Once a slab is poured, everything that determines its lifespan is buried under it. That makes comparing contractors difficult, because the parts that matter are invisible by the time you can inspect the work.
1. How deep is the base and what material?
You want a specific number and a specific material. Vague answers here are the clearest warning sign in the trade.
2. Who is actually on my job?
In-house crews and rotating subcontractors produce different results, especially on finish work. Ask whether the people who quote the job are the ones who pour it.
3. When will the joints be cut?
Control joints need to be cut within roughly 24 hours, sometimes sooner in hot weather. A contractor who has not thought about the timing has not thought about crack control.
4. What is the warranty and what voids it?
Ask for it in writing, and read what is excluded. Hairline shrinkage cracks are normal and typically excluded everywhere. Settlement and heaving should not be.
5. Are you licensed and insured, and can I see the certificate?
A real contractor produces both in a minute. Verify the license number with your state or municipal licensing board rather than taking it at face value.
6. What happens if the weather turns?
There should be an answer about temperature limits, rain protection and how rescheduling works. Concrete poured in the wrong conditions cannot be fixed later.
7. Can I see a job you poured five years ago?
Fresh photos look good universally. A slab that has been through five winters tells you everything.
