Non-Climbable Zones — The Most-Missed Pool Fence Rule
If you take only one rule away from this whole series, take this one. The non-climbable zone is the rule we re-check more often than any other, and it's the rule that catches more pool owners out than the fence height, the gate latch, or anything else.
The good news is that NCZ breaches are usually easy to fix. You move the planter, you re-park the BBQ, you trim the tree. Most of the time it's a 15-minute job. And if you'd rather we just look at it and tell you what to move — that's what we do. We inspect the barrier, take care of minor repairs where needed, supply your Form 23 Certificate of Pool Barrier Compliance, and lodge it with your council for you. Simple and stress-free.
What we handle for you
- We inspect the pool or spa barrier
- We handle minor repairs and adjustments on the spot where possible
- We supply your Form 23 Certificate of Pool Barrier Compliance
- We lodge it directly with your council
What you handle
Answering the door.
What the non-climbable zone actually is
Under AS1926.1, your pool barrier must have a 900mm Non-Climbable Zone (NCZ) clear of climbable features:
- Outside the fence: a 900mm arc, measured from the top of the fence outwards and downwards. Nothing climbable can sit inside that arc.
- Inside the fence: a 900mm zone above ground level — again, nothing climbable.
The logic is simple: a child should not be able to use anything as a climbing aid to get over the top of the fence. The fence height (1,200mm) only protects them if there's nothing they can step on to clear it.
That's the rule. The reason it catches people out is that "climbable" is a wider category than most people think.
What counts as climbable
The list of climbable items in a typical Australian backyard:
- Planter boxes and pots. Even modest ones — a 400mm pot is enough.
- BBQs and outdoor kitchen units.
- Air-conditioning units and pool pump housings.
- Built-in seating, benches, daybeds.
- Kids' play equipment — sandpits, cubby houses, trampolines.
- Bins and bin enclosures near the fence line.
- Horizontal rails on fences — a major issue with traditional timber paling fences where the rails are on the outside. Each rail becomes a ladder rung.
- Tree branches that hang into or over the NCZ.
- Shed roofs, retaining walls, low sheds and lean-tos.
- Storage boxes and chests — particularly the deck-storage type that doubles as seating.
What doesn't count as climbable:
- Soft turf and lawn.
- Smooth, flat paving with nothing on it.
- Decorative loose pebbles that wouldn't support a foot.
The principle: if a determined two-year-old could step onto it, climb it, or use it as a leg-up — it's climbable.
The boundary fence problem
The single most common NCZ breach we see in Melbourne is the neighbour's side of a shared boundary fence.
If the boundary fence forms part of your pool barrier (very common in inner-suburb properties), the NCZ rules apply to both sides of that fence — including the neighbour's side. If your neighbour has a BBQ, a planter, a bin, a play structure, or horizontal fence rails on their side within 900mm of the fence, your pool fence is non-compliant.
This is the conversation no one wants to have with their neighbour. We can help. The standard approach is:
- Identify the climbable features during the inspection — we mark them on the fix-list with photos.
- Provide a clear, polite explanation for the neighbour (we can write one for you) referencing the standard.
- Offer practical alternatives — moving the item, replacing horizontal rails with a vertical face, or building an internal pool-side barrier independent of the boundary fence.
Most neighbours are reasonable once they understand it's a child-safety legal requirement, not a personal preference.
A fence that used to comply
The thing to remember about NCZ is that a fence compliant at install can become non-compliant later without anything changing on the fence itself.
You put a planter box next to the fence — the fence is now non-compliant. Your tree grows — the fence is now non-compliant. Your neighbour buys a new BBQ — the fence is now non-compliant. The garden builds up next to the fence — the fence is now non-compliant.
That's why the four-year re-certification cycle matters. A fence that passed in 2022 isn't necessarily going to pass in 2026 — and the difference is usually a single climbable item that arrived somewhere along the way.
How to self-check NCZ in 5 minutes
Walk the perimeter of your pool fence — both sides — and look for anything within 900mm of the fence (measured horizontally) that a small child could climb.
- Outside the fence. Walk slowly. Look at the ground level, then look upward toward the top of the fence. Is there a continuous "ladder" of climbable surfaces from the ground to within 900mm of the top? If yes — fail.
- Inside the fence. Same again, on the pool side.
- The neighbour's side. Check it. If your boundary fence is part of the pool barrier, it counts.
- Look for horizontal rails. Vertical pickets are fine. Horizontal anything is a problem.
Anything you can move — move it now. Anything you can't, note it for the inspector.
For the fence-height and gate rules that pair with NCZ, see Pool Fence Height Requirements in Victoria and Self-Closing Pool Gate Requirements (Victoria).
When NCZ needs more than just moving things
Sometimes the climbable feature can't be moved — it's a permanent retaining wall, a structural deck, a built-in BBQ, or a neighbour's fence design you can't change.
In those cases the fix is usually one of:
- Extending the fence height in that section so the NCZ envelope still clears 900mm above the climbable feature.
- Replacing horizontal rails with vertical members so the fence itself is no longer climbable.
- Building an internal pool-side barrier that's independent of the boundary fence — effectively shifting the compliance line.
We tell you which is the cheapest viable path during the inspection. For anything beyond a planter-shuffle, we coordinate the right trade on your behalf and re-inspect at no extra charge once the work is done.
Frequently asked questions
What is the non-climbable zone in a Victorian pool fence? A 900mm clear zone — measured from the top of the fence outwards and downwards on the outside, and 900mm above ground level on the inside — that must contain no climbable features.
Does the NCZ apply to my neighbour's side of the fence? Yes, if the boundary fence forms part of the pool barrier. The 900mm rule applies to both sides.
Are pot plants a problem near a pool fence? Often, yes. A pot taller than ~300mm within 900mm of the fence is usually a climbable hazard.
Are horizontal fence rails always a problem? On the outside of the fence, yes — each rail becomes a step. Vertical pickets are fine.
Will my tree growing over the fence cause a fail? Yes — overhanging branches that a child could grab and climb count as climbable features.
How often should I re-check my NCZ? Quick walk-around twice a year is sensible — and any time you add furniture, plants or equipment to the backyard.
Ready to get it sorted?
- Not sure if you've got an NCZ problem? Book a $99 + GST FaceTime consultation — we'll spot it in 30 minutes.
- Want a full inspection? Book the $299 + GST full inspection and Form 23 lodgement.
- Just the gate is the issue? $199 + GST gate service — usually done in 60 minutes.
Or call 0438 383 752. Either way, the inspection, the certificate, the council lodgement, and everything in between is on us. Simple and stress-free.
Related guides
- Pool Fence Regulations Victoria: The Complete Guide — the cornerstone.
- Pool Fence Height Requirements in Victoria.
- Self-Closing Pool Gate Requirements (Victoria).
- Pool Inspections in Melbourne: What's Involved and What to Expect.