Foundation installation in El Monte CA - built on what your soils report says

Most people who call about a foundation are planning a room addition, a backyard ADU or a new building on a lot, and the first surprise is that the concrete isn't step one. The price mostly turns on what the soils report and the engineer's plans call for, then on the size of the footprint and how hard it is to get concrete to the spot. The schedule turns on the report, the plans and the city's review more than on the pour. If the city wants a report or plans first, we tell you at the start and help you get them, and our written estimate says what's in the price and what isn't. If you mainly need a slab floor, our slab foundation building page covers that work.

A new foundation here usually starts with a soils report, so I get the order of steps clear with you before anyone talks about pouring, and whatever the report calls for goes into the design and into our price. Once the plans are approved, we dig out to the depth they show and pack the subgrade, the soil the concrete sits on, because ground that's only raked level settles later and takes the foundation with it. We set the forms and tie in the rebar, the steel that holds the concrete together if it cracks or the ground shifts, and we check where water will run so it drains away from the house. On hot days we pour early, since concrete placed in midday heat can end up with a weak, dusty top. We work the concrete so it settles solid with no gaps, finish it and let it cure, which means keeping it damp and covered so it gains strength slowly instead of drying out weak. On slab floors we cut control joints, shallow grooves that give cracks a straight line to follow, on time so they land where we chose. If a budget gets tight, I'd rather cut back on the finish than on the base, because you can redo a surface later but you can't get back under a house once it's built.

Some jobs don't need a full foundation. A carport, a block wall or a heavy post may only need concrete footings, and we treat the ground under them with the same care. For small property owners building on a lot they rent out or work from, we also handle concrete parking lot building, and planning it with the foundation keeps the paving and the building draining the same way.

El Monte requires a soils report before it issues a permit for any new foundation or footing, on any structure and at any size, and that includes room additions and ADUs. The city says the state has mapped the majority of El Monte in earthquake hazard zones for liquefaction, where loose, wet ground can lose its strength in a strong shake, so most lots end up needing a new study of their own. That's the city's view across the whole map, and only the report for your lot tells you what's under your house. Permits go through El Monte Building and Safety, and when your job needs one, we pull it and line up the inspections.

A lot of the foundation calls we get here are for additions and ADUs behind older single-story houses, where the only way in is a narrow side yard, so we work out how the concrete gets to the back before we price it. We do the same work in Rosemead and Monterey Park, and out to West Covina and Pomona.