Przedsiębiorstwo Budowlano-Melioracyjne „Tolos” Piotr Walczak i wspólnicy sp.k. has been a Polish costruction company since 1997 that operate nationally and internationally. It offers a wide range of services in the fields of geotechnics, water and sanitary enginereeng, as well as railway constructions.

The company specializes in comprehensive protection of deep excavations carried out by driving steel sheet piles, steel sections and making Berlin walls in various technologies. The company has modern and specialized equipment, qualified Staff and educated engineering Staff to implement the most demanding projects. The scope of works includes broadly understood geotechnics, water construction, drainage works, construction od sanitary and rainwater drainage systems, microtunneling, subsoil drainage, as well as road and railway construction works.