Exempt development in NSW: what you can build without any approval

The limits, structure by structure

The headline numbers below are for standard residential zones. Rural zones RU1 to RU4, RU6 and R5 large-lot residential get larger allowances and larger setbacks almost everywhere, so the first question is always which zone you are in.

If a project misses one of these standards it usually lands in complying development territory rather than being refused outright. CDC vs DA sets out those two pathways, and the shed and carport guides cover those two structures across every state.

What voids the exemption before you measure anything

Every limit above has a second test behind it. These land conditions are written into the Codes SEPP itself, and any one of them can change the answer before a dimension matters.

1. A State Heritage Register item blocks everything. If your land is, or contains, an item on the State Heritage Register, or is under an interim heritage order, there is no exempt development of any kind.
2. A locally listed heritage item removes it too. The exempt provisions exclude work on land that is, or contains, a heritage item or draft heritage item identified in your council's LEP. If your house is a listed item, a shed, carport, deck or tank needs approval.
3. A heritage conservation area restricts rather than voids. In a conservation area the rule differs by structure type. A freestanding deck, pergola or shed has to sit behind the rear building line, match the house's side setback and stay at or under 20m², and is not exempt at all on a lot with a lane or a second road frontage. A structure attached to the house has to sit behind the building line of any road frontage.
4. Environmentally sensitive and foreshore areas are written per structure. These do not stop every structure. A shed or driveway is excluded from both foreshore and environmentally sensitive land, but the exclusion list is written clause by clause: some name foreshore, some name environmentally sensitive land, some name both. Read the clause for the structure you are actually building.
5. Flood-affected land turns on a defined term. A flood control lot can remove exempt development, and that exclusion sits in the Codes SEPP itself. Your council's LEP flood mapping can remove further structures on top of it. Flood control lot is a specific defined term rather than any flood notation, so if your block carries a flood marking, check which kind it is before assuming anything.
6. Bushfire-prone land conditions the exemption rather than voiding it. On a bushfire-prone lot, most structures within 5m of a dwelling have to be built from non-combustible material, on top of the standard size and setback limits. The exemption still stands, it is just stricter.
7. Zone matters more than people expect. The same shed that is exempt at 50m² on a rural block drops to 20m² on a suburban block, and the boundary setback moves from 900mm to 5m. Before you measure anything, know which zone you are in.

Two of these have guides of their own: heritage overlays and flood overlays, and the overlay entry defines the term itself.

The three traps that most often cost people their exemption

New South Wales is the one state where getting this right saves you the whole approval process: a shed or carport that meets every exempt standard clears planning and building approval in a single step. Three failures account for most of the exemptions that get lost, and each one is written into the instrument rather than being a matter of interpretation.

1. The item versus area trap. Owners hear heritage and assume nothing is allowed, or hear conservation area and assume anything goes. Both readings are wrong, and the instrument treats them very differently. A listed heritage item means exempt development does not apply to the block at all. A conservation area mostly pushes structures into the rear yard. Which one applies to you changes the entire answer.
2. The all-or-nothing trap. A carport 200mm too close to the building line, a shed one square metre oversized, an air-conditioning unit slightly too close to a neighbour's bedroom window: any one of these removes exempt status on its own. The standards are cumulative, so size, height, setback and location all have to pass together.
3. The carport that turns into a garage. A carport has to stay genuinely open. Enclosing it on a second side, or across more than a third of its perimeter, can reclassify it as a garage, and the carport exemption stops applying. Boxing in an existing carport is a common way a project moves from exempt to needing approval.

Already built it without approval?

There is no retrospective approval for unauthorised work in NSW. If council takes an interest, the path runs through an order to repair, alter or demolish.

The defensive instrument available to an owner is a Building Information Certificate: a council statement that it will not act against the building as it stands. A BIC is protection rather than permission, and it has limits.

If you are buying a property with a suspiciously approval-free shed or deck, this is a due-diligence question to ask before settlement, not after.

Exempt, complying or a DA: thirty seconds

• Exempt: meets every standard, so no approval at all.
• Complying development (CDC): bigger works that still meet prescribed standards, certified by a council or a private certifier, with no merit assessment.
• DA: everything else, assessed on merit against the local plan, with neighbours notified.

Frequently asked questions