Foundation block wall installation in Oxnard CA - a wall that stands on firm ground

It should sit on undisturbed native soil, ground nobody has dug up or filled. Where that soil is weak or soft, it should come out and be replaced with compacted soil, gravel or concrete, so on a soft lot that extra digging and fill becomes part of the job.

Use dampproofing where water won't push against the wall and waterproofing where it might, which is what codes typically require. A high water table or heavy clay backfill can build that push, while dampproofing suits a lot where groundwater drains through gravelly backfill into a drain line below ground. I look at the soil and the drainage and tell you which one your wall needs on the quote.

The city's quick permit list doesn't settle it, so the answer comes from Oxnard's Building and Engineering office. That office issues over-the-counter permits for simpler projects, and its list names wall or fence installations, not foundation block walls. We check with the office for your address before work starts, and if a permit is needed, we handle the paperwork and the inspections. If you'd rather ask yourself, the city's permit office takes questions by phone and at the city's own email, buildingpermits@oxnard.org. The city also publishes a Concrete Block Wall Detail handout, B801, with its building handouts, and it's a fair question to ask me how that detail fits your wall.

A home improvement contractor in California needs a license from the Contractors State License Board, or CSLB, whether they work full-time or part-time. Ask whoever bids your foundation wall for their license before you sign anything.

It comes down to the wall's length and height, what we find under the ground, and the water protection and backfill your site needs. Soft soil that has to come out, waterproofing instead of dampproofing, and a beachfront lot with extra requirements all push the price up, while a firm, well-drained site keeps it down. Your written quote lists what's included, so you can see where the money goes.

If your lot sits between the ocean and the first public street inland from the beach, the city requires buildings and structures there to rest on pilings, with minor structures like planter boxes, sidewalks and patio covers excepted. Those lots also need a soils report from a registered civil engineer, and the owner writes to the building official and the city planner stating the lot faces wave run-up and sheet flow. State-mapped liquefaction zones, where shaking can make soil act like liquid, mark where foundation soils have to be investigated, though single family frame houses up to two stories outside a development of four or more units are exempt from the state rules, and local agencies can be stricter.