Additions & ADUs in Sonoma County.
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 Sonoma County.
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 Sonoma County for two decades. 30 minutes to Petaluma, 50 minutes to Santa Rosa — Sonoma County is in our daily reach.
→ Wine country and rural residential projects are a growing part of our work.
→ Familiar with Sonoma County's fire-rebuild rules and updated wildland-urban-interface code.
→ Coordinate with structural engineers familiar with valley soils and seismic profile.
What's in scope.
Typical line items on a additions & adus we'd run in Sonoma County. 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 Sonoma County.
Sonoma County Permit Sonoma covers unincorporated areas; each incorporated city has its own building department. Fire-rebuild and ag-residential remodels often have specialized review tracks.
We've worked across Sonoma County's communities — Santa Rosa, Petaluma, Sebastopol, Healdsburg, Glen Ellen, Sonoma, Bodega Bay. 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 Sonoma County.
Does GB Contractors do additions & adus in Sonoma County?
Yes. Additions & ADUs is one of our core services and Sonoma County is squarely in our active service area. 30 minutes to Petaluma, 50 minutes to Santa Rosa — Sonoma County is in our daily reach.
What does a additions & adus cost in Sonoma County?
Mid-range projects in our portfolio start around $150K. High-end builds with structural changes, premium materials, or custom cabinetry typically run $800K+. Sonoma County 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 Sonoma County?
5 months to 12 months once construction starts, depending on scope and design-review timing. Sonoma County Permit Sonoma covers unincorporated areas; each incorporated city has its own building department. Fire-rebuild and ag-residential remodels often have specialized review tracks.
Are you licensed to work in Sonoma County?
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 Sonoma County building department.
Other services in Sonoma County
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