Do I need council approval for this building?

1. The owners of a commercial property intend to construct a 20 square metre detached building to serve as a garage. The proposed building will be more than its own height away from the boundaries, it contains no potable
water supply, and no facilities for cooking or sanitation. The owners want to construct the building from the lightweight materials in accordance with the technical requirements of the Building Code as specified in B1/AS1.

2. A 28 square metre sleepout is constructed in the backyard of a residential dwelling. It is more than its own height away from all boundaries and the associated residential dwelling, and does not contain cooking or sanitary facilities, or a potable water supply. The design complies with the technical requirements of the Building Code for the lightweight material per B1/AS1. Subsequently, the construction is carried out in accordance with that design.

3. A 26 square metre detached single garage is constructed on a concrete slab of a property with a residential dwelling. It is more than its own height away from all boundaries and the associated residential dwelling, and does not contain cooking or sanitary facilities, or a potable water supply. Plans and specifications comply with the technical requirements of the Building Code for the lightweight timber material per B1/AS1. Subsequently, the work is carried out in accordance with that design.

Single-storey detached buildings exceeding 10, but not exceeding 30, square metres in floor area, constructed of lightweight material
1. Building work in connection with any detached building that—
(a). is not more than 1 storey (being a floor level of up to 1 metre above the supporting ground and a height of up to 3.5 metres above the floor level); and
(b). exceeds 10 square metres in floor area, but does not exceed 30 square metres; and
(c). is built using lightweight wall and roof materials, and in accordance with acceptable solution B1/AS1 for timber or steel buildings; and
(d). does not contain sanitary facilities or facilities for the storage of potable water; and
(e). does not include sleeping accommodation, unless the building is used in connection with a dwelling and does not contain any cooking facilities;
and
(f). if it includes sleeping accommodation, has smoke alarms installed.

2. (2) However, subclause (1) does not include building work in connection with a building that is closer than the measure of its own height to any residential building or to any legal boundary.