Industry code 43.223 · Oslo
Ventilation installation in Oslo
There are 57 active companies in ventilation installation in Oslo. 4 of them were registered in the last 12 months. Together they have 2,380 registered employees. The largest company is Gk Norge AS with 1,845 employees. The oldest, Automatikk Montasje AS, was founded in 1982. 77% are limited companies.
- Active companies
- 57
- New in the last 12 months
- 4
- Registered employees
- 2,380
- Share of limited companies
- 77 %
The largest companies in ventilation installation in Oslo
Sorted by number of employees. Figures are from the Register of Legal Entities and the Register of Company Accounts.
| # | Company | Org. no. | Employees | Revenue | Founded |
|---|---|---|---|---|---|
| 1 | Gk Norge AS | 915892981 | 1,845 | NOK 4.8 bn | 2015 |
| 2 | Randem & Hübert AS | 989653245 | 129 | NOK 560.3 m | 2006 |
| 3 | Haaland Klima AS | 986897526 | 97 | NOK 426.6 m | 2004 |
| 4 | Klima Og Bygg AS | 988106542 | 64 | NOK 244.5 m | 2005 |
| 5 | Bjerke Ventilasjon AS | 986887768 | 58 | – | 2004 |
| 6 | Gk Gruppen AS | 817431232 | 49 | NOK 250.4 m | 2016 |
| 7 | Luftkvalitet AS | 947022148 | 25 | NOK 46.2 m | 1988 |
| 8 | Gupex AS | 943705879 | 17 | NOK 73 m | 1987 |
| 9 | Ing S D Baastad AS | 836946162 | 16 | NOK 33.2 m | 1985 |
| 10 | Proterm AS | 997299175 | 16 | NOK 55.4 m | 2011 |
| 11 | Lid Ventilasjon AS | 977482933 | 14 | NOK 45.7 m | 1997 |
| 12 | Kr Montasje AS | 925230227 | 10 | NOK 9.7 m | 2020 |
| 13 | Ventilasjonsrens AS | 971089121 | 7 | NOK 10.8 m | 1994 |
| 14 | B S Teknikk AS | 840530752 | 6 | NOK 23.2 m | 1986 |
| 15 | Automatikk Montasje AS | 933144178 | 6 | NOK 12.1 m | 1982 |
| 16 | Beslag Og Firkant Expressen AS | 936343295 | 6 | NOK 1.1 m | 2025 |
| 17 | Viken Klima AS | 922724415 | 5 | NOK 7 m | 2019 |
| 18 | Elgh Ventilasjon Og Service AS | 933118975 | 5 | NOK 3.2 m | 2024 |
| 19 | Kvs Ventilasjon AS | 995635720 | 5 | NOK 3.9 m | 2010 |
| 20 | Mivent AS | 823242522 | – | NOK 2.8 m | 2019 |
| 21 | Bliks Holding AS | 832391972 | – | NOK 0 | 2023 |
| 22 | Arbos Partners AS | 876777762 | – | – | 1996 |
| 23 | Airmaster Norge AS | 913056892 | – | NOK 25.9 m | 2013 |
| 24 | Alfateamoslo AS | 920640672 | – | NOK 3.6 m | 2017 |
| 25 | Halvor Aarnes | 921551320 | – | – | – |
Newest companies in ventilation installation in Oslo
- Ljungberg Ventilasjon2 Aug 2026
- Drift Ventilasjon Tangerud12 Jun 2026
- Klarluft AS3 Mar 2026
- Balansert Ventilasjon Oslo AS26 Jan 2026
- Ventilasjonstek AS24 Oct 2025
- Beslag Og Firkant Expressen AS9 Oct 2025
- Michal Zamojta Ventilasjon31 Jul 2025
- Montvent AS14 Jun 2025
- Galics Ventilasjons Service26 May 2025
- Aircontrol AS13 Feb 2025
Frequently asked questions
How many companies in ventilation installation are there in Oslo?
The Register of Legal Entities lists 57 active companies in ventilation installation in Oslo. 4 of them were registered in the last 12 months.
Which is the largest company in ventilation installation in Oslo?
Gk Norge AS is the largest by number of employees, with 1,845 employees. The organisation number is 915892981.
How many people work in ventilation installation in Oslo?
The companies have 2,380 registered employees in total. The figures are based on employee counts in the Register of Legal Entities, and 19 of the 25 largest companies have reported employees.
How long have there been companies in ventilation installation in Oslo?
The oldest active company, Automatikk Montasje AS, was founded in 1982. 77% of the companies are limited companies.
Source: the Register of Legal Entities and the Register of Company Accounts. The overview shows active companies registered in the municipality with industry code 43.223. Figures are updated continuously.