Slab foundation building in Lomita CA - a slab matched to the ground under your house

A home foundation slab of about 1,200 to 2,500 square feet usually runs about $20,000 to $60,000 per job in the Los Angeles area, according to one local cost guide. Where your job lands depends on the slab's size, your soil and the slab type it calls for, the dig and base work and how easily the trucks can reach the pour. Your free written estimate breaks those out so you can see what you're paying for.

A post-tensioned slab pays off most on soil that shrinks and swells, so whether it's worth it comes down to the ground under your lot. A post-tensioning trade group says these slabs outperform plain slabs on that kind of soil, while one slab design firm says stable, even ground lowers the movement risk that makes post-tensioning most valuable. Across Los Angeles County, 73% of the mapped soil is rated low for shrink and swell, which is why I look at your lot before recommending either one.

Type your address into the state's EQ Zapp map to see whether the property sits in a mapped earthquake hazard zone. A lot in one of those zones calls for geologic and engineering studies before construction, which can find and reduce the risk of the ground failing and make the house more resilient to shaking. It's worth checking before we meet, since it can shape the slab plan.

Start with the City of Lomita, because the county's Building and Safety office issues permits only after the City approves the project. The City's pre-review list names additions, new homes and garages but doesn't mention slab foundations, so call the City's Community and Economic Development Department at 310-325-7110, extension 122, to ask what your job needs. Expect a plan check, where reviewers go over your plans against safety, building and environmental standards, and during the estimate I'll explain which office handles each step and walk you through any that fall to you.

Yes, the Los Angeles area pours concrete all year, and one local cost guide says the mild climate gives near-ideal curing conditions almost every day. That means you can usually set the pour around your own plans instead of waiting for a season. We do this work in Lomita and the cities around it, so if yours isn't on the site, call and ask.

California has a concrete contractor license that covers forming, pouring, placing and finishing concrete, so that's the license to ask any bidder about. We're fully licensed and insured and have been in business since 2017. I'm the one who comes out, writes your estimate and leads the crew on your slab.