record from Step 2. A contractor can hold a 4.6 on Google and still have a string of unresolved board complaints.
Watch for review patterns. Ten glowing reviews all posted the same week, all first-time reviewers, all generic ("great job, highly recommend!") is a manufactured reputation. Detailed reviews that name the project and the crew are more trustworthy.

Then do the thing almost no one does: ask for three references and actually call them — a recent job, one from two-plus years ago (for durability and warranty follow-through), and one similar to yours. Ask: Did the final price match the estimate, and if not why? Did they stay on schedule? How did they handle a problem or change order? Would you hire them again — and can I drive by and see the work? Those five answers predict your experience better than any star rating.

Step 5: Interview the finalists with questions that reveal process

By now you should have two or three survivors. Ask questions that expose how they run a business, not just whether they seem nice:

Who is actually on my job — your employees or subcontractors — and are the subs licensed and insured too? (Subs create lien exposure; see Step 6.)
Will you pull the required permits, and will inspections be in your name or mine? A contractor who wants you to pull the permit is often trying to dodge liability — a red flag.
What is your payment schedule, and what triggers each payment? (You want milestones tied to completed work, not a calendar.)
How do you handle change orders and unexpected conditions? Get "in writing, priced, signed before work proceeds" as the answer.
What's your warranty on labor, and how do I reach you after the job is done?

You are listening for specific, unbothered answers. Vague, irritated, or evasive responses to reasonable business questions tell you how disputes will go later.

Step 6: Nail the contract essentials — and understand lien risk

Never proceed on a handshake, a verbal quote, or an email thread. A real contract protects both sides and is itself a sign you are dealing with a professional. Insist on these clauses:

Clause	What it should say	Why it matters
Scope of work	Detailed description of work, materials, brands, model numbers, and quality grades	"Install cabinets" invites substitution of cheaper goods; specifics prevent it
Total price & payment schedule	Fixed price or clear allowances; payments tied to completed milestones	Milestone payments keep you from paying ahead of the work
Deposit	Reasonable — commonly 10–33%; some states cap it (California caps home-improvement deposits at 10% or $1,000, whichever is less)	A large upfront demand is the classic funding-the-runaway pattern
Timeline	Start date, substantial-completion date, and how delays are handled	Gives you a reference point if the job stalls
Change orders	All changes priced and signed in writing before work proceeds	Stops "while we were in there…" cost creep
Lien waivers	Contractor provides signed lien waivers from subs and suppliers with each payment	Your single best defense against paying twice — see below
Warranty & cleanup	Labor warranty term; who hauls debris; final-payment held until punch list is done	Keeps leverage until the work is truly finished

The mechanic's lien trap: how you can pay twice

This is the risk most homeowners have never heard of until it happens to them. A mechanic's lien lets anyone who supplied labor or materials to your project — a subcontractor, a lumberyard, an electrician the GC hired — file a claim against your house if they aren't paid. Here is the trap: paying your general contractor in full does not extinguish those rights. If you pay the GC and the GC fails to pay the drywall sub, the sub can lien your home, and you may be forced to pay the sub directly — a second time for the same work — or, in the worst case, face foreclosure on the lien.

The protection is lien waivers. With each payment, require the contractor to hand you signed waivers from every sub and supplier acknowledging they were paid for that portion. No waiver, no next check. Collecting waivers as you go is the standard, unglamorous practice that keeps you from paying for the same drywall twice.

Step 7: Walk-away red flags — no exceptions

Some behaviors are not negotiating points; they are exits. Any one of these should end the conversation, no matter how good the price sounds:

Cash only, or a big discount "for cash." Cash leaves no paper trail, usually means no license or insurance, and gives you nothing to dispute or claw back.
No written contract, or pressure to start on a verbal agreement "to save time."
A large upfront deposit — anyone demanding 50% or more before materials are ordered is often using your money to finish someone else's job, and may vanish.
Door-to-door solicitation, especially right after a storm ("we noticed your roof from the street"). Storm-chasing outfits appear, take deposits, and leave.
Unmarked truck, no local address, mobile-only number, or a company name you can't find registered anywhere. You need to be able to find them after the job.
High-pressure "today only" pricing or refusal to give you time to verify anything.
"Leftover materials from another job" at a special price — a classic scam script.
Won't provide license, insurance, or references when asked plainly. A professional expects these questions.

The honest caveat: a great contractor might have one mild quirk — a slightly larger deposit because materials are custom-ordered, say — and that alone isn't disqualifying if everything else checks out. The red flags above are most dangerous in combination. Cash-only plus no contract plus door-to-door is not a bargain at any price; it's the setup for the exact loss this guide exists to prevent.

Run these seven steps and you'll have out-vetted the vast majority of homeowners. When you're ready to line up quotes from vetted pros, get quotes here, and to sanity-check the numbers that come back, our how we estimate methodology shows how we build the cost ranges on this site.

Frequently asked questions

Is it ever okay to hire an unlicensed contractor?

In states or trades that don't require a license, "unlicensed" may simply be legal and normal — but you then have no board to complain to, so insurance, references, and a strong contract become non-negotiable. Where a license is required, hiring unlicensed is a serious mistake: you often lose warranty rights, may be liable for injuries, and have little recourse if the work fails inspection or the contractor disappears.

How much deposit is reasonable?

For most projects, 10–33% is normal, and it should be tied to mobilizing the crew and ordering materials. Some states cap it — California limits home-improvement deposits to 10% of the contract or $1,000, whichever is less. Treat any demand of 50% or more before work begins as a red flag, not a norm.

What exactly is a Certificate of Insurance and why can't I just take the contractor's word?

A COI is a one-page summary from the contractor's insurer listing their active policies, coverage types, limits, and dates. You want it sent directly by the agent or carrier because a document the contractor forwards could be edited, expired, or cancelled. Direct delivery confirms the coverage is real and in force today.

What do I do if a subcontractor files a lien even though I paid the contractor?

First, don't release final payment until you have lien waivers from all subs and suppliers — prevention is far easier than cure. If a lien is already filed, contact the contractor in writing to resolve it immediately, and consult a construction attorney in your state, since lien deadlines and dispute procedures are state-specific and time-sensitive. In many cases you can be forced to pay the unpaid party to clear the lien from your title.