Structural and architectural steel
Building and infrastructure steelwork, from technical design to site installation.
View sourceStructural steel engineering, fabrication and erection
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Building and infrastructure steelwork, from technical design to site installation.
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Subcontract preparation, welded fabrications, inspection and surface treatment.
View sourceWelding of structural steel, reinforcement and stainless components.
Non-destructive testing of industrial steelwork.
Subcontract sawing and drilling of industrial steel components.
Industrial subcontract shot blasting.
Order-based manufacture of load-bearing steelwork and welded assemblies.
Site installation of fabricated steel structures; documented work includes halls, extensions and bridges.
Structural calculations and 3D detailing for building and infrastructure steelwork.
In-house surface treatment of fabricated steel; project archive includes fire-protective painted steel.
Topsoe
March 2023: erection of 1,000 tonnes of steel for Topsoe’s new factory.
BAUHAUS
Erected 650 tonnes of structural steel for BAUHAUS Sønderborg during the 2021–2022 project.
LINAK
January 2021: 530 tonnes of steel for a third circular building of approximately 14,000 m².
Tækker House
May 2021: ongoing renovation involvement with load-bearing and visible architectural steel.
Alvac Industry
January 2025: fabricated and painted frame sections of 43.5 × 5.9 m and 30 × 6.1 m. Alvac supplied drawings and arranged permits; final use is undisclosed.
Benløse Varmeværk
March 2024: steel structure erection for the heating plant.
Kolding Storcenter
February 2024: installation of extension steelwork.
Skive Fjernvarme
March 2023: nearly 100 tonnes of fire-protective painted steel erected around existing concrete and equipment.
Siemens
October 2022: erection of a large production hall.
Vestjysk Andel
August 2022: a 16-metre-high silo building.
Vestjysk Beslag
June 2022: steel structure erection for the new headquarters.
Carl Hansen & Søn
February 2022: 60 tonnes of steel with a 29 m span.
October 2023 HI exhibition sample described as hand welded.
June 2023: first stage manufactured, packed and dispatched.
March 2022: installation using an overhead crane beneath temporary covering.
October–November 2021: 230 tonnes of steel, transfer beams and lattice trusses installed.
Logistics-centre steelwork at REMA 1000 / Reitan in Horsens, 2021.
Structural steelwork in the Den Blå Planet project gallery.
F.C. København
Completed steel-girder and concrete-foundation reinforcement of Nedre B in July 2025, scheduled around matches. Upper B was a separate project.
Participation in the historic Helsingør shipyard renovation in November 2025.
Steel erection for the Sportscenter Herning padel centre in July 2022.
EN 1090-1:2009+A1:2011
Execution classes EXC 1–4. Intertek 2794-CPR-10017, issued 8 January 2025; J. LANGKJÆR STÅLBYG A/S, Park Allé 64 and 66. Design and welding included; S235–S460, reinforcement and stainless group 8.1. Ongoing validity conditional on surveillance.
ISO 3834-2:2021
Intertek 10017, issued 8 January 2025, valid until 26 October 2029 subject to conditions. Steel components; processes 111, 135, 136, 138 (certificate qualifies ISO 3834-4), 141 and 783. Same entity/site scope as FPC.
EN ISO 9606-1
Welders qualified to EN ISO 9606-1.
Langkjær builds load-bearing and architectural steelwork for buildings, infrastructure and industrial projects. Its own technical and production departments support the route from calculations and drawings through manufacture, surface treatment and installation. It also accepts industrial subcontract tasks and offers project environmental documentation.
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Updated Sep 13, 2026