Westlake Village contracts with the county for its building and safety work, so building, grading and encroachment permits come from Los Angeles County Public Works after county and city staff review the plans side by side. Encroachment permits cover work that reaches into the street or public sidewalk. Patios, pools, decks and similar backyard work also go through the city's Planning Department for a Zoning Clearance, a short check that the plan fits the zoning, and the city takes the residential version online only. A job that needs either approval can't start until it's approved, so the review sets the calendar. The city doesn't issue business licenses, so the license worth checking on any contractor here is the state one.
If your job needs a permit, I'll tell you at the estimate, and we take care of the application and inspections with the office that issues it, the same as we do back home in Port Hueneme and in nearby cities like Thousand Oaks and Agoura Hills. The price moves with the size and thickness of the slab, how much old concrete and soil we haul out, how much base the slope calls for, and the finish, from a plain broom finish that gives your shoes and tires grip to a stamped pattern. Rebar adds to it too, since that's the steel inside that holds the slab together if it cracks. The schedule turns on any permit review and on curing, the days concrete needs to gain strength before you use it, and your written estimate gives you your own figure with everything it includes.