CPV: 45331000 Heating, ventilation and air-conditioning installation work, 45310000 Electrical installation work, 45330000 Plumbing and sanitary works, 45343000 Fire-prevention installation works, 45320000 Insulation work, 45332000 Plumbing and drain-laying work, 45333000 Gas-fitting installation work, 45300000 Building installation work

CPV: 42996000 Machinery for the treatment of sewage, 38420000 Instruments for measuring flow, level and pressure of liquids and gases, 38431100 Gas-detection apparatus, 39341000 Gas pressure equipment, 42123100 Gas compressors, 42124340 Parts of gas compressors, 42514320 Gas filters, 44161110 Gas-distribution network, 44612200 Gas tanks, 45231221 Gas supply mains construction work, 45231222 Gasholder works, 45255800 Gas-production plant construction work, 45333000 Gas-fitting installation work

CPV: 45333000 Gas-fitting installation work

CPV: 45331110 Boiler installation work, 45331100 Central-heating installation work, 45333000 Gas-fitting installation work

CPV: 45000000 Construction work, 45100000 Site preparation work, 45110000 Building demolition and wrecking work and earthmoving work, 45111000 Demolition, site preparation and clearance work, 45112000 Excavating and earthmoving work, 45200000 Works for complete or part construction and civil engineering work, 45210000 Building construction work, 45211000 Construction work for multi-dwelling buildings and individual houses, 45212000 Construction work for buildings relating to leisure, sports, culture, lodging and restaurants, 45342000 Erection of fencing, 45213000 Construction work for commercial buildings, warehouses and industrial buildings, buildings relating to transport, 45214000 Construction work for buildings relating to education and research, 45215000 Construction work for buildings relating to health and social services, for crematoriums and public conveniences, 45220000 Engineering works and construction works, 45221000 Construction work for bridges and tunnels, shafts and subways, 45223000 Structures construction work, 45230000 Construction work for pipelines, communication and power lines, for highways, roads, airfields and railways; flatwork, 45231000 Construction work for pipelines, communication and power lines, 45232000 Ancillary works for pipelines and cables, 45233000 Construction, foundation and surface works for highways, roads, 45235000 Construction work for airfields, runways and manoeuvring surfaces, 45236000 Flatwork, 45252000 Construction works for sewage treatment plants, purification plants and refuse incineration plants, 45259000 Repair and maintenance of plant, 45260000 Roof works and other special trade construction works, 45261000 Erection and related works of roof frames and coverings, 45262000 Special trade construction works other than roof works, 45300000 Building installation work, 45310000 Electrical installation work, 45311000 Electrical wiring and fitting work, 45312000 Alarm system and antenna installation work, 45313000 Lift and escalator installation work, 45314000 Installation of telecommunications equipment, 45315000 Electrical installation work of heating and other electrical building-equipment, 45316000 Installation work of illumination and signalling systems, 45321000 Thermal insulation work, 45317000 Other electrical installation work, 45320000 Insulation work, 45341000 Erection of railings, 45324000 Plasterboard works, 45330000 Plumbing and sanitary works, 45331000 Heating, ventilation and air-conditioning installation work, 45332000 Plumbing and drain-laying work, 45333000 Gas-fitting installation work, 45340000 Fencing, railing and safety equipment installation work, 45343000 Fire-prevention installation works, 45350000 Mechanical installations, 45351000 Mechanical engineering installation works, 45400000 Building completion work, 45410000 Plastering work, 45420000 Joinery and carpentry installation work, 45421000 Joinery work, 45430000 Floor and wall covering work, 45431000 Tiling work, 45432000 Floor-laying and covering, wall-covering and wall-papering work, 45440000 Painting and glazing work, 45441000 Glazing work, 45442000 Application work of protective coatings, 45443000 Facade work, 45450000 Other building completion work

CPV: 45333000 Gas-fitting installation work

CPV: 45317000 Other electrical installation work, 45333000 Gas-fitting installation work, 45333200 Gas meter installation work

CPV: 45333000 Gas-fitting installation work