Decks, Patios, Carports and Sheds: What Needs Approval
The rules that catch homeowners out on structures they assume are minor, and why an unapproved deck becomes a problem at resale.
The assumption that costs money later
Decks, patios, carports and sheds feel like minor additions, and a great many get built without approval on that basis. They are structures, they are assessable, and the consequences show up later.
The problem surfaces at sale. A buyer's solicitor searches the property, finds a structure with no approval, and the sale stalls until it is either approved retrospectively or removed. Retrospective approval is possible but more expensive and occasionally refused.
Decks
A deck generally requires building approval, and the thresholds relate to height above ground and whether it is attached to the house. A low deck sitting close to ground level may be exempt; anything at floor level on a sloping block certainly is not.
Balustrade requirements apply once a deck is above a certain height, covering height, gaps and the non-climbable zone. These are safety provisions and they are enforced.
Structurally, an attached deck loads the existing house, and the connection back into the building is where badly built decks fail. On an older Queenslander that connection has to go into sound framing, which is not always what is there.
Patios and roofed outdoor areas
A roofed structure attached to the house requires approval, and it also affects site cover, setbacks and sometimes the private open space calculation the planning scheme applies to your lot.
Where it is close to a boundary, fire separation requirements can apply. Where it extends the building footprint, overlays apply as they would on any addition.
Stormwater is the practical item people forget. A new roof area needs guttering and a connection to a legal discharge point, not a downpipe discharging onto the lawn against the neighbour's fence.
Carports, garages and sheds
These need approval and are also assessed against setbacks, site cover and, for anything at the front, the streetscape provisions — which matter considerably inside a character overlay.
A driveway to a new carport or garage needs a crossover approval from council for the section within the road reserve, and that is a separate approval with its own specifications.
Larger sheds may also need engineering for wind loading, and on a sloping block, footings designed for the ground rather than a standard slab.
Pools and the fencing that follows
Any pool capable of holding water above a shallow depth must be fenced to the Queensland standard, and the non-climbable zone catches people out — air conditioning units, planter boxes, retaining walls and pergola posts near the fence can render a compliant barrier non-compliant.
Pools must be registered, and a pool safety certificate is required when selling or leasing.
If you are planning any of these alongside a build, do them under the same approval and the same contract. It is cheaper, faster and it leaves you with a clean set of documents. Our pool guide covers the sequencing.
If it is already built without approval
Retrospective approval is often possible. It generally involves engaging a certifier, having the structure assessed against current requirements, and providing engineering where the original work was not documented.
The risk is that a structure built without approval was frequently built without engineering, and it may not meet current requirements. In that case the options are rectification or removal.
Deal with it before you list the property rather than during a sale, when the timeline is against you and the buyer has leverage. It is almost always cheaper and less stressful handled in advance.