Inflatable Spa Pool Fence Rules: The 300mm Test by State

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Yes, in most of Australia. An inflatable spa that can hold more than 300mm of water is legally a swimming pool in NSW, Queensland, Victoria and WA, and a typical 4-person inflatable is about 480mm deep when full. My inflatable spa needs a fence in QLD, VIC and WA even with a lockable cover; only NSW accepts a lockable lid.

The short answer

The trigger is 300mm of water, not the price or the material. NSW and WA say more than 300mm; QBCC says 300mm or more; Victoria’s councils say greater than 30cm. Inflatables are named in all four.
A typical inflatable spa is about 480mm deep. One maker’s 4-person tub holds 795 litres in a 1.45m inside diameter, so it crosses 300mm at about 494 litres, 62% full.
Only NSW accepts a lid instead of a fence. Clause 9 requires a lockable child-resistant structure of substantial construction; whether a soft inflatable cover meets that is for your council or certifier to decide.
Registration applies to portable spas too. NSW requires every spa on the Swimming Pool Register; Victoria requires registration once a relocatable spa is up for 3 consecutive days; Queensland requires QBCC registration.
NSW exempt development stops at 2,000 litres. A portable spa needs no approval only if it is in the rear yard, at least 1m from every boundary and needs no structural work.

Inflatable or portable spa: what each state requires once it can hold more than 300mm of water (read at the regulator, 2 October 2026)
State	Depth trigger	Lockable lid instead of a fence?	Approval for a portable spa	Registration
NSW	Greater than 300mm (Swimming Pools Act s 3, spa pool included)	Yes, if covered and secured by a lockable child-resistant structure of substantial construction (Act s 20, Reg cl 9); not for swim spas	Exempt if 2,000L or less, rear yard, 1m from every boundary, no structural work (Codes SEPP cl 2.60); otherwise CDC or DA	Every pool and spa on the NSW Swimming Pool Register (Act s 30B)
Queensland	300mm or more; QBCC names blow-up pools and spas	No. City of Gold Coast: must meet the standard ‘even if it has a lockable lid or cover’	Building approval; Gold Coast exempts only wading pools under 300mm, under 2,000L and with no filtration	QBCC pool safety register
Victoria	Greater than 30cm, relocatable and inflatable included (council guidance)	No (City of Ballarat: ‘a lockable lid is not a safety barrier’)	Building permit for the barrier unless a Schedule 3 exemption applies; ask a building surveyor	With council if erected for 3 or more consecutive days, by the 4th day
Western Australia	More than 30cm, spa pools and portable pools included	No. A cover, even a lockable one, is not a barrier	All pools and spas need building approval	Local government inspects new barriers within 30 days of learning they are complete

Does my inflatable spa count as a swimming pool?

Almost certainly, and the test is a ruler, not a label. Each state defines a pool by how deep it can be filled:

NSW: section 3 of the Swimming Pools Act 1992 defines a swimming pool as a structure or vessel capable of being filled to a depth greater than 300mm and used for ‘swimming, wading, paddling or any other human aquatic activity’, and it expressly includes a spa pool. NSW Fair Trading adds that this applies to ‘portable and inflatable pool owners’.
Queensland: the QBCC applies the law to anything capable of holding 300mm or more, and says this ‘applies to wading pools (including blow-up pools) and spas’.
Western Australia: Building and Energy says private pools ‘including spa pools and portable pools’ with water more than 30cm deep must have a barrier.
Victoria: council guidance (Bayside City Council) covers relocatable pools and spas capable of holding more than 30cm.

The 300mm fill test (worked). One major inflatable spa maker publishes its 4-person tub at 66cm high, 57 inches (1.45m) inside diameter and 210 US gallons (795 litres). Floor area is π × 0.724² = 1.65 m². Full depth is 795 ÷ 1,650 = about 0.48m (480mm). The 300mm line is 1.65 × 0.3 = 494 litres, or 62% of capacity. Do the same sum with your own tub: litres ÷ inside floor area in m² ÷ 1,000 = depth in metres.

The quotable version: a 4-person inflatable spa crosses Australia’s 300mm pool threshold at about 494 litres, well short of its 795-litre capacity.

Filling it only partly does not get you out of the rule: NSW, Queensland and WA test what the spa is capable of holding. For hard-shell spas the same rules apply, and what a spa costs to install prices the fence or lid that results.

Can a lockable spa cover replace the pool fence?

Only in NSW. Section 20 of the Swimming Pools Act exempts a spa pool from the barrier ‘so long as access to the water … is restricted … at all times when the spa pool is not in actual use’. Clause 9 of the Swimming Pools Regulation 2018 sets the standard: the spa must be covered and secured by a lockable child-resistant structure (such as a door, lid, grille or mesh) that is of substantial construction, with no opening a testing apparatus can pass through, fastened by a device that is itself of substantial construction.

That wording is the problem for inflatables. Most come with a soft insulated cover held by clips. Neither the Act nor the Regulation says whether that is ‘substantial construction’; it is a judgement for the council or certifier who inspects it. If yours fails, the fallback is a compliant fence. Swim spas do not get the lid exemption at all: see swim spa vs pool.

Everywhere else the answer is a flat no. The City of Gold Coast says a spa or ice bath able to hold more than 300mm ‘must meet the Queensland Pool Safety Standard, even if it has a lockable lid or cover’. WA Building and Energy and Victorian councils say the same. Queensland does let the spa’s own walls count as part of the barrier if they are at least 1200mm high and cannot be climbed, but steps or a ladder must then sit inside a compliant fence with a self-closing gate. An inflatable spa is about 660mm high, so that route rarely works.

The quotable version: in NSW a spa can be made legal with a lockable lid of substantial construction; in Queensland, Victoria and WA an inflatable spa needs the same fence as a pool.

Fence specifications are on pool fence rules by state and the non-climbable zone, explained.

Do I need approval or registration for a portable spa?

NSW. A portable spa is exempt development, needing no approval, under clause 2.60 of the Codes SEPP only if it is for residential use, in the rear yard, at least 1m from each lot boundary, no more than 2,000 litres, needs no structural work and does not affect any building’s stability. It cannot be on a heritage item or in a foreshore area. The barrier must still comply with the Swimming Pools Act. Separately, section 30B of the Act requires the owner to register every pool, spa included, on the NSW Swimming Pool Register; the maximum penalty is 20 penalty units.

Victoria. Bayside City Council says relocatable pools and spas ‘must be registered if they are erected for 3 or more consecutive days’, on the 4th day after erection; under 3 days, no registration. Registration brings the barrier certificate cycle; see Victorian pool registration and barrier compliance.

Queensland. The City of Gold Coast says all pools and spas need building approval and QBCC registration, exempting only portable wading pools that cannot be filled to 300mm, hold under 2,000 litres and have no pump and filter attached. An inflatable spa has a pump and fails the first test.

Western Australia. Building and Energy states that all swimming pools and spas need building approval, and that the local government must inspect a new barrier within 30 days of becoming aware it is complete.

For the same questions on a portable pool rather than a spa, see building permits for above-ground pools. Fees by state are on pool permit and registration fees.

What it costs to make an inflatable spa legal

Work it out before you buy the spa, because the barrier can cost more than the tub. Our spa installation cost breakdown uses vendor-published prices of $250–$350 a metre installed for aluminium pool fencing and $650–$975 for a lockable hard cover. A 2.5m × 2.5m fenced enclosure around a 2m tub is 10 metres of fence, or $2,500–$3,500 before the gate, at those rates.

Three cheaper routes are lawful. Put the spa inside an existing certified pool barrier, which the City of Gold Coast expressly allows if that barrier fully complies. In Victoria, keep it up for under 3 consecutive days at a time, which avoids registration but not the barrier. Or drain it below 300mm and store it when not in use. A spa that is drained and packed away is not capable of holding water in that state.

The quotable version: put an inflatable spa inside the pool fence you already have, and the cost of making it legal can be zero.

If you are weighing a permanent spa or plunge pool instead, compare pool quotes with the barrier priced in, so every quote covers the same scope.

Common questions

Do you need a pool fence for an inflatable spa?

In Queensland, Victoria and WA, yes, if it can hold more than about 300mm of water, which almost every inflatable spa can. In NSW a lockable child-resistant lid of substantial construction can replace the fence under clause 9 of the Swimming Pools Regulation 2018.

Do you need a pool fence for a spa in QLD?

Yes. The City of Gold Coast says any spa or ice bath able to hold more than 300mm must meet the Queensland Pool Safety Standard even with a lockable lid. The spa walls can be part of the barrier if they are at least 1200mm high and non-climbable.

Do you need a pool fence for a hot tub?

A hot tub is a spa pool in law. The same depth test applies: NSW allows a compliant lockable lid; Queensland, Victoria and Western Australia require a barrier.

Does an inflatable spa have to be registered in NSW?

Yes. Section 30B of the Swimming Pools Act 1992 requires the owner to put every swimming pool, including a spa pool, on the NSW Swimming Pool Register. NSW Fair Trading says this applies to portable pools too.

Is a portable spa exempt from council approval in NSW?

It can be. Under clause 2.60 of the Codes SEPP it is exempt development if it holds 2,000 litres or less, sits in the rear yard at least 1m from every boundary, and needs no structural work.

Sources

General information only, current at 2026-10-02. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.

Do I need a pool fence for an inflatable spa?