Stair Balustrade Regulations in Queensland — Plain English

Most stair balustrade compliance comes down to four key dimensions. Get these right and you'll satisfy the vast majority of inspectors.

The top of the handrail must sit at least 865 mm above the nosing pitch line — the imaginary line drawn through the tips of each tread. Many heritage handrails sit at 800–820 mm and need lifting before sale.

You can't just slide the handrail up — the balusters must lengthen with it, or you'll lose the non-climbable zone (more below).

Where the stair or landing has a fall of more than 1 m, the top of the balustrade must be at least 1000 mm above the finished floor or landing. This applies to virtually every high-set Queenslander.

For drops under 1 m, the handrail height (865 mm) is sufficient — no separate balustrade requirement.

No opening in the balustrade may exceed 125 mm in any direction. The intent is simple: a small child's head cannot pass through. This is the most commonly broken rule on heritage homes, which often have 150–200 mm picket gaps.

Fixing it is straightforward: add infill timber strips, swap to closer-spaced balusters, or fit a stainless steel wire balustrade (which easily meets 125 mm).

Between 150 mm and 760 mm above the floor, the balustrade must have no horizontal or near-horizontal elements that a child could climb. Decorative rails, mid-rails and even some wire systems can fail this requirement.

This is the rule that catches out the most renovators. A beautiful three-rail timber balustrade may look perfect — and still fail certification.

These requirements come from NCC 2022 Volume One, Part D3 and Volume Two, Part 11.3 — Safe Movement and Access. Always check the current edition; the NCC is updated on a 3-year cycle.

For confirmation that your carpenter is licensed to do compliance-related work, check the QBCC licence register before you sign anything.

Carpentry Worx builds code-compliant external stair balustrades across Brisbane, Moreton Bay and the Sunshine Coast — including discreet retrofits on heritage Queenslanders. See our full external stairs service or request an assessment.