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It is typically cheaper to build a garage than to buy a prefab one if you can provide most of the labor yourself. If you plan to hire a contractor for the entire build, a prefab garage or kit will likely be less expensive. However, even with a garage kit, you may still need to hire professionals to install the foundation, concrete floor, and handle electrical and plumbing work. If you are not an experienced builder, it can be a worthwhile investment to hire a local garage builder who can manage all aspects of the project, including coordinating other necessary professionals.

While it depends on door condition, the painter’s level of expertise, and weather conditions, it’s safe to set aside two to three days to complete this project, especially if you anticipate adding multiple coats of paint, which can take eight to 12 hours to dry. Your professional should be able to provide an estimate for the project timeline.

The best method for painting a garage door depends on the door's design and the finish you want to achieve. For the most professional-looking finish, especially on doors with panels or intricate details, a paint sprayer is an excellent choice. It can easily get into hard-to-reach places and provide a smooth, even coat.

If you don't have a sprayer, or if your door is flat, a combination of a roller and a brush is the most effective approach. Use a roller for the large, flat sections to cover the area quickly and efficiently. For the best results, experts recommend a roller with a nap between ⅜ and ¾ inches thick; natural fibers can also help ensure an even coat.

A brush is essential for handling the finer details. Use it to paint grooves, angles, small panels, and the edges of the door where you need more control.

Regardless of the tools you use, it's a good idea to step back after the main application to review your work and use a detail brush to touch up any missed spots.

Garage door insulation can last anywhere from 20 to 100 years depending on the type of insulation. Cellulose has the shortest lifespan coming in at between 20 and 30 years, while spray foam, mineral wool, and fiberglass can last between 80 and 100 years with proper maintenance. 

Humidity plays a role in how long more susceptible insulation materials—like fiberglass—last. Once fiberglass batts reach the 15-year mark, you'll need to routinely inspect your insulation to ensure that it is in mint order.