How tall can a detached garage or pole barn be in Orion Township?

The rule is relative: a detached accessory building in a residential district may not exceed the height of your house as built (Section 27.02.A.5). It also may never exceed the district's cap for the principal building, which is 30 feet in the single-family districts (Section 5.04; Section 6.04).

One exception: if the accessory building sits at least 150 feet behind the house, it may exceed the house's height, up to the district cap (Section 27.02.A.5). That mostly matters on the township's larger SF and SE parcels.

Farm structures are treated separately. A barn, silo, or similar farm building may reach 40 feet in the districts that permit agriculture (Section 5.02.J; Section 6.02.O).

If your house is a low ranch and you want a tall RV garage, the relative height rule is the obstacle, and relief runs through the Zoning Board of Appeals (Section 30.07). Confirm how the township measures height for your design with the Building Department before ordering trusses.