Brisbane is a city of detached houses on tight lots, character streets and flood-mapped suburbs, and every garage or shed has to fit all three.
Building a shed in Brisbane
About 71% of occupied dwellings in the Brisbane urban centre were separate houses in 2021. On those lots the boundary rules decide the design: Brisbane's small-lot code applies under 450 m², and in character areas the amenity and aesthetics referral can apply to Class 10 buildings.
Flooding is property-specific. The 1974 flood reached 5.45 m on the City gauge, the 2011 flood 4.46 m, and in February 2022 flash flooding hit the northern suburbs with a record 344.8 mm in a day at Alderley. Council's FloodWise Property Report is the document to pull before a slab level is set.
Brisbane averages over 1,000 mm of rain a year, so gutters, downpipes and where the stormwater goes are part of a garage design, not extras.