Concrete is one of the trades where the work you are buying gets buried before you can inspect it. Once the slab is poured, nobody can see the base, the compaction or where the steel actually sat. That makes who you hire matter more here than in trades where the work stays visible, so here is what is worth checking and what the checks actually tell you.
Verify the license yourself, it takes two minutes
California contractors are licensed by the Contractors State License Board, and anyone can look up any license for free on the CSLB website. You need the license number, which every legitimate contractor will give you without hesitating.
What the lookup shows you is worth knowing. The legal business name, whether the license is current and active, the classification, the bond, and whether workers compensation coverage is on file. It also discloses certain complaint history. If a contractor is reluctant to give you a number, that reluctance is your answer.
Ours is 1137822 if you want to see what a normal record looks like.
What a classification actually means
California licenses are classified by trade, and the classification tells you what that contractor is licensed to do. Concrete work is C-8. A general building contractor holds a B. Excavation and grading is its own classification again.
This matters more than people realize. Work that is genuinely part of a concrete job, digging to grade for the slab you are about to pour, is normal under a C-8. But if somebody is selling you standalone grading, or structural work well outside concrete, it is fair to ask which classification covers it. A contractor who is straight with you about the edges of their license is telling you something useful about how they operate generally.
The bond is not insurance for you
Every licensed contractor carries a contractor’s bond, and it gets misunderstood constantly. It is a consumer protection mechanism with a limit, not a policy that covers damage to your property. What you actually want to confirm separately is general liability coverage and, if anyone will be working on your property, workers compensation. Ask for certificates. A real contractor sends them over without drama.
Questions that separate the bids
When you have two numbers in front of you and they are far apart, the difference is almost never the concrete. It is what is underneath and how much of it there is. These questions surface that.
- How thick, and why that thickness? The answer should reference what parks on it, not what is typical.
- What are you doing to the base? Listen for cutting to grade, correcting soft spots, and compacting in lifts. Dumped and raked flat is not base preparation.
- What reinforcement, and how is it held up? Steel only works where it actually sits. If nobody mentions chairs or how the bar gets lifted into the slab, ask.
- Where are the joints going and when will they be cut? A contractor who has thought about the joint layout before the pour is a contractor who has thought about where your slab is going to crack.
- What happens to the old concrete? Removal and haul off is real work and real cost, and it should be in the number rather than a surprise.
- Who is actually on site? Worth knowing whether the person quoting is the person pouring.
Why the cheap bid is usually cheap
There is not much room to be clever with concrete pricing. The material costs what it costs and the labor takes the time it takes. When a number comes in far under everyone else, the savings are generally in thickness, in reinforcement, or in the base, and all three are invisible the day the job finishes.
That is the hard part about this trade. A slab poured four inches thick on properly compacted base and a slab poured thin on whatever was already there look identical for the first two years. The difference shows up in year five, and by then the bid you accepted is a distant memory and the driveway is the problem in front of you.
Get it in writing and get it specific
A proposal should say what is being built, what thickness, what reinforcement, what is happening to the base, what finish, where the joints go, and what is being removed and hauled. Vague scope is where disagreements come from later, and a contractor who writes it plainly up front is usually the one who intends to do it.
What we would tell you even if you hire somebody else
Have somebody stand on the job before you accept a number. Concrete cannot be priced accurately off a photograph, because the things that decide the work are the soil, the drainage, the access and what is already there. Anyone willing to quote your driveway sight unseen is quoting a guess, and the guess gets corrected later at your expense.
Ask what happens if it cracks. Every slab eventually does something, and the useful answer is not a promise that it never will. It is a contractor explaining control joints and telling you where they intend the cracking to go.