41.20.Z - Construction work related to the construction of residential and non-residential buildings
43.11.Z - Demolition and destruction of buildings
43.12.Z - Site preparation for construction
43.21.Z - Installation of electrical systems
43.22.Z - Installation of plumbing, heating, and air-conditioning systems
43.99.Z - Other specialized construction works, not classified elsewhere
61.10.Z - Activities in the field of wired, wireless, and satellite telecommunications
80.10.Z - Detective and security activities
81.10.Z - Auxiliary activities related to maintaining buildings
81.21.Z - General cleaning of buildings