Engineered, code-compliant foundations for new homes, ADUs, additions and buildings in Atherton — poured to your soil report and your build schedule, not a generic template.
Atherton building departments review foundation plans against the site conditions your specific parcel actually has — hillside terrain where grading, drainage and sometimes a geotechnical (soils) report drive the foundation design as much as the building plans do. Most of the projects we take on in Atherton sit on larger hillside and estate lots, often with existing homes undergoing custom additions or new construction, and a foundation designed without accounting for that tends to draw corrections or, worse, perform poorly once it's in the ground. We start every Atherton project by confirming your soil report, your structural engineer's plans and your site's actual conditions, then build to that — not a template adjusted after the fact.
Full foundation construction for ground-up custom homes in Atherton — excavation, forming, rebar and pour, built to your engineer's stamped plans.
Slab-on-grade and raised foundations sized and engineered for detached, attached and garage-conversion ADUs on Atherton lots.
New footings and foundation extensions for room and second-story additions in Atherton, tied into your existing foundation correctly.
Both foundation types, built to spec for Atherton's soil and drainage conditions — a straightforward slab where it fits, a raised foundation where it's needed.
We review your approved plans, structural engineering and soil report against your specific Atherton parcel before anything is dug.
Excavation, forming and rebar placement built to the engineered spec — footings, stem walls or slab, sized and reinforced correctly.
Concrete poured, finished and cured on schedule, with documentation your inspector and general contractor both need.
We coordinate the foundation inspection and hand off a foundation that's ready for your framer.
Two decades pouring foundations across the Bay Area, not a generic national template.
Full California contractor's license and insurance coverage — ask to see it.
We build around your lot's actual slope and geotechnical report — grading, drainage and retaining requirements included — instead of treating a hillside parcel like a flat one.
We plan pours around your framer's start date, not the other way around.
Based in the Bay Area, working throughout Santa Clara, San Mateo, Alameda and Contra Costa counties.
In almost all cases, yes — foundation design for new construction, additions and ADUs typically requires a licensed structural engineer's stamped plans before a building department will permit it. We build to those stamped plans; if you don't have an engineer yet, we can point you to ones we work with regularly.
It depends on project size and foundation type — a straightforward ADU slab in Atherton moves much faster than a full custom home foundation with extensive grading. We'll give you a realistic timeline once we've reviewed your specific plans and site.
Most single-family lots qualify for at least one ADU under state law, subject to local setback, height and lot-coverage rules that vary by city and zoning district. We confirm what your parcel supports as part of the foundation design process, working alongside your ADU plans.
Both. Some clients come to us directly, often before they've hired a general contractor; others are referred by a GC or architect who wants a foundation sub they can hand a stamped plan set to and trust.
Usually, yes. Sloped Atherton lots often require a geotechnical (soils) report, additional grading and drainage work, and sometimes a different foundation type than a flat lot would need — a stepped or raised foundation instead of a simple slab, for example. We work from your soils report and civil plans so the foundation is engineered for your specific slope, not adjusted after the fact.
New construction is our primary focus, but we do take on foundation repair and seismic retrofit work for existing homes as a secondary service — see our Foundation Repair & Retrofit page for details.
Tell us what you're building — a new home, an ADU, an addition — and we'll get back to you with next steps, usually within one business day.
(925) 592-7162
ProHomeFoundation
