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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.

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.

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.

Insulating a detached garage won't reduce your home's heating or cooling bills—and insulating an attached garage will only have a small effect on your home's energy efficiency. However, insulating an attached garage can reduce the transfer of heating and cooling to and from the outdoors, which can reduce the amount of energy your home needs to stay comfortable. Also, having an insulated garage is just more pleasant. Balance the cost of insulating your garage with how you'll use the space to determine if the project is worth it.