The main body responsible for monitoring the environmental impact of demolition sites is the Health and Safety Executive (HSE). Some responsibility may also lie with the local authority (e.g. nuisance).
Waste producers have a responsibility under Duty of Care which is monitored by the Environment Agency. All wastes must go to appropriate sites that are permitted by the Environment Agency. The Environment Agency checks compliance at these sites. Much of the waste from demolition is not disposed of but re-used and recycled.