Garage Conversion Cost Calculator

It depends on what you build. State ADU law bars a city from requiring replacement parking when a garage is converted into an ADU or JADU, and it waives new parking for many ADUs near transit. A conversion to plain living space that is not an ADU is a separate question and falls under local zoning, which may still require covered or off-street spaces. Standards vary by jurisdiction, so confirm the rule with your building department before you commit to a layout.

Usually, but it depends on what the space becomes. A permitted ADU or JADU with a kitchen and bath creates rentable square footage that an appraiser can count as living area. Unpermitted work adds far less and can complicate a sale, and removing the only covered parking on a street where every comparable home has a garage can work against you. Pull permits and finish the space to the standard of the rest of the house.

Both can decide whether a garage is convertible at all. Habitable rooms generally need about 7 feet of finished ceiling height, and a garage that is already low loses more once you add insulation, a ceiling assembly, and any floor build-up. The slab matters just as much: garage slabs are often sloped toward the door, poured thin, and built without a vapor barrier or perimeter footings, so they may need leveling, a moisture barrier, or new footings. We check both on site before design starts.