The walls of these homes are usually guaranteed up to 40 years, but a Quonset home's average life expectancy is around 80 years. For innovative would-be owners, the design freedom a Quonset hut offers is a big draw.

How Long Does a Metal Garage Last? A prefabricated metal garage kit can easily last 20 to 30 years. Some steel structures can last over 50 years with good care. That's one of many reasons why a metal garage is a smart investment.

If you are dedicated to taking care of your steel building, it can last for over 50 years. Unfortunately, it can last only ten years if you fail to undertake regular maintenance; not a significant investment.

Properly maintained steel buildings can last over 50-100 years. The durability and lifespan depend on the quality of materials used, weather conditions, regular maintenance, and preventative care.