Additions Contractor in South San Francisco

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.

Home additions in South San Francisco typically cost $200-$500 per square foot depending on scope and finishes. A second story addition usually runs $250,000-$500,000. With median home prices at $1,100,000 in South San Francisco, adding space is often more economical than moving. Free consultations available.

Most single-story homes in South San Francisco 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 Old Town have successfully added second stories.

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

Yes. We handle all permitting for home additions in South San Francisco and San Mateo County — architectural plans, structural engineering, and city submissions. We work with South San Francisco 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.

Yes, all home additions in South San Francisco require building permits from San Mateo County. We handle permit applications, structural engineering, plan check responses, and all inspections. Our CSLB #1078806 license covers the full scope of work.

This depends on your lot size, foundation, and zoning in South San Francisco. Ground-floor additions use yard space but avoid structural upgrades. Second stories preserve yard but require foundation evaluation. We assess both options during consultation.

Many South San Francisco homes built in the 1950s-1970s suburban homes and mid-century ranches on hilly terrain era may need foundation reinforcement for a second story. Our structural engineer evaluates your existing foundation and designs any necessary upgrades. This assessment is part of our design process.

Home additions in South San Francisco typically return 50-70% of their cost at resale. In the Peninsula market at $1,200,000 median values, added square footage directly increases your home's competitive position and livable space.

Yes, our architect-led design-build team creates addition plans that integrate with your existing South San Francisco home's architecture. We handle design, engineering, permits, and construction under one contract for a seamless experience.