Installation work
Heating, ventilation and air conditioning work
Water plumbing and drain laying work
Gas fitting construction work
Electrical work
Electrical wiring and fitting work
Fire alarm construction work
Burglar alarm system construction work
Residential antenna construction work
Other electrical construction work
Insulation work (electrical wiring, water, heat, sound)
Fencing and railing construction work
Other installation work
Lift and escalator construction work
Other installation work n.e.c.