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Karlshamn has 311 active companies in construction (section F of SNI 2025). Common activities among the largest companies are byggande av bostadshus och andra byggnader, elinstallationer and byggnadssnickeriarbeten.
The largest employers include Jsb Construction AB, Elcommunication Sweden AB and Elleholms Maskin AB. See also all companies in Karlshamn.
| Company | Employees |
|---|---|
| Jsb Construction AB556401-1756 · founded 1990 | 200-499 |
| Elcommunication Sweden AB556582-3753 · founded 2000 | 50-99 |
| Elleholms Maskin AB556863-2383 · founded 2011 | 50-99 |
| PMB Construction Sverige AB556765-2572 · founded 2013 | 50-99 |
| Allt i Murning i Karlshamn Aktiebolag556192-4985 · founded 1977 | 20-49 |
| Blekinge Golventreprenad AB559412-7473 · founded 2023 | 20-49 |
| Elinstallationer i Karlshamn AB556691-1839 · founded 2006 | 20-49 |
| G Folkessons Maskin & Transport AB556587-2461 · founded 2000 | 20-49 |
| J. Mattssons VVS Aktiebolag556481-6014 · founded 1994 | 20-49 |
| Network Solutions Infra Sverige AB556728-8229 · founded 2007 | 20-49 |
| Anders Erikssons VVS Aktiebolag556447-5373 · founded 1992 | 10-19 |
| Blekinge Stensättning AB556956-3025 · founded 2014 | 10-19 |
| Carlshamns Rörteam AB556618-2522 · founded 2001 | 10-19 |
| Kubicom AB556837-3079 · founded 2011 | 10-19 |
| Kylinge Bygg Aktiebolag556427-6128 · founded 1991 | 10-19 |
| Mörrums Gräv Aktiebolag556373-6395 · founded 1990 | 10-19 |
| Nordiska Energilösningar Sverige AB559510-6690 · founded 2024 | 10-19 |
| Olle Svensson Bygg Aktiebolag556100-0323 · founded 1976 | 10-19 |
| Sten Nilssons Elektriska AB556540-2517 · founded 1998 | 10-19 |
| Syd Communication & Security AB556725-2837 · founded 2007 | 10-19 |
| TRT Gruppen AB559051-6471 · founded 2016 | 10-19 |
| VBBA i Karlshamn AB559140-7381 · founded 2018 | 10-19 |
| ABK Tekniska AB556741-7125 · founded 2008 | 5-9 |
| Blekinge Bygg & Anläggning AB556852-3699 · founded 2011 | 5-9 |
| Blekinge Fasad Aktiebolag556102-6963 · founded 1972 | 5-9 |
| Blekinge Kakel & Klinker AB556842-7255 · founded 2011 | 5-9 |
| D Bygg i Svängsta AB559191-9468 · founded 2019 | 5-9 |
| Elmontage, E Gustafsson Aktiebolag556229-0485 · founded 1983 | 5-9 |
| Halix VVS AB556415-6908 · founded 1991 | 5-9 |
| Kranlyft i Karlshamn AB556566-9099 · founded 1999 | 5-9 |
| Larmsec Syd AB556586-9483 · founded 2000 | 5-9 |
| Markus Bygg i Mörrum AB559184-8972 · founded 2019 | 5-9 |
| Målarmäster i Karlshamn AB556816-1060 · founded 2010 | 5-9 |
| Måleribolaget i Karlshamn AB556598-1510 · founded 2001 | 5-9 |
| Palmbergs Bygg i Karlshamn AB559296-2749 · founded 2021 | 5-9 |
| SHV Sälj Aktiebolag556786-6552 · founded 2009 | 5-9 |
| Snickeri & Bygg i Karlshamn AB559273-4510 · founded 2020 | 5-9 |
| Stängsel & Montage Sverige AB559236-3948 · founded 2020 | 5-9 |
| Takexperten Blekinge AB559188-7947 · founded 2019 | 5-9 |
| Aktiebolaget Byggson556560-9236 · founded 1998 | 1-4 |
| Alex Törnkvist Rörservice AB559575-4143 · founded 2026 | 1-4 |
| Alkabri, Mohamed800105-7218 · founded 2021 | 1-4 |
| Anders Nilsson el AB559296-2756 · founded 2021 | 1-4 |
| Asarums Bygg och Fastigheter AB559076-9468 · founded 2016 | 1-4 |
| Assarsson Målerifirma AB559564-8220 · founded 2026 | 1-4 |
| Blekinge Murservice Aktiebolag556500-7936 · founded 1995 | 1-4 |
| Blekinge Trädgårdsservice AB556594-0730 · founded 2000 | 1-4 |
| Blyckert Byggentreprenad AB559552-7416 · founded 2025 | 1-4 |
| Blåder bygg & service AB559101-4880 · founded 2017 | 1-4 |
| Bodekull Villamontage Sweden AB556572-5735 · founded 1999 | 1-4 |