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This is a matter of personal preference. However, building a detached structure is generally considered better if you intend to rent out the new space. The advantage to going with an attached garage addition is that you may pay less for plumbing, HVAC, and other features because you can use the existing systems from your home to carry over piping and wires.

A prefab, or prefabricated garage, requires far less construction work than one with a foundation and frame, but it’s not nearly as desirable and may not be a worthwhile option. A prefabricated garage won’t be as durable or long-lasting, and it doesn’t provide the same protection for your belongings and vehicles. Plus, you can use a standard garage for more uses—like living space—whereas a prefab garage only serves as a space for storage. Lastly, building a traditional garage will add to your home value, while a prefab garage usually won’t.

An average two-car garage size is about 580 square feet. A common dimension for a two-car garage is 24-feet deep by 24-feet wide, as measured by the interior width. However, the manufacturing of larger vehicle sizes means many homeowners want to build bigger garages. It’s not uncommon for a two-car garage to be 30-feet by 30-feet.

Due to space restrictions, some homeowners choose to build an above-garage extension. This second-floor area can be used for storage or living space, but it’s more involved than your standard garage extension project. For example, you might need to pay for foundational or structural reinforcement if your current garage can’t handle the extra load. Expect to pay $25,000 to $100,000 to add a room above the garage.