The construction industry is a major contributor to the UK economy, but this comes at a cost. Each year of the 400 million tonnes of solid materials used, only two-thirds is added to the building stock - the rest is consigned to landfill. Government is also concerned about the small but increasing amount of construction waste that is illegally dumped or fly-tipped. As waste controls tighten there is an increased risk of companies inadvertently employing illegal waste operatives.