Site Waste Management Plans | SWMP Waste Plan Solutions Site Waste Management Plans (SWMP) became a legal requirement on 6th April 2008 for all construction projects over £300,000. Site Waste Management Plans require the contractor to forecast your waste amounts, and if your project is valued over £500,000 to measure the actual waste arisings on site. Wasteplansolutions.co.uk~Site InfoWhoisTrace RouteRBL Check