Before we schedule anything here, we find out who issues permits for your address, because Contra Costa County runs building permits and inspections for its unincorporated addresses while the cities around it run their own departments. The county's CCMAP map tool shows which office covers your address, and if your job needs a permit, we take care of the application and plan the dates around it, so that check is usually the first thing that can move a schedule. When you're comparing contractors, you can ask each one for a current California contractor license and, if they work in the unincorporated county, a Contra Costa County business license.
The price mostly comes down to the slab, meaning how much grinding it needs, whether there are cracks, old coatings or glue to remove, and which system fits how you use the floor. The size of the space and how hard it is to get equipment in matter too, which counts for a lot in shared garages and buildings around the BART station, and coatings need time to cure before anyone walks or drives on them. Your written estimate puts all of that into a number with the reasons, and we do the same work next door in Walnut Creek and Pleasant Hill and out in Clayton.