Do you need a permit for a deck? The rules by state

Whether you need a deck building permit depends on your state and on the deck itself: how high the floor sits above the ground, how big it is and whether it carries a roof. A low, open deck escapes approval in most states. The height where that stops is 1 m in NSW, Queensland, Tasmania and the ACT¹, 500 mm in South Australia¹⁶ and 400 mm in the Northern Territory²⁴. Victoria wants a building permit for any deck attached to the house whatever its size, and Western Australia's building regulations have no deck item at all. On top of the state rule, each council adds its own triggers through overlays for heritage, bushfire and flooding.

Do you need a permit for a deck in Australia?

Most states run two separate approvals, and a deck can need one, both or neither. Planning approval is the council's call on where the deck sits and how it affects the neighbours. Building approval is the technical check that the structure will stand up. In most states a private certifier or building surveyor issues the building approval rather than the council. The names change at every border. NSW calls the no-approval path exempt development, Queensland calls it accepted development, Victoria splits a building permit from a planning permit and Tasmania sorts work into categories. The question underneath is the same everywhere. Is the deck low enough, small enough and open enough to skip the paperwork?

One rule is national. The National Construction Code asks for a barrier wherever someone could fall 1 m or more from a floor¹. Most state limits sit on the same 1 m line¹. Above it the deck needs a balustrade, and the state wants someone qualified to check the design. Deck balustrades and railings covers what the barrier itself has to do.

A permit is about the structure under the boards, so choosing composite over hardwood doesn't change whether you need one.

What size deck needs council approval? The rules by state

The table gives the main no-approval path in each state for an open deck beside an existing house. Each row has conditions behind it, covered state by state below, and a council overlay can override the lot.

NSW: exempt development, complying development or a DA

In NSW a deck, with or without a roof, is exempt development if it has an area of no more than 25 m², its floor is no more than 1 m above existing ground, nothing on it rises above 3 m, and it sits at least 900 mm from each boundary². A second cap applies to the total. All the balconies, decks, patios and verandahs on the lot together can't exceed 15 per cent of the house's ground floor area, or 25 m² on a lot of 300 m² or less². The deck has to be behind the building line of the road frontage, and any roof can't overhang its edge by more than 600 mm². Exempt development is lost on a heritage item, in a foreshore area, and on bushfire prone land unless the deck is non-combustible when it is within 5 m of the house³.

Miss any of those and the next step is complying development under the Housing Code. A council or a registered certifier issues the complying development certificate, with its own setback and lot size tests³. Complying development is not available on BAL-40 or flame zone land, in a heritage conservation area, or over a registered easement³. After that comes a development application to the council.

NSW licensing runs on value steps. A licensed contractor is needed for residential building work above a low threshold, and cover under the state's home building compensation scheme above a higher one⁴. An owner-builder permit sits between them for work that needs consent or a complying development certificate, so an exempt deck never needs one. The regulator's consumer building guide has the current amounts.

Victoria: a building permit for every attached deck

Victoria is the strict one. The Building and Plumbing Commission's practice note says a building permit is required for decks and verandahs attached to a building such as a house, irrespective of size⁶. Detached decks that serve a building need one too. Schedule 3 of the Building Regulations has no deck item. Its exemptions cover an open pergola of no more than 20 m² and 3.6 m high, and a freestanding Class 10a building of no more than 10 m² and 3 m high⁵. A deck is neither. The permit comes from a private or council building surveyor, who also checks the siting rules for setbacks and overlooking, and asks the council for a report and consent where the design departs from them.

The planning permit is the easier half. Victoria's planning provisions exempt a deck to a dwelling with a finished floor level not more than 800 mm above ground level, and an open-sided pergola or verandah at the same floor height and no more than 3 m tall, unless the scheme says otherwise⁷. A heritage overlay says otherwise for a deck visible from the street or a public park, and a small lot in a residential zone can need a planning permit to extend the house. The council website is the place to check the overlays on your block.

Owner-builders in Victoria need a certificate of consent when the cost of the work passes the prescribed amount, and the commission issues only one certificate in five years for a different property⁸. Work above the contract threshold must be done under a major domestic building contract by a registered builder.

Queensland: accepted development up to 10 m² and 1 m

Queensland's Building Regulation 2021 lists a Class 10 structure as accepted development, with no building approval needed, when its plan area is no more than 10 m², its height is no more than 2.4 m and no side is longer than 5 m⁹. The same item excludes a deck that is roofed or higher than 1 m above its natural ground surface, and any work in Wind Region C, the tropical cyclone area⁹. So a Queensland deck with a plan area of 12 m² needs a certifier's approval even when it sits 300 mm off the ground⁹. The approval comes from a private building certifier or the council. Accepted development still has to meet the Building Code, and a certifier can call for engineering on a frame that looks light.

Planning approval is separate, and in Brisbane the traditional building character overlay is the usual trigger on a pre-1947 house. From 1 September 2026 the Queensland Housing Code sets the siting rules. It does not apply to structures under 1 m above ground, and a deck more than 1 m up within 2 m of a boundary needs a privacy screen at least 1.5 m above its floor¹⁰. Councils can keep their old provisions until 2029, so ask which code applies.

The QBCC licence threshold is low. Building work above a few thousand in value needs a licensed contractor¹¹, and an owner-builder permit is needed above a higher figure, with a course behind it. Since August 2025 a Queensland seller's disclosure statement has to list any unresolved show cause or enforcement notice, and owner-builder work from the last six years¹².

Western Australia: no deck exemption, two approvals

The WA building regulations say nothing about decks. Schedule 4 exempts a freestanding Class 10a building with a floor area not exceeding 10 m² and no more than 2.4 m in height, outside wind regions C and D, and an open pergola covering no more than 20 m²¹³. Anything attached to the house, or larger than that, needs a building permit from the local council's permit authority. Councils publish figures like 500 mm as a rule of thumb for when they will want engineering, and the regulation itself has no height step¹³. For a house or a Class 10 structure the owner can lodge the application without a certificate and let the council's building surveyor certify the design, or pay a private registered building surveyor for a certificate first.

WA exempts more on the planning side. The local planning scheme regulations exempt a patio, pergola, verandah or deck on a house lot where the R-Codes apply, the work meets the deemed-to-comply provisions and the place is not heritage protected¹⁴. The exemption falls away in a special control area and on bushfire prone land where the scheme requires approval¹⁴. A registered builder is needed only for work that needs a permit and reaches the value threshold, which is higher for Class 10 structures like decks and patios¹⁵.

South Australia: 500 mm and 900 mm from the boundary

South Australia takes a low deck out of the definition of development altogether. The regulations exclude a deck used with an existing dwelling where no part of the floor is more than 500 mm above the natural ground and no part is within 900 mm of a boundary¹⁶. That exclusion is lost in a bushfire prone area, in the Historic Area Overlay and on a heritage place¹⁶, and an open pergola with no part higher than 4 m, behind the primary street building line, is excluded in the same clause¹⁶.

Above 500 mm the deck needs development approval, which in SA means planning consent plus building consent¹⁷. The council assesses most of it. An accredited professional can grant the building consent, and the planning consent as well for a verandah or carport that meets the Planning and Design Code's deemed-to-satisfy criteria. A licensed building work contractor is needed for anyone carrying on business, at any value. An owner building their own home doesn't need a licence, and the minor work threshold only decides whether a written contract and indemnity insurance are required.

Tasmania: under 1 m is low risk work

Tasmania's Director of Building Control sorts work into categories. A deck without a roof is Category 1 low risk work, which an owner can do without a permit, where the deck floor is less than 1 m above the surface beneath¹⁸. A detached deck or platform under the same height is in the category too, as is a pergola of up to 36 m² and 3.5 m with no solid roof¹⁸. Low risk work is still bound by the standard limitations, which keep it out of hazard areas for bushfire, landslip and flood, and cap cut or fill at 500 mm within 1.5 m of a boundary¹⁸. Work in a service easement needs the authority's written consent.

At 1 m or higher, or with a roof, a residential deck becomes notifiable work¹⁸. That needs a designer, a licensed builder and a building surveyor's certificate before work starts, and the surveyor passes the paperwork to council²⁰. Work that needs a planning permit, and any owner-builder work that is not low risk, becomes permit work through the council. The planning scheme exempts an open deck only if it is not attached to a habitable building and its floor is less than 1 m above ground, so an attached deck can need a planning permit even where the building side is low risk¹⁹.

ACT: exempt from a DA is not exempt from building approval

Canberra splits the question in two. The Planning (Exempt Development) Regulation exempts an external deck from development approval if it has no roof, its floor is no more than 1 m above finished ground, and any part forward of the building line or within 1.5 m of a side or rear boundary is no more than 400 mm above datum ground²¹. Forward of the building line the deck can't have a balustrade, and behind it the balustrade can't be more than 1.2 m high²¹.

Building approval is a separate test under the Building (General) Regulation. An outdoor deck counts as a small open building, exempt from building approval, only if it has no walls and no unsupported span over 4 m, stands no more than 3 m high and keeps its floor within 1 m of the ground²². Outside that, the owner appoints a private building certifier even when no DA is needed²³. The ACT has no value threshold for licensing. An owner-builder licence needs the land in your name, a building approval already issued and no other owner-builder licence in the previous five years.

Northern Territory: 25 m² and 400 mm, in building control areas

The Territory's Building Note 114 lists deck structures that are free of both the building permit and occupancy certification. They have a floor area of no more than 25 m² and sit no more than 400 mm above ground level²⁴. They are open rather than enclosed, have no roof, and serve a residential building²⁴. The deck must be freestanding or leave the building it attaches to structurally untouched²⁴. Above that a building permit comes from a registered private building certifier rather than the council, and the deck needs occupancy certification when it is finished²⁵. Permits apply only inside the Territory's building control areas, which take in Darwin, Alice Springs and the other declared regions.

The building note doesn't lift the NT Planning Scheme. Its setbacks for ancillary structures still apply, and a development permit has to come before the building permit where one is needed²⁴. A verandah or Class 10 structure added after the house was built is not prescribed building work, so the residential contract and fidelity fund rules do not apply to it.

Do you need council approval for a pergola or a roof over the deck?

A roof changes the answer in most states. Queensland's accepted development item excludes a roofed deck outright⁹. Tasmania's low risk item is for decks without a roof, and shade cloth on a pergola is the limit¹⁸. The ACT and NT exemptions both rule out a roof. NSW allows a roof within the exempt standards as long as it stays under 3 m and within the overhang limit². Victoria wants a building permit for an attached deck or verandah with or without a roof⁶.

An open pergola is treated more kindly. Victoria, WA and Tasmania each have a pergola exemption with an area cap, and SA excludes one with no solid roof up to 4 m high¹⁶. The moment it gets a solid roof it is a verandah or a patio, and the deck rules apply. A pergola on a deck covers the posts and footings, and a covered deck covers what the roof does to the boards.

What else knocks a low deck out of the no-permit path?

• Heritage. Each state takes the exemption away on a heritage item or place, and most do the same in a heritage or character overlay. Victoria's heritage overlay catches a deck visible from a street or park.
• Bushfire. NSW wants a non-combustible deck within 5 m of the house on bushfire prone land³. SA removes its exclusion in a bushfire prone area and the WA planning exemption can fall away on bushfire prone land. Tasmania can lift low risk work in a hazard area up to notifiable work. Composite decking fire ratings and BAL covers what the board has to be.
• Boundaries. NSW and SA both ask for 900 mm¹⁶, the ACT drops its height limit within 1.5 m of a boundary²¹, and Victoria's siting rules want 1 m or a council consent⁵.
• Easements and sewers. Building over or close to a water authority's pipe or easement needs the authority's consent, separately from the council. The authority sets its own clearances.
• Flood and coastal overlays. A flood, inundation or coastal overlay adds its own conditions or brings back a permit, and the council's mapping shows which one sits on the lot.
• Strata. On common property the owners corporation or body corporate has to agree first.
• Pools. A deck that changes a pool barrier or sits inside the fenced area reopens the pool safety rules.

Can you build a deck without council approval, and what happens if you do?

You can build a deck without approval only where the state rule says none is needed, and the rule still expects the frame to meet the Building Code. Build one that needed a permit and the council or the regulator can issue a building notice or order. The order can require the deck to be made good or pulled down, and Tasmania's illegal work order gives the owner that choice in so many words²⁰. The maximum penalties are set in penalty units and differ from state to state.

The cost that bites later is at sale. An unapproved deck turns up in a building inspection. A NSW building information certificate only stops the council ordering it repaired or pulled down, it is not an approval, and Victorian owner-builders selling within six and a half years of finishing need a defects report and warranty cover for the work. Insurers can decline a claim for a structure that needed approval and never got it. Where a deck already exists without paperwork, each state has a route to regularise it, and a building surveyor or certifier is the person to ask.

Owner-builder or licensed builder?

NSW, Victoria, Queensland and WA put a value threshold on owner-building. Above it you need the state's owner-builder permit or approval, often with a course or a white card behind it. Tasmania goes by the category of work instead and the ACT ties its owner-builder licence to a building approval. An owner building on their own home in SA doesn't need a licence, and the Territory leaves a deck added to an existing house out of its owner-builder rules. The thresholds move with each regulation change, so take the figure from the regulator's page on the day. Below them a competent owner can build a low deck in most states. Above them, or wherever a permit is needed, a licensed or registered builder is the plain route, and how to check a builder's licence shows where to look them up.

What I'd do

Measure the finished floor height at the highest point of the ground fall before anything else, because that number decides the path in six of the eight jurisdictions. Then pull the overlays on your lot from the council's mapping tool and read them against the table above. A deck that fits the no-approval path still deserves a folder with the rule, the measurements and the frame design in it, because the next owner will want them. One that doesn't fit is a call to a private certifier or building surveyor before the council, since they issue the building approval in most states and can tell you in a minute whether a planning application is needed as well. The deck designer asks for your state and flags the council approval limits against the height and area you draw, so start there and take the concept plan to the certifier.