This subclass includes:
- generation of electricity by all means including thermal, nuclear, hydroelectric, gas turbine, diesel and renewables (including generation by industrial, transport, etc. undertakings), where separately identifiable.

This subclass includes:
- transmission, distribution and supply of electricity

This subclass excludes:
- retailing of appliances in electricity showrooms cf. 52.45

This class includes:
- transportation, distribution and supply of gaseous fuels of all kinds through a system of mains
- manufacture of gaseous fuels with a specified calorific value, by purification, blending and other processes from gases of various types
- production of gas for the purpose of gas supply by carbonation of coal, from by-products of agriculture or from waste

This class excludes:
- operation of coke ovens cf. 23.10
- manufacture of refined petroleum products cf. 23.20
- manufacture of technical gases cf. 24.11
- retailing of appliances in gas showrooms cf. 52.44
- transportation of gases by pipelines (other than mains) cf. 60.30

This class includes:
- production, collection and distribution of steam and hot water for heating, power and other purposes

This class also includes:
- production and distribution of chilled water for cooling purposes

This class includes:
- collection, purification and distribution of water
- desalting of sea water to produce water as the principal product of interest

This class excludes:
- irrigation system operation for agricultural purposes cf. 01.41
- treatment of waste water solely in order to prevent pollution cf. 90.00

This division includes:
- new construction, restoration and ordinary repair

This class includes:
- demolition or wrecking of buildings and other structures
- clearing of building sites
- earthmoving: excavation, landfill, levelling and grading of construction sites, trench digging, rock removal, blasting, etc.
- site preparation for mining: overburden removal and other development and preparation of mineral properties and sites

This class also includes:
- building site drainage
- drainage of agricultural or forestry land

This class includes:
- test drilling, test boring and core sampling for construction, geophysical, geological or any other similar purpose

This class excludes:
- drilling of production oil or gas wells cf. 11.20
- test drilling and boring incidental to petroleum and gas extraction cf. 11.20
- shaft sinking cf. 45.25
- water well drilling cf. 45.25
- oil and gas field exploration, geophysical, geological and seismic surveying cf. 74.20/6

This subclass includes:
- assembly and erection of prefabricated commercial buildings on the site

This subclass excludes:
- erection of complete prefabricated constructions from self- manufactured parts not of concrete cf. divisions 20, 26 and 28
- construction work other than of buildings for stadiums, swimming pools, gymnasiums, tennis courts, golf courses and other sports installations cf. 45.23
- building installation cf. 45.3
- building completion cf. 45.4
- architectural and engineering activities cf. 74.20
- project management for construction cf. 74.20

This subclass also includes:
- assembly and erection of prefabricated domestic buildings on the site

This subclass excludes:
- erection of complete prefabricated constructions from self-manufactured parts not of concrete cf. Divisions 20, 26 and 28
- building installations cf. 45.3
- building completion cf. 45.4
- architectural and engineering activities cf. 74.20
- project management for construction cf. 74.20

This subclass includes:
- construction of civil engineering constructions:
. bridges, including those for elevated highways, viaducts, tunnels and subways
. long distance pipelines, communication and power lines
. urban pipelines, urban communication and power lines; ancillary urban work
- assembly and erection of prefabricated civil engineering constructions on the site

This subclass excludes:
- service activities incidental to oil and gas extraction cf. 11.20
- erection of complete prefabricated constructions from self-manufactured parts not of concrete cf. Divisions 20, 26 and 28
- architectural and engineering activities cf. 74.20
- project management for construction cf. 74.20

This class includes:
- erection of roofs
- roof covering
- waterproofing

This class includes:
- construction of highways, streets, roads, other vehicular and pedestrian ways
- construction of railways
- construction of airfield runways
- construction work other than of buildings for stadiums, swimming pools, gymnasiums, tennis courts, golf courses and other sports installations
- painting of markings on road surfaces and parking lots

This class excludes:
- preliminary earth moving cf. 45.11

This class includes:
- construction of:
. waterways, harbour and river works, pleasure ports (marinas), locks, etc.
. dams and dykes
- dredging
- sub-surface work

This class includes:
- construction activities specialising in one aspect common to different kinds of structures, requiring specialised skills or equipment:
. construction of foundations, including pile driving
. water well drilling and construction, shaft sinking
. erection of not self-manufactured steel elements
. steel bending
. brick laying and stone setting
. scaffolds and work platform erecting and dismantling, including renting of scaffolds and work platforms
. erection of chimneys and industrial ovens

This class excludes:
- renting of scaffolds without erection and dismantling cf. 71.32

This class includes:
- installation in buildings or other construction projects of:
. electrical wiring and fittings
. telecommunication systems
. electrical heating systems
. lifts and escalators
. fire alarms
. burglar alarm systems
. residential antennas and aerials
. lightning conductors, etc.

This class includes:
- installation in buildings or other construction projects of thermal, sound or vibration insulation

This class excludes:
- waterproofing cf. 45.22

This class includes:
- installation in buildings or other construction projects of:
. plumbing and sanitary equipment
. gas fittings
. heating, ventilation, refrigeration or air conditioning equipment and ducts
. sprinkler systems

This class excludes:
- installation of electrical heating systems cf. 45.31

This class includes:
- installation of illumination and signalling systems for roads, railways, airports and harbours
- installation in buildings or other construction projects of fittings and fixtures not elsewhere classified

This class includes:
- application in buildings or other construction projects of interior and exterior plaster or stucco including related lathing materials

This class includes:
- installation of not self-manufactured doors, windows, door and window frames, fitted kitchens, staircases, shop fittings and the like, of wood or other materials
- interior completion such as ceilings, wooden wall coverings, movable partitions, etc.

This class excludes:
- laying of parquet and other wood floor coverings cf. 45.43

This class includes:
- laying, tiling, hanging or fitting in buildings or other construction projects of:
. ceramic, concrete or cut stone wall or floor tiles
. parquet and other wood floor coverings
. carpets and linoleum floor coverings including of rubber or plastic
. terrazzo, marble, granite or slate floor or wall coverings
. wallpaper

This class includes:
- interior and exterior painting of buildings
- painting of civil engineering structures
- installation of glass, mirrors, etc.

This class excludes:
- installation of windows cf. 45.42

This class includes:
- installation of private swimming pools
- steam cleaning, sandblasting and similar activities for building exteriors
- other building completion and finishing work not elsewhere classified

This class excludes:
- interior cleaning of buildings and other structures cf. 74.70

This class excludes:
- renting of construction or demolition machinery and equipment without operators cf. 71.32