What KARL Weiss Technologies does

KARL WEISS Technologies GmbH is a Berlin-headquartered, private German construction company founded in 1906 and operating for over 120 years in civil and underground infrastructure. The company is wholly owned by the KARL WEISS-Stiftung, a non-profit foundation established in 2009 and recognized by the Berlin Senate, with operational leadership held by two Managing Directors (Lars Wittmann and Holger Turloff). It employs approximately 87 people, including roughly 10 apprentices, and self-performs all construction work with in-house personnel and partly self-developed equipment.

The company's core business is trenchless (grabenlose) rehabilitation and replacement of underground pressure pipelines, supported by patented proprietary technologies — the starline® fabric hose relining process (launched 1991, covering DN 20–DN 1200 at up to 30 bar, certified for 50-year service life) and the hydros® hydraulic pipe pulling and splitting process (DN 50–DN 400, certified DVGW GW 301 GN 1). A specialized civil engineering (Spezialtiefbau) division handles large bored piles, soldier pile walls, sheet piling, groundwater management, and complex excavation pits, complemented by RAL-certified liquid soil (Flüssigboden) installation. The company holds DVGW GW-301/GW-302, DIN EN ISO 9001:2015, RAL 507, BG BAU, and WHG §19 certifications, and has rehabilitated over 700 km of pressure pipelines since 1991.

Revenue is generated through project-based, quote-priced construction contracts won via competitive public tendering and special proposal development, targeting municipal utilities (notably Berliner Wasserbetriebe as a certified partner), public authorities, and select enterprise/industrial clients (Vattenfall, ABB, Grün Berlin). Customers are concentrated in Berlin and surrounding Germany, with limited international work (e.g., Switzerland). Projects are self-performed with no distribution intermediaries, marketed primarily through a bilingual website, industry association memberships (DVGW, RSV, FG-Bau, grabenlos.de), and project case-study references.

Name

KARL Weiss Technologies

Legal name

KARL WEISS Technologies GmbH

Website

https://karl-weiss.com

Company type

Private

Founded year

1906

Operating status

Operating

Headcount range

51–100 employees

Short description

KARL WEISS Technologies GmbH is a Berlin-based German construction company specializing in trenchless pressure-pipe rehabilitation and special civil engineering, serving municipal utilities, public authorities, and industrial clients with patented starline® and hydros® proprietary technologies.

Ownership category

akta.pro rank

Product category

Trenchless Pipe Rehabilitation Services

NAICS

Power and Communication Line and Related Structures Construction (237130), Plumbing, Heating, and Air-Conditioning Contractors (238220), Other Foundation, Structure, and Building Exterior Contractors (238190)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600)

akta.pro primary industry

Modular/Offsite General Contracting & Installation (IMAFAAAK)

Keywords

• Trenchless pipe rehabilitation
• Pressure pipeline construction
• Special civil engineering
• Sewer network renovation
• Ground engineering services

Headquarters

HQ city

Berlin

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Supply Chain, Others, Marketing or Sales

Revenue model

1. Construction Services - Trenchless Pipe Rehabilitation: Project-based contracts for trenchless rehabilitation of pressure pipelines using proprietary starline® and hydros® technologies for gas, water, wastewater, and industrial pipelines. Includes pipe jacking, rehabilitation, and replacement services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

KARL WEISS Technologies GmbH is a construction and civil engineering company that delivers trenchless rehabilitation and replacement of pressure pipelines (gas, water, wastewater, district heating, industrial) using its proprietary starline® and hydros® processes, alongside open-trench sewer and pipeline construction and special civil/ground engineering works. Services are sold project-by-project to municipal utilities, public authorities, and private industrial clients in Germany and select European markets, with the company self-performing all works using its own trained personnel and self-developed equipment.

Product overview

KARL Weiss Technologies offers a comprehensive portfolio of trenchless pipe rehabilitation solutions through two proprietary core technology platforms: the starline® system (fabric hose relining for pressure pipes, launched 1991) and the hydros® system (hydraulic pipe pulling and splitting). The starline® family includes multiple variants (HPL-S, HPL-G, 1000, 2000, 200) targeting different pipe materials and applications. The hydros® family includes variants (PLUS, STEEL, STAR, BOY, LEAD) designed for different pipe materials and rehabilitation scenarios. Together, these systems enable complete pipeline reconstruction without excavation.

Differentiator

Problem solved

Functional benefit

Brands

• starline®: A rehabilitation method developed for the permanent trenchless rehabilitation of pressure pipes weakened by ageing using fabric hose relining. Available for dimensions from DN 20 to DN 1200 and operating pressures up to 30 bar (up to 40 bar for wastewater and industrial pipes).
• hydros®

Products and services

• starline® Process — Trenchless Pressure Pipe Rehabilitation Proprietary fabric hose relining process for the permanent trenchless rehabilitation of pressure pipes (DN 20 to DN 1200, operating pressures up to 30 bar, up to 40 bar for wastewater/industrial pipes). An adhesive-filled seamless round-woven plastic-coated fabric hose is reversed into the pipe by overpressure. Certified for a 50-year service life; over 700 km of pipelines rehabilitated since 1991. Suited for gas, water, wastewater, and industrial pipelines, offered to municipal utilities, public authorities, and industrial clients.
• hydros® Process — Trenchless Pressure Pipe Replacement Proprietary hydraulic pipe pulling and splitting method for fast, cost-effective trenchless replacement of pressure pipelines (service and supply lines) from DN 50 to DN 400. Uses a quiet (<55 dB(A)) and vibration-free hydraulic pulling device to pull new pipes while simultaneously pressing out old brittle materials (gray cast iron, asbestos cement). Certified under DVGW GW 301 additional group GN 1. Sold to municipal utilities, public authorities, and industrial clients in Germany and Europe.
• Pipeline & Sewer Construction (Open-Trench Rohrleitungs- & Kanalbau) Construction of sewers, gas pipelines, water pipelines, and other pressure pipelines in all dimensions and pressure ranges, executed complete with the company's own qualified personnel and partly self-developed equipment. The traditional core competency of KARL WEISS, sold project-by-project to municipal utilities and public-sector clients.
• Special Civil & Ground Engineering (Ingenieur- & Spezialtiefbau) Special civil engineering services covering large bored piles, soldier pile walls (e.g., Berlin shoring), sheet piling, chords and stiffeners, dewatering and groundwater lowering, and complex excavation pit construction. Executed with the company's own equipment and qualified personnel, for public infrastructure, commercial, and industrial clients.
• Liquid Soil (Flüssigboden) Production and Installation

Quantifiable outcome

• Over 700 km of pressure pipelines rehabilitated using the starline® process since 1991
• +4 more outcomes

Named customers5 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

Four partnerships are on record, tiered core and minor.

• Berliner Wasserbetriebe (BWB)coreStrategic or Co-development PartnerKARL WEISS Technologies is a certified partner of Berliner Wasserbetriebe, Berlin's municipal water utility. The partnership involves pipeline construction, sewer network renovation, and specialized training through joint apprentice construction sites. This is a strategic partnership covering the company's primary regional market.
• IHK Berlin (Berlin Chamber of Industry and Commerce)minorOthersKARL WEISS Technologies works closely with IHK Berlin for vocational training and apprenticeship programs. The IHK Berlin has recognized the company's commitment to dual training.
• Fachgemeinschaft Bau (FG-Bau)minorOthersPartnership with the Berlin Construction Trade Association for vocational training and apprenticeship programs in the construction industry.
• DVGW (Deutscher Verein des Gas- und Wasserfaches e.V.)coreStrategic or Co-development PartnerDVGW is the German Technical and Scientific Association for Gas and Water. KARL WEISS Technologies holds DVGW certifications GW-301 and GW-302 and complies with DVGW regulations (GW 322-1, GW 325, W 270, VP 404) for its trenchless processes. DVGW certification is fundamental to market access for pipeline construction in Germany.

Scale indicators8 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Insituform Technologies (Aegion Corporation): US-headquartered global leader in CIPP pipe rehabilitation and corrosion protection, now part of Aegion. Broad incumbent serving municipal water and wastewater utilities with trenchless technologies overlapping KARL WEISS's rehabilitation offering.
• Herrenknecht AG: Global leader in mechanized tunneling and microtunneling based in Schwanau, Germany. Broad incumbent in underground infrastructure construction whose microtunneling and pipe-jacking systems overlap with KARL WEISS's special civil engineering and pipe jacking capabilities.

Direct peers

• Swietelsky-Faber GmbH: German subsidiary of Austrian Swietelsky AG specializing in trenchless pipe rehabilitation (Primus Line, sleeve technology) and sewer renovation. Direct competitor in the German trenchless rehabilitation market with comparable municipal utility customer base.
• Per Aarsleff A/S: Danish contractor specializing in pipe rehabilitation and foundation engineering across Northern Europe. Direct peer offering trenchless pipe renewal and special foundation works to municipal and industrial clients, with overlapping technology and customer profile.
• Brandenburger Liner GmbH & Co. KG: German CIPP liner manufacturer and installer specializing in UV-cured glass-fiber reinforced liners for sewer and pressure pipe rehabilitation. Direct regional competitor with comparable German utility customer base.
• TRACTO-TECHNIK GmbH: German specialist in trenchless technology for pipe installation and rehabilitation, offering Grundoram pipe ramming, Grundobore, and Grundocrack systems. Direct competitor in the German trenchless construction market with overlapping customer base in municipal utilities.
• SAERTEX multiCom GmbH: German manufacturer of CIPP (cured-in-place pipe) liner systems used for trenchless sewer and pressure pipe rehabilitation. Direct competitor in the German CIPP and trenchless rehabilitation market with overlapping municipal utility customers.
• RelineEurope GmbH: German-based provider of UV-cured GRP pipe liner systems for trenchless sewer and pressure pipe rehabilitation. Direct competitor offering an alternative CIPP technology platform to KARL WEISS's hydros® and starline® processes.

Emerging players

• Trelleborg AB: Swedish multinational providing engineered polymer solutions for infrastructure, including pipe seals and rehabilitation products. Emerging player in trenchless pipe rehabilitation technology, competing partially with KARL WEISS's pressure pipe renewal processes.

Regional players

• Bohlen & Doyen GmbH: German pipeline construction company (part of the Habau Group) with significant activity in northern Germany. Regional peer in open and trenchless pipeline construction serving gas, water, and district heating utilities across the German market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 KARL Weiss Technologies