The same setbacks for your house are applicable for a deck. The setbacks as per a house are height-dependent, lot size- and street boundary-dependant. 

Generally on a 450m² + block, a roofed deck on the first floor level is required to be 2.0m from the Outer Most Projection (OMP). The OMP is usually the eave, as it is the closest point to the boundary. If you have a block smaller than  450m², it falls within the rules of Brisbane City Council’s Small Lot Code, which provides a sliding scale, the smaller and narrower the lot, the closer you can build to the boundary.

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