Service Area
General Contractor in Antioch, CA
Otto & Sons Construction is based in Antioch. When you call, you reach Alani. Work starts on time, gets done right, and is built to handle what East Contra Costa throws at it.
Antioch is our home base. Alani lives and works in this community, which means when a job comes up in Oakley, Brentwood, Pittsburg, or anywhere along the Highway 4 corridor, we are not driving in from across the Bay. We know the older ranch homes in central and north Antioch, the 1970s and 1980s tract neighborhoods near downtown, and the newer subdivisions out toward Lone Tree Valley and Discovery Bay. We have pulled permits at Antioch's Building Division at 200 H Street more times than we can count, and we know what the plan checkers are looking for.
What We Build in Antioch, CA
Kitchen and Bath Remodels
Most of the homes in central and north Antioch were built between 1960 and 1990. The layouts and finishes show it. We gut kitchens and bathrooms back to the studs, handle any framing, plumbing, and electrical rough-in required, and finish them to current code. We pull the permit, manage the inspections, and you deal with Otto directly throughout.
Room Additions and ADUs
Lot sizes along the Highway 4 corridor are generous compared to the inner Bay. That creates real opportunity for room additions and accessory dwelling units. We assess your existing foundation and slab for the expansive clay conditions common in this area before we design anything, so the addition does not crack away from the main structure in year three.
Concrete Work
Driveways, patios, flatwork, and retaining walls on expansive clay need proper subgrade prep and control joint placement. We do the excavation, compaction, and forming ourselves. We do not skip steps because the soil here does not forgive them.
Commercial Tenant Improvements
Antioch's commercial corridors along Hillcrest Avenue and East 18th Street have a steady turnover of retail, office, and service tenants. We handle interior TI work including framing, ceilings, ADA-compliant restrooms, and finish carpentry. We coordinate with the City's Building Division on commercial plan review and keep your buildout on schedule.
Service Calls and Small Jobs
Dry rot repair, structural fence replacement, concrete patching, a single bathroom update. We take service calls in Antioch and the surrounding East County cities. Most contractors will not touch a job under a certain dollar threshold. We will, because a lot of our repeat customers started with a small job.
Building in Antioch, CA
East Contra Costa County has some of the most challenging soil conditions in the Bay Area for construction. The expansive clay soils common throughout this region swell when they absorb winter rain and shrink back in dry summers, putting cyclical stress on slabs, foundations, and flatwork. Concrete driveways, patios, and additions that skip proper subgrade prep crack within a few years. For room additions or ADUs, we assess the existing foundation before we frame anything. On the seismic side, the California Geological Survey released official seismic hazard zone maps for Antioch in 2019, identifying areas with liquefaction potential, particularly in lower-lying areas closer to the San Joaquin River. That means the 2025 California Building Code seismic provisions are not a checkbox here, they are load-bearing for any new structure. Permit authority within Antioch city limits runs through the City of Antioch Community Development Department, Building Division, located at 200 H Street, Antioch, CA 94509. Properties in unincorporated Contra Costa County nearby, including communities like Discovery Bay, go through the County's own Building Inspection Division and permit portal. Antioch began enforcing the 2025 California Building Codes effective January 1, 2026. The housing stock in this area is heavily concentrated in the 1940 to 1999 range. Homes built before 1978 may have lead paint and asbestos-containing materials that require proper handling during remodels. We build that into the scope upfront.
Cities We Serve
Antioch, CA Construction FAQ
Do I need a permit for a kitchen remodel in Antioch?
Most kitchen remodels that involve moving or adding electrical circuits, relocating plumbing, or touching the gas line require a permit from the City of Antioch Building Division at 200 H Street. A cosmetic update, replacing cabinet fronts or countertops without touching the rough systems, typically does not. We review the scope with you before we start and pull every permit the work requires. Antioch enforces the 2025 California Building Codes as of January 1, 2026.
How long does permit review take in Antioch for a room addition?
Standard residential permits including room additions typically take three to six weeks for initial plan review at Antioch's Building Division, based on current department timelines. Simple projects can qualify for over-the-counter approval in one to three business days. We prepare complete plan sets to avoid back-and-forth that adds weeks to the process.
Our house is in unincorporated Contra Costa County, not inside Antioch city limits. Who issues our permits?
Properties in unincorporated areas of Contra Costa County go through the County's own Building Inspection Division, not the City of Antioch. The County serves several unincorporated communities near Antioch, including Discovery Bay, which is not an incorporated city. We work under both jurisdictions regularly and know what each one requires.
Our slab has cracks. Is that a soil problem or a construction problem?
In East Contra Costa County it is usually both. The expansive clay soils here cycle through swelling and shrinking with the seasons, which puts stress on any concrete that was not placed over properly compacted and prepared subgrade. Before we quote repairs or an addition off an existing slab, we assess whether the movement is ongoing or settled. An ongoing movement problem needs to be addressed at the foundation level, not patched at the surface.
Do you handle jobs in Brentwood, Oakley, and Pittsburg, or only Antioch?
We serve the full Highway 4 corridor including Brentwood, Oakley, Pittsburg, Bay Point, Discovery Bay, and Concord. Antioch is our home base so our response time across East Contra Costa is fast. We are not a contractor that drives out from San Jose or Oakland and charges you travel time.
Are you licensed and insured for work in California?
Yes. Otto & Sons Construction holds CSLB General Building Contractor License #1104751, active in California. We carry $1 million in general liability insurance and full workers' compensation. You can verify the license directly at the CSLB website using our license number.
Serving Antioch, CA
Based in Antioch. Call (925) 435-4516 or email alani@ottoandsonsco.com to talk through your project.