 By the end of the 1920s, there were three timber yards (two of them Jewish owned, one government owned), three plywood factories (Jewish owned), two furniture factories, two glass factories, two agriculture machinery works, three flour mills (two Jewish owned), two oil presses, four tar and turpentine factories and a brick factory operating in Kostopol.In nearby Janowa Dolina, there were granite and basalt quarries, with railway links to Kostopol station.The Polish government built a housing projects for the quarry workers.