Additions & ADUs in San Francisco.
Room additions, second-story pops, ADU and JADU builds. We handle the survey, design coordination, permits, and construction.
Why GB Contractors for additions & adus in San Francisco.
GB Contractors (legally Golden Bay Contractor LLC, founded by Manuel Escobar in 2004) is a family-owned, CSLB-licensed general contractor based in Novato. We've been doing additions & adus projects across San Francisco County for two decades. 45 minutes from Novato in good traffic; we typically dedicate full days to SF site visits.
→ We travel across the bridge for the right SF project — generally higher-end residential.
→ Coordinating with SF DBI inspectors and historic-preservation review is part of the scope.
→ Edwardian and Victorian preservation work alongside modern interior renovation.
What's in scope.
Typical line items on a additions & adus we'd run in San Francisco. Every bid is line-item — no surprises.
- → Ground-floor additions and bump-outs
- → Second-story additions
- → Detached and attached ADUs
- → Junior ADU (JADU) conversions
- → Foundation work and structural integration
- → MEP rough-in and code compliance
- → Title 24 and energy compliance
- → Permits, including state ADU statute
Working in San Francisco.
SF DBI runs a more involved permit and inspection process than Marin. Soft-story retrofit, sprinkler requirements, and historic-district review apply to many projects. We pre-budget extra weeks for SF permitting.
We've worked across San Francisco's neighborhoods — Pacific Heights, Presidio Heights, Cow Hollow, Marina, Russian Hill, Noe Valley, Sea Cliff, Forest Hill. Local knowledge of the building department, the design-review patterns, and the building stock isn't a marketing claim for us; it's two decades of repeat work.
Common questions about additions & adus in San Francisco.
Does GB Contractors do additions & adus in San Francisco?
Yes. Additions & ADUs is one of our core services and San Francisco is squarely in our active service area. 45 minutes from Novato in good traffic; we typically dedicate full days to SF site visits.
What does a additions & adus cost in San Francisco?
Mid-range projects in our portfolio start around $150K. High-end builds with structural changes, premium materials, or custom cabinetry typically run $800K+. San Francisco permitting and design-review can add to both timeline and cost — we factor that into bids up front.
How long does a additions & adus take in San Francisco?
5 months to 12 months once construction starts, depending on scope and design-review timing. SF DBI runs a more involved permit and inspection process than Marin. Soft-story retrofit, sprinkler requirements, and historic-district review apply to many projects. We pre-budget extra weeks for SF permitting.
Are you licensed to work in San Francisco?
Yes. GB Contractors (Golden Bay Contractor LLC) holds CSLB License #992507 (Class B General Building), valid statewide in California, and we're fully insured. We pull all required permits and handle inspections directly with the San Francisco building department.
Other services in San Francisco
Talk to us about your San Francisco project.
First call is free. No pressure. Real numbers.
Get a Bid →