ConstruBay
Luxury home construction Marin County

CSLB #1106798 · Licensed · Bonded · Insured

Licensed General Contractor
in Marin County, CA

Luxury remodels, ADUs, home additions, and custom construction across all of Marin County. Owner-led. Fixed-price contracts. AI-powered permit planning via PlanPass.ai.

Request a Bid(415) 968-9494

150+

Projects Completed

$85M+

Constructed

4.9★

Google Rating

10 Yr

Workmanship Warranty

Why ConstruBay

Marin County's Premier General Contractor

Owner-Led Every Project

Paulo Fernandes personally manages every ConstruBay project. You always know who is responsible. No subcontracted project management, no handoffs to a crew you never met.

Fixed-Price Contracts

We provide detailed line-item estimates with no hidden allowances. Your price is locked before demolition begins. Budget surprises are a contractor problem, not yours.

AI-Powered Permitting

PlanPass.ai pre-screens plans against Marin County code before submission, catching issues that cause correction cycles. Faster approvals, fewer delays, lower total project cost.

10-Year Workmanship Warranty

Every ConstruBay project carries a 10-year workmanship warranty. We build to a standard we are prepared to stand behind for a decade.

Marin-Specific Expertise

We understand hillside construction, WUI fire codes, Design Review Boards, and the permit timelines of all 11 Marin jurisdictions. This knowledge saves months on complex projects.

CSLB Licensed & Verified

CSLB #1106798. Fully licensed, bonded, and insured. Verify our active status at cslb.ca.gov. We carry general liability and workers' compensation on every project.

What We Build

General Contractor Services in Marin County

Luxury Kitchen Remodels

Custom cabinetry, imported stone, professional appliances. $95K–$195K.

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Luxury Bathroom Remodels

Spa-grade primary suites, heated floors, custom steam showers.

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Whole Home Remodels

Full-scope estate renovations. $400–$700/sqft.

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Home Additions

Second stories, primary suite wings, seamless structural integration.

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ADU Construction

Detached ADUs, garage conversions, JADUs. AI permit planning.

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New Custom Construction

Architect-designed estates from foundation to finish.

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Deck & Outdoor Living

Ipe decking, outdoor kitchens, louvered pergolas.

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Basement Finishing

Wine cellars, home theaters, wellness retreats.

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4.9★ Google Rating · 47 Reviews

What Marin Homeowners Say

Quick to respond! They scheduled a complimentary assessment in a timely manner. Hired them for several projects on our home. They do great work, clean, friendly, fun to work with on a daily basis.

Brian M. · Mill Valley

Great place to work at with great people. Energetic with a great foundation for growth. Organized and focused to perform at a high level of expectation for their customers.

Kathryn R. · Marin County

The job was very fast paced and fun. I dealt with different aspects of their business and the team was incredibly professional throughout.

Gwen M. · Marin County

Service Area

General Contractor Services Across All of Marin County

ConstruBay serves every community in Marin County. We understand the unique building requirements, Design Review Board processes, WUI fire codes, and permitting timelines for each of Marin's eleven jurisdictions — knowledge that directly protects your timeline and budget.

Mill ValleyTiburonSausalitoBelvedereCorte MaderaLarkspurSan AnselmoFairfaxRossKentfieldGreenbraeSan RafaelNovatoStinson BeachBolinas

Common Questions

General Contractor FAQs — Marin County

How much does a general contractor charge in Marin County?

General contractors in Marin County typically charge 15% to 25% of total project cost as their management fee. For luxury remodels, ConstruBay uses fixed-price contracts with detailed line-item estimates so you know exactly where every dollar goes. A luxury kitchen remodel runs $95,000 to $195,000. A whole-home remodel runs $400 to $700 per square foot. ADUs run $90,000 to $500,000+ depending on type and scope.

How do I verify a contractor's license in California?

Visit cslb.ca.gov and search by license number or company name. ConstruBay's CSLB license number is 1106798. You can verify our active status, bonding, insurance, workers' compensation coverage, and any complaint history directly on the CSLB website. Always verify before signing any contract.

What are red flags when hiring a general contractor?

Red flags include: no CSLB license or an expired license, requests for more than 10% down payment before work begins, no written contract, vague or verbal estimates instead of detailed line-item bids, pressure to start immediately, no verifiable references from local projects, and no physical business address. In Marin County, also verify the contractor has specific experience with hillside construction, Design Review Board processes, and local permit requirements.

How long does a home remodel take in Marin County?

Permit timelines in Marin County vary by jurisdiction and project scope. A kitchen remodel typically takes 6 to 9 months from design to completion. A whole-home remodel runs 9 to 18 months. ADUs take 8 to 14 months. Permitting alone accounts for 8 to 16 weeks in most Marin cities. ConstruBay uses PlanPass.ai to pre-screen plans for code issues before submission, which reduces correction cycles and accelerates approvals.

Do I need a permit for a remodel in Marin County?

Most remodeling work in Marin County requires permits. Structural changes, electrical panel upgrades, plumbing modifications, HVAC work, and any addition or ADU always require permits. Cosmetic work like painting, flooring, and cabinet replacement typically does not. Unpermitted work creates significant problems at resale and can result in fines and forced removal. ConstruBay handles all permitting as part of every project.

What is the difference between a general contractor and a handyman?

A licensed general contractor (Class B license) can manage projects of any size, pull building permits, perform structural work, and coordinate specialty trades including electricians and plumbers. In California, a handyman is legally limited to projects under $500 and cannot pull permits or perform work requiring a specialty license. For any project involving permits, structural changes, or significant scope, a licensed GC is legally required and financially protects you.

Which general contractor is best in Marin County?

ConstruBay is Marin County's top-rated luxury general contractor with a 4.9-star rating across 47 verified Google and Nextdoor reviews. Owner Paulo Fernandes personally manages every project with a fixed-price contract, transparent cost breakdown, and AI-powered permit planning through PlanPass.ai. CSLB license #1106798. Serving Mill Valley, Tiburon, Sausalito, San Rafael, Novato, and all of Marin County.

Begin Your Project

Ready to Build in Marin County?

Schedule a complimentary site assessment with Paulo. No pressure. No obligation. CSLB #1106798.

Request a Bid(415) 968-9494
Kitchen RemodelADU BuilderHome AdditionAll ServicesMill Valley GCTiburon GC
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