Scaffold tags: what green, yellow and red actually mean

Scaffold tags are a control, not the law

Let’s get the big point straight. Scaffold tags are not a legal requirement on their own. They are a tidy way to show who can get on, what has been checked and when the next check is due. The legal duty is the inspection itself and the written report. That comes from the Work at Height Regulations 2005 reg 12 and Schedule 7, which require inspection after erection, at intervals not exceeding seven days, and after anything that could affect stability, with a report kept for three months.

Why use a tag then. Because on a wet Tuesday, when the roofers are chasing a dry spell and the brickies have moved a couple of ledgers for a hoist, nobody is pulling the file to check the last report. A tag at access points makes the inspection regime visible and helps control access. The brand most of us see is Scafftag, but plenty of systems exist. The colour coding is a convention agreed on site, not an act of Parliament.

Current NASC guidance backs the idea of clear, simple communication at the scaffold, and of competence for those who inspect and alter. The tag is part of that picture, along with the handover certificate, TG20 compliance sheets or design drawings, and the inspection reports. If the paperwork says one thing and the scaffold in front of you says another, the tag should not overrule your eyes. Shut it down and call the scaffolder.

What green, yellow and red mean in practice

Green usually means good to go, within the limits shown on the insert. In plain terms, the scaffold has been erected or inspected by a competent person, handed over, and is fit for the stated duty and configuration. That could be a TG20-compliant independent with three boarded lifts for bricklaying, or a designed birdcage for ceiling install. The insert should show the date, inspector’s name, company, next due date, and ideally the drawing or TG20 reference and load class.

Yellow often means caution or restricted use. On many jobs, scaffs put up yellow during erection and alteration, or where a lift is open for loading and controlled. You might see a bay signed as “no access beyond this lift” or “roofers only” with edge protection unfinished. This is a management tool, not a loophole. If someone climbs past the limit and gets hurt, a yellow tag is not a magic shield. Either segregate or complete the protection.

Red means do not use. That could be because the scaffold is incomplete, there is storm damage, ties are out, a ledger has been cut for a window delivery, or the weekly inspection has found defects that need putting right. Red is a quarantine, and it should be backed by a physical barrier or removal of ladders where possible. If you see red on a Monday morning after a Sunday gale, hold the line and wait for the competent person to inspect and clear it.

For the legal timings and what to capture in the report, see Scaffold inspections: how often, who can do them, what to record.

Who changes a tag and how handover links in

The person who changes a tag should be the scaffolding contractor or a competent person appointed to inspect that scaffold. The site manager should not be swapping a red for a green because the programme is tight. Competent means training, knowledge and experience appropriate to the scaffold. For complex or designed structures, that will usually be a CISRS Advanced Scaffolder or Scaffold Inspector. For simple towers, PASMA-trained supervisors may inspect the tower they control, but that is a separate system.

On first use, the tag should follow the handover. The scaffolding contractor erects to the drawing or TG20 compliance sheet, checks it, and issues a handover certificate stating what has been built and to what standard. Then the insert goes green with the same details and a next inspection date. The handover certificate is the foundation, the weekly inspections stack on top, and the tag is the quick flag everyone can see at the ladder.

If the scaffold is altered, the status must change until a competent person re-inspects. The classic failure is a green tag left in place after a bay has been opened for a window or a tie has been moved to fit cladding rails. That is not a green scaffold anymore. Drop it to red, block access, note what changed and call the scaffs. Current NASC guidance is clear that only competent persons should alter scaffold and that all alterations must be re-inspected.

Inspections, frequency and what the tag is proving

The law sets the inspection drumbeat. Inspect after initial erection, then at intervals not exceeding seven days, and after exceptional circumstances such as high winds or impact, as required by the Work at Height Regulations 2005 reg 12. The written report must include the particulars listed in Schedule 7 and be kept on site or at an accessible office for three months. The tag is not the inspection report. It points to the fact that one exists and when the next is due.

A decent insert does more than show a date. It should say who inspected, for which company, what the scaffold is, where it is, and what standard it was inspected to, along with any restrictions like “no loading bays beyond lift two” or “incomplete lift five”. If there is a design drawing or a TG20 compliance sheet, write that number. If it is a loading tower, state the capacity. When you stand at the ladder and sniff the dust from cut cement board, the insert should make sense of what you are about to climb.

Record keeping matters when something goes wrong. The seven-day rhythm sounds simple until you hit bank holidays, wind delays and night shifts. Missed inspections mean the scaffold is not legally cleared for use and should be red tagged and blocked. We see good sites keep a shared schedule, line the inspection day up with the programme, and avoid the Friday rush. The inspection regime proves that the scaffold has stayed within design and remained safe between checks, which is what the tag is really signalling.

If you need to reference or build your method statements around the tag process, the Scaffolding RAMS Template UK | RAMS AI sets out a practical structure.

Common failures and how to stop them

Green tag on an altered scaffold is number one. A chippy takes a guardrail out for a window drop, promises to put it back, then the lift is left open. Or a tie is removed to fix rainscreen rails, the load path changes, and nobody calls the scaffs. If you find an alteration, do not shrug. Red tag it, remove the ladder if safe to do so, and get the scaffold contractor back. That is not being awkward, that is stopping a fall.

Missing toeboards and unboarded returns are next. You see it on busy facades. Someone removes a board for a detail, the sweepings pile up, and a windy afternoon does the rest. A green tag from Monday does not cover an exposed edge on Thursday. Use red to quarantine, then complete edge protection and tidy up before re-inspection. Current NASC guidance on preventing falls makes clear that collective protection should be maintained during all phases of work.

Weather is the silent vandal. A Sunday squall rattles a sheeted elevation, loosens fittings or moves a tie, and we turn up Monday half asleep. If the wind has been rough, treat green tags with caution until a competent person has checked. Reg 12 of the Work at Height Regulations 2005 requires re-inspection after events likely to affect safety. Good sites also brief trades not to climb until the go-ahead is given, and they mark ladders out of use on storm mornings.

Make tags work inside your RAMS and site rules

The tag system only works if your RAMS and site rules back it up. Your method statements should say who controls access to incomplete scaffolds, how ladders are locked off, who holds spare inserts, and the steps to follow if a defect is found. For night shifts, name the competent person who can call the scaffolder out or red tag and stand the work down. For storms, set a simple trigger for re-inspection. Keep it short so supervisors can actually do it at 6 am.

Integrate tags with design compliance. If the scaffold is TG20 compliant, state the compliance sheet number and duty class at the tag. If it is a designed special, write the drawing reference and any unique limits, like a cantilever lift that must not be loaded. If you add a loading bay or hoist, adjust the insert after the competent re-inspection. A tag that matches the drawing saves arguments and keeps everyone honest.

Finally, treat the tag as a control at the access point, not a museum label. Put them where people actually climb, not ten metres away under a scaffold fan. Use clear plastic covers that survive a downpour. Replace rain-blurred inserts. If the site is using a yellow phase for alterations, brief all trades at induction and remind them at the morning briefing. When the programme gets messy, it is the small, boring controls that keep people off bad lifts.

Questions we get asked

Are scaffold tags a legal requirement in the UK?

No. The law requires scaffold inspections and written reports, not coloured tags. That duty sits in the Work at Height Regulations 2005 reg 12 and Schedule 7. Tags are a widely used way to visibly show inspection status and control access at the ladder, which helps you run the legal inspection regime in practice.

How often should a scaffold be inspected and the tag updated?

Inspect after erection, at intervals not exceeding seven days, and after events that could affect safety such as high winds, as required by the Work at Height Regulations 2005 reg 12. Update the tag at each inspection so it shows the latest status, the next due date, and any restrictions. Remember, the tag is not the inspection report.

Who is allowed to change a scaffold tag from red to green?

The scaffolding contractor or a competent person appointed to inspect that scaffold should change status. Competent means they have the right training, knowledge and experience for the scaffold. General site staff or trade supervisors should not flip a tag to green to suit the programme. Current NASC guidance supports that only competent persons should alter or clear scaffolds.

What should be written on the scaffold tag insert?

Add the date, inspector’s name and company, scaffold location and description, standard it was checked against, next inspection due date, and any restrictions. If there is a TG20 compliance sheet or a design drawing, include the reference. If there is a loading bay or special limit, write the capacity or rule clearly.

What happens if there is no tag at the ladder?

Treat it as unknown. If you cannot verify a current inspection report and status, do not climb. Red tag or lock off ladders, then contact the scaffolding contractor or competent person to inspect and update the status. The inspection duty sits with the Work at Height Regulations 2005 reg 12, regardless of whether a tag is present.

The short version

Scaffold tags are a simple way to show inspection status at the ladder. Green means the scaffold has been inspected and is fit for the configuration shown. Yellow often means restricted use or work in progress. Red means do not use. The colours are not law, but they sit on top of the legal inspection regime.

The Work at Height Regulations 2005 reg 12 and Schedule 7 require inspections after erection, at seven-day intervals, and after events that could affect safety, with reports kept for three months. The tag is proof that the regime is happening, not a replacement for the report. Only competent people should alter or clear a scaffold and change its tag.

Build the tag system into your RAMS and site rules. Put useful details on the insert, place tags at access points, and never let a green tag survive an alteration or a storm. That is how the colours earn their keep on busy UK sites.