What KNAACK & JAHN does

KNAACK & JAHN is a privately held German industrial construction group headquartered in Hamburg, operating since September 1965 under the umbrella brand KJ-Firmenverbund. The group's core activity is industrial pipe and plant construction (Rohr- und Anlagenbau), encompassing welding, assembly, and on-site installation of piping systems and production plants for the chemical, mineral oil, food processing, and shipbuilding industries. Over the past two decades the founder-family owners have progressively unbundled adjacent capabilities into wholly owned subsidiaries: KNAACK & JAHN Anlagenbau GmbH (Leuna, founded 1996) for dedicated plant construction; K+J Haustechnik GmbH (Hamburg, 2000) for heating, sanitation, ventilation, and refrigeration services; Knaack & Jahn Schiffbau GmbH (Hamburg, 2006) for marine pipe systems and ship repair; and HanseGarant Beratungsgesellschaft mbH, a consulting entity that also handles intra-group data protection, IT, and commercial administration.

The business operates a project-based, B2B professional services model. Revenue is generated through long-term industrial construction contracts executed directly on customer sites by the group's own workforce of over 500 employees. The go-to-market is enterprise field sales, targeting industrial buyers (chemical plants, refineries, food producers, shipyards) with technical sales engineers and project managers; there is no digital marketing or reseller channel, and no evidence of recurring SaaS or licensing revenue. Underlying technology is conventional industrial craftsmanship — pipe welding, mechanical assembly, and installation — supplemented by a structured apprenticeship and dual-study program covering nine trades, which functions as a deliberate skilled-labor talent pipeline.

Ownership remains in the hands of the founding family and operating management, led by Managing Directors (Geschäftsführer) Manfred Klitzke and Mike Gansefort, per the Hamburg commercial register (HRB 32073). There are no public listings, no external private equity or venture capital investment disclosed, and no M&A activity in the input data. The company appears to have grown organically through service-line spin-offs rather than external transactions, and its revenue is not publicly disclosed.

Name

KNAACK & JAHN

Legal name

Knaack & Jahn GmbH

Website

https://k-j.de

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

51–100 employees

Short description

KNAACK & JAHN is a privately held Hamburg-based industrial construction group that designs, welds, and installs pipe systems and production plants for German chemical, mineral oil, food, and shipbuilding customers, operating five subsidiaries and a 500+ person workforce.

Ownership category

akta.pro rank

Product category

Industrial Pipe and Plant Construction

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

Fabricated Plate Work (Boiler Shops) (3443)

akta.pro primary industry

Industrial/Process Piping & Mechanical Contracting (IMAFALAG)

akta.pro secondary industries

Industrial/Process Plant General Contracting (IMAFAAAH), HVAC & Refrigeration Contracting (IMAFALAB)

Keywords

• Industrial pipe construction
• Plant construction services
• Marine systems installation
• Building HVAC services
• Ship repair services

Headquarters

HQ city

Hamburg

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales

Revenue model

1. Industrial Pipe and Plant Construction: Project-based services for industrial pipe systems and production plant construction for chemical, mineral oil, food industries, and shipbuilding. Revenue is generated through long-term project contracts, assembly, installation, and maintenance services across the corporate group's subsidiaries.

Go-to-market motion1 record

Distribution channels1 record

Core offering

KNAACK & JAHN delivers industrial pipe and plant construction (Rohr- und Anlagenbau) for chemical, mineral oil, and food industry customers, including production plant manufacturing, pipeline system assembly, welding, installation, and on-site maintenance. Through its subsidiaries, the group also provides industrial plant construction in Leuna, marine systems and ship repair, building HVAC services, and management consulting.

Product overview

KNAACK & JAHN operates as a group of affiliated companies (KJ-Firmenverbund) providing industrial construction and engineering services. The core offering centers on industrial pipe and plant construction through Knaack & Jahn GmbH, serving chemical, petroleum, and food industries. The group has expanded into specialized sectors including plant construction (Anlagenbau GmbH), marine systems and ship repair (Schiffbau GmbH), building services/HVAC (K+J Haustechnik), and management consulting (HanseGarant). This is a service-oriented industrial construction company, not a software product company.

Differentiator

Problem solved

Functional benefit

Products and services

• Industrial Pipe and Plant Construction (Knaack & Jahn GmbH)

Named customers4 records

Segments1 record

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Five partnerships are on record, tiered core.

• Knaack & Jahn Schiffbau GmbHcoreOthers · 1 January 2006Subsidiary founded in 2006, specializing in pipe systems for ships and ship repair (Marine Systems and Ship Repair). Located in Hamburg.
• K+J Haustechnik GmbHcoreOthers · 1 January 2000Subsidiary founded in 2000, providing building technology services including heating (Heizung), sanitation (Sanitär), ventilation (Lüftung), and refrigeration (Kältetechnik) for residential and commercial buildings.
• Knaack & Jahn Anlagenbau GmbHcoreOthers · 1 January 1996Subsidiary founded in 1996 in Leuna, focused on plant construction (Anlagenbau), serving the industrial market with specialized plant engineering services.
• Knaack & Jahn GmbHcoreOthersCore subsidiary within the KJ-Firmenverbund group, specializing in industrial pipe and plant construction (Rohr- und Anlagenbau) for chemical, mineral oil, and food industries.
• HanseGarant Beratungsgesellschaft mbHcoreOthersSubsidiary providing consulting services including data protection officer (Datenschutzbeauftragter) services. Located at Usedomstraße 14, Hamburg. Also handles IT management and commercial operations for the group.

Scale indicators2 records

Recent moves9 records

Expansion highlights4 records

Broad incumbents

• HOCHTIEF AG: HOCHTIEF is a major German-headquartered construction company with industrial plant, infrastructure, and building projects. It is comparable to KNAACK & JAHN in industrial construction and German roots, but operates as a much larger, broader incumbent across multiple construction segments.
• Jacobs Solutions Inc. Jacobs Solutions (formerly Jacobs Engineering) is a global professional services firm delivering engineering, construction, and plant services for industrial and process-industry clients. Comparable to KNAACK & JAHN's industrial plant construction work, but with a much broader portfolio and global footprint.
• VINCI Energies: VINCI Energies is a French-headquartered European industrial services and infrastructure group with activities in electrical engineering, HVAC, piping, and industrial process services. Comparable to KNAACK & JAHN's industrial pipe and HVAC subsidiaries as a European industrial services incumbent, though operating at significantly larger scale.
• Fluor Corporation: Fluor is a global EPC contractor delivering chemical, petrochemical, and industrial plant projects worldwide. It is comparable to KNAACK & JAHN's plant construction services but operates as a much larger incumbent with broader international reach.
• thyssenkrupp Uhde: thyssenkrupp Uhde is a large German EPC contractor for chemical, petrochemical, and fertilizer plants. It is comparable to KNAACK & JAHN's industrial plant construction business but competes as a much larger, broader incumbent with proprietary process technologies.

Direct peers

• Linde Engineering: Linde Engineering is the engineering and plant construction arm of Linde plc, building large-scale chemical, petrochemical, and gas processing plants worldwide. Comparable to KNAACK & JAHN's chemical and mineral oil plant construction work, though operating at a much larger project scale.
• ENGIE Deutschland: ENGIE Deutschland (formerly Cofely) is one of Germany's largest building services and HVAC contractors, providing heating, ventilation, refrigeration, and plumbing services. It is directly comparable to K+J Haustechnik GmbH within the KJ-Firmenverbund.
• Worley Limited: Worley is a global engineering and industrial services provider focused on energy, chemicals, and resources projects, including pipe and plant construction. Comparable to KNAACK & JAHN's core industrial pipe and plant construction serving chemical and mineral oil customers, though at much larger scale.
• Bilfinger SE: Bilfinger is a leading German industrial services provider offering piping, plant construction, maintenance, and engineering services to chemical, petrochemical, and energy customers. Like KNAACK & JAHN it is a German-headquartered industrial services group focused on pipe and plant construction for process industries, though significantly larger.
• Exyte GmbH: Exyte (formerly M+W Group) is a German-based global designer, engineer, and constructor of high-tech facilities and cleanrooms for the semiconductor, biotech, and pharmaceutical industries. It is comparable to KNAACK & JAHN as a Germany-based industrial plant construction group delivering complex process-industry facilities.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries5 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 KNAACK & JAHN