ELKOL Sp. z o.o.
performs comprehensive design services and executes works (railway traffic control systems, energy industry, telecommunication systems, track systems)
ELKOL Geodezja Sp. z o.o.
performs comprehensive surveying services for the railway industry
Przedsiębiorstwo Wodociągów i Kanalizacji Sp. z o.o.
performs design and construction works in the water and sewage industry (construction of drainage systems, sewage systems, fire safety systems, water systems, separators, ecological wastewater treatment systems, trenchless sewer repairs e.g. with the use of a UV-cured sleeve)