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| Serafin Byggservice AS | Nyborg | 2021 |
| Serene Modul Bygg AS | Langevåg | 2025 |
| Sergio Bygg AS | Kristiansand S | 2013 |
| Serigor SRL | Ro Ap. 2 Judet Suceava | 2020 |
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| Serle AS | Dal | 2020 |
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| Servcon AS | Horten | 2019 |
| Servetec Elektro AS | Hundeidvik | 2017 |
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| Service & Support AS | Steinkjer | 2023 |
| Service 7024 AS | Trondheim | 2020 |
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| Service BN Bygg AS | Trondheim | 2016 |
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| Service Gruppen AS | Lillestrøm | 2019 |
| Service Hansen AS | Greåker | 2025 |
| Service Nord | Dk-9760 Vraa | 2012 |
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| Service Og Montasje AS | Brumunddal | 2018 |
| Service Pro AS | Spydeberg | 2025 |
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| Service Rørlegger AS | Klavestadhaugen | 2023 |
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| Service-Partner Elite AS | Oslo | 2018 |
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| Setesdal Elektro AS | Bykle | 2005 |
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| Settevik Eiendom AS | Skui | 2012 |
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| Sevconstruction Nuf | Ee-68207 Valga | 2023 |
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| Seve Iceland Ehf | Is-104 Reykjavik | 2021 |
| Sever Steel OY Nuf | Fi-69100 Kannus | 2025 |
| Severfield Europe B.V. | 4761Ba Zevenbergen | 2023 |
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| SF Bygg AS | Stamsund | 2009 |
| Sf-Holding AS | Kristiansand S | 2010 |
| SFB Bygg Og Vedlikehold AS | Vestmarka | 2025 |
| SFH AS | Stonglandseidet | 2015 |
| Sfiber Entreprenør AS | Sandefjord | 2025 |
| SFP Klima AS | Nærbø | 2010 |
| SFT Holding AS | Tveit | 2023 |
| SG Bakke AS | Nesttun | 2025 |
| SG Bergboring AS | Vanse | 2018 |
| SG Bygg AS | Nordagutu | 2021 |
| SG Byggservice AS | Skjeberg | 2018 |
| SG Drift AS | Larvik | 2022 |