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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.

You can put sliding doors on your garage, but it’ll save you money if you install them when you’re building the garage, so you avoid removal costs for the old door. Garage doors are sectional, using vertical tracks and large springs to lift the door. These require professional removal, and the cost can quickly add up to thousands of dollars. 

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.

The lifespan of garage door springs depends on the type and quality of the springs, the physical environment, and the level of use. In general, properly installed and maintained springs open and close a garage door around 10,000 times . That equates to around seven years if you open and close the door about four times a day. If you use your garage door more frequently, live in a very cold or humid environment that promotes corrosion or rust, or have a very heavy door, your springs may wear out faster and require replacing sooner.