All the Value of an ADU. A Fraction of the Cost.
The most cost-effective way to add a bedroom, office, or rental unit to your home.
A garage conversion is the fastest and most affordable way to add functional living space to your Bay Area home. Custom Home handles everything from design and permits to construction, with the same design transparency as our custom homes.
Why Choose Custom Home for Garage Conversions
Most Affordable Option
Leverage your existing structure to minimize costs. No new foundation or roof needed in most cases.
Fast Timeline
Garage conversions typically complete in 4-6 months. The fastest path to a new living space.
Full Design Included
Even for conversions, our design phase ensures you see the finished space before work begins.
Permit Management
We navigate local building codes and secure all necessary permits for your conversion.
Years in the Bay Area
Licensed since 2005. 162+ projects completed across the South Bay, Peninsula, and beyond.
BuildZoom Rated
Ranked in the top 1% of Bay Area contractors based on qualifications, performance, and reliability.
Design-First Process
See every detail in 3D before construction. Our two-phase approach separates design from build so you never commit blind.
Change Orders
When you follow our full two-phase process from A to Z, every decision is locked in during design. No mid-project surprises.
Itemized Pricing
Every material, every line item, visible before you sign. No allowances, no hidden fees.
What to Expect
Every project is unique. Final cost depends on garage size, finishes, and plumbing requirements.
Key Cost Factors
- Garage size and condition
- Plumbing additions
- Finish level
- Permit requirements
All pricing is approximate and subject to change. Every project is unique, and final costs are determined on a project-by-project basis during our design phase.
Ready to discuss your garage conversions project? Call (888) 306-1688 or schedule a consultation.
What We Promise on Every Project
You'll Hear from Us Every Week
Weekly progress updates with photos and milestone reports. A dedicated project manager as your single point of contact. We respond to questions within 24 hours.
Every Subcontractor Is Licensed and Supervised
We maintain long-term relationships with licensed, insured trade partners. Our project managers directly supervise all work on your property. No unsupervised labor.
We Prioritize What's Behind the Walls
Foundation, framing, waterproofing, electrical, and plumbing are engineered and inspected before any finish work begins. Structural integrity always comes first.
We've Never Walked Away from a Project
162+ projects completed across the Bay Area since 2005. Every one delivered. When you hire Custom Home, your project gets finished.
Frequently Asked Questions
How much does a garage conversion cost?
Garage conversions in the Bay Area typically range from $120,000 to $150,000 depending on size, finishes, and whether plumbing is added. This is significantly less than building a new structure. Our design phase gives you the exact number before construction starts.
Do I need a permit to convert my garage?
Yes. A building permit is required for any garage conversion. We handle the complete permitting process with your local jurisdiction.
Can I still park in my garage after conversion?
A full conversion transforms the entire garage into living space. However, many Bay Area cities have relaxed parking requirements for ADU conversions under California state law.
What is your permit success rate for garage conversions?
We have a strong track record with garage conversion permits across Bay Area jurisdictions. California state law (AB 68, SB 13) has streamlined ADU permitting significantly. We handle the complete process, from initial plans through final inspection, and know the specific requirements for cities like San Jose, Palo Alto, and Los Gatos.
How do you select and manage your subcontractors?
Every trade partner we work with is licensed, insured, and has a proven track record with our team. We maintain long-term relationships with our subcontractors, which means consistent quality and accountability. Our project managers directly supervise all work on your property.
What happens if you discover unexpected issues during the conversion?
Older garages sometimes reveal surprises like outdated wiring or foundation concerns. When this happens, we document the issue, explain your options, and provide exact costs for any additional work before proceeding. Nothing changes without your written approval.
Where We Offer Garage Conversions
South Bay
Peninsula
East Bay
Tri-Valley
San Francisco
Coastal
Monterey Bay
Garage Conversions Insights & Guides
Keep Your Garage or Convert It to an ADU? The Bay Area Math
Should you keep your garage or convert it to an ADU? Compare Bay Area garage conversion costs, rental income, and break-even timelines with real numbers.
Read article cost analysisHow Much Does a Garage Conversion Cost in Fremont? (2026)
Fremont garage conversions cost $110K-$185K+ in 2026. See cost breakdowns by conversion type, permit fees, and tips for Fremont homeowners.
Read article cost analysisHow Much Does a Garage Conversion Cost in San Jose? (2026)
San Jose garage conversions cost $100K-$180K+ in 2026. See cost breakdowns by conversion type, permit fees, and neighborhood pricing factors.
Read articleLast updated: April 2026