Garage Conversion and JADU Specialists
Converting space you already have is the cheapest route to a legal second unit, because the slab, the walls, and the roof are already there. A garage conversion is the common one, and in much of California it is also the fastest to permit. The work is unglamorous: raising the floor, insulating walls never meant to be lived behind, swapping the roll-up door for a wall and a window, and proving the result meets egress and fire separation. Basement and attic conversions belong here too, along with junior ADUs, which California caps at 500 square feet and lets share the main bathroom. This page is for firms that lead with conversion work rather than list it as one service among many, and most are Californian, because that is where the rules turned it into a product.
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San Francisco Bay Area design-build specialist in prefab garage and backyard conversions, approved by the City of San Jose and certified by California HCD, using a modular system that installs in three to four weeks.
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Orange County specialist with 65+ years of combined team experience in converting garages to permitted ADUs, serving Los Angeles and Orange counties with licensed contractors, engineers, and inspectors.
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Sherman Oaks-based specialist with 15+ years converting garages into rental units, home offices, studios, and guest suites across the San Fernando Valley and Los Angeles County.
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Los Angeles and Orange County builder specializing in garage conversions, detached backyard ADUs, and attached inlaw suites, with 100+ completed projects since 2017 and full licensing and bonding.
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Orange County loft and garage conversion specialists with over 2,400 completed projects. Known for third-car garage conversions, attic additions, and porch enclosures with fast turnaround times and quality craftsmanship.
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Long Beach-based garage conversion and ADU specialists with 25 years of experience. Focuses on certified legal garage conversions with a portfolio of completed before-and-after projects.
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Chicago's specialist in converting underused attic space into legal ADUs and rental units, with over 500 completed projects since 2013 and an A+ BBB rating.
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Southern California specialist in converting garages into ADUs and living spaces, operating for over a decade with consistent customer praise for quality, communication, and finishing work.
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Washington DC-area basement conversion specialist with 20 years of experience transforming basements into legal accessory apartments. Serves Northern Virginia, Maryland, and Washington DC.
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Los Angeles garage conversion specialist with 21 years of licensed, bonded experience, offering conversions designed for every home style and budget.
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Los Angeles-area garage conversion specialist established in 2010. Portfolio includes 25 completed projects with a focus on transforming garages into livable spaces.
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Anaheim-based garage conversion and ADU builder serving Orange County with a streamlined approach to turning existing garage space into permitted rental units.
Frequently asked questions
What types of spaces can be converted into an ADU?
While garage conversions are the most common, specialists in our directory also convert attics, basements, third-car garages, and porches into legal living units. Some contractors focus specifically on these underused areas to create rental units, home offices, or guest suites.
Can I find specialists if I live in Southern California?
Yes, there are many options serving Los Angeles, Orange County, and Long Beach. You can find experts covering the San Fernando Valley and even specialized teams in the San Francisco Bay Area.
Do these companies handle the permitting and legal requirements?
Most listed specialists focus on creating permitted and legal units. Several professionals are certified by the California HCD or have decades of experience ensuring conversions meet local building codes.
Are there specialists for areas outside of California?
Our directory includes experts in other regions, such as Chicago for attic conversions and the Washington DC area for basement remodeling. These specialists serve surrounding areas like Northern Virginia and Maryland.