Building Testing Ltd (BTL) - Inspection and Testing Engineers; accredited, independent, professional, cost effective and expedient consultancy, inspection & testing service to the building, construction and consumer product industries. BTL are UKAS accredited for laboratory testing & site testing. BTL specialist areas include: Access floor air tightness testing, access floor panel testing, air tightness testing for Building Regulations Part L, consumer product testing, crowd control barrier & traffic barrier testing & building forensics. BTL have dedicated laboratory test facilities for access floors, barriers, construction & consumer products. BTL have dedicated site testing equipment provided for evaluation of access floors, air tightness of plenums & compartments, load bearing capacity, water tightness of facades.