UK construction-safety guidance by the Riskora Editorial Team
Producing a proper risk assessment for scaffold erection is not optional — it is a legal and practical requirement for construction work in the UK. Whether you are a sole trader or managing a multi-phase project, documented risk management protects your workers, satisfies clients, and keeps you on the right side of HSE enforcement.
Example Risk Assessment
Risk Assessment for Scaffold Erection
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The Management of Health and Safety at Work Regulations 1999 require employers to carry out a suitable and sufficient risk assessment for scaffold erection before operations start. Self-employed workers carrying out construction activities must also comply.
A construction contractor in UK needs to produce a risk assessment for scaffold erection before starting work next week. The client has requested professional documentation as a condition of site access. Using Riskora, they select the relevant trade preset, review pre-populated hazards, adjust controls for their specific site, and generate a professional risk assessment in under 5 minutes — ready for review and sign-off.
The Work at Height Regulations 2005 apply to the scaffolders as much as to the trades who follow them, and regulation 12 requires inspection by a competent person before first use, at intervals not exceeding seven days, and after any event likely to affect its strength or stability — with the report kept until the work is complete. NASC's TG20:21 defines what a compliant tube-and-fitting scaffold looks like, and anything outside its scope requires a bespoke design.
Work at Height Regulations 2005 (including reg 12 inspection) · SI 2005/735
HSE
CDM Regulations 2015 · SI 2015/51
HSE
Provision and Use of Work Equipment Regulations 1998 · SI 1998/2306
HSE
BS EN 12811 — Temporary works equipment
BSI
Two documents decide whether a scaffold package is accepted: the TG20 compliance sheet or bespoke design, and the SG4 statement of how the scaffolders themselves stay attached while building it. Almost every rejected scaffolding submission is missing one of them, because the writer covered the safety of the people using the finished scaffold rather than the people building it.
| Hazard | Control measure |
|---|---|
| Falls by scaffolders during erection, alteration and dismantling | SG4 compliant method with advance guardrails or a safe zone, harness clipped to a suitable anchor when working outside the safe zone, and a rescue plan with equipment on site. |
| Structural collapse from missing ties, overloading or unauthorised alteration | TG20:21 compliance sheet or a bespoke design for anything outside its scope, tie pattern and tie tests recorded, loading class stated on the handover tag, and a written prohibition on alteration by anyone but a competent scaffolder. |
| Dropped tubes, fittings and boards | Exclusion zone below the erection line with barriers and a marshal, no throwing of materials, gin wheel or hoist used for material movement, and toeboards and brick guards fitted as the lift is completed. |
| Contact with overhead power lines during tube handling | Overhead lines identified before erection, exclusion zones and goalposts to GS6, and diversion or isolation agreed with the DNO where safe clearance is not achievable. |
| Inadequate foundations, uneven ground or proximity to excavations | Sole boards and base plates on assessed ground, no standard founded within the zone of influence of an excavation, and the base condition re-checked at every inspection. |
| Use of an incomplete or unsafe scaffold by other trades | Scafftag or equivalent system with the scaffold physically signed as incomplete and access blocked until handover, and reg 12 inspection before first use, every 7 days thereafter, and after any event likely to affect stability. |
Every scaffold needs to be either compliant with TG20:21 — evidenced by a compliance sheet — or covered by a bespoke design from a competent designer. Anything unusual in height, loading, sheeting, cantilevers or ties falls outside TG20 and needs the design.
Before first use, at intervals not exceeding seven days while it remains in place, and after any event likely to have affected its strength or stability such as high winds or an impact. The report is kept on site until the work is complete.
SG4 is NASC's guidance on preventing falls during scaffolding operations — the safe-zone method, advance guardrails and harness use for scaffolders themselves. Clients ask for it because it is the only part of the submission that addresses the people at the highest risk on the job.
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Riskora is an assistive document preparation tool. All documents generated must be reviewed, verified, and approved by a competent person before use on site. Riskora does not replace professional safety judgment, and no output should be treated as a legal compliance guarantee.