Building a BCA class 10a shed, garage or carport near a boundary? We explain the requirements to ensure compliance with the National Construction Code (NCC) and ABCB Housing Provisions. Let's break it down below. A garage, carport or shed is a Class 10a building under the National Construction Code (NCC). Many of the Code's rules for houses do not reach it, and the fire rules that do are mostly about protecting the house beside it. Put a garage within 900 mm of a side fence,