The California ADU Experts

Our Services

Devlin Builder Co. is a custom home builder who specialize in Accessory Dwelling Units commonly known as Granny Flats.
Let us help you build one today!
theguesthouse

Detached ADUs

Granny flats, or in-law units, are informal terms for ADUs that are mostly associated with backyard cottages or additions to single-family homes.

coastal_7

Conversion ADUs

Conversion ADUs are created from existing space on your property, such as a garage, basement, or other permitted structure. Not all ADU companies have the knowledge or experience required to pull off a successful conversion ADU, but Devlin Builder Co. does.

pedro-miranda-3QzMBrvCeyQ-unsplash

Consulting & Project Management

Navigating the feasibility of your dream ADU can be difficult. The ever changing California law combined with local jurisdictions can make getting started overwhelming. We can handle all the initial heavy lifting so you know if the project is possible.

design-meet-revise-repeat-thumbnail

Design & Planning

Once you’ve confirmed that your project is feasible, it is time to start designing your unit. This is where the fun with ADU planning really begins. With a better understanding of the particulars of your space and the code requirements for a legally recognized ADU, you can begin working with our architect to design the overall concept of your ADU.

Why Choose Us

Our Process

Your hand will be held from start to finish with consistent communication along the way.

Experience

We know the way local jurisdictions look at ADU plans and we will ensure a seamless process along the way. 

Quality

With experience comes quality. We produce a high end finish at a DIY cost.

Our Team

Our collective experience and constant team approach produces the best possible outcome. 

About Our Company

DEVLIN BUILDER CO. a Southern California based General Contractor focused solely on Accessory Dwelling Units (ADUs, Granny Flat, In-law Suite.) Passionate about building high quality structures, Mark Devlin founded DBC to assist the community in navigating the complex world of ADUs while combating the California housing crisis.

OUR COMMITMENT TO AFFORDABLE HOUSING

We believe that accessory dwelling units are an important part of the solution to creating more affordable housing in our communities. The Bay Area’s current housing shortage will not be solved with ADUs alone, but they offer one of the most immediately available ways to increase the supply of safe and decent housing. If you are a property owner with underutilized space or existing unpermitted units, our team is here to help.

Client Testimonials

"We cannot recommend the team at Devlin Builder Co. highly enough. Our project involved demolishing an existing pergola in our backyard to make way for a custom 900 sq. ft. ADU, and the outcome surpassed our wildest expectations. The final product is nothing short of spectacular, providing us with a beautiful and functional space that has become a cherished gathering place for our friends and family on weekends. Devlin Builder Co.'s professionalism, craftsmanship, and attention to detail have truly made our dream a reality."
Daniella G.
"We are currently at the halfway mark in the completion of our approximately 400 sq. ft. detached ADU, and our experience with Mark and his team has been nothing short of amazing. What stands out most is their profound knowledge of state laws, which was instrumental in overcoming obstacles that had previously stumped another builder. Their expertise in navigating both the laws and local codes breathed new life into a project that we had thought was dead. We are immensely grateful for their dedication and skillful handling of our project!"
Steve R.
"Choosing Devlin Builder Co. for our project was a decision that brought about a significant transformation in our home life. Their comprehensive approach as a full-service firm—including design, planning, and construction—made the entire process seamless and stress-free. The ease of collaboration with their team, from designers to project managers, was truly remarkable. They prioritized our needs and desires, ensuring that the final outcome not only met but exceeded our expectations. Thanks to Devlin Builder Co., our home life has been beautifully transformed."
James D.

Are you ready to build your dream ADU?

There are many reasons to start the process now! Don’t wait!

CALL US TODAY!