Second story additions in Berkeley

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.

Second story additions in Berkeley typically run $400 to $575 per square foot. An 800 to 1,200 sq ft addition costs $320,000 to $690,000 fully built. Costs in Berkeley are higher than the broader Bay Area because of AUP application requirements, mandatory seismic upgrades on pre-1978 homes near the Hayward Fault, and WUI material requirements for hillside projects.

Yes. Most second story additions in Berkeley require an Administrative Use Permit (AUP) that goes before the Zoning Adjustments Board. AUPs are reviewable for neighbor appeal, which is why our designs prioritize neighborhood compatibility, height stepping, and respectful massing from the first sketch. Our team prepares the full AUP application package and presents at ZAB hearings as needed.

Plan on 4 to 7 months from application to issued building permit in Berkeley. The Administrative Use Permit takes 60 to 90 days at the Zoning Adjustments Board, Permit Service Center plan check runs 8 to 14 weeks in parallel, and Berkeley Fire Department review adds 2 to 3 weeks for any WUI hillside project. Active construction is typically 18 to 24 weeks once permits issue.

Yes. Any second story addition in the Berkeley Hills WUI zone (most areas above the Hayward Fault) must use Class A roofing, ignition-resistant siding, and ember-resistant attic venting. Berkeley Fire Department reviews every WUI permit for compliance with defensible space and access requirements. Our designs incorporate these standards from day one.

We build second story additions across all of Berkeley, including North Berkeley, Elmwood, Claremont, Berkeley Hills, Westbrae, the Gourmet Ghetto area, Le Conte, and Halcyon. We pay particular attention to historic Maybeck and Morgan homes in the hills and to AUP design review in every district.