What Siers GmbH does

Siers GmbH is the German operating subsidiary of Siers Groep Oldenzaal B.V., a privately held Dutch family business founded in 1964 in Twente that delivers underground infrastructure services across the Netherlands and Germany. Its service portfolio covers seven core expertises — electricity (low- and medium-voltage networks), water pipelines, telecom and fiber optics, Infraconsult (design, planning, registration), lightning protection and grounding, district heating and cooling, and engineering — executed under a turnkey 'totaalontzorger' model that spans advisory, design, execution, maintenance and management.

Technically, Siers differentiates through trenchless horizontal directional drilling (HDD), supported by 50-150 ton rigs operated via a joint venture with Welvreugd (SWST), gyro-steering for sub-surface precision under dikes, motorways and waterways, and leak-detection systems for district heating/cooling networks. It contributes to and executes the PILS (Proactief Investeren in Laagspanning) neighborhood modernization approach developed within Netbeheer Nederland, alongside parallel PIMS and NuMeren programs for Enexis and Liander, with multi-year contracted scope extending past 2027-2028.

Revenue is generated through project-based professional services contracts with utility network operators (Enexis, Liander), municipalities and water boards, telecom operators (Eurofiber), industrial customers (Ten Cate) and hyperscale data center developers (Google). Pricing is not publicly disclosed and contracts are typically multi-year and scope-defined. Customer concentration is high, anchored by Dutch grid operators. The company is family-owned, with no external private equity, venture or public market participation identified in the data.

Name

Siers GmbH

Legal name

Siers Groep Oldenzaal B.V.

Website

https://siersgmbh.de

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

11–50 employees

Short description

Siers GmbH is the German arm of Dutch family-owned Siers Groep (est. 1964), delivering turnkey underground infrastructure services — electricity, water, telecom/fiber, district heating/cooling and lightning protection — to grid operators, municipalities, water boards and enterprise clients across the Netherlands and Germany.

Ownership category

akta.pro rank

Product category

Underground Infrastructure Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (23822)

SIC

Electric, Gas & Sanitary Services (4900)

akta.pro primary industry

Overhead & Underground Collection System Construction (MV/HV Lines, Duct Banks) (EUAEADAG)

Keywords

• Underground infrastructure services
• Electrical network installation
• Fiber optic construction
• District heating systems
• Trenchless drilling services

Headquarters

HQ city

Oldenzaal

HQ country

Netherlands

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Infrastructure, Operations, Technology or R&D, Marketing or Sales, Others

Revenue model

1. Infrastructure Project Services: Full-service infrastructure project delivery from advisory and engineering through execution, maintenance and management. Projects include electricity network installation, water pipeline systems, telecom/fiber optic deployment, district heating and cooling networks, and lightning protection systems. Revenue is generated through project-based contracts with utility companies, municipalities, and private sector clients.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Siers GmbH is the German subsidiary of Siers Groep, a Dutch family business operating since 1964, specializing in turnkey underground infrastructure project delivery. The company installs, maintains, and modernizes electricity networks (low-voltage and medium-voltage), water pipelines, telecom/fiber optic networks, district heating and cooling systems, and lightning protection/grounding systems. Projects span from advisory and engineering through execution, maintenance, and management for grid operators, municipalities, water boards, and private sector clients in the Netherlands and Germany.

Product overview

Siers GmbH is part of Siers Groep, a Twente-based family infrastructure company operating since 1964. The company provides a unified portfolio of underground infrastructure services organized into seven core expertises: Elektra (electricity networks), Water (water pipelines), Telecom (fiber optic/coax networks), Infraconsult (design/planning/registration), Bliksem + Aarding (lightning protection), Koude + Warmte (district heating/cooling), and Engineering. The company operates as a turnkey solutions provider (Totaalontzorger), handling projects from advisory and design through execution, maintenance, and management. Key programs include PILS (Proactief Investeren in Laagspanning) for low-voltage network modernization, PIMS for medium-voltage, and NuMeren for Liander network operator projects. The subsidiary SWST provides trenchless installation techniques (horizontal directional drilling). The company operates across the Netherlands and Germany, serving grid operators, water boards, municipalities, contractors, and private sector clients.

Differentiator

Problem solved

Functional benefit

Brands

• SWST: Siers Welvreugd Sleufloze Technieken - joint venture between Siers and Welvreugd focusing on trenchless construction techniques including horizontal directional drilling
• PILS
• PIMS
• NuMeren
• Privatis
• WerkpleSiers

Products and services

• Elektra (Electricity Network Services) Electricity infrastructure services including installation, maintenance, and upgrading of low-voltage and medium-voltage electricity networks and connections for grid operators, municipalities, and private sector clients.
• Water Pipeline Services Installation of water pipelines for drinking, cooling, and process water. Coordinates water projects from start to finish as chain coordinator.
• Telecom / Fiber Optic Network Installation Installation of fiber optic and coax telecommunications networks, from initial design to maintenance, creating reliable and high-speed internet connections for telecom operators and grid companies.
• Infraconsult (Infrastructure Consulting) Takes over work from grid operators, water boards, governments, contractors and private sector by designing, planning and registering cable and pipeline networks.
• Bliksem + Aarding (Lightning Protection and Grounding) Complete solutions for lightning and surge protection, from design to maintenance, protecting people, buildings and installations.
• Koude + Warmte (District Heating and Cooling) Specializes in installation of heat and cold networks for efficient and reliable temperature regulation. Installs high-quality insulated pipes to minimize energy loss and uses innovative leak detection systems.
• Engineering Services Sustainable solutions for cable works and pipelines, from installation to maintenance and decommissioning. Realizes safe, future-proof networks meeting highest efficiency and safety standards.
• Totaalontzorger (Turnkey Solutions) Turnkey project delivery from advice and engineering to execution, maintenance and management. Handles complete infrastructure projects from A to Z as a single solution provider.

Quantifiable outcome

• Graven Es project: Only 66 transfers required for 840 homes (compared to hundreds more in previous neighborhood approaches), enabling efficient modernization with minimal resident disruption
• +3 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• SWST (Siers Welvreugd Sleufloze Technieken)coreStrategic or Co-development Partner · 1 January 2023Joint venture between Siers and Welvreugd established around 2023 to perform trenchless technology (HDD) operations internally. SWST handles horizontal directional drilling projects enabling Siers to offer complete turnkey solutions for grabenloze technieken (trenchless techniques). Equipment includes Vermeer DG Serie 2, Ditchwitch JT 25, and pipe jacking systems (Boogzinkers Hydrolans) with 50 and 150 ton capacity rigs.
• WelvreugdcoreStrategic or Co-development PartnerStrategic partner in SWST joint venture, contributing expertise in trenchless technology and HDD operations. Welvreugd's experienced drill operators train Siers personnel including Carlo de Wilt who is developing into a certified driller for independent project execution.
• EnexiscoreChannel Partner/ Reseller/ DistributorMajor grid operator commissioning large-scale infrastructure projects including PILS neighborhood approach, PIMS program, and cable installations like the Winschoten-Google connection project (9km, double-route, 18km total pipe). Primary enterprise customer for Dutch network infrastructure services.
• LiandercoreChannel Partner/ Reseller/ DistributorGrid operator commissioning the NuMeren program for medium voltage network expansion. Siers provides design, execution and delivery of network infrastructure under this partnership.
• AktiefTeamminorChannel Partner/ Reseller/ DistributorSubcontractor for digging and assembly work on Graven Es neighborhood project in Oldenzaal. Handles excavation and mounting activities under Siers project management.
• TSNedminorChannel Partner/ Reseller/ DistributorTraffic management company responsible for traffic measures on Graven Es project in Oldenzaal. Ensures safe traffic flow and pedestrian access during construction.
• FröhlichkeitminorChannel Partner/ Reseller/ DistributorSubcontractor operating drilling equipment (50 and 150 ton rigs) with gyro steering capabilities for the Zwartsluis-Hasselt project. Provided horizontal directional drilling services for 5.5km of the 8.5km route including challenging dike zone crossings.
• Gemeente OldenzaalminorChannel Partner/ Reseller/ DistributorMunicipality responsible for road restoration work in Graven Es neighborhood project. Siers handles underground infrastructure while municipality manages surface restoration, demonstrating integrated project approach.

Scale indicators5 records

Recent moves7 records

Expansion highlights6 records

Regional players

• SPIE GmbH: European multi-technical services provider with significant German operations in electrical networks, energy infrastructure, and telecom. Relevant German market peer as Siers GmbH expands fiber optic and infrastructure construction in Germany.

Direct peers

• Visser & Smit Hanab: Dutch utility infrastructure contractor specializing in underground cable and pipeline construction for energy, water, and telecom networks. Direct competitor serving the same Dutch DSO clients (Enexis, Liander, etc.) with comparable project services and trenchless capabilities.
• Mourik: Dutch industrial services and infrastructure contractor with underground pipeline and cable construction capabilities. Direct peer serving similar utility and industrial clients with comparable project-based services in the Netherlands.
• Koninklijke Volker Stevin: Dutch infrastructure subsidiary of VolkerWessels specializing in energy infrastructure, including underground cable and pipeline construction for grid operators. Highly comparable in target customers and service offering to Siers' electricity, water, and telecom expertise lines.
• Wayss & Freytag Ingenieurbau: German specialty contractor in underground construction including trenchless techniques, tunneling, and pipeline installation. Comparable trenchless technology capabilities and serves German infrastructure market where Siers GmbH is expanding.
• A. Hak: Dutch specialist contractor in underground cable and pipeline infrastructure for utilities and energy networks. Directly comparable business model, serving similar grid operator clients with similar underground construction services including electricity, gas, water, and telecom.
• Denys Group: Belgian-headquartered infrastructure contractor with significant Dutch operations in underground utility construction, including electricity networks, water, and district heating. Comparable in service mix and client base (grid operators, municipalities) across the Benelux region.

Broad incumbents

• Royal BAM Group: Major Dutch-headquartered European construction group operating across infrastructure, property, and civil engineering including energy networks. Larger incumbent with overlapping capabilities in underground utility construction for Dutch and German clients.
• Heijmans: Dutch construction and infrastructure company with significant underground utility and energy infrastructure activities alongside broader building and civil works. Larger portfolio than Siers but directly competing for the same Dutch DSO contracts.
• VolkerWessels: Major Dutch construction conglomerate with €7B+ revenue offering building, infrastructure, and energy solutions including underground utility construction. Larger and broader than Siers but operates overlapping underground infrastructure capabilities through Volker Stevin.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/siers-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries8 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Siers GmbH