| Berkon AS | Straume | 2015 |
| Berland Bygg AS | Bergen | 1993 |
| Berland Byggservice AS | Kjerrgarden | 2021 |
| Berland Elektro AS | Kjerrgarden | 2020 |
| Berland Holding AS | Bergen | 2005 |
| Berlevåg Bygg AS | Berlevåg | 1991 |
| Berlevåg Maskin AS | Berlevåg | 2013 |
| Berlevåg Rør AS | Berlevåg | 2016 |
| Bermingrud Eiendomsservice AS | Vestfossen | 2025 |
| Bermingrud Invest AS | Vestfossen | 2021 |
| Bernad Renovering AS | Hakadal | 2026 |
| Bernard Bygg AS | Høvik | 2020 |
| Bernard Martinsen Elektro AS | Brønnøysund | 2000 |
| Berndorf Metall- Und Bäderbau Ges.M.B.H. | At-2560 Berndorf | 2013 |
| Bernes Anlegg AS | Lonevåg | 2018 |
| Bernhardt Bygg & Eiendom AS | Stavanger | 2024 |
| Bernhus Salg & Service AS | Ørje | 2023 |
| Bernt Bygg AS | Trondheim | 2011 |
| Bernt Dahl Byggtjenester AS | Spillum | 2021 |
| Bernt Dahl Holding AS | Spillum | 2021 |
| Bernt Frustøl Elektro AS | Brennåsen | 2008 |
| Bernt Gundersen Graveservice AS | Gjesåsen | 2000 |
| Bernt Haugmo AS | Bodø | 2012 |
| Bernt Mjølhus AS | Haugesund | 2025 |
| Bernth Fredriksson | 15337 Järna | 2011 |
| Bernts Glasmasteri Ans | Trondheim | 1998 |
| Bernts Glasmesteri HB | Oslo | 1998 |
| Berntsen & Berntsen Prosjekt AS | Hjellestad | 1995 |
| Berntsen Bygg AS | Sylling | 2014 |
| Berntsen Byggpartner AS | Fetsund | 2005 |
| Berntsen Byggservice AS | Kvaløya | 2025 |
| Berntsen Mur Og Fliseservice AS | Bjørøyhamn | 2000 |
| Berntsen Rør AS | Vega | 2002 |
| Berntzen Maskin AS | Sola | 2026 |
| Bero Ans | Høvik | 2001 |
| Bero Holding AS | Blomsterdalen | 2009 |
| Berre Elektro AS | Førde | 2020 |
| Berre Entreprenør AS | Spillum | 2022 |
| Bersagel Bygg AS | Ombo | 2015 |
| Bertel O. Steen Power Solutions Denmark A/S Nuf | Dk-2600 Glostrup | 2023 |
| Bertelsen & Garpestad AS | Egersund | 1986 |
| Bertelsen Bygg AS | Rotsund | 2015 |
| Berthelsen & Vu AS | Laksevåg | 2015 |
| Berthelsen Bygg AS | Søgne | 2020 |
| Bertheussen Holding AS | Bergen | 2021 |
| Bertheussen Malerservice AS | Sørreisa | 2005 |
| Bertheussen Varme Og Klima AS | Sørreisa | 2024 |
| Bertil Johnsen AS | Tana | 1996 |
| Bertils Lyft AB | 450 54 Hedekas | 1995 |
| Bertnes Bygg AS | Bodø | 2026 |
| Besab AB Nuf | Oslo | 2013 |
| Besi Mur Og Graving AS | Ski | 2020 |
| Beslag & Ventilasjon AS | Ulsteinvik | 2007 |
| Beslag Og Balkonger AS | Kleppestø | 1998 |
| Beslag Og Balkonger Eiendom AS | Kleppestø | 2017 |
| Beslag Og Balkonger Holding AS | Kleppestø | 2017 |
| Beslag Og Firkant Expressen AS | Oslo | 2025 |
| Beslim Lajqi "Besi-Industriemontage" | De-39288 Burg | 2026 |
| Besse Holding AS | Vinstra | 2013 |
| Best Byggtjenester AS | Gressvik | 2025 |
| Best Entreprenør AS | Kvelde | 2023 |
| Best Forskaling AS | Kjerrgarden | 2017 |
| Best I Høyden AS | Oslo | 2024 |
| Best I Test Varmepumper AS | Hvalstad | 2021 |
| Best Norge Bygg AS | Oslo | 2016 |
| Best På Bygg AS | Langhus | 2025 |
| Best Solution AS | Sandefjord | 2026 |
| Best Sport Pro Sp.Z.O.O | 34-300 Zywiec | 2013 |
| Best-Bygg AS | Molde | 2008 |
| Best-Hall OY | Fi-68300 Kalvia | 2002 |
| Beste Totalbygg AS | Mosjøen | 2022 |
| Besteland Mur Og Flis AS | Rysstad | 2012 |
| Bestena AS | Solbergelva | 2014 |
| Bester Bygg AS | Lommedalen | 2023 |
| Bestibygg AS | Klokkarvik | 2017 |
| Bestla AS | Kristiansund N | 2013 |
| Beston AS | Gjerdrum | 2006 |
| Bestum Enteprenor AS | Eiksmarka | 2025 |
| Beta Holding AS | Skreia | 2013 |
| Beta VVS AS | Oslo | 2019 |
| Betafence | 8550 Zwevegem | 2015 |
| Betco Da | Stavanger | 1998 |
| Bete Asfalt AS | Vikersund | 2024 |
| Bethel Håndverker AS | Sandvika | 2025 |
| Betka AS | Jessheim | 2024 |
| Beto Bygg AS | Oslo | 1993 |
| Betocut AS | Halden | 2006 |
| Betoform AS | Oslo | 2025 |
| Betong & Anlegg AS | Mosterøy | 1996 |
| Betong & Anlegg Entreprenør AS | Fauske | 2025 |
| Betong & Asfalt-Tjenester AS | Skien | 2020 |
| Betong & Maskin AS | Manger | 2016 |
| Betong & Tre AS | Borgenhaugen | 1997 |
| Betong & Utemiljø AS | Tjelta | 2026 |
| Betong Bolig AS | Overhalla | 2020 |
| Betong Bor & Sag AS | Langevåg | 2014 |
| Betong Bygg Da | Sagstua | 1995 |
| Betong Design AS | Sundbyfoss | 2022 |
| Betong Form Chinalski | Pl-67-100 Nowa Sol | 2020 |
| Betong Karlsen AS | Solbergmoen | 2015 |