Precast Concrete Floors & Stairs. Established in 1972, Coltman is now one of Britain's largest independent suppliers of precast concrete products to the construction industry. Our service is complete and covers each and every aspect of precast concrete products, from design, manufacturing and testing, through to installation on site. As an independent company we have enjoyed planned, consistent growth and have built up an enviable reputation for the quality of our products and excellent relationships with our customers. These include the country's leading names in architecture, construction, civil engineering and property development. We've also been involved in many prestigious projects from multi-million pound city redevelopments to quality civic cultural centres to premier sports arenas and stadiums. As part of our ongoing development we are now registered for Quality Administration and Environmental Management systems, standards and guidelines, BS EB ISO9001:2000 and BS EN ISO 14001:1996 respectively.