Byggessen Entreprenad AB is a construction company based in Västerås, founded in 1995 by Thomas Sahlin and Ulf Synnes, who are still active owners. Their business concept is that they should be a quality-certified construction company that runs large and small projects throughout Central Sweden for corporate customers in the private and public sectors. Their vision is that Byggessen will be a player who has great confidence in customers, suppliers, employees and other stakeholders and grows with control within the market they operate.

Their core business is to carry out contracts and service work for corporate customers, primarily in industry, offices and commerce. They carry out all types of new, rebuilding and extension works with good knowledge and experience of both cast, steel and prefabricated frames and contractions with reference projects of between SEK 50–100 million. Another major part of the company's operations is the restructuring of stores in cooperation with Coop, ICA, Lidl and other players in the trading area. In addition, they have a service organization with good knowledge and experience to manage smaller office renovations and renovations.