Scaffolding safety depends on four things: a scaffold that is built, altered and dismantled only by competent people, one that is inspected by a competent person, safe ways to get on and off it, and workers who use it as designed. Scaffolds are a common way to work at height, and falls from height are a major cause of serious injury in construction. If you are not trained and authorised to alter a scaffold, you must not touch the structure.
Key takeaways
- Only competent people should erect, alter and dismantle a scaffold.
- A scaffold should be inspected by a competent person (check the regulations and HSE guidance for the detail), and you should not use it if it has not been checked or is tagged as unsafe.
- Guardrails, toe boards and sound working platforms are there to stop people and materials falling.
- Use the designated access, such as a stair tower or a ladder fixed in place, and never climb the outside of the frame.
- Do not overload a scaffold, and do not remove or change any part of it, including ties, boards and guardrails.
- Report damage or missing parts straight away and keep off the area until they have been put right.
What the law and HSE guidance expect
Scaffolding is a type of access equipment used for work at height, so it is covered by the Work at Height Regulations 2005. A widely used general approach is to avoid working at height where you can, use equipment or other measures to prevent falls where you cannot, and reduce the distance and consequences of a fall if the risk cannot be removed. Check the regulations and the HSE work at height page, listed in the Sources section, for the exact duties.
HSE's construction guidance, HSG150, deals with managing health and safety on construction sites and is the wider reference for site work. This article describes the principles rather than quoting figures. Specific requirements, such as inspection timings and load limits, should be taken from the current HSE guidance, the scaffold designer's information and your site's own arrangements.
Our wider guides on working at height basics and fall prevention on site give the bigger picture. This article focuses on the scaffold itself.
Competence: who builds and checks a scaffold
A scaffold is a structure that people rely on to hold their weight, so the people who build it need the training, skill and experience to do it safely. In practice, this means:
- Erecting, altering and dismantling are done by trained scaffolders who work to the design or the agreed method for that scaffold.
- Inspection is carried out by a competent person who knows what to look for, such as missing components, damage, signs of movement and changes since the last check.
- Handover happens when the scaffold is complete. The scaffolder or the site manager should make clear that the scaffold is safe to use and what its limits are.
The regulations expect scaffolds to be inspected at certain points, including before first use and after anything that might have affected safety, such as severe weather or an alteration, and at suitable intervals while in use. The detail, including how the result is recorded, is in the HSE guidance and the regulations, so check the official sources for exact requirements. Many sites also use a tagging system at access points to show whether a scaffold is ready to use. Learn what your site's tags mean and always follow them.
If you are not sure whether a scaffold has been inspected, ask. If the tag says it is not to be used, or if it has been changed, do not use it.
Safe scaffolding features
Working platforms
Platforms need to be fully boarded where people work, with sound boards that are properly supported and secured so they cannot move. Gaps should be avoided, and platforms should be kept clear of materials, waste and equipment that create trip hazards.
Guardrails and toe boards
Guardrails stop people falling from the platform edge, and toe boards stop tools and materials falling off. Both should be in place on open edges where people can fall or where objects can drop onto people below. Never remove a guardrail, even for a minute, to pass something through, and never lean on or climb over one.
Access
Use the access the scaffold has been designed with, such as an internal ladder or a stair tower. Do not climb on the frame, the guardrails or the outside of the structure. Keep a firm hold when climbing a ladder, and do not carry loads that stop you holding on. Hoist materials instead.
Ties, bracing and bases
Ties connect the scaffold to the building and bracing keeps it rigid. The base needs to be on firm, level ground and supported by sole boards or base plates as designed. If you see a tie missing, a brace removed or the ground around a base dug away, stop and report it.
Loading: do not overload
A scaffold is designed for a particular duty. If you stack too many materials in one place or load a platform beyond what it was designed for, you risk collapse or movement. Check the scaffold's design information or ask the person in charge what loads it can take. Spread materials, do not stockpile on the platforms, and move them away once the job is done. Be especially careful of loading one bay with heavy items such as bricks, blocks or tiles.
Do not modify a scaffold
Only competent scaffolders should alter a scaffold. That means you should not:
- remove ties, braces, guardrails, toe boards, boards or ladders
- move or remove sheeting or netting without approval
- attach hoists, signs or lighting without approval from the scaffolder or the person in charge
- tie off or hang equipment from parts that were not designed to take the load
- extend the scaffold or add bays on your own
If the scaffold gets in the way of your task, ask for it to be altered by the right people. Altering it yourself is dangerous and means the next person to use it has no idea it has changed.
Quick checklist before stepping onto a scaffold
- Is the scaffold tagged or marked as safe to use, and have I checked the date or status?
- Can I see the access I should use?
- Are the guardrails, toe boards and boards all in place and secure?
- Are there any signs of damage, missing parts, movement or changes?
- Is the platform clear of waste, and is the load within what it can take?
- Do I know who to report problems to?
- Has anything changed since I last used it, such as bad weather or work by another trade?
Practice check
These two questions are original practice items written for this site. They are not official test questions and give no official result. This site is independent and is not affiliated with CSCS or CITB.
Question 1. You need to move a scaffold guardrail to get a tall item onto the platform. What should you do?
- A. Remove it, then put it back as quickly as you can.
- B. Ask a colleague to hold you while you lean over.
- C. Remove it only if the platform is below head height.
- D. Do not remove it yourself, and ask the scaffolder or person in charge for a safe way to get the item up.
Answer: D. Only competent people should alter a scaffold, and guardrails must stay in place to prevent falls.
Question 2. You arrive at a scaffold and notice a missing toe board on a section where people will work below. What is the correct action?
- A. Work somewhere else on the scaffold and report it later.
- B. Do not use that section, tell your supervisor and keep others away until it is fixed.
- C. Lay a spare board loosely in its place.
- D. Use the section carefully and avoid knocking anything off.
Answer: B. A missing toe board is a defect that creates a risk to people below. Stop using the section and report it so a competent person can put it right.
Find more in our free practice questions.
FAQ
Who is allowed to alter a scaffold?
Only competent, trained people, usually scaffolders, should erect, alter or dismantle a scaffold. If you need a change, ask your supervisor to arrange it. Do not remove or move any part yourself.
How often must a scaffold be inspected?
It should be inspected by a competent person at certain points, including before first use, after events that could affect its safety and at suitable intervals while in use. The exact requirements are in the Work at Height Regulations 2005 and HSE guidance, so check the official pages. Your site will also have its own system for recording and showing the result.
What should I do if I find damage on a scaffold?
Stop using the affected area and keep others away if it is safe to do so. Tell your supervisor straight away so a competent person can check and repair it. Do not try to fix it yourself.
Can I climb the outside of a scaffold to save time?
No. Use the designated access, such as a stair tower or fixed ladder. Climbing the frame or guardrails puts you at risk of falling and is not what the structure was designed for.
Sources
Independent guide, not affiliated with, authorised by, approved by or endorsed by CSCS or CITB. Last updated 2026-10-08.