| JV Anlegg AS | Borgenhaugen | 2013 |
| JV Demolering AS | Trondheim | 2010 |
| JV Drift AS | Lom | 2026 |
| JV Entreprenør AS | Drangedal | 2022 |
| JV Holding AS | Borgenhaugen | 2022 |
| JV Implenia Stangeland E39 Lyngdal Ans | Lysaker | 2021 |
| JV Implenia Stangeland E39 Rogfast Ans | Lysaker | 2023 |
| JV Implenia Stangeland E39 Rogfast E02 Ans | Lysaker | 2024 |
| JV Sandblåst AS | Eide | 2026 |
| JV Stangeland - B&G Tunnel Ans | Egersund | 2022 |
| Jva Entreprenør AS | Fredrikstad | 2023 |
| Jvmt AS | Sandefjord | 2022 |
| JVP Holding AS | Halden | 2020 |
| JVS Bygg AS | Trondheim | 2026 |
| JVZ Kvalitet AS | Notodden | 2019 |
| JW Brunnsborrning AB | Se-855 92 Kovland | 2021 |
| JW Bygg AS | Bergen | 1998 |
| JWG Bygg AS | Paradis | 2026 |
| Jydsk Rørentreprise AS | Son | 1998 |
| Jyn Holding AS | Oslo | 2018 |
| Jysk Elteknik | Dk-7700 Thisted | 2013 |
| Jysk Industrimontage Norge Nuf | Sandnes | 2013 |
| Jens Tore Bø A/S | Stryn | 1987 |
| Jåki Vaktmester AS | Yven | 2025 |
| Jåsund Bygg AS | Tananger | 2026 |
| Jægervatnet AS | Svensby | 2010 |
| Jær Tre AS | Varhaug | 2016 |
| Jærblikk AS | Nærbø | 2018 |
| Jærbygg AS | Bryne | 2020 |
| Jære Alt AS | Oppdal | 2019 |
| Jæren Agri AS | Bryne | 2024 |
| Jæren Betong&Saging AS | Orre | 2024 |
| Jæren Bygg & Anleggsservice AS | Vigrestad | 2021 |
| Jæren Flis & Skifer AS | Orre | 2001 |
| Jæren Graveservice AS | Kleppe | 2015 |
| Jæren Gulv AS | Bryne | 2009 |
| Jæren Isolering AS | Tananger | 2023 |
| Jæren Kulde AS | Sandnes | 2014 |
| Jæren Maling AS | Bryne | 2026 |
| Jæren Maskin AS | Orre | 2019 |
| Jæren Multi Service AS | Stavanger | 2026 |
| Jæren Multiservice AS | Sandnes | 2026 |
| Jæren Støyp Og Forskaling AS | Hommersåk | 2026 |
| Jæren Varmepumpeservice AS | Sola | 2023 |
| Jæren VVS AS | Sandnes | 2023 |
| Jærentreprenør Anlegg AS | Bryne | 2022 |
| Jærentreprenør AS | Bryne | 2010 |
| Jærmester AS | Varhaug | 1997 |
| Jærmur AS | Varhaug | 2005 |
| Jærmur Holding AS | Varhaug | 2024 |
| Jærprosjekt AS | Sandnes | 2023 |
| Jærstil AS | Sandnes | 2025 |
| Józef Opiela | Roa | 2005 |
| Jöst GmbH & Co KG | 48249 Dülmen | 2011 |
| Jø Holding AS | Østerås | 2013 |
| Jø-Bygg AS | Jøa | 2005 |
| Jøa AS | Asker | 2007 |
| Jødahl Entreprenør AS | Sørumsand | 1994 |
| Jødahl Maskin AS | Sørumsand | 2014 |
| Jødahl Takst Og Bygg AS | Kløfta | 2021 |
| Jølle & Kristensen AS | Trondheim | 2016 |
| Jølle & Kristensen Holding AS | Trondheim | 2024 |
| Jølstad Maskin AS | Fagerstrand | 2022 |
| Jølster Betongbygg AS | Vassenden | 2000 |
| Jømio AS | Gjøvik | 2021 |
| Jønsberg Inneklima AS | Rognan | 2024 |
| Jønsberg Ventilasjon AS | Rognan | 2015 |
| Jøra Bygg AS | Follebu | 1989 |
| Jøra Bygg Hus Og Hytter AS | Follebu | 2024 |
| Jøraas Drift AS | Løken | 2019 |
| Jørgen Edkvist Service AB | Askim | 2011 |
| Jørgen Ettestøl AS | Vegårshei | 2020 |
| Jørgen Flesvik AS | Nesbyen | 2010 |
| Jørgen Hjertkvist Byggservice | Filtvet | 1998 |
| Jørgen Jeppesens Eftf. Aps | Dk-9850 Hirtshals | 2014 |
| Jørgen Karstensen AS | Sellebakk | 2010 |
| Jørgen Lervik AS | Oslo | 2022 |
| Jørgen Opdahl Asperud Installasjon AS | Kråkstad | 2003 |
| Jørgen På Jordet AS | Asker | 2017 |
| Jørgen Sjølie Holding AS | Ål | 2017 |
| Jørgen Sletholen AS | Sørum | 2001 |
| Jørgen Ullern Bygg & Anlegg AS | Røyse | 2021 |
| Jørgensen & Askedal Bygg AS | Øvrebø | 2025 |
| Jørgensen & Nilsen Flis Ans | Tjøme | 1998 |
| Jørgensen AS | Oslo | 2023 |
| Jørgensen Bygg AS | Sokna | 1996 |
| Jørgensen Bygg Og Innredning AS | Sauda | 2019 |
| Jørgensen Byggelag AS | Selbu | 2006 |
| Jørgensen Invest AS | Beisfjord | 2005 |
| Jørgensen Malerservice Grimstad AS | Grimstad | 2020 |
| Jørgensen Og Jørgensen AS | Torp | 2023 |
| Jørgensen Og Jørgensen Holding AS | Torp | 2023 |
| Jørgensen Total Entreprise Aps | Dk-9500 Hobro | 2015 |
| Jørn Konrad Bye AS | Krøderen | 2012 |
| Jørn Nordkvelde AS | Larvik | 1998 |
| Jørn Og Rune Gruppen AS | Drammen | 2005 |
| Jørn Storberget AS | Lierskogen | 2012 |
| Jørns Malerservice AS | Hobøl | 2018 |
| Jørnsen Tak AS | Drammen | 1994 |
| Jørstad Tradisjonsbygg AS | Holmsbu | 2025 |