







| Situation | How Often to Assess |
|---|---|
| High-risk processes (e.g. welding, spraying, solvents) | Every 6 to 12 months |
| Low-risk environments (e.g. offices) | Every 1–3 years or when needed |
| COSHH-regulated substances | As specified by your COSHH risk assessment |
| After major changes (e.g. new machinery, materials, layout) | Immediately |
| Following complaints or incidents | Immediately |
| When control measures are installed or altered | Soon after installation, then regularly |