It would cost about $13,000 to convert a garage. The first step is to insulate the garage. The insulation will cost about $2,500. Next, you will need to install drywall. This will cost about $5,000. Finally, you will need to paint and trim the garage. This will cost about $5,500.

It would vary depending on the size of the garage, the materials used, and the contractor you hire, but it could cost anywhere from a few thousand dollars to tens of thousands of dollars. Some things that you'll need to keep in mind when converting a garage are insulation, moisture barriers, proper ventilation, and making sure that the space is up to code. You may also want to add electrical outlets and lighting, or install a heating or cooling system.