How to Pick a Concrete Contractor Who Won’t Leave You With Cracks

A bad concrete pour costs you twice: once for the original job and again when you pay someone else to tear it out and do it right. Driveways, patios, and foundations are not places to gamble on the lowest bid from a guy with a truck and a business card he printed that morning. This guide breaks down exactly what to check before you sign a contract, so you spend money once.

Start With the License, Not the Logo

Every state handles concrete and general construction licensing differently, so the first step is finding your state’s contractor licensing board website and searching the business name, not just the salesperson’s name. A legitimate contractor will give you their license number without hesitation. If they hedge or tell you “we work under another company’s license,” that’s your answer.

Confirm the license is active, not expired or suspended.
Check for a bond. Most states require a surety bond between $5,000 and $20,000 for contractors, which protects you if they abandon the job or do defective work.
Ask for proof of general liability insurance, ideally $1 million in coverage, and workers’ compensation if they have employees. Without workers’ comp, you could be liable if someone gets hurt on your property.
Call the insurance carrier listed on the certificate to confirm the policy is current. A certificate from last year means nothing.

Search the contractor’s name plus “complaint” or “lawsuit” in your state’s consumer protection database. A few resolved complaints over a decade in business isn’t alarming. A pattern of nonpayment disputes or unfinished jobs is.

Collect Bids That Can Actually Be Compared

Three bids ranging from $4,800 to $11,000 for the same 500-square-foot patio usually means the contractors aren’t bidding the same job. Before you ask for numbers, write down exactly what you want: square footage, thickness, finish type (broom, stamped, exposed aggregate), and any reinforcement you expect. Give every bidder the same scope so you’re comparing apples to apples.

Ask each bid to break out materials, labor, demolition or excavation, and disposal fees separately.
Confirm whether the price includes a vapor barrier under slabs that will be heated or carpeted.
Check if permit costs and fees are included or billed separately. A driveway or structural slab typically requires a permit in most municipalities, and skipping one can create problems when you sell the house.
Ask about the payment schedule. A deposit of 10 to 30 percent is standard. Be wary of anyone asking for more than half upfront or for cash only with no invoice.

A bid that’s dramatically lower than the others usually means thinner slabs, lower-strength mix, no rebar where it’s needed, or a crew that’s going to disappear halfway through. Ask the low bidder directly what they cut to hit that number.

Know What’s Actually in the Mix

Concrete isn’t one product. The mix design determines whether your driveway lasts 30 years or spalls apart after two winters. You don’t need to be an engineer, but you should know enough to ask informed questions and read a delivery ticket.

Compressive strength: Residential sidewalks and patios typically use 3,000 PSI concrete. Driveways and anything that sees vehicle weight should be at least 4,000 PSI. Garage floors and areas with heavy freeze-thaw cycles often call for 4,500 PSI.
Air entrainment: In climates with freezing winters, the mix needs 5 to 7 percent entrained air. This creates microscopic pockets that let water expand without cracking the slab. Skipping this in a cold-weather region is one of the most common causes of surface scaling.
Slump: This measures how wet the mix is. A slump of 4 to 5 inches is typical for flatwork. Anything much higher means extra water was added at the site to make pouring easier, which weakens the final strength. Ask to see the slump test, or at least ask if one was done.
Rebar or mesh: Driveways and structural slabs should have rebar, typically No. 3 or No. 4 bars on an 18- to 24-inch grid, not just wire mesh laid on the ground and hoped into place. Mesh that isn’t lifted to the middle of the slab during the pour does almost nothing.
Thickness: A standard driveway slab should be 4 inches thick, 5 to 6 inches if it will carry trucks or RVs. Ask how they’ll verify thickness during the pour, not just promise it on paper.

Ask your contractor for the actual batch ticket from the concrete supplier on pour day. It lists the mix design, PSI, slump, and batch time. If they can’t produce one, they may be using whatever mix was cheapest that morning.

Red Flags During the Pour Itself

Most of what determines whether concrete lasts happens in the hours around the pour, not months later. If you can be present, here’s what separates a careful crew from a rushed one.

Pouring on top of unprepared, uncompacted soil instead of a proper gravel base, typically 4 to 6 inches of compacted crushed stone for a driveway.
No control joints cut within the first 6 to 12 hours. Without joints every 8 to 10 feet, the slab will crack wherever it wants instead of where you planned.
Finishing crew adding water to the surface to make it easier to trowel. This weakens the top layer and leads to dusting and flaking within a year or two.
Pouring in direct sun above 90 degrees or in freezing temperatures without any temperature protection plan, like blankets, retarders, or accelerators adjusted for the weather.
No curing method applied. Concrete needs to stay moist for at least 7 days to reach proper strength. A crew that pours and leaves the same afternoon without a curing compound or covering is setting you up for a weaker, more porous slab.
Forms that look crooked, poorly staked, or clearly rushed. Sloppy formwork almost always predicts a sloppy finish.

If a contractor gets defensive when you ask to watch the pour or ask about any of these steps, treat that as information. Good crews are usually happy to explain what they’re doing, because they’re proud of the process.

Questions to Ask Before You Sign Anything

A short conversation here saves months of frustration later.

How many years have you been pouring concrete specifically, not just general contracting?
Can I see two or three addresses of work you completed at least three years ago? Fresh concrete always looks good. You want to see how it held up.
What’s your plan if it rains the day of the pour?
Who do I call if I notice a problem six months from now, and what does the warranty actually cover?
Will the same crew that quoted the job be the one pouring it, or is work subcontracted out?

Get the warranty in writing. A reasonable warranty covers structural cracking and settling for one to two years. Be skeptical of anyone offering a “lifetime” warranty with no specifics about what’s excluded, since surface cracks from normal shrinkage are common and usually not covered by anyone.

Your Next Step

Write down your project scope, pull your state’s contractor license lookup tool, and request three detailed written bids using the exact same specifications. If you’re in the South Puget Sound area and want a reference point for what a properly licensed, insured crew looks like, Tacoma Concrete Contractors is a reasonable starting point for comparing bids against. Once you have your bids side by side, call the contractor whose numbers make sense and whose answers to the questions above didn’t make you uneasy, and ask for the job to start within the next available weather window rather than months out. The contractor willing to answer every question clearly is usually the one who won’t need to hide anything once the truck shows up.