With proper ground prep and basic upkeep, decades. We're talking 20, 30 years or more. These buildings are constructed with the same approach Amish communities use for their own barns and homes, structures that are meant to stand for generations.
The biggest factor in longevity is what the building sits on. Keep it off bare dirt, make sure water drains away from it, and re-stain or touch up paint every few years if you've got a wood exterior. Do that, and your building will outlast most things on your property.



