One of the biggest disadvantages of glass garage doors is that they are not the best at insulating your garage. In the summer, heat can enter through the glass, while in the winter, heat can escape through the glass, increasing your electricity and gas bills as you crank up your HVAC unit. You can help mitigate the poorer insulation by investing in insulated glass and insulating your garage.

This is a matter of personal preference. However, building a detached structure is generally considered better if you intend to rent out the new space. The advantage to going with an attached garage addition is that you may pay less for plumbing, HVAC, and other features because you can use the existing systems from your home to carry over piping and wires.

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.

On average, a garage door can last between 15 and 30 years. However, this lifespan is influenced by several factors, including the quality and material of the door, local climate conditions, and how frequently it is used and maintained.

Key factors affecting longevity include:

• Material: Wooden doors can last 20 to 30 years or more, while steel doors typically last 15 to 20 years. More robust options, like triple-layer steel, can last 25 to 30 years with proper care. The number of layers in a door also contributes to its durability, with each additional layer potentially adding five years to its life.

• Maintenance: Regular inspections, cleaning, and immediate repairs can significantly extend the life of your garage door.

• Usage and Climate: Doors in harsh climates or those used very frequently may wear out faster.

• Components: Individual parts have different lifespans. For example, automatic openers may fail sooner than the door itself without regular maintenance, and garage door springs typically need replacement every 7 to 12 years.

While the door panels are designed to last as long as the door, they should be replaced sooner if they become visibly damaged, impact the door's smooth operation, or create a security risk.