How big can a mini-barn (or other detached accessory structure) be before I need permits?
If the structure is 120sf or less, less than 15′ tall, without permanent utilities, and not attached to a permanent foundation, no permits are required. If the structure is more than 120sf, or it the structure is less than 120sf and connected with utilities, a permanent foundation is required. If a permanent foundation is required, or if a permanent foundation will exist for a structure that is less than 120sf, a full set of permits will be required.