Unauthorised alteration of scaffolding is one of the most common and most dangerous practices on UK construction sites. Removing guardrails, boards, ties, or bracing to allow access, pass materials, or accommodate other trades compromises the structural integrity of the entire scaffold. A single removed tie can trigger a scaffold collapse. Only qualified scaffolders may alter any scaffold component, and the scaffold must be re-inspected and re-tagged after any modification before it can be used again.
Key Hazards
Scaffold collapse from ties, bracing, or standards removed without engineering assessment
Falls from scaffold platforms where guardrails or boards have been removed by users
Materials falling through gaps where toe boards or platform boards have been taken out
Full scaffold failure from a cascade of alterations each weakening the structure incrementally
Control Measures
Never remove, loosen, or adjust any scaffold component including boards, guardrails, ties, or bracing.
Report any scaffold component that needs to be altered to your supervisor immediately.
Request the scaffolding contractor to carry out any necessary modifications through the formal process.
Ensure the scaffold is re-inspected and re-tagged by a competent person after any alteration.
Treat any scaffold with missing or displaced components as unsafe and do not use it.
Understand that a single removed tie can destabilise the entire scaffold structure.
Brief all trades using the scaffold that alteration by anyone other than a qualified scaffolder is prohibited.
Report anyone you see removing or altering scaffold components to the site supervisor immediately.
Check the scaffold tag and visually inspect for missing components before stepping onto any scaffold.
Remember
Removing a single scaffold tie, guardrail, or board can cause the entire scaffold to collapse.
Only a qualified CISRS scaffolder may alter any component of any scaffold on the site.
If a component needs to be moved for your trade access, request a formal scaffold modification.
After any modification, the scaffold must be re-inspected and the tag updated before use.
Treating a scaffold as something you can adjust to suit your task is dangerous and prohibited.
If you see missing components or someone altering a scaffold, report it immediately and do not use it.
Applicable Legislation: Work at Height Regulations 2005 · NASC SG4 (Preventing Falls in Scaffolding) · CDM Regulations 2015 · BS EN 12811