Scaffold Safety Guide
A plain-English guide to UK scaffold inspection, tie testing and compliance for contractors, principal contractors and site managers.
Scaffold safety in the UK is governed by the Work at Height Regulations 2005 and supported by NASC technical guidance. This guide summarises the inspection and testing duties that keep a scaffold compliant, safe to use, and defensible in the event of an incident. It is written for site teams who need a quick, reliable reference rather than a legal document, and is kept up to date as guidance changes. For site-specific advice, always engage a competent, independent inspector.
When must scaffolding be inspected?
Under the Work at Height Regulations 2005, a scaffold must be inspected by a competent person before it is first used, and then at least every seven days while it remains erected. An inspection is also required after any event likely to have affected its strength or stability — strong winds, heavy snow, a vehicle impact, or any significant alteration to the structure. Each inspection must be recorded, and the report kept on site for the duration of the works. Missing or late inspections are one of the most common causes of enforcement action by the HSE and can invalidate a contractor's insurance position.
Tie and anchor testing
Every scaffold tie relies on the integrity of the anchor fixing into the host structure. Scaffold anchors drilled into concrete or masonry must be proof-loaded by pull testing to verify they hold the design resistance before the scaffold is loaded. Testing is carried out in line with BS EN 795 and NASC guidance (TG4), with results recorded for each anchor location. Without test evidence, there is no proof that a tie will perform under load — and an unverified tie is treated as an absent tie. Independent anchor testing removes any doubt and gives the principal contractor a defensible paper trail.
Common defects found during inspections
Typical defects include missing or loose bracing, incorrect transom spacing, guard-rails below the 950mm minimum, inadequate toe-boards, unguarded gaps, overloaded bays, and ties that have been removed or never installed. Soft ground, damaged scaffold boards, and unsecured ladders are further high-frequency findings. A competent independent inspector will document each defect with a clear photograph, grade its risk, and issue a written report so the scaffolder can rectify before the scaffold is handed back for use.
Quick Safety Tips
Inspect before first use, every time
A scaffold with no inspection report on site is treated as unfit for use. Have a competent person inspect and record before anyone steps on it.
Record anchor pull tests for every fixing
Scaffold anchor pull tests give proof that each fixing holds its design resistance. Keep the test record with the scaffold handover paperwork.
Keep ties in — never remove without rechecking
Removing a tie to sheet or clad a scaffold weakens the structure. Any tie removed must be replaced and the scaffold re-inspected.
Guard-rails must be at least 950mm high
The top guard-rail of a working scaffold must be at least 950mm above the working platform, with an intermediate rail or barrier to prevent falls.
