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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.

The lifespan of a hurricane garage door depends on several factors, such as the quality of the materials, how well it's maintained, and the local weather conditions. As a rule of thumb, most hurricane garage doors can last anywhere from 15 to 30 years or more with proper care. However, if you start to see visible damage, the garage door becomes noisier, or you experience difficulty operating it, it may be time for a replacement.

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.