Roof edge protection or a full scaffold: which do you actually need?
The short answer
If the only work is on the roof plane and you can get up from inside or a separate tower, roof edge protection is usually enough. If trades need to work at the facade, or materials have to land at height, you need a scaffold. Re-roofs that include gutter or fascia work usually need both.
Roofers ask us this constantly, and the honest answer is that it depends on one thing most quotes never ask about.
Not the roof. Not the height. Who's coming to site after you.
A re-roof with nothing following it is an edge protection job, and anyone quoting you a full perimeter scaffold for it is selling you gear you don't need. The same re-roof with a painter behind you was always a scaffold job, and finding that out in week three costs you two mobilisations and a hole in the program.
Everything below is how we work that out. Sometimes the answer is the cheap one. We'll tell you when it is.
What each one actually is
Roof edge protection is a barrier at the perimeter that stops someone going over the edge. Guardrail to the gutter line, parapet or roof edge, plus protection to any voids or skylights in the middle. It prevents a fall. It does not give anyone somewhere to stand.
A scaffold is a working platform with access. It gives trades a surface to work from at height, a safe way up, and somewhere to put materials. It also prevents falls, but that's a consequence of the platform rather than its purpose.
That distinction is the whole decision. Ask what your trades need to stand on. If the answer is "the roof", you're in edge protection territory. If the answer is "the wall", you need a scaffold.
How we quote
How to tell, in four questions
What exactly is being worked on?
Roof sheets, tiles and membranes are roof-plane work. Gutters, fascias, eaves, walls and windows are not, and they need somewhere to stand that isn't the roof.
Who else is coming to site after you?
This is the question that actually decides it, and the one nobody asks. A painter, renderer or window crew following a roofer means a scaffold was always in the job. Better to know before you install anything.
Where do the materials land?
If sheets, tiles or frames need to be landed and stored at height, you need a platform. Edge protection gives you nowhere to put anything.
How long is the program?
Two days of roof work is an edge protection job. Six weeks of staged trades is a scaffold, because the cost difference disappears against the labour of working badly for six weeks.
What it costs when you get it wrong
Edge protection is cheaper and faster. Guardrail on most single and two-storey roofs goes up in a day, against several for a perimeter scaffold, and you're hiring a lot less gear.
That's genuinely the right answer for a lot of jobs, and we'd rather sell you the cheaper one than talk you into gear you don't need.
The expensive mistake isn't choosing edge protection. It's choosing edge protection for a job that grows. Installing edge protection, striking it, then mobilising a scaffold three weeks later costs more than the scaffold would have cost on its own, because you pay two lots of mobilisation, two installs and a gap in your program where nobody could work.
So the question isn't "what's the cheapest thing that covers today's trade". It's "what does this job look like when it's finished". Answer that at quote stage and you pay once.
Can't we just use harnesses?
Sometimes, but it's the last resort rather than an equivalent option, and it's worth knowing why.
Managing the risk of falls works down a hierarchy. You start by trying to do the work without anyone being exposed to a fall at all. Then a fall prevention device, which is what a guardrail or a scaffold platform is, because it stops the fall happening. Then a work positioning system. Then a fall arrest system, which is where harnesses sit, because it doesn't prevent the fall, it catches you afterwards.
Fall arrest is last for practical reasons as well as legal ones. It needs anchor points that are rated, certified and current. It needs enough clearance below to arrest a fall without hitting anything. It needs a rescue plan, because a person hanging in a harness is an emergency on a clock. And it depends on every worker using it correctly every time.
A guardrail depends on none of that. Which is why, when both are workable, edge protection is the better answer even though the harness looks cheaper.
Sources
Questions
Common questions
Can you install edge protection on a tile roof?
Yes. Tile needs a different fixing approach to sheet metal, usually bracket systems that sit under the tile course and fix to the batten or rafter, and it takes longer to set. What matters more than the covering is what's underneath it, so we look at the battens and the rafters before we quote.
What about a solar install?
Solar is the classic edge protection job. Roof-plane work, short program, nobody working at the facade. The one thing to sort early is where the array and the conduit runs sit, because a guardrail line put in without that conversation ends up moving. Send us the layout with the enquiry.
Do you need a council permit for either?
Only if it goes over a footpath or road reserve, which is more common with a scaffold than with roof guardrail. On the Sunshine Coast that means Sunshine Coast Regional Council or Noosa Shire, and they run separate processes with different lead times. We tell you which applies and build the timing into the program.
Does edge protection need a handover certificate?
Where we install a scaffold, yes, under WHS Regulation 2011 (Qld) s225(2), along with inspections at least every 30 days. Standalone roof guardrail is a fall-prevention control rather than a scaffold, so s225 isn't the section in play, but you still get install and inspection documentation. Full detail in the handover guide.
Can you do both on the same job?
Yes, and on re-roofs it's the most common answer. The trick is the order. Getting the sequence right means one mobilisation instead of two, so tell us the whole scope at quote stage even if the later trades aren't booked.