InstallatørGruppen acquires Poul Sejr Nielsen in 44th Danish deal
InstallatørGruppen has agreed to acquire two subsidiaries of North Zealand technical contractor Poul Sejr Nielsen, adding around 220 employees and a combined annual revenue of approximately DKK 230 million (roughly £26 million) to the Nasdaq Copenhagen-listed group. The two entities being acquired are Poul Sejr Nielsen Service A/S and Poul Sejr Nielsen EL A/S; the remaining parts of the Poul Sejr Nielsen group are not included.
The acquired businesses generated an EBITA of approximately DKK 16 million in 2025, implying a margin of around seven per cent. Deal terms, including the acquisition price and any earn-out structure, were not disclosed. The transaction remains conditional on approval from competition authorities. Once cleared, it will mark InstallatørGruppen's 44th acquisition in Denmark and bring the group's total company count across Denmark and Switzerland to 49.
The deal
Poul Sejr Nielsen was founded in 1956 and has grown over nearly seven decades into one of the larger installation businesses serving North Zealand and the Greater Copenhagen area. Its activities span electrical and plumbing services, turnkey project delivery, and multi-year framework agreements for private, public and commercial customers. Areas of specialisation include district heating, lighting and LED systems, and energy optimisation, the last of which is the most directly relevant to InstallatørGruppen's stated positioning in the energy transition.
Peter Frandsen, chief executive of InstallatørGruppen in Denmark, described the target as "a well-run company with a strong organisation, skilled employees and considerable expertise within service, framework agreements and technical contracting alike." Poul Sejr Nielsen will continue to operate independently under its existing management team of Michael Madsen, Jonas Bach and Mikkel Gulbæk, consistent with InstallatørGruppen's decentralised partnership model.
Market context
InstallatørGruppen's acquisition strategy sits at the intersection of two converging trends: the ongoing consolidation of Europe's fragmented technical-services sector, and growing demand for energy-optimisation and building-decarbonisation work driven by EU policy. The group explicitly positions itself as a partner for customers implementing the energy transition, and its service portfolio, spanning heating, ventilation, refrigeration, solar installations and building automation, mirrors the retrofit and electrification scope that EU energy-efficiency directives are creating at scale.
The broader backdrop is relevant for readers allocating capital to building-services and energy-services companies. European infrastructure investors and buy-and-build platforms have been drawn to technical installation businesses because of their exposure to long-duration service contracts, stable cash generation and regulatory tailwinds from the EU's Energy Performance of Buildings Directive and the Renovation Wave strategy. Multi-year framework agreements of the kind Poul Sejr Nielsen holds are particularly valued, as they provide revenue visibility and reduce customer-concentration risk.
At 49 group companies across two countries, InstallatørGruppen is firmly in consolidator territory. Whether the group pursues a Swiss or broader European expansion alongside continued Danish bolt-on acquisitions will be a key question for investors watching the stock on Nasdaq Copenhagen. The company did not indicate a medium-term acquisition volume target or a capital allocation framework in this release.
The competition-authority review timeline was not specified. Investors will look for clearance confirmation and any disclosure of acquisition multiples as the near-term milestones.