SIG plc is a Sheffield-headquartered British construction supply company operating across the United Kingdom and mainland Europe. Founded in 1957, the business specialises in the distribution of insulation, roofing, and interior building products used in residential, commercial, and industrial construction projects. The company operates through multiple divisions, including interiors and exteriors, providing solutions such as thermal insulation, dry lining systems, ceiling products, and roofing materials. SIG serves a broad customer base of contractors, housebuilders, and specialist installers, positioning itself as a key intermediary within the construction supply chain. With hundreds of branches across several European markets, the group combines local expertise with a wide product portfolio to support both new build and repair, maintenance, and improvement sectors. Listed on the London Stock Exchange, SIG plc continues to focus on sustainable building solutions, operational efficiency, and strengthening its role in energy-efficient construction.