The subject of the project is the modernisation of five residential buildings, which are part of the Osada working estate after the former cellulose and paper factory in the Tysk District of Czułów. In buildings on the street. Katowice 207, 209, 233, 235 and 237 have a total of 54 social housing units. The scope of the project is similar in all buildings and covers the following types of works: — warming of external walls and ceilings, – replacement of window and door carpentry, – internal gas installation including installation of gas boilers, condensation, dual function, – replacement of central heating and hot water installations, – replacement of electrical installations with replacement of lighting of common parts, – repair works. The project will increase the energy efficiency of buildings by 64.68 %, reduce CO2 by 78.65 % (236.30 t/year) and reduce PM10 dust by 99.94 % (0.90373 t/year). The project concerns two types of projects authorised under measure 4.3. IT’S THE RPO.