Do I Need a COSHH Assessment?

What Is COSHH?

COSHH stands for Control of Substances Hazardous to Health. The COSHH Regulations 2002 require employers (and self-employed people) to assess and control exposure to hazardous substances in the workplace.

Common Hazardous Substances in Construction

• Cement/concrete: Causes dermatitis and burns (chromium VI)
• Silica dust: From cutting concrete, stone, brick (causes silicosis)
• Wood dust: Hardwood dust is a known carcinogen
• Solvents: In paints, adhesives, sealants, cleaning products
• Epoxy resins: Sensitiser — can cause severe allergic reactions
• Asbestos: Separate regulations (CAR 2012) but also under COSHH
• Lead paint: Common in pre-1960s buildings
• Isocyanates: In spray foam insulation, spray paints

What Must a COSHH Assessment Include?

1. Identify hazardous substances used or created by the work
2. Assess the risk of exposure (who, how, how much)
3. Control exposure (elimination, substitution, engineering controls, PPE)
4. Monitor exposure where required
5. Health surveillance where appropriate
6. Record findings and review regularly

Who Needs One?

• Employers: Must assess for all employees
• Self-employed: Must assess for themselves and anyone affected by their work
• Even sole traders working with hazardous substances need COSHH assessments

Last updated: April 2026. This is general guidance only and does not constitute legal or health and safety advice. COSHH assessments should be carried out by a competent person. Refer to HSE guidance INDG136 for the step-by-step process.