Are Jumping Castles Safe? An Honest Answer From a Perth Operator
If you have a party booked and you are now wondering whether to cancel, here is the honest answer from someone who does this for a living and is a mechanical engineer by trade. The castle is almost never the problem. Wind is.
What actually goes wrong
Australia has a proper standard for this. It is AS 3533.4.1:2018, and it covers land-borne inflatable devices, which is the technical name for a jumping castle. Two things in that standard matter more than everything else in it combined.
Anchoring
Every castle has a set number of anchor points and a minimum pegging or ballast requirement from the manufacturer. Skip a few pegs because the ground is hard, or use sandbags that are lighter than they should be, and you have not cut a corner — you have built a kite. Anchoring is the difference between an inflatable that stays where you put it and one that does not, and it is invisible to the customer unless they know to look.
Wind
WorkSafe WA is clear on this. An inflatable should be evacuated when wind gusts go over the manufacturer’s limit, or over 40km/h if the manufacturer has not set one. They also recommend operators actually measure it with an anemometer rather than guess.
“Operators should utilise an anemometer to measure wind speed where possible.”
Forty km/h is not a storm. It is a gusty spring afternoon in Perth. That is the whole point. The conditions that lift a castle are not dramatic weather — they are a normal windy day plus anchoring that was never good enough to begin with. Perth families know the Fremantle Doctor arrives most afternoons through summer at 30 to 40km/h, which is exactly why we anchor the way we do. There is more on that in our sea breeze anchoring guide.
One more thing worth knowing
In WA, a continuously blown inflatable only needs plant and design registration with WorkSafe if the platform height is 3 metres or more. Most backyard party castles sit well under that. Which means there is no registration, no mandatory inspection, and nobody checking the operator’s work.
The responsibility sits entirely with the hire company. That is not a scandal, it is just how the regulations are drawn. But it does mean the difference between a safe hire and a dangerous one comes down to whether the person setting it up knows the standard and follows it on the days when it would be easier not to. Nobody is coming to check.
What we do at Kanga Kingdom
- We peg to the manufacturer specificationAll anchor points, every time. No exceptions for hard ground, a tight setup or a hurry.
- We use a proper ballast arrangement on hard surfacesWhere stakes will not go in, the anchoring is replaced with a rated ballast setup, never improvised.
- We pull test the anchors before handoverThe castle is not yours until the anchoring has been tested with the blower running.
- We check the forecast before we leave, and gusts on siteA regional forecast and what your backyard is actually doing are two different numbers.
- Over the limit, we do not set upIf wind comes up mid party, everyone comes off and it is deflated. We would rather have an awkward conversation than a hospital visit.
- Every castle is inspected before and after each hireSeams, anchor points, blower and cabling, checked both ways, and written down.
New: we leave a wind meter with you
WorkSafe WA recommends operators measure wind with an anemometer instead of estimating it. We agree, so we have gone a step further. Every Kanga Kingdom hire now comes with an anemometer — a handheld wind meter — left with you for the duration of the booking.
At setup we show you how to hold it, how to read a gust, and the exact number at which the castle needs to stop. Then it stays with you. Because here is the honest problem with the industry-standard promise of “we watch the weather”: we are not at your party. We check the forecast before we leave and we measure gusts on site before handover, but the wind at three in the afternoon in your backyard is something only you can see.
We would rather you had the instrument in your hand than take our word for it. If the meter reads over 40km/h, everyone comes off and the castle gets deflated. Call us and we will talk you through it, or come back and pack it down. No argument, and no charge for shutting it down early.
Five questions to ask any hire company
You do not need to know the standard to work out whether someone is doing this properly. Ask them these five. A good operator will answer all of them without hesitating — and if someone gets vague on the wind question, that is your answer.
How many anchor points does this jumping castle have, and will you use all of them?
Every inflatable has a set number of anchor points specified by its manufacturer, and the number is not a suggestion. Ask for the figure, and ask whether every point gets used on your setup. At Kanga Kingdom we peg to the manufacturer specification every time, with no exceptions for hard ground or a tight backyard. If an operator cannot tell you the number, they are not working to the specification.
What is your wind limit, and how do you measure it?
WorkSafe WA is clear on this: an inflatable should be evacuated when wind gusts exceed the manufacturer limit, or exceed 40km/h where the manufacturer has not set one. WorkSafe also recommends operators measure wind with an anemometer rather than estimate it. Our limit is 40km/h, we measure gusts on site before handover, and we leave an anemometer with you for the hire so you can check it yourself.
What is your policy if the wind picks up during the party?
The answer you want is that everybody comes off and the castle is deflated, not that someone will keep an eye on it. A deflated inflatable on the ground cannot lift. We brief you on this at setup, give you the wind meter and the number to watch for, and we would far rather you shut it down early and called us than waited to see what happened.
What happens if you are setting up on paving or another hard surface?
Stakes cannot go into paving, limestone or concrete, so the anchoring has to be replaced with a ballast arrangement rated for the job, not improvised with whatever is in the van. Tell your operator about the surface when you book, not on the day. We use a proper ballast arrangement on hard surfaces and we pull test the anchors before we hand the castle over.
Can I see your public liability certificate?
Any professional operator will send it without hesitating. We carry $20 million public liability cover and email the certificate on request, and it is also what most Perth councils require if you are putting a castle in a park. An operator who is vague about insurance is telling you something.
So should you cancel?
No. A properly anchored castle, operated by someone who watches the weather and is not afraid to shut it down, is a safe bit of fun. Kids have been bouncing on these things for decades, and set up properly an inflatable is one of the safest high-energy things you can put in a backyard.
But this is not an industry where a licence gets checked at the gate. For most castles, nobody is coming to inspect. So ask the questions. Any operator worth booking will be glad you did.
Book a castle that arrives anchored, insured and briefed
$20 million public liability, anchoring to the manufacturer specification, a wind meter left with you, and a free reschedule if the weather turns.
More reading: hire FAQs, the parents’ safety guide, and anchoring against the Fremantle Doctor.