Falls from height are one of the leading causes of serious injury on New Zealand building sites — and that includes DIY projects at home. Whether you're re-roofing, painting the eaves, or having a builder do an extension, you've probably heard the terms scaffolding and edge protection used interchangeably. They're not the same thing, though, and choosing the wrong system (or none at all) can have serious consequences for safety and legal compliance.
What Is Scaffolding?
Scaffolding is a temporary, load-bearing structure erected around or alongside a building to give workers a safe, stable platform to stand on while carrying out work at height. It typically consists of steel or aluminium tubes, couplers, and timber or aluminium planks (boards), assembled into a working platform with guardrails.
Scaffolding is designed to:
- Support the weight of workers, tools, and materials (e.g., bundles of tiles, paint equipment, timber)
- Provide a working deck at one or more levels
- Allow workers to move along the face of a building comfortably
- Incorporate toe boards, mid-rails, and top rails to prevent falls and falling objects
Common scaffolding types you'll see on NZ homes include tube-and-coupler scaffolding, modular (system) scaffolding, and mobile scaffold towers.
What Is Edge Protection?
Edge protection is a safety barrier system installed at the edge of a roof, floor, or elevated surface to prevent people from falling over that edge. Unlike scaffolding, edge protection is not designed as a working platform — it's purely a fall prevention barrier.
On a typical NZ residential roof, edge protection usually consists of posts anchored to the roof structure or fascia, with horizontal rails (and sometimes mesh or boards) forming a barrier around the roof perimeter. It's commonly used when roofers, painters, or solar installers need to work on or near a roof edge.
Edge protection is designed to:
- Prevent falls over open edges, roof perimeters, and floor openings
- Be quick to install and remove compared to full scaffolding
- Meet the requirements of WorkSafe NZ for work at height
- Comply with NZ Building Code and site safety obligations
Key Differences at a Glance
| Feature | Scaffolding | Edge Protection |
|---|---|---|
| Primary purpose | Working platform + fall prevention | Fall prevention only |
| Supports materials/tools | Yes | No |
| Forms a working deck | Yes | No |
| Installed at roof perimeter | Sometimes | Yes, typically |
| Suitable for multi-level work | Yes | No |
| Relative cost | Higher | Lower |
| Typical use | Painting, cladding, roofing, construction | Roofing, re-roofing, solar installs |
When Is Each System Required in NZ?
Under the Health and Safety at Work Act 2015 and associated regulations, any work at height where there is a risk of falling must be managed with appropriate controls. WorkSafe NZ guidance generally requires fall protection for work at 3 metres or more above a lower level, though risk must be assessed at any height.
Scaffolding is typically required when:
- Workers need to carry materials to height (e.g., roofing tiles, cladding sheets)
- Work is ongoing over several days at height
- Multiple trades need access at different levels
- The work involves the full face of a building (e.g., re-cladding, painting multi-storey homes)
Edge protection is typically sufficient when:
- Tradespeople are working on a roof surface and need perimeter fall prevention
- The work doesn't require a separate elevated working platform
- A licensed scaffolder has assessed it as appropriate for the task
For guidance on what's required for your specific project, BRANZ publishes research and best-practice guidance for the NZ building industry.
Does a Homeowner Need to Worry About This?
If you're hiring tradespeople, it is the contractor's responsibility to ensure appropriate fall protection is in place under the Health and Safety at Work Act. However, as a homeowner (and a Person Conducting a Business or Undertaking, or PCBU, if you're managing the project), you also have duties to ensure the site is safe.
In plain terms: don't let a tradie work on your roof without proper edge protection or scaffolding in place. If a contractor tells you they don't need it, ask them to show you their risk assessment.
For DIY work, be honest with yourself about the risks. Working on a ladder against a two-storey wall or walking on a roof without edge protection is genuinely dangerous. The MBIE Building Performance website has useful information on what work homeowners can and cannot do themselves.
When to Call a Professional
Scaffolding and edge protection must be designed, erected, altered, and dismantled by a competent person — in practice, this means a licensed scaffolder. In New Zealand, scaffolding over a certain height and complexity falls under restricted building work or requires specific competency under WorkSafe regulations.
Do not attempt to erect tube-and-coupler scaffolding yourself unless you are trained and competent. Incorrectly assembled scaffolding can collapse without warning. Even hiring scaffolding equipment and putting it up yourself carries significant risk and liability.
For edge protection systems specifically designed for residential roofs, a qualified scaffolding company will assess your roof pitch, height, and work type, then install a compliant system. This is a relatively affordable safety measure that protects both the workers and you as the homeowner.
You can find licensed, experienced scaffolders in your area at tradedirectory.co.nz.
A Quick Note on Costs
As a very rough guide, edge protection for a standard single-storey NZ home is generally less expensive than full scaffolding, though prices vary considerably depending on roof size, pitch, height, and location. Always get at least two or three quotes and make sure the system proposed meets WorkSafe requirements for your specific job.