Your home’s foundation is its most critical structural element. Whether you are building a new home, adding an ADU, repairing cracks, or retrofitting an older LA property for seismic safety, APLA Construction delivers licensed, engineered foundation work across Greater Los Angeles. We are a California licensed general contractor (CA Lic #1136359) with experience in all foundation types common to Los Angeles residential and small commercial construction.
Foundation costs in LA vary significantly based on soil conditions, access, scope, and structural engineering requirements.
Los Angeles soil conditions — expansive clay, fill soil, and liquefaction zones — often require geotechnical reports before foundation work. APLA coordinates with structural engineers and soils engineers to ensure every foundation meets Los Angeles Building Code requirements.
Homes built before 1980 throughout Los Angeles — in neighborhoods like Silver Lake, Echo Park, Highland Park, Koreatown, West Adams, and the San Fernando Valley — often have unbraced cripple walls (short wood-framed walls between the foundation and first floor). These are the most common cause of structural failure in moderate earthquakes. The Los Angeles Department of Building and Safety (LADBS) has a mandatory soft-story retrofit program, and APLA completes cripple wall retrofits to FEMA P-1100 standards.
Much of the Los Angeles basin sits on expansive clay soils that swell when wet and shrink when dry. This seasonal movement is a leading cause of foundation cracking in LA homes, particularly in the Valley and hillside areas. APLA diagnoses the root cause before recommending repair — addressing drainage and soil movement, not just patching cracks.
Los Angeles has tens of thousands of hillside homes in areas like Laurel Canyon, Bel Air, Silverlake, Eagle Rock, and the Santa Monica Mountains. These properties often require caisson or pier foundations that extend deep below unstable surface soils to bedrock. APLA works with licensed geotechnical engineers on all hillside foundation projects.
Foundation settlement — where one part of the foundation sinks more than another — causes sloping floors, sticking doors and windows, and diagonal wall cracks. APLA uses underpinning and helical pier systems to stabilize and re-level settled foundations across Los Angeles.
Every ADU and room addition starts with a foundation. APLA handles the full scope:
We coordinate all foundation work with LADBS inspections and close out permits before the next phase of construction begins. See our full ADU construction services.
Common warning signs include diagonal cracks at window and door corners, floors that slope or feel bouncy, doors and windows that stick or no longer close properly, visible cracks in the foundation itself, and gaps between walls and the ceiling or floor. Any of these warrant a professional evaluation. APLA offers free foundation assessments throughout Greater Los Angeles.
Yes. Any structural foundation work — new construction, repair involving reinforcement, underpinning, or replacement — requires a permit from LADBS or your city’s building department. APLA handles all permit filings and manages inspections from start to finish.
A cripple wall retrofit typically takes 1–3 days. Minor crack repair takes 1–5 days. A partial underpinning job runs 1–3 weeks. A full foundation replacement for an average LA home takes 3–6 weeks including excavation, forming, pouring, and curing time.
If your home was built before 1980 and has a raised foundation with cripple walls, it is likely vulnerable to earthquake damage and may be subject to LADBS’s mandatory retrofit ordinance. APLA can evaluate your home’s seismic vulnerability and complete the retrofit to current code.
A new slab or stem wall foundation for a garage conversion or detached ADU in Los Angeles typically costs $15,000 to $45,000 depending on size, soil conditions, and whether any grading or drainage work is required.
Yes. As a licensed general contractor, APLA self-performs foundation work as part of a complete project — whether that is an ADU, home addition, new construction, or full remodel. You get one contractor, one contract, and one point of accountability.
APLA Construction handles foundation repair, seismic retrofits, new foundation construction, and foundation replacement throughout Greater Los Angeles. All work is fully permitted, engineered, and inspected.
Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359
Request your free on-site foundation evaluation — no obligation, honest assessment from an experienced LA contractor. See our foundation service page.