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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.

A garage counts toward the official square footage of a house if it is considered livable space. For a garage to qualify, it typically needs to be attached to the home and have permanent finishings like proper insulation, finished walls, and ceilings. It must also be livable year-round, which requires adequate heating, cooling, and ventilation. The exact legal requirements for what constitutes living space can vary by location.

You’ll usually need to prime a garage floor before painting—especially if the floor is unpainted. Garage floors are made from concrete, which is porous and produces dust. The dust can contaminate the paint and cause issues with adherence. 

Primer creates a barrier and gives you a clean surface to work on. It also minimizes absorption to help give you an even, pro-looking paint job. Make sure you choose a primer that’s specifically designed to cover concrete flooring.