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Östhammar has 393 active companies in construction (section F of SNI 2025). Common activities among the largest companies are byggande av bostadshus och andra byggnader, mark- och grundarbeten and elinstallationer.
The largest employers include A Måleri & Golv i Uppland AB, Öregrund Bygg AB and Alunda Bygg AB. See also all companies in Östhammar.
| Company | Employees |
|---|---|
| A Måleri & Golv i Uppland AB556207-4129 · founded 1982 | 20-49 |
| Öregrund Bygg AB556507-0165 · founded 1997 | 20-49 |
| Alunda Bygg AB556611-1299 · founded 2001 | 10-19 |
| Auctus Contractor AB556751-6322 · founded 2008 | 10-19 |
| Bengt Stenberg Måleri i Östhammar Aktiebolag556468-1582 · founded 1993 | 10-19 |
| Boris & Son Bygg AB556672-9975 · founded 2005 | 10-19 |
| Delka Produkter AB556623-4802 · founded 2002 | 10-19 |
| Frödin allservice AB556573-5346 · founded 1999 | 10-19 |
| Magnus Falk Entreprenad AB556620-0506 · founded 2002 | 10-19 |
| Roslagens Golv Östhammar AB556730-6302 · founded 2007 | 10-19 |
| Roslagens Industriteknik AB556653-1355 · founded 2004 | 10-19 |
| Thyrs Schakt och Entreprenad AB559186-5299 · founded 2019 | 10-19 |
| VATECH i Östhammar AB556770-0512 · founded 2009 | 10-19 |
| Öregrunds El & VVS AB556663-1767 · founded 2005 | 10-19 |
| Bygg Craft Norduppland AB559176-8394 · founded 2019 | 5-9 |
| D Lindahl Roslagssnickaren Östhammar AB559523-2967 · founded 2025 | 5-9 |
| Elektro-Larsson AB556185-7581 · founded 2006 | 5-9 |
| Eltjänst Karlbom AB559309-0664 · founded 2021 | 5-9 |
| Gimo Rörmontage AB559108-7456 · founded 2017 | 5-9 |
| Hedenskog Betong i Uppsala AB556927-9473 · founded 2013 | 5-9 |
| J & J Allservice & Konsult i Östhammar AB559151-7221 · founded 2018 | 5-9 |
| JT Schakt AB556868-1927 · founded 2012 | 5-9 |
| ML:s Schakt Öregrund AB556619-0228 · founded 2002 | 5-9 |
| Naeslund El AB559416-9921 · founded 2023 | 5-9 |
| Olands måleri AB556932-6241 · founded 2013 | 5-9 |
| Olandsbyggarna AB556888-2582 · founded 2012 | 5-9 |
| Orden Bygg AB559155-8100 · founded 2018 | 5-9 |
| Perssons Schakt & Entreprenad AB556952-0157 · founded 2013 | 5-9 |
| Richard Hedman El AB556815-2309 · founded 2010 | 5-9 |
| Rörteam Roslagen AB556331-0514 · founded 1992 | 5-9 |
| Signalia Aktiebolag556612-7576 · founded 2001 | 5-9 |
| Svartbäcks Byggservice AB556663-1635 · founded 2004 | 5-9 |
| UB gruppen AB559476-8466 · founded 2024 | 5-9 |
| Upplands Mark och Betong AB556979-1493 · founded 2014 | 5-9 |
| Öregrundsgrepen Bygg & VVS AB559039-9043 · founded 2016 | 5-9 |
| A.L Entreprenad & Samordning AB559386-4845 · founded 2022 | 1-4 |
| A.P. Andersens Maskinstation Aktiebolag556187-4677 · founded 1975 | 1-4 |
| AB Isacsons Entreprenad556361-2455 · founded 1989 | 1-4 |
| ACRAFT i Östhammar AB556895-1163 · founded 2012 | 1-4 |
| Alexander Hermansson AB559351-6130 · founded 2021 | 1-4 |
| Alunda Elektro Service Aktiebolag556551-9427 · founded 1998 | 1-4 |
| Alunda Sten och Fasad AB556953-0859 · founded 2014 | 1-4 |
| Beppes Bygg och Mark Alunda AB556856-2143 · founded 2011 | 1-4 |
| Bergströms Byggteknik AB559508-5761 · founded 2025 | 1-4 |
| Björkö-Arholma Turism AB556752-1751 · founded 2009 | 1-4 |
| Björndal consulting AB559473-5341 · founded 2024 | 1-4 |
| Borgström Entreprenad AB559426-9622 · founded 2023 | 1-4 |
| Bromans Entreprenad Dannemora AB559245-5256 · founded 2020 | 1-4 |
| ByggFirma Yngve Johansson AB556104-5831 · founded 2015 | 1-4 |
| Corner Ranch Entreprenad AB559306-4537 · founded 2021 | 1-4 |