Northern California's Architect-Led Custom Home & Exteriors Contractor

We serve Northern California across three regions: the San Francisco Bay Area, Greater Sacramento, and the Central Valley. Our published guides cover 14 counties and 88 cities. Our Castro Valley and Sacramento offices support local estimating, permit coordination, and project planning across these regions.

Financing may be available for eligible projects with approved credit. Available terms depend on lender approval, project scope, and current programs. Your project manager can review the options that apply before work begins. We also accept checks, ACH, and major credit cards.

Yes. Hamilton Exteriors holds CSLB License #1078806, active general liability coverage, and the required contractor bond. We also hold GAF Master Elite and James Hardie Elite Preferred credentials. We can provide current proof of coverage before work begins.

Permit requirements depend on the project scope and local jurisdiction. Hamilton Exteriors coordinates required applications, plan documents, corrections, and inspections. Permit fees and allowances appear in the proposal before construction begins.

A full roof replacement in Northern California typically costs between $15,000 and $100,000, depending on roof size, pitch, and material. Asphalt shingle roofs — installed on 75% of U.S. homes according to the Asphalt Roofing Manufacturers Association — start around $1,075 per roofing square. Metal roofing starts at $1,525 per square and reflects up to 70% of solar radiant heat (Oak Ridge National Laboratory, DOI:10.2172/1220146). Tile and slate cost more but can last 50–100 years. Permit fees across Northern California counties range from $200 to $800, with Alameda and Santa Clara counties typically at the higher end. Hamilton Exteriors provides detailed square-footage pricing in every estimate so you can compare materials side by side before committing.

Most residential roof replacements take 2–5 days of on-site work once materials arrive. Siding projects run 1–3 weeks depending on square footage. Window replacements average 1–2 days for a full home. Larger projects like ADUs and additions take 4–8 months from permit to move-in. Every Hamilton Exteriors estimate includes a written timeline with milestones so you know exactly what to expect. Your project manager sends daily photo updates through CompanyCam so you can track progress from anywhere.

A design-build contractor handles both the architectural design and construction under one contract, one team, and one point of accountability. This eliminates the coordination gaps that happen when you hire a separate architect and builder. Hamilton Exteriors is led by a licensed architect (Alexander Hamilton Li) who also holds a General Contractor license (CSLB #1078806), which means your project is designed and built by the same person — reducing change orders, shortening timelines, and keeping the original design intent intact from blueprint through final inspection.

Eligible GAF roofing and James Hardie siding systems can include transferable manufacturer warranty coverage. Window warranties vary by the selected product line. Before work begins, your written proposal identifies the exact manufacturer coverage and Hamilton Exteriors workmanship terms for your project.