Custom ADU Construction in the Bay Area
Maximize your property’s value, add livable space, and unlock rental income with a tailor-made Accessory Dwelling Unit designed and built by Cotfort.
Everything You Need for a High-Quality ADU
Cotfort delivers full-service ADU construction from the ground up. From design to move-in, we manage each step to ensure your new unit is legal, livable, and beautifully built.
Architectural Design & Planning
Our expert team creates blueprints and space plans tailored to your lot, lifestyle, and ADU goals.
Full Permitting & Compliance
No paperwork headaches we handle local zoning, permit applications, and code compliance so you don’t have to.
Ground-Up Construction
Whether it’s a backyard cottage or garage conversion, we build every ADU from the foundation with durable materials and detailed craftsmanship.
Kitchen, Bathroom, & HVAC Systems
We install modern kitchens, bathrooms, and heating/cooling systems that make your ADU a fully functioning, comfortable home.
Utility Tie-ins & Final Inspections
From water and sewer to electrical—your ADU will be safely connected and pass all required inspections before move-in.
Smart, Local, and Stress-Free ADU Construction
We’re not just builders we’re your ADU partners. From zoning knowledge to craftsmanship, we make adding a legal, stylish unit to your property seamless.
Zoning & Code Experts
Deep understanding of local regulations ensures faster approvals and zero legal headaches.
All-in-One Design & Build
Seamless coordination from planning to construction—no need to hire multiple teams.
Garage or Ground-Up Builds
Whether it's a detached unit or garage conversion, we bring it to life with precision.
Great for Rentals or Family Use
Perfect for passive income, multigenerational living, or aging-in-place solutions.
Projects Completed
5-Star Reviews
Years of Combined Team Experience
Focused on Bay Area Homes
Proudly Serving the Bay Area
Take a look at the Bay Area cities we serve — and see where we’ve helped homeowners upgrade their spaces.
ADU Construction Project Showcase
Explore our custom-built Accessory Dwelling Units (ADUs) — where we turn backyards into fully functional, stylish, and code-compliant living spaces.
No portfolio items found.
Our Seamless ADU Building Process
From idea to inspection—here’s how Cotfort brings your ADU to life:
Step 01
Feasibility & Site Assessment
We evaluate your property, zoning regulations, and space potential to ensure the ADU is viable and within code.
Step 02
Architectural Design & Estimate
Custom plans tailored to your vision, along with a clear project timeline and budget estimate.
Step 03
Permit Submission & Approvals
Our team handles all paperwork, zoning compliance, and follows up with city departments for quick approvals.
Step 04
Groundwork & Construction
From foundation to roofing, we manage every stage with licensed professionals and strict quality control.
Step 05
Final Inspections & HandoffPermit Submission & Approvals
We coordinate all utility tie-ins, schedule final inspections, and walk you through your ready-to-use ADU.
Ready to Build Your ADU?
From concept to completion, we handle it all. Get in touch for a personalized estimate today.
Frequently Asked Questions
Planning to build an ADU? Here are quick answers to the questions we get asked the most.
Can an ADU work for more than just rental income?
Yes. While many homeowners build ADUs to generate rental income, they’re also perfect for multi-generational living, guest houses, home offices, or even a private retreat. Cotfort designs ADUs with flexibility in mind so the space can evolve as your needs change.
Can I customize my ADU design, or are they all prefabricated?
ADUs are not one-size-fits-all. Cotfort offers custom ADU design tailored to your property, style, and goals. Whether you want a modern studio, a two-bedroom unit, or a duplex-style build, your ADU can be fully unique.
Can I build an ADU if my property is on a slope or irregular lot?
Yes, but it requires careful planning. Cotfort specializes in evaluating unique lots and creating custom ADU solutions. From hillside builds to narrow alley-access units, we design ADUs that work within challenging spaces.
What’s the difference between a detached ADU and an attached ADU?
A detached ADU is a standalone unit in your backyard, while an attached ADU is connected to your home, such as converting a garage or basement. Both options add value, and Cotfort helps determine which fits your property best.
Can I retire into an ADU?
Absolutely. Many homeowners build ADUs as future-proof housing. You can live in the ADU later and rent out the main home, or vice versa. This flexibility makes ADUs a smart investment for long-term planning.
