Custom Homes Contractor in San Mateo County

We serve Northern California across three regions: the San Francisco Bay Area (six counties from Alameda to Santa Clara), Greater Sacramento (Sacramento out to Roseville, Folsom, and Davis), and the Central Valley (Stockton to Modesto). Our crews are based in Castro Valley. We handle permits and know the building codes for each jurisdiction, which matters because requirements and fees vary significantly between cities.

We offer $0-down financing with approved credit, 12-month same-as-cash plans, and extended terms up to 15 years for larger projects. You only pay for completed, inspected work — we never ask for full payment before the job is done. Your project manager will walk you through every option during your estimate appointment. We also accept checks, ACH, and all major credit cards.

Yes. CSLB License #1078806 — verify it anytime at cslb.ca.gov. We carry $2M general liability, full workers’ comp, and are bonded per California law. We hold GAF Master Elite, Owens Corning Preferred, CertainTeed ShingleMaster, and James Hardie Elite Preferred certifications — each requires annual training and quality audits to maintain. We’re happy to provide proof of insurance before any work begins.

Most exterior projects in Northern California require a building permit. Fees vary by city — Oakland runs $200–$600, Peninsula cities often more. We handle the entire permit process: application, plan submission, and scheduling inspections. Permit fees appear as a separate line item in your estimate so you’ll see every cost upfront. For homes in WUI fire zones (Berkeley Hills, Oakland Hills, parts of Marin), we ensure full compliance with local fire-rated material requirements.

San Mateo County offers diverse building opportunities, from hillside lots in Hillsborough to infill parcels in Redwood City. Building codes vary by city, with Hillsborough having strict architectural review. Coastal development in Pacifica and Half Moon Bay requires BCDC and Coastal Commission compliance.

Most custom homes in Alameda County take 12-18 months from design to completion. The Alameda County permitting process adds 2-4 months. We manage every phase so there are no gaps between design, permits, and construction.

Yes. We handle all custom home permitting in Alameda County and Alameda County — architectural plans, structural engineering, soils reports, Title 24 energy compliance, and city submissions. We navigate Alameda County planning departments daily.

Absolutely. Modern farmhouse is one of our most requested styles in Alameda County. We design and build everything from contemporary modern to craftsman and Mediterranean. Many homeowners in Fremont are choosing modern designs that complement the neighborhood character.

Yes. Many lots in Alameda County and Alameda County are on slopes. We have extensive experience with hillside construction, including retaining walls, custom foundations, and grading. Our engineers evaluate every lot for feasibility.

Many older homes in Alameda and Alameda County were built before modern seismic codes. While a roof replacement alone doesn't trigger a seismic retrofit requirement, it's the ideal time to reinforce roof-to-wall connections — especially for homes near the Hayward Fault. Hamilton Exteriors uses Simpson Strong-Tie hurricane clips on every roof we install, which improves earthquake resistance and meets California's latest building standards at no extra cost.

Yes. Parts of Alameda and the East Bay Hills fall within Cal Fire's Very High Fire Hazard Severity Zones (VHFHSZ). Homes in these zones must use Class A fire-rated roofing materials — which includes the asphalt, metal, and tile options Hamilton Exteriors installs. If your property is in a designated fire zone, we also ensure compliant ember-resistant vents and remove combustible material within 5 feet of the roofline as part of our standard installation process.