Second story additions in San Francisco

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 San Francisco typically run $425 to $650 per square foot, putting an 800-1,200 sq ft addition at roughly $340,000 to $750,000 fully built. Costs are higher than the broader Bay Area because of DBI and Planning permit fees, mandatory seismic upgrades on pre-1978 homes, and the prevailing labor rates in the city. Every Hamilton Exteriors estimate is fully itemized so you see exactly what each phase costs.

Yes. Almost every second story addition in San Francisco triggers a Section 311 neighborhood notice, which gives neighbors within 150 feet 30 days to request a Discretionary Review hearing at the Planning Commission. Our team prepares the notice package and walks you through what to expect. We have shepherded projects through DR hearings and design well within RH-1 and RH-2 zoning to minimize the chance of a contested hearing.

Plan on 6 to 12 months from application to issued building permit for a second story addition in San Francisco. Planning review takes 3 to 5 months, the 311 neighborhood notice adds 30 days, and DBI plan check runs 2 to 4 months in parallel. Active construction is typically 18 to 24 weeks once permits issue. We start the permit process immediately after design approval so we can stack timelines.

For most second story additions in San Francisco, you can stay in the home for the first 8 to 12 weeks while we build the addition above the existing roof under temporary weather protection. The 4 to 6 week window where we cut into the existing ceiling and tie in stairs typically requires temporary relocation. We coordinate move-out timing in your project schedule and build it into the contract.

We build second story additions across all of San Francisco, including the Sunset, Richmond, Noe Valley, Bernal Heights, Glen Park, the Mission, Potrero Hill, Pacific Heights, and the Marina. We pay particular attention to historic districts like Alamo Square and Liberty Hill where Historic Preservation Commission review applies, and we have completed projects in every major SF zoning district.