We build architect-designed residences from foundation to finish, managing structural engineering, MEP systems, and interior millwork as a single point of accountability. Every decision — from the foundation type to the hardware finish — is coordinated under one roof, eliminating the costly friction between trades that plagues most luxury builds.
Each Marin estate we construct is a permanent expression of your vision. We work closely with your architect and interior designer, or we can refer you to our trusted design partners, to deliver a finished home that exceeds architectural drawings in craftsmanship and detail.
ConstruBay (CSLB #1106798) is based in Mill Valley and has executed custom home construction projects across Marin, Sonoma, and Napa Counties.
What Is Included
The Marin Advantage
Building in Marin County requires navigating among the most complex permitting environments in California. Our proprietary PlanPass.ai permit intelligence platform accelerates approvals across Marin County, the Town of Tiburon, City of Sausalito, and Marin County Fire — typically reducing permit timelines by 30–45%. Our team has extensive Wildland-Urban Interface (WUI) construction experience, meeting Marin County's strict fire-hardening requirements without sacrificing the architectural vision. We have completed projects subject to Design Review Board approval in Mill Valley, Tiburon, and Belvedere, and we know exactly how to present materials, massing, and landscape plans for approval on the first submission.
Our Process
Curation & Design
We begin with an in-depth discovery session at your property, translating your vision into a fixed-scope brief with transparent pricing.
Artful Execution
Our licensed craftsmen execute with precision under direct site supervision — every material sourced, every detail approved by you before installation.
The Final Reveal
A thorough walkthrough with your project lead ensures every element meets our standard before you take possession of your transformed space.
Investment Range
$800,000 – $3,000,000+
Typical Project Range
All projects are delivered under a fixed-scope contract — the number you approve is the number you pay.
Frequently Asked Questions
Related Services
Begin Your Project
Begin Your Custom Home Construction Project
Fixed-scope contract. No surprises. Schedule a private consultation with Paulo.