Second story additions in Concord

We serve six Bay Area counties — Alameda, Contra Costa, Marin, Napa, San Mateo, and Santa Clara — covering 47 cities from Oakland to San Jose. Our crews are based in Castro Valley, putting us within 45 minutes of every city we serve. 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 the Bay Area 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.

Second story additions in Concord typically run $250 to $400 per square foot, so an 800 to 1,500 sq ft addition costs $200,000 to $480,000 fully built. Concord is among the most affordable Bay Area cities for second story work because of flat lot conditions, fast permit turnaround, and lower city fees. Every Hamilton Exteriors estimate is itemized so you see exactly where each dollar goes.

Most second story addition permits in Concord clear plan check in 8 to 12 weeks, faster than most Bay Area cities. The Concord Building Division uses the Accela online portal for submittals, and plan reviewers are responsive to revisions. Active construction is typically 14 to 20 weeks once permits issue.

Most pre-1980 Concord homes need foundation bolting and cripple wall bracing before a second story is added. The flat lots common in Concord make this work straightforward, with no hillside excavation needed. Our structural engineer performs a foundation assessment during feasibility and prices any required upgrades into the upfront estimate.

For most Concord second story additions, you can stay in the home for the first 10 to 14 weeks of construction while we frame the addition above the existing roof under temporary weather protection. A 3 to 5 week window when we cut into the existing ceiling for stairs and HVAC tie-ins usually requires temporary relocation.

We build second story additions across all of Concord, including Crystyl Ranch, Dana Estates, Holbrook Heights, Sun Terrace, Ygnacio Valley, Clayton Valley, and the Todos Santos downtown area. We have completed projects in every Concord zoning district.