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You can convert your garage into an ADU. You’ll need to follow local building codes to ensure your new unit is up to code. For the most part, building an ADU in an existing building is more affordable than building a new one. Even so, consider the condition of your garage before making a decision. Not all garages are in shape for a smooth conversion to an ADU, and renovations can add up in cost.

The average cost to build a garage is $28,670 , but a lot of variables affect the final price, including the cost of labor in your area, the size of the garage, and the type of structure you build. Whether the garage is attached or detached also affects the cost. A standalone detached garage costs more than a garage that is attached to your home.

For a garage to count as living space—and towards your home’s total square footage—it needs to be attached to the rest of your home and have permanent finishings such as proper insulation, finished walls and ceilings, and adequate ventilation. It also needs to be livable at all times of the year, so it should be heated if it gets cold in the winter and cooled for hot summers.

The cost to build a detached garage for two cars costs about $26,400 on average. Prices range from $19,200 to $33,600, depending on your location, the garage size, height, materials, and site prep required. Additional cost factors include any plumbing, electrical wiring, and insulation. If you need to build a concrete foundation for a new detached garage, you can expect to pay $1,000 to $8,600 for this essential addition.