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Sheet metal garage doors, particularly steel and aluminum, have the cheapest materials and installation. Experienced homeowners may cut and shape the metal themselves; however, you can buy prefabricated metal from a hardware store or pay a metal fabricator to shape the metal to your specifications. Steel and aluminum garage doors can cost as little as $500 and go up to $3,000.

For a garage to be included in a home's official square footage, it must qualify as livable space. This generally means it needs to be attached to the home and have permanent finishings like proper insulation, finished walls and ceilings, and adequate ventilation. To be considered livable year-round, it should also have heating and cooling. The specific legal requirements can vary by location, but if a garage is converted into a finished room meeting these criteria, it may be counted toward the total square footage.

If your garage door seems to freeze every winter, you can try rubbing silicone spray or petroleum jelly around the edges and rollers of the garage door. However, it’s a good idea to avoid direct application of silicone sprays like WD40 to rubber edges, which could damage them over time. A garage door that frequently freezes shut could need a full replacement, especially if it’s showing signs of rust or other wear and tear.

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.