A ladder can be a perfectly safe and practical alternative to scaffolding for many short-duration, low-level tasks around the home — but only when the job, the ladder, and the conditions are all right for it. Understanding the limits of ladder work, and knowing when a job genuinely calls for scaffolding, could save you from a serious fall. Falls from height are one of the leading causes of serious injury in New Zealand, so it pays to get this right.
When Is a Ladder Acceptable?
As a general rule, a ladder is suitable for light, short-duration tasks where you need both hands free only briefly, and where you can maintain three points of contact most of the time. Good examples include:
- Cleaning gutters at single-storey height
- Replacing a light fitting on a soffit (though electrical work has restrictions — see below)
- Painting a small section of fascia or weatherboard
- Trimming a hedge or small tree
If the task requires you to carry heavy materials, use both hands continuously, or work for extended periods at height, scaffolding is the safer choice. WorkSafe NZ provides clear guidance on managing fall risks, and their advice applies to homeowners doing DIY, not just professional workers.
Choosing the Right Ladder
Not all ladders are equal. In New Zealand, ladders are rated by duty rating (the maximum load they can safely carry, including you and your tools):
| Duty Rating | Max Load | Typical Use |
|---|---|---|
| Light (Class III) | 100 kg | Occasional household tasks |
| Medium (Class II) | 120 kg | Regular DIY use |
| Heavy (Class I) | 150 kg | Trade/frequent use |
| Industrial (Class IA) | 175 kg | Heavy trade use |
For most homeowners, a Class II or Class I fibreglass or aluminium extension ladder is a sound investment. Fibreglass ladders are non-conductive and a better choice if there is any chance of working near power lines or electrical fittings.
Check that any ladder you buy or borrow meets AS/NZS 1892, the Australian/New Zealand standard for portable ladders. You can confirm standards at Standards NZ.
Setting Up Your Ladder Safely
Proper setup is where most ladder accidents begin. Follow these steps every time:
The 1-in-4 Rule
For a leaning (extension) ladder, position the base 1 metre out from the wall for every 4 metres of height. This gives the correct angle of roughly 75 degrees.
Secure the Top and Bottom
- Rest the ladder against a solid surface — not guttering, which can collapse.
- Use ladder standoffs (ladder stays) to keep the ladder away from the wall and protect gutters.
- Tie the top of the ladder to a fixed anchor point where possible.
- On soft ground, use a ladder foot plate or have a second person foot the ladder.
- On hard, smooth surfaces, ensure the rubber feet are in good condition and not worn.
Check Your Surroundings
- Never set up a ladder in front of a door that could be opened into it — lock or barricade the door first.
- Keep well clear of overhead power lines. WorkSafe NZ recommends maintaining at least 4 metres clearance from live lines for non-conductive ladders, and more for conductive ones. If in doubt, contact your lines company.
- Avoid working on a ladder in high winds or wet conditions.
Extension Ladder Overlap
Always ensure the two sections of an extension ladder overlap by at least three rungs for stability.
Safe Working Practices on a Ladder
- Always maintain three points of contact (two hands and one foot, or two feet and one hand) when climbing or descending.
- Keep your belt buckle between the stiles (side rails) — never lean out to the side.
- Do not carry heavy or bulky items up a ladder; use a tool belt or hoist materials separately.
- Never have two people on a single ladder at the same time.
- Wear sturdy, closed-toe footwear with good grip — no jandals.
- Inspect the ladder before each use for cracked rungs, bent stiles, or damaged feet.
Height Limits and When Scaffolding Is Required
There is no single legal height at which a homeowner must use scaffolding instead of a ladder for DIY work, but WorkSafe guidance and common sense point to 3 metres as a practical threshold. Above this height, the consequences of a fall become much more serious, and scaffolding or an elevated work platform (EWP) should be strongly considered.
For roof work — including re-roofing, roof painting, or installing roof penetrations — edge protection or scaffolding is strongly recommended regardless of height. The NZ Building Code and WorkSafe both treat roof work as a high-risk activity.
If your project requires a building consent, your council may specify how work at height must be managed. Always check with your local council before starting.
When to Call a Professional
Some tasks should always be left to licensed tradespeople, regardless of whether you use a ladder or scaffolding:
- Electrical work: Connecting or modifying wiring, switchboards, or fixed electrical fittings is restricted work under the Electricity Act and must be carried out by a registered electrician. Check the Electrical Workers Registration Board (EWRB) to verify a sparky's registration.
- Gas work: Any work on gas lines or appliances is restricted to licensed gasfitters registered with the Plumbers, Gasfitters and Drainlayers Board (PGDB).
- Structural or complex roofing work: Work that affects the weathertightness or structure of your home may require a Licensed Building Practitioner (LBP) and possibly a building consent.
- Any work above 3 metres: Consider hiring a professional scaffolder who can erect a safe working platform. You can find qualified local scaffolders on tradedirectory.co.nz.
A professional scaffolder will ensure the platform meets safety requirements and gives you — or your tradespeople — a stable, legal place to work.
