The short answer
Scaffolding in the UK is governed mainly by the Work at Height Regulations 2005, which require work at height to be properly planned, supervised and carried out by competent people, with equipment kept safe. A scaffold must be designed and erected to a recognised standard — for common configurations this means compliant with NASC TG20, while more complex or non-standard scaffolds need a bespoke design. The people erecting it should be competent, typically holding CISRS qualifications. The structure must be inspected by a competent person before first use, at least every 7 days while it remains in place, and after any alteration or adverse weather, with the inspection recorded. The Health and Safety at Work etc. Act 1974 sits over all of this. These duties apply whether or not a highway licence is also needed.
A highway licence answers where a scaffold can stand; the safety regime answers whether the structure itself is fit to be used. The two run in parallel, and the safety rules apply to every scaffold.
Scaffold safety rules at a glance
- Main regulationsWork at Height Regulations 2005
- Design standardNASC TG20 (standard) or bespoke design
- CompetenceTypically CISRS-qualified erectors
- InspectionBefore use, every 7 days, after alteration/weather
- Overarching lawHealth and Safety at Work etc. Act 1974
The Work at Height Regulations 2005
The cornerstone of scaffold safety is the Work at Height Regulations 2005. They require that work at height is avoided where reasonably practicable, and where it cannot be avoided, that it is properly planned, appropriately supervised, and carried out in a safe manner by people who are competent. Scaffolding is one of the principal ways of providing safe access for work at height, and the Regulations require the equipment used to be suitable, stable and strong enough for the job.
The Regulations also require that working platforms and access scaffolds are inspected at intervals to confirm they remain safe, and that defects are put right. They are enforced by the Health and Safety Executive (HSE), and sit beneath the broader duty in the Health and Safety at Work etc. Act 1974 to protect workers and others affected by the work. For a homeowner, the practical effect is that any scaffold on your job should be erected by a firm that plans and supervises the work and inspects the result, rather than thrown up informally.
Design standards, competence and inspection
Beyond the headline duty to be safe, three things give a scaffold its practical assurance: how it is designed, who builds it, and how it is checked.
- Design standard: common scaffolds are built to NASC TG20, the industry technical guidance that defines compliant configurations for standard tube-and-fitting scaffolds. Scaffolds that fall outside TG20 — unusual loads, shapes or heights — require a bespoke engineered design.
- Competence: the people erecting, altering and dismantling the scaffold should be competent, which in the UK normally means holding a CISRS (Construction Industry Scaffolders Record Scheme) card appropriate to the work.
- Inspection: a competent person must inspect the scaffold before first use, at intervals not exceeding 7 days while it is up, and after any alteration or event (such as high winds) likely to have affected its stability, recording the result.
Together these mean a compliant scaffold is not just 'put up' but designed to a standard, built by trained people, and verified on a schedule. The table summarises how these pieces fit together.
| Element | What it covers | Reference |
|---|---|---|
| Planning & competence | Safe planning, supervision, trained erectors | Work at Height Regs 2005; CISRS |
| Design | Standard config or bespoke engineered design | NASC TG20 / bespoke design |
| Inspection | Before use, 7-day, after alteration/weather | Work at Height Regs 2005 |
| Overarching duty | Protecting workers and the public | HSWA 1974 |
General guidance on the framework — confirm current detail with the HSE. Sources: HSE; NASC; CISRS.
Where each set of rules comes from
Scaffold safety can feel like a tangle of overlapping rules, but each piece has a distinct role, and seeing how they fit together makes the framework clearer:
- Health and Safety at Work etc. Act 1974: the overarching duty to protect workers and anyone else affected by the work — the foundation everything else sits on.
- Work at Height Regulations 2005: the specific rules for working at height, covering planning, competence, suitable equipment and inspection. This is the regulation most directly about scaffolding.
- NASC guidance (including TG20): industry technical standards that define compliant scaffold configurations and good practice, used to demonstrate a scaffold meets a recognised standard.
- CISRS: the recognised competence scheme for scaffolders, evidencing that the people building the structure are trained for the work.
The first two are law; the second two are the standards and competence that show the law is being met in practice. A scaffold that is planned and inspected under the Work at Height Regulations, built to a TG20-compliant configuration (or a bespoke design where needed), by CISRS-carded operatives, ticks all four boxes. For a homeowner this layered picture is reassuring rather than daunting: you do not need to master the detail, but you can recognise a contractor who works within it. Because the law and the guidance are reviewed over time, the HSE, NASC and CISRS are the places to confirm the current position if you want to check a specific point.
How the rules protect everyone around the scaffold
Scaffold safety law is not only about the people working on the structure; it protects anyone who could be affected — the household, neighbours and members of the public passing beneath. That is why the duties cover not just the platform itself but guard rails, toe boards, ties, bracing and the prevention of falling objects. A scaffold that is stable and complete protects the workers from falls and protects passers-by from dropped tools or materials.
For a homeowner commissioning work, the most reliable signal that these rules are being met is a competent scaffolding contractor: one who erects to a recognised standard, employs CISRS-carded operatives, holds adequate insurance, and inspects the structure on schedule with a written record. You are not expected to interpret the regulations yourself, but knowing what good looks like helps you choose a firm that takes them seriously. Because the regulations are technical and can be updated, the HSE and the trade body NASC are the authoritative sources, and anyone with a specific safety concern about a scaffold can raise it with the HSE.
Frequently asked questions
What law covers scaffolding safety in the UK?
The main rules are the Work at Height Regulations 2005, which require work at height to be planned, supervised and carried out safely by competent people, with equipment kept safe and inspected. They sit under the Health and Safety at Work etc. Act 1974 and are enforced by the HSE.
What is NASC TG20 and does my scaffold need it?
TG20 is NASC industry guidance defining compliant configurations for standard tube-and-fitting scaffolds. Common domestic scaffolds are usually built to TG20, while non-standard scaffolds — unusual heights, loads or shapes — need a bespoke engineered design instead.
Who is allowed to erect scaffolding?
Scaffolding should be erected, altered and dismantled by competent people, which in the UK normally means operatives holding a relevant CISRS card. Competence, proper planning and inspection are required under the Work at Height Regulations 2005.
Sources & further reading
- HSE — Work at height: scaffolding
- Work at Height Regulations 2005 (legislation.gov.uk)
- NASC — National Access and Scaffolding Confederation
Figures on this page are typical UK ranges drawn from published sources and depend on your specific job. They are guidance, not a quotation.