Licensed General Contractor in Mill Valley, CA

Mill Valley is one of the most desirable — and most challenging — places to build in Marin County. Nestled in the shadow of Mt. Tamalpais, the town combines redwood-shaded canyon homes, hillside properties with sweeping bay views, and flat-lot neighborhoods near the Richardson Bay waterfront. From the winding roads of Blithedale Canyon to the family-friendly streets of Strawberry Point, every Mill Valley project requires a contractor who understands the unique demands of this community.

ConstruBay (CSLB #1106798) is headquartered in Mill Valley and has built extensively across every neighborhood — Tam Valley, Almonte, Alto, Homestead Valley, and beyond. We know the terrain, the soil conditions, and the regulatory landscape that shapes construction here. Mill Valley has some of the most stringent permit requirements in all of Marin County, including a Design Review Board that evaluates exterior changes for architectural compatibility with the surrounding neighborhood.

Hillside construction is our specialty. Many Mill Valley lots sit on steep grades that require geotechnical investigation, engineered retaining walls, and careful grading plans. The town falls within a Wildland-Urban Interface (WUI) fire zone, which means projects must comply with strict fire codes including defensible space requirements, fire-resistant roofing and siding materials, and emergency vehicle access provisions. These requirements add complexity to every project, but they also protect the community — and our team has the experience to navigate them efficiently.

All residential construction permits in Mill Valley are processed through the Mill Valley Planning Department and Building Division, located at 26 Corte Madera Avenue. We handle the entire permit process on behalf of our clients, using our PlanPass.ai technology to pre-analyze plans against Title 24 energy codes, local zoning ordinances, and WUI fire requirements before submission. This catches issues early and reduces the back-and-forth that can delay projects by weeks or months.

Whether you are planning an ADU on a hillside lot in Homestead Valley, a full kitchen renovation in a Blithedale Canyon home, or a whole house remodel in Tam Valley, ConstruBay brings licensed expertise (CSLB #1106798), local knowledge, and AI-powered permit planning to every project. We are your neighbors, and we build to the standard this community demands.