A Practical Guide To Planning Your 2026 Build

A simple garage conversion might range from $60,000 to more than $150,000. In Los Angeles, ADU conversions start at $60,000, with conversions averaging around $75,000 according to contractors Anna and Vahik. If the starting point is not a fully enclosed garage, our carport garage conversion guide may help frame the extra structure, enclosure, and comfort work that may be involved.

Garage conversions can still vary widely. Contractors have converted Los Angeles garages with existing plumbing and electrical service for as little as $58,000, while other conversions have cost closer to $196,000 or more, depending on the amount of work required.

In the tri-state area of New York, New Jersey, and Connecticut, garage conversion costs can range between $35,000 and $60,000 on average, according to Sweeten contractor Michael, though he has seen projects go upward of $100,000. For a comfort-focused garage fit-out, Michael notes that plumbing for a toilet, insulation, and heating should not cost more than $45,000, though extras like bars, fridges, cooking equipment, or decorative wall paneling can raise the total.

A garage conversion ADU can be more cost-conscious because the basic structure already exists. Instead of building a new unit from scratch, the project may begin with an existing slab, roof, walls, and sometimes electrical or plumbing systems.

One thing to keep clear: a garage conversion and a legal ADU are not always the same thing. A simple studio, office, or hobby room may not need the same scope as a self-contained ADU with a bathroom, kitchenette, separate entrance, and local approvals. That distinction can change the budget quickly. For homeowners still shaping the scope, these garage conversion ideas could help show the difference between a simple finished space and a more involved living unit.