Luxury ADUs Built for Your Property. And Your Lifestyle.
Design-build ADU construction in Marin County. AI-accelerated permitting across all 11 Marin jurisdictions. One team from site visit to move-in. Book your complimentary site assessment.
4.9★
Google Rating
47
Five-Star Reviews
150+
Projects
$85M+
Constructed
CSLB #1106798
Licensed
“
ConstruBay handled our entire ADU from permit submission to move-in day. They identified a setback issue on our lot before we ever signed — and redesigned around it without drama. The unit rented for $3,800 the first week it was listed.
— Greg & Susan A. · Mill Valley · Detached ADU
Our ADU Work
Book Your Complimentary Site Assessment
Serving Mill Valley, San Rafael, Tiburon, Novato & all of Marin County
Step 1 of 4
What type of ADU are you building?
We respond within 2 hours · No pressure · No spam · CSLB #1106798
AI-Powered Permit Planning
No other contractor in Marin County offers this.
ConstruBay uses PlanPass.ai — an AI-powered construction permit intelligence platform — to accelerate Marin County permit approvals, flag issues before submission, and give clients real-time visibility into their permit status across all 11 Marin County jurisdictions.
40% Faster
permit approvals vs. Marin County average
Pre-Submission
issue detection before rejection
Real-Time
permit status visibility for clients
Marin-Specific
code intelligence across all jurisdictions
Common Questions
ConstruBay takes on a limited number of ADU projects per quarter — ensuring every client receives uncompromising personal attention from Paulo.
© 2026 ConstruBay · CSLB #1106798 · Licensed · Bonded · Insured