Additions 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 homeowners frequently add second stories to capture views and square footage in established neighborhoods. Cities like Burlingame and San Carlos have strong demand for room additions on mid-century ranches. Permit timelines average 4-8 weeks depending on the city.

Most single-story homes in Alameda County can support a second story addition with proper structural engineering. We evaluate your foundation, framing, and local zoning during our free consultation. Many homes in Oakland have successfully added second stories.

Most home additions in Alameda County take 3-6 months from permit to completion. Second story additions are typically 4-6 months. We handle all Alameda County permits and manage construction so you have one point of contact.

Yes. We handle all permitting for home additions in Alameda County and Alameda County — architectural plans, structural engineering, and city submissions. We work with Alameda County planning departments regularly.

In most cases, yes. We phase construction to minimize disruption. For second story additions, there may be a brief period where certain rooms are inaccessible. We create a detailed plan before starting so you know exactly what to expect.

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.