| 83569 | Ultrasonic testing of machine parts | |
| 83569 | Ultrasonic testing of structures | |
| 97290 | Ultraviolet rays, non-therapeutic treatment with | |
| 96620 | Umpires, services of | |
| 67530 | Uncovered car-parks, services of | |
| 67530 | Uncovered parking, services of | |
| 87141 | Undercoating of motor vehicles | |
| 85210 | Undercover investigation services | |
| 54252 | Underground cable television lines, general construction of | |
| 83391 | Undertaking contamination studies of agricultural buildings | |
| 83392 | Undertaking contamination studies of airfield runways | |
| 83392 | Undertaking contamination studies of bridges | |
| 83393 | Undertaking contamination studies of chemical and related facilities | |
| 83392 | Undertaking contamination studies of civil engineering works | |
| 83391 | Undertaking contamination studies of commercial buildings | |
| 83392 | Undertaking contamination studies of dams | |
| 83392 | Undertaking contamination studies of elevated highways | |
| 83392 | Undertaking contamination studies of harbours | |
| 83392 | Undertaking contamination studies of highways | |
| 83391 | Undertaking contamination studies of industrial buildings | |
| 83393 | Undertaking contamination studies of industrial plant and processes | |
| 83392 | Undertaking contamination studies of irrigation works | |
| 83392 | Undertaking contamination studies of local cables and related works | |
| 83392 | Undertaking contamination studies of local pipelines and related works | |
| 83392 | Undertaking contamination studies of long-distance communication lines | |
| 83392 | Undertaking contamination studies of long-distance pipelines | |
| 83392 | Undertaking contamination studies of long-distance power lines (cables) | |
| 83393 | Undertaking contamination studies of manufacturing constructions | |
| 83393 | Undertaking contamination studies of mining constructions | |
| 83391 | Undertaking contamination studies of non-residential buildings | |
| 83399 | Undertaking contamination studies of other construction projects | |
| 83392 | Undertaking contamination studies of outdoor recreation facilities | |
| 83392 | Undertaking contamination studies of outdoor sport facilities | |
| 83393 | Undertaking contamination studies of power plants | |
| 83392 | Undertaking contamination studies of railways | |
| 83391 | Undertaking contamination studies of residential buildings | |
| 83392 | Undertaking contamination studies of roads | |
| 83392 | Undertaking contamination studies of streets | |
| 83392 | Undertaking contamination studies of subways | |
| 83393 | Undertaking contamination studies of the automation of industrial processes | |