Crawl space vapor barrier in Santa Maria CA - ground covered, water handled first

Most calls start with something you notice upstairs, like cold floors or a musty smell, or with someone who went under the house and found bare dirt or old torn plastic. The price turns on how big the crawl space is, how much has to come out before the plastic goes down, and whether you keep it vented or have it closed up. The schedule mostly depends on whether there's a water problem to fix first and whether the building office wants a permit. When I come out, I crawl the space and write you an estimate for your house, and if your floors run cold we can talk about crawl space insulation on the same visit.

A liner can't fix water running in from the yard, so I start outside and look at how the ground slopes and where water drains around the house. Then I go under and see what's down there, from old plastic and stored boxes to damp spots and any furnace or water heater. If water is getting in, that gets dealt with first, because plastic laid over a wet problem only hides it. After that our crew clears the space, lays the plastic over the dirt and seals the seams and edges. If you'd rather have the crawl space closed up than vented, we also plan for drying the air down there and for any gas appliance under the floor, since sealing the space changes how both behave.

If you need a moisture layer somewhere other than the crawl space floor, like a wall or a ceiling, that's our vapor barrier installation work. Damp air below and leaks up top often go together, so some homeowners pair this job with attic air sealing, which closes the gaps around lights, pipes and the hatch.

Permits inside the city go through Santa Maria's Building and Safety Division, where permit technicians can give fee estimates and general rules on timelines. I won't guess whether a liner on its own needs a permit at your house, especially if we're also closing the crawl space up or working around a gas appliance. Before work starts, we check with the building office that covers your address, city or county, and if they say a permit is needed, we take care of the application and set up the inspections. If you want to know what's been done to your house before, the city's permit staff can share its permit history, which helps when the plastic down there looks older than you expected. A permit also affects who's allowed to do the work, which I cover in the questions below.

We're based in Santa Maria and work across the cities around it in northern Santa Barbara County and southern San Luis Obispo County. Under a lot of older raised-floor houses we find torn or missing plastic, boxes stored on bare dirt and a gas furnace or water heater right where sealing would affect it, and we run into the same things on jobs in Orcutt and Nipomo.