Businesses in the asbestos category help identify, assess and manage asbestos-containing materials in buildings. Services may include asbestos surveys before refurbishment or demolition, sampling and laboratory analysis, risk assessments, and advice on whether materials should be left undisturbed, enclosed, repaired or removed. Surveyors inspect relevant areas and record the location, condition and type of suspected materials so property owners and contractors can plan work safely. Where removal is required, contractors may undertake asbestos removal, containment, cleaning and disposal of waste at authorised facilities. The work and controls depend on the material and level of risk: some higher-risk activities must be carried out by contractors licensed by the Health and Safety Executive, while other work is subject to specific safety requirements.