Non-Climbable Zone (NCZ) Victoria: The 900mm Rule Pool Owners Get Wrong

The Non-Climbable Zone — usually shortened to NCZ — is the rule that catches more Greater Geelong pool owners than fence height, latch height, and gate self-close combined. It’s a 900 mm clear zone on the pool side of the barrier, plus a 300 mm clear zone above the top, where nothing can be present that gives a child a way to climb. And the list of “things that count as climbable” is longer than most homeowners realise.

This guide explains exactly what AS 1926.1-2012 requires, what counts as a NCZ breach, and where the most common failures hide on Geelong, Bellarine, Moorabool and Wyndham properties.

What AS 1926.1-2012 Actually Requires

Australian Standard AS 1926.1-2012 — referenced by the Building Regulations 2018 (Vic) as the operative pool safety standard — defines two NCZs:

The 900 mm horizontal NCZ

Measured from the inside (pool-side) face of the barrier, extending 900 mm outward into the pool zone. Within this 900 mm, the ground level and all fixtures must be clear of climbable objects. The purpose is to prevent a young child from using something inside the pool zone to climb out — even though they’re inside the barrier already.

The 300 mm vertical NCZ

Measured from the top of the barrier upward 300 mm. This zone must be clear of any tree branches, structures, or objects that overhang the barrier and could provide a foothold from outside. The purpose is to prevent a child from outside using an overhanging feature to vault the barrier.

What Counts as Climbable

This is where most homeowners trip up. The standard isn’t “anything taller than 600 mm” — it’s anything that could give a child a foothold or handhold. Specifically:

• Plants and shrubs — anything woody or stiff enough to bear weight. Soft annuals don’t count; established roses, hedges, palms, and tree trunks do.
• Pool pumps and filter equipment — even small pumps are typically 300–500 mm tall.
• Storage crates, pool toy boxes, towel storage — anything stable enough to stand on.
• Built-in seating, planter walls, retaining walls — even decorative ones.
• Steps, decking transitions, raised garden beds — anything creating a higher surface within 900 mm of the barrier.
• Horizontal rails on the inside of the fence — your fence has horizontal rails facing the pool? Each one is a ladder rung.
• Ladders, hose reels, BBQ trolleys — anything portable that could be moved into the NCZ. Inspectors flag these on the day.
• Pool covers and reels mounted near the barrier — the reel itself is climbable.

Where Geelong-Area Inspectors Find NCZ Failures Most Often

1. Established gardens against the fence (older inland Geelong)

Newtown, Highton, Belmont, Grovedale homes from the 1970s–1990s typically have mature plantings — camellias, photinia hedges, palms — placed close to the pool fence. When the pool was first certified, the plants were small. 30 years later, they’re climbable structures inside the NCZ. Remediation usually means removing or relocating the planting; trimming alone doesn’t help if the trunk and main branches sit within 900 mm.

2. Pool equipment kept inside the enclosure

Most homeowners keep the pump, filter, chlorinator, and pool storage inside the pool fence — out of sight from the street. If any of this equipment sits within 900 mm of the barrier, it’s a NCZ failure. Common fix: relocate the equipment to a far corner, or build a small fenced-off plant room outside the main barrier.

3. Retaining walls and garden borders (sloped sites)

On sloped Geelong properties, retaining walls inside the pool zone are common. Anything 600 mm or higher within 900 mm of the fence is a fail. We see this regularly in Wandana Heights, Highton, and Newtown.

4. Decking transitions and raised seating

Modern pool renovations often include built-in seating along the fence line, or a raised deck section adjacent to the barrier. If the seat or deck top is within 900 mm of the fence and itself raised more than 100 mm above the surrounding ground, it’s a NCZ fail.

5. Horizontal rails on the pool side of older fencing

Older steel-tube fencing often has horizontal rails on the inside (pool side) of the panels. Each rail is effectively a ladder rung within the NCZ. The remediation is either replacing the panels or capping the rails with a non-climbable cover — and capping rarely passes inspection because the cap itself adds another foothold.

The 300 mm Vertical NCZ — Often Overlooked

The 300 mm zone above the barrier top catches:

• Tree branches overhanging the fence from outside the pool zone — even if the trunk is well outside, low branches inside the 300 mm zone are climbable.
• Pergola or carport rafters that pass over the fence — the rafter end inside the 300 mm zone is a problem.
• Power lines, irrigation pipes, anything mounted near the top of the fence.

This zone is measured straight up from the top of the barrier. Trim back overhanging vegetation; relocate any fixed structure inside the zone.

How NCZ Failures Are Recorded

If your barrier fails NCZ at inspection, the Form 24 non-conformance report includes:

• A photograph of each NCZ breach
• The specific item flagged (e.g., “Camellia within 600 mm of east boundary fence — climbable foothold”)
• The recommended remediation (relocation distance or removal)

NCZ remediation is more variable in cost than other Form 23 fails. Removing or relocating mature plantings can range $200 (one shrub) to $2000+ (mature palms requiring arborist removal). Check the Form 24 specifics before quoting remediation work.

The Pre-Inspection NCZ Walkthrough

Walk the entire inside perimeter of your pool fence. At every panel, ask:

1. Is there anything within an arm’s-length of the fence (≈ 900 mm) that I could stand on, climb on, or use as a foothold?
2. Is there anything overhanging or projecting from the fence itself within 300 mm above the top?
3. Are pool pumps, hoses, or pool storage hard against the fence?

If any answer is yes — fix before you book. NCZ breaches are usually faster and cheaper to fix than to fail-and-re-inspect.