California's Trusted ADU Builder

California's Trusted ADU Builder. 3,500+ Projects Delivered. Free Custom Quote in 24 Hours.

We’re a licensed design build firm serving every California neighborhood. Our team handles the feasibility study, the permits, the design, and the construction, so you stay in control and on budget. Every quote request gets a personal reply within one business day.

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From Zoning to Final Walkthrough, We Handle It All Under One Contract

Most ADU projects go sideways because the homeowner ends up juggling three or four vendors. With us you have one point of contact from the first site visit to the day we hand you the keys. One contract, one team, one partner you can hold accountable. You stay in control and on budget every step of the way.

Project Management - Inspections

You get one project manager from day one. Communication stays simple and the schedule stays on track.

Custom Design and Plans

Our in house designers shape every plan around your lot, your budget, and the way you actually live.

Permit Approval and Compliance

A dedicated permit technician moves your paperwork through California about 30% faster.

Full Service Construction

Licensed crews, a fixed price contract, and design, permits, and construction finished on time.

By Bedrooms and Square Footage

Find the Right ADU Size for Your California Property

Looking at a 1 bedroom ADU, a 2 bedroom, or something in between? Every Urbatect ADU is custom built, so think of these as popular starting points, not limits. Tell us your space and we design around it.

Arcilla ADU 8
Around 250 to 500 sq ft

Studio / Junior ADU

Studio, 1 bath
A good fit for rental income, a home office, or a guest suite on a smaller lot.
Governor ADU 1
Around 500 to 700 sq ft

1 Bedroom ADU

1 bed, 1 bath

Our most popular size. Great for rental income or a private space for family.

Gallegos ADU 1
Around 750 to 1,000 sq ft

2 Bedroom ADU

2 bed, 1 to 2 baths
Built for growing or multigenerational families who need a full home.
Around 1,000 to 1,200 sq ft

3 Bedroom ADU

3 bed, 2 bath
Maximum living space. A true second home right on your property.

Need something in between? We build to your exact square footage. Most California ADUs land between 400 and 1,200 sq ft.

Your ADU, Built Around Your Requirements

No two homes are the same, and no two homeowners are either. Tell us how many bedrooms you need, the square footage you’re after, and how you plan to use the space. Our in house design team builds your ADU around those exact requirements. From feasibility and design to permits and construction, we handle everything under one contract, so you get the home you pictured without managing a single vendor.

Customize every detail

You choose the details. We handle design, engineering, permits, and the build.

6 Reasons California Homeowners Trust Urbatect With Their ADU

1

One Contract, One Team

Design, permits, and construction all stay in house. No miscommunication between vendors.
2

Custom Design For Your Lot

Our in house designers get the most out of every square foot inside California’s setback and zoning rules.

3

Fixed Price Transparency

Your price is locked. You’re protected from labor and material cost jumps for 16 months.
4

30% Faster Builds

Our process is dialed in, so projects finish quickly without cutting corners.
5

Dedicated Permit Technician

We get California permits approved about 30% faster by managing the city from start to finish.

6

3D Visualization Before Build

Walk through your finished ADU in 3D before a single shovel hits the ground.
Arcilla ADU 3

Proudly Building ADUs Across Every California Neighborhood

Up in the hills or down near the bay, our team knows the local zoning, the permit quirks, and the construction realities of your site.

Our Projects

Our Completed Projects

Arcilla ADU

San Diego
375 sq ft, single story, compact design with a skylight
Camden ADU

Camden ADU

Oakland
222 sq ft, single story, compact design with a murphy bed

Castro Valley ADU and Office/Gym

Castro Valley, CA
798 sq ft ADU plus a 639 sq ft office and gym, single story, with a new driveway
Governor ADU 1

Gallegos ADU

Watsonville
750 sq ft, single story, with an exterior deck and front porch
Millbrook Residence 1

Governor ADU

Harbor City

704 sq ft, single story, fully ADA accessible

Phan ADU

San Leandro
750 sq ft, single story, designed for flexibility

Ready to Build ADU Plans

Skip the blank page. Start from our library of ready made plans that are ready to build, then customize them to fit your lot.

Model 10

800 sq ft, 2 bed, 2 bath

Model 09

800 sq ft, 2 bed, 2 bath
Build ADU Plans

Model 08

791 sq ft, 2 bed, 2 bath
3,500+
Projects Delivered Across California
25 to 30%

Faster Permit Approvals in California  

4.9/5
Average Google Reviews Rating

Build Smarter. Build Faster. Build With Urbatect.

Detached ADU

A standalone home in your backyard for maximum privacy and rental value.

Attached ADU

Add living space without giving up your yard.

Garage Conversion

The fastest path to a new ADU.

Basement and In Law Suite

Basement and in law suite transformations.

Rated 4.9 Stars by 100+ California Homeowners on Google

“Urbatect handled our permits and design without a single delay. The communication was outstanding the whole way through.”

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Sarah M.

California, CA

“We had a tight budget and they stuck to the fixed price. The project came in on time and looked exactly like the 3D walkthrough.”

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David K.

Berkeley, CA

“The permit technician knew every California inspector. Approvals came back faster than anyone else had quoted us.”

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Priya R.

California Hills

“Quality of finishes is incredible. Our tenant moved in two weeks after the final walkthrough.”

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Marcus T.

Alameda, CA

“One contract, one team, exactly as promised. No finger pointing and no surprises.”

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Linda H.

California, CA

“From the first site visit to the final inspection, the whole process felt organized and professional.”

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James P.

San Leandro, CA

How We Build ADUs, the Urbatect Way

1

Free Consultation and On Site Visit

Day 1

We walk your lot and talk through your goals and budget.

2

Data and Design Development

Our in house designers turn your requirements into real plans.

3

Feasibility and Cost Review

A transparent fixed price proposal with no surprises.

4

Permits

Our permit technician handles the city from start to finish, about 30% faster.

5

Build

Licensed crews on site with weekly progress updates.

6

Final Walkthrough

We hand over the keys to your finished ADU.

Independently Recognized as a Top California Design Build Firm

Final Walkthrough
Best of Houzz Service 2022
BuildZoom Verified
BBB A Rating

What Makes Urbatect Different

12 Month Price Lock

Your price is protected against material and labor cost increases.

Permit Specialist On Staff

A dedicated technician who moves California approvals along faster.

Weekly Progress Updates

You always know exactly where your project stands.

10 Year Structural Warranty

Build with long term peace of mind.

Find the Right ADU For Your California Property

Garage Conversion

Includes

Attached ADU

Includes

Detached ADU

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Frequently Asked Questions About Building an California ADU

How long does it take to build an ADU in California?

Most California ADUs take 4 to 8 months from permit to completion. That’s about 30% faster than the industry average, thanks to our dedicated permit technician and our in house design build team.

Every project is custom. Site, size, finishes, and scope all change the number. After a free consultation we send you a transparent fixed price quote. Request your free custom quote and we’ll respond within one business day.

California ADU law limits what HOAs can restrict. We review your specific situation during the feasibility phase so we know your project is approvable before we go further.

Yes. Rental income is one of the most common reasons Oakland homeowners build an ADU. We design with rentability in mind, including a separate entrance, a full kitchen, in unit laundry options, and more.
 

Most Oakland ADUs land between 400 and 1,200 sq ft. We build everything from junior studios to 3 bedroom ADUs, all shaped around your lot, your zoning, and your goals.

Yes, and we handle the entire permit process for you. Our dedicated permit technician knows Oakland’s process inside and out.

We walk you through your financing options during the consultation, including common HELOCs, construction loans, and ADU specific programs.

Ready to build your California ADU?

Get a personal response and a free custom quote within one business day. No obligation and no pushy sales.