Choosing between full scaffolding and edge protection comes down to the type of work, the height involved, and what WorkSafe NZ and the NZ Building Code require for your specific job. Getting this wrong isn't just a compliance issue — it's a serious safety risk. Here's a straightforward guide to help you understand the difference and make the right call.
What Is the Difference Between Full Scaffolding and Edge Protection?
Full scaffolding is a temporary structure — typically steel tube and fitting or modular system scaffolding — that provides a working platform at height. It gives workers a stable, load-bearing surface to stand on, store materials, and move around safely.
Edge protection (sometimes called perimeter protection or guardrailing) is a barrier system installed at the edge of a roof, deck, or elevated surface to prevent people from falling off. It doesn't provide a working platform — it simply stops someone from stepping or sliding over the edge.
Think of it this way: scaffolding is where you work from, while edge protection is what stops you from falling off.
The Key Factor: Working Height
Under New Zealand health and safety law, the critical threshold is 3 metres. WorkSafe NZ guidelines state that any work at or above 3 metres requires a formal fall prevention system. Below 3 metres, you still need to manage fall risks, but the controls may be less extensive.
Here's a general guide:
| Scenario | Likely Requirement |
|---|---|
| Painting or repairs below 3 m | Ladder or hop-up, risk assessment |
| Roof work on a single-storey home (3–4 m) | Edge protection at minimum; scaffolding often preferred |
| Gutter cleaning or fascia work on a single-storey | Edge protection or scaffolding depending on duration |
| Two-storey exterior painting or cladding | Full scaffolding typically required |
| Roofing, re-roofing, or roof tiling | Full scaffolding strongly recommended or required |
| Long-duration work at height | Full scaffolding for safe material handling and access |
When Edge Protection Is Usually Sufficient
Edge protection may be appropriate when:
- Workers are walking on or near a roof but not carrying out sustained work from the edge
- The roof pitch is low to moderate (generally under 25°) and the surface is stable
- The job is short in duration and workers can stay well clear of the edge
- A safety mesh or roof anchor system is also in place as a backup
Edge protection must meet specific standards — it typically needs to be at least 900 mm high with a top rail, mid rail, and toe board to comply with NZ requirements. Always confirm specifications with your scaffolding contractor.
When Full Scaffolding Is Required
Full scaffolding is generally needed when:
- Work is on a two-storey or higher building (typically 4 m or more above ground)
- Workers need to carry tools, materials, or equipment at height
- The job involves extended duration — such as a full exterior repaint or re-cladding
- The roof pitch is steep (over 25–30°), making it unsafe to stand on without a platform
- Work is being done on multiple elevations of the building
- The site has uneven ground or obstacles that make ladder access unsafe
- A building consent condition specifies scaffolding
For most two-storey re-roofing, re-cladding (such as James Hardie fibre cement systems), or full exterior painting jobs, a qualified scaffolder will almost always recommend full tube-and-fitting or modular scaffolding.
NZ Regulations and the Building Code
The MBIE Building Performance website outlines when building consents are required for temporary structures. Scaffolding itself generally doesn't require a building consent, but the work it supports might. Always check with your local council.
WorkSafe's guidelines for construction work reference the Health and Safety at Work Act 2015 and the Health and Safety at Work (General Risk and Workplace Management) Regulations 2016. These place a duty on PCBUs (businesses) and, in some cases, homeowners acting as a PCBU, to manage fall risks properly.
If you're a homeowner engaging tradespeople, you have a responsibility to ensure the work environment is safe. That means not pressuring contractors to skip proper fall protection to save money.
What About DIY Work at Home?
Homeowners doing their own work are still subject to health and safety obligations. If you're planning to get on your own roof, WorkSafe NZ strongly recommends using appropriate fall protection. Hiring scaffolding for a weekend DIY job is more affordable than many people expect, and far cheaper than a trip to the emergency department.
For guidance on safe working at height, BRANZ publishes practical research and guidance relevant to NZ residential construction.
When to Call a Professional
Always engage a qualified scaffolding contractor when:
- Work is at or above 3 metres
- You're unsure whether edge protection alone is sufficient
- The job involves a steep or complex roof
- Tradespeople such as roofers, painters, or builders will be working from the structure
A professional scaffolder will assess your specific site, roof pitch, job duration, and the trades involved before recommending the right solution. They'll also ensure the system is erected, inspected, and dismantled safely.
You can find qualified local scaffolders on tradedirectory.co.nz — it's always worth getting two or three quotes and asking each contractor to explain what they're recommending and why.
