For small, low-level repair jobs, a homeowner can construct a basic timber working platform — but only within strict safety limits set by New Zealand law. Once work reaches certain heights, the rules change significantly, and getting it wrong can result in serious injury or legal liability. Here's what you need to know before you pick up a single plank.
What NZ Law Says About DIY Scaffolding
In New Zealand, scaffolding and working-at-height safety is governed by the Health and Safety at Work Act 2015 and associated regulations, administered by WorkSafe NZ. The key principle is that any person who creates a work platform has a duty to ensure it is safe for anyone who uses it — including yourself.
For scaffolding over 5 metres in height, the work must be designed, erected, altered, and dismantled by a certificated scaffolder (a person holding a relevant certificate of competence). Below 5 metres, a competent homeowner may erect a basic platform, but you are still legally responsible for making it safe.
Height Rules at a Glance
| Platform Height | Who Can Erect It? | Key Requirements |
|---|---|---|
| Under 5 m | Homeowner (competent) | Must be structurally sound, safe access, no overloading |
| 5 m and above | Certificated scaffolder only | Engineering may be required |
| Any height (commercial/workplace) | Certificated scaffolder | Strict WorkSafe regulations apply |
Important: Even below 5 metres, a fall from height is one of the leading causes of serious injury in NZ. Never underestimate the risk.
Choosing the Right Timber
Not just any timber will do. Scaffold planks must be:
- Structurally graded — look for timber graded to NZS 3631 or equivalent. Standard framing timber is generally not suitable as scaffold decking.
- Free from large knots, splits, shakes, or decay that could compromise strength.
- A minimum of 50 mm thick for scaffold boards used as decking (check manufacturer or supplier guidance for your specific span).
- Long enough to overhang supports by at least 150 mm but no more than 300 mm at each end.
Ask your timber supplier — such as PlaceMakers or Mitre 10 — specifically for scaffold-grade planks and confirm they are suitable for the intended load and span.
Basic Principles for a Safe Timber Platform
If you're working below 5 metres and feel confident in your ability, follow these fundamentals:
- Stable base: Set up on firm, level ground. Use base plates or sole boards under any uprights to spread the load and prevent sinking.
- Adequate width: A working platform should be at least 450 mm wide for light work, and ideally 600 mm or more for comfort and safety.
- Secure planks: Boards must not be able to tip, slide, or move. Cleat or tie them in place.
- Safe access: Provide a proper ladder or stair access — never climb the scaffold structure itself.
- Edge protection: If the platform is more than 1 metre above the ground, you should fit guardrails (top rail at approximately 900–1100 mm) and a toe board to prevent tools or materials falling.
- Load limits: Never overload the platform. Know the weight of yourself, your tools, and any materials before you start.
- Inspect before use: Check every time before you step on it, especially after rain or wind.
BRANZ provides excellent guidance on safe working-at-height practices for homeowners and builders that is well worth reading before you start.
What You Cannot Do Yourself
Even for a small repair, there are situations where you must bring in a certificated scaffolder:
- Any platform 5 metres or higher.
- Work on steep or unstable ground where a standard platform cannot be safely levelled.
- Scaffolding attached to or tied into a building structure in a way that could affect the building's integrity.
- Any situation where other people (neighbours, passers-by, workers) could be at risk from a collapse.
Always check with WorkSafe NZ if you are unsure whether your situation requires a certificated professional.
Do You Need a Building Consent?
Temporary scaffolding erected for maintenance or repair is generally exempt from building consent under Schedule 1 of the Building Act 2004 — but this depends on the specific circumstances. Always confirm with your local council before proceeding, particularly if the scaffolding is large, attached to the building, or in place for an extended period. MBIE Building Performance has useful guidance on consent exemptions.
When to Call a Professional
If your repair job involves working above 5 metres, on a roof, on a multi-storey home, or in any situation where you feel uncertain about the stability of a platform, hire a certificated scaffolder. Professional scaffolding is faster to erect, engineered for safety, and gives you peace of mind. A qualified scaffolder will also carry the appropriate insurance.
You can find experienced, local scaffolders in your area right here on tradedirectory.co.nz. Getting a couple of quotes for even a small job is often more affordable than you might expect — and far cheaper than a trip to the emergency department.
