Industry code 43.22 · Oslo
Plumbing, heat and air-conditioning installation in Oslo
There are 649 active companies in plumbing, heat and air-conditioning installation in Oslo. 55 of them were registered in the last 12 months. Together they have 5,585 registered employees. The largest company is Gk Norge AS with 1,845 employees. The oldest, AS Rørlegger, was founded in 1925. 75% are limited companies.
- Active companies
- 649
- New in the last 12 months
- 55
- Registered employees
- 5,585
- Share of limited companies
- 75 %
The largest companies in plumbing, heat and air-conditioning 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 | Assemblin AS | 965808752 | 670 | NOK 1.7 bn | 1992 |
| 3 | Therma Industri AS | 991863796 | 134 | NOK 439.3 m | 2007 |
| 4 | Rør System AS | 996754316 | 134 | NOK 117.9 m | 2011 |
| 5 | Randem & Hübert AS | 989653245 | 129 | NOK 560.3 m | 2006 |
| 6 | Co2oltec Commercial Refrigeration Norway AS | 981495977 | 100 | NOK 475.8 m | 2000 |
| 7 | Haaland Klima AS | 986897526 | 97 | NOK 426.6 m | 2004 |
| 8 | Brattås AS | 980334511 | 90 | NOK 142 m | 1998 |
| 9 | Christiania Rørleggerbedrift AS | 912069370 | 88 | NOK 169.3 m | 2013 |
| 10 | Vvs Kontakten AS | 922531897 | 85 | NOK 158.1 m | 2019 |
| 11 | Elite Ventilasjon AS | 922432007 | 79 | NOK 95.4 m | 2019 |
| 12 | Oslo-Akershus Rørleggerbedrift AS | 994920790 | 70 | NOK 159.5 m | 2009 |
| 13 | Andenæs Vvs AS | 963031130 | 67 | NOK 137.6 m | 1991 |
| 14 | Klima Og Bygg AS | 988106542 | 64 | NOK 244.5 m | 2005 |
| 15 | Østlandske Vvs AS | 984235763 | 62 | NOK 89.8 m | 2002 |
| 16 | Bjerke Ventilasjon AS | 986887768 | 58 | – | 2004 |
| 17 | Eptec Energi AS | 957492258 | 50 | NOK 197 m | 1990 |
| 18 | C M Mathiesen & Co AS | 960007247 | 50 | NOK 47.8 m | 1991 |
| 19 | Gk Gruppen AS | 817431232 | 49 | NOK 250.4 m | 2016 |
| 20 | Eriksen & Jensen AS | 940266009 | 46 | NOK 61.3 m | 1986 |
| 21 | Oslo Vvs Service AS | 957810950 | 45 | NOK 113.7 m | 1990 |
| 22 | Coolteam AS | 988373354 | 45 | – | 2005 |
| 23 | Voler AS | 926113682 | 43 | NOK 61.7 m | 2020 |
| 24 | Total Vvs AS | 997275160 | 43 | – | 2011 |
| 25 | Trygg Vvs AS | 998380448 | 38 | NOK 90.7 m | 2012 |
Newest companies in plumbing, heat and air-conditioning installation in Oslo
- Rørværk AS4 Nov 2026
- Kinunda Vvs15 Oct 2026
- Rør System Ii AS2 Oct 2026
- Gamle Oslo Vvs AS30 Sept 2026
- Rørklar Varberg14 Sept 2026
- Abdo Rørservice4 Sept 2026
- Postmaker AS1 Sept 2026
- Bw Vvs & Bygg AS26 Aug 2026
- Solid Rørservice AS14 Aug 2026
- Ljungberg Ventilasjon2 Aug 2026
Frequently asked questions
How many companies in plumbing, heat and air-conditioning installation are there in Oslo?
The Register of Legal Entities lists 649 active companies in plumbing, heat and air-conditioning installation in Oslo. 55 of them were registered in the last 12 months.
Which is the largest company in plumbing, heat and air-conditioning 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 plumbing, heat and air-conditioning installation in Oslo?
The companies have 5,585 registered employees in total. The figures are based on employee counts in the Register of Legal Entities, and 25 of the 25 largest companies have reported employees.
How long have there been companies in plumbing, heat and air-conditioning installation in Oslo?
The oldest active company, AS Rørlegger, was founded in 1925. 75% of the companies are limited companies.
Explore further
Other industries in the same group in Oslo
Source: the Register of Legal Entities and the Register of Company Accounts. The overview shows active companies registered in the municipality with industry code 43.22. Figures are updated continuously.