Build an ADU in the Bay Area —
Designed, Permitted & Built In-House
Bay Area ADUs add real property value and steady rental income. Mayer’s handles every step — feasibility, design, permit navigation, and construction. One team. Full accountability. From first drawing to final inspection.
Every Bay Area city runs its own ADU permit process — San Mateo County setbacks read differently than Santa Clara County’s, and Palo Alto adds a heritage tree review that most other cities don’t require. We’ve filed across both counties and know what each jurisdiction needs before we walk in. In-house design team, same crew every day, no subcontractors, all materials sourced by us. CA License #1063024.
Trusted by Bay Area Homeowners & Industry Leaders
Real reviews. Real awards. From the platforms homeowners trust most.
Everything In-House. Nothing Outsourced.
Design, permits, materials, and construction — all managed by one team that's accountable for every detail.
End-to-End Permit Navigation
Bay Area ADU permitting is complex. We handle feasibility studies, architectural plans, city permit submissions, utility coordination, and all inspections. You don’t touch a single form.
JADU, Detached & Garage Conversions
We build every ADU type — detached backyard units, JADU conversions, garage conversions, and second-story additions. Sized for your lot, compliant with your city’s codes.
Rental-Ready Finish
Fully finished interiors — kitchen, bathroom, flooring, lighting, and appliances. Move-in ready for your tenant or family member from day one.
Recent Bay Area Projects
Every project designed by our in-house team, built by our crew.
The Bay Area ADU Builder That Handles Everything
ADU projects fail when you’re coordinating five different contractors. We’ve built ADUs from San Jose to Atherton and know exactly what each city requires. One team. One point of contact. Full responsibility.
Bay Area Permit Experts
We’ve navigated ADU permits in San Jose, Saratoga, Los Altos, Palo Alto, Menlo Park, and beyond. We know what each city’s building department expects.
In-House Architectural Plans
Our team prepares all drawings and plan sets in-house. No waiting on a third-party architect who’s not accountable to your timeline.
Real Rental Income Results
Our Bay Area ADU clients see rental income from $2,000 to $4,500/month depending on location and finish level.
On Schedule, Daily Updates
A dedicated project manager on-site. We don’t disappear after the permit is pulled.
How a Mayer's ADU Works
No surprises. No runaround. Just a clear process from first call to finished project.
Site Visit & Feasibility
We assess your lot, check zoning and setbacks, and tell you exactly what ADU type is possible before any money changes hands.
Design, Plans & Permits
Our in-house team prepares full architectural plans and submits all permits to your city. We track approval and handle any revision rounds.
Build & Deliver Rental-Ready
Construction with daily updates. Fully finished interior — your ADU is move-in ready for your first tenant.
No pitch.
Just an honest
estimate.
We come to your home, understand your vision, and give you a real number. No vague estimates, no pressure — ever.
- ★★★★★ 5 Stars on Google
- In-house crew — no subcontractors, ever
- 500+ Bay Area families · Since 2009
- CA License #1063024
What a Bay Area ADU Is Worth
The numbers are real. Bay Area ADUs consistently add significant property value and rental income.
$400K
$4.5K/mo
Months
1,200 sqft
Values based on Bay Area market data. Actual results vary by city, lot size, and finish level.
ADU Permit Timeline by Bay Area City
We’ve navigated ADU permits across the entire Bay Area. Here’s what to expect in each city.
| City / County | Permit Timeline | Notes |
|---|---|---|
| Palo Alto | 4–6 months | CalGreen compliance required |
| Saratoga | 3–5 months | ADU process, proven since 2020 |
| Los Altos | 3–5 months | Express ADU review track available |
| Menlo Park | 4–7 months | Online permit portal, utility coordination key |
| Santa Clara County | 3–6 months | Strong ADU ordinance, broad lot eligibility |
| San Mateo County | 4–8 months | Online portal, design standards vary by city |
Timelines are estimates. Mayer’s tracks every permit and handles all revision rounds.
Heard From Bay Area Homeowners
Real feedback from real projects across the Peninsula and South Bay.
Our detached ADU was done in 4 months and our tenant moved in within the week. Mayer’s handled every permit, utility connection, and finish detail. The rental income paid for itself faster than we expected.
We converted our detached garage into a full 1-bedroom ADU. Nathan managed the project personally and the permit process was completely hands-off for us. Beautifully finished — better than we imagined.
Built a 750 sq ft JADU for my mother. The team knew exactly what Los Altos requires and got through permits faster than I thought possible. It’s a real home, not a converted shed.
ADUs are the most permit-heavy project a homeowner can take on in the Bay Area, and most of the horror stories I hear come from contractors who handed off the permit process to the owner. We don’t do that. We pull the permits, we respond to plan check comments, we schedule every inspection — you just wait for us to tell you it’s ready to move in.
Why Bay Area Homeowners Choose Mayer’s for ADU
ADU permitting in Santa Clara County and Peninsula cities is genuinely complicated — setback rules, deed restrictions, utility connections, and plan check comments that can add months if you don’t know the process. We’ve been through it dozens of times in San Jose, Los Altos, Saratoga, Palo Alto, Sunnyvale, and every city in between, so we know exactly what the plan checkers want to see before we submit.
Mayer’s Construction builds ADUs across the Bay Area — detached ADUs, garage conversions, attached additions, and Junior ADUs in San Jose, Los Altos, Saratoga, Palo Alto, Sunnyvale, Mountain View, Cupertino, Santa Clara, Burlingame, Redwood City, and San Mateo. We’re a licensed California ADU contractor (License #1063024), family-owned since 2009, and we handle every phase in-house: design, permits, construction, and final inspections. Call (888) 394-4041 to start your Bay Area ADU project with a free on-site consultation.
Garage-to-ADU Conversions
Yes — the garage you park bikes in today can legally become a full ADU with its own kitchen, bathroom, and private entrance. The structure is already standing; it just needs the right design and the right permits.
Conversions suit tight Peninsula and South Bay lots: the slab, walls, and roofline are usually already in place, so you build inside what you already own — you keep your yard and sidestep the setback and lot-coverage rules that leave little room for a new structure. State ADU law has steadily made it easier to add a second unit, most Peninsula cities now process conversions through a faster approval path, and the build phase is typically shorter than a ground-up ADU.
In-House Design Team
Your conversion is designed by our own designers — the people drawing your kitchenette and bath are the same people accountable for building it.
3D Renderings First
You see realistic 3D renderings of the finished space before construction starts — no surprises about layout, light, or finishes.
Permits Handled
We manage the permit process with your city and track each city’s specifics, so your project is designed to approve the first time.
Direct Material Sourcing
We source materials directly and self-perform the core work — one team, one point of contact, one standard of finish.
Mayer’s Construction is family-owned, San Jose-based, and CA licensed (#1063024), building ADUs across the Peninsula and South Bay since 2009.
ADU Questions, Answered
Honest answers about timeline, permits, licensing, and how we work.
An ADU Builder Near You: Bay Area Cities We Serve
Searching for an ADU builder near me or a garage conversion near me? You’ve found one — Mayer’s Construction is a San Jose-based, family-owned, licensed ADU contractor (CA License #1063024) building across the Peninsula and South Bay since 2009. We build in your neighborhood: click any city to see local projects and city-specific details.
We also handle all services in-house — one contractor for everything:
Your Bay Area ADU
Starts with One Call
Schedule your complimentary in-home consultation. We come to you, assess your project, and give you an honest scope — no pressure, no obligation.
SKIP THE WAIT
Book Your Free Consultation — Right Now
Pick a time that works for you. We’ll call you, walk through your project, and give you an honest plan — no pressure, no obligation.
Prefer to call? Reach us at (888) 394-4041
Get Your Free Bay Area ADU Estimate
We'll schedule your complimentary in-home visit within days. No pressure. No obligation.