Key takeaways
- Approval is generally needed for a deck over 600mm above natural ground level
- A deck within 3 metres of a boundary often needs approval (the setback varies by council)
- Heritage-listed dwellings and Heritage Conservation Zones can require approval regardless of height
- A ground-level deck under 600mm on a non-heritage block is often exempt - but confirm with your council
How deck approval works in South Australia
In South Australia, deck approvals are processed through the Planning, Development and Infrastructure Act 2016, the PDI Act, via the state e-Planning portal. The PDI Act is the system that decides whether your deck needs development approval and, if it does, assesses it.
Whether a deck needs approval comes down to a handful of thresholds. Sit under all of them and the deck is often classified as exempt development, meaning no approval is required. Cross any one of them and approval is generally needed.
The thresholds that trigger approval
Most metro Adelaide councils require development approval for a deck in any of these situations. The deck is more than 600 millimetres above natural ground level - this is the threshold that catches most raised decks. The deck is within 3 metres of a property boundary, though the exact setback varies by council. The deck is attached to a heritage-listed dwelling, or sits within a Heritage Conservation Zone. Or the deck forms part of a required pool fence.
Pool decks deserve a particular note: any deck within 1.2 metres of a pool interacts with the Swimming Pools Act and pool-barrier requirements, so a pool-surround deck almost always needs both development approval and pool-safety compliance.
When a deck is exempt - and the homeowner's responsibility
A deck at ground level - under 600 millimetres above natural ground - on a non-heritage property and at least 3 metres from any boundary is often classified as exempt development. No development approval is required for an exempt deck.
But exempt does not mean unregulated, and it does not remove the homeowner's responsibility. You remain responsible for confirming the deck genuinely qualifies as exempt with your own council before starting work. Councils apply their own overlays - heritage, character, hills-face - and a deck you assume is exempt may not be. The City of Adelaide is the clearest example: its CBD and North Adelaide Heritage Conservation Zones require approval for a deck regardless of height.
Why approval matters even when it feels like a hurdle
It is tempting to treat council approval as red tape, especially on a deck close to the exemption thresholds. It is not. A deck built without required approval is unapproved building work, and that surfaces at the worst time - a pre-sale inspection. An unapproved deck can hold up a sale, require retrospective approval, or in the worst case need modification or removal.
Getting the approval pathway right at the start is far cheaper than fixing it later. A BWC-licensed builder who knows your council will confirm whether your deck needs approval and, if it does, prepare the documentation. Decking Adelaide connects you with 3 such builders. See also our guide on BWC licensing in South Australia, which covers who is legally allowed to build the deck.
Deck Permits (SA) - frequently asked questions
Generally yes if the deck is more than 600 millimetres above natural ground level, within 3 metres of a boundary, on a heritage-listed dwelling, or part of a required pool fence. A ground-level deck under 600 millimetres on a non-heritage block, 3 metres or more from any boundary, is often exempt. You must confirm with your own council before starting.
Most metro Adelaide councils set the threshold at 600 millimetres above natural ground level - a deck under that height, on a non-heritage block and at least 3 metres from a boundary, is often exempt from development approval. A deck over 600 millimetres generally needs approval. Heritage zones can require approval regardless of height.
Often not. A deck under 600 millimetres above natural ground level, on a non-heritage property and at least 3 metres from any boundary, is frequently classified as exempt development. But the City of Adelaide's CBD and North Adelaide heritage zones require approval regardless of height, and other councils apply overlays. Confirm with your own council before starting.
It becomes unapproved building work, which typically surfaces at a pre-sale inspection. An unapproved deck can hold up a property sale, require retrospective approval, or in the worst case need modification or removal. Getting the approval right at the start is far cheaper than fixing it later. A builder who knows your council confirms the pathway.
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