Slab foundation building in Pleasant Hill CA - planned for soil that moves

An installed reinforced concrete slab in the Bay Area usually costs about $9 to $18 per square foot, according to a regional cost guide. That's the going market range, not our price, and where a slab lands in it depends on its size, the slab type in your plans and how easy your lot is to reach. Your estimate gives you the figure for your own slab.

Some movement and a few cosmetic cracks are normal for a slab on expansive soil, the kind that swells when wet and shrinks when dry. Engineers who study slab performance say a slab that stays fully still on that ground would cost too much and likely couldn't be built at all. Cracks can't be stopped entirely, but well-planned joints keep them small and in places somebody chose, so ask any contractor where the joints will go on your slab.

It can be, and it's worth asking your engineer whether it suits your lot. The trade group for the method calls post-tensioned slabs, which have steel cables pulled tight after the pour, a cost-efficient, high-performance foundation for houses on shrink-swell soil. One soil data site rates the most common soils in Contra Costa County high for shrink-swell, so it's a fair question to raise while your plans are being drawn.

A slab should be walkable within 48 hours, though concrete takes about a month to fully cure. The same Bay Area guide suggests waiting a week before putting heavier loads on it, so it makes sense to schedule the heavier work after that first week. Curing is the slow hardening as the concrete holds onto its water, and rushing it is how you get a weak slab.

You apply with the City of Pleasant Hill Permitting Office, uploading the application and any required plans through the PHill Online Service Center. Before you start, the city's online permit guide builds a list of the steps for your project from its location and details. The city also said it would move to the newer state building code on January 1, 2026, so if your plans were drawn earlier, ask your designer which code they follow.

Yes, for a job this size. California's exemption for minor work only covers jobs up to $1,000, and only when the work needs no permit and the worker employs no one, so ask each bidder which state license they hold. The state licensing board defines a concrete contractor as one who forms, pours, places, finishes and installs concrete work, and we're licensed and fully insured.