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The life span of a newly painted garage door depends on the quality of your paint, the material of the door, and the climate you live in. If you’re confident that you’ll maintain the door as best you can, you can expect the job to last between 5 and 10 years.

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.

Wood, steel, fiberglass, and aluminum are among the top building materials for a garage. Wood is highly customizable, naturally insulative, and durable in mild climates but can be expensive. Steel is lightweight, low-maintenance, and cost-effective, but it’s susceptible to rust. Fiberglass is low-maintenance and doesn’t shrink or expand in changing temperatures, but it can become brittle and crack from prolonged high winds and sun exposure.

Unlike steel, aluminum isn’t susceptible to rust and is low-maintenance, but its ultra-light weight makes it less durable than some materials, and it’s susceptible to saltwater damage, making it a poor choice for coastal homes.

Most heat in a garage is lost through air leaks in windows, doors, and walls. This is especially true if the walls are uninsulated, which is common in garages. Consider insulating your garage before installing a garage heater to ensure the heat it generates isn’t wasted, making it less efficient.