What CASS does

CASS Construction And Steel Structures Sp. z o.o. is a Polish privately held steel construction manufacturer and contractor founded in 2013 by Grzegorz Krupa and Tom Versteijlen and headquartered in Grzybów (Staszów Economic Zone, Świętokrzyskie Voivodeship). The company designs, fabricates, and assembles heavy steel structures, including large fuel storage tanks of approximately 20,000 m³ capacity in black or stainless steel, offshore wind turbine components, steel bridges, pipelines for industrial sites, modular steel halls, and ancillary metalwork such as railings, ladders, and sandwich panels. Manufacturing is concentrated at the Grzybów workshop, which houses a VERNET Behringer HD-X/HD-S three-axis CNC cutting/drilling/milling line, a STILER JTB 50 mandrel-free bender, and a CORMAK MCB350HD bandsaw, with welding performed under methods 121, 135, 136, 138, and 141.

The business operates in two integrated modes: factory-based manufacturing of steel structural elements certified to EN 1090-1:2009+A1:2011 and welded under EN 1090-2:2018 (method 135 qualification issued February 6, 2024), and on-site assembly services delivered by multilingual foremen (English, Dutch, French). Projects are executed as project-based contracts with industrial, energy, fuel, and government clients in Poland, Belgium, the Netherlands, the United Kingdom (Canvey Island), Romania, and France; the company's European Parliament (Brussels, 2013-2015) and Antwerp offshore wind projects established its reputation in Benelux. End markets are fuel and energy (tanks and pipelines), renewable energy (offshore wind), construction/civil engineering (halls and bridges), and industrial pipeline infrastructure, with primary ownership remaining with the two co-founders and no external institutional capital disclosed.

Revenue is generated entirely through one-time project contracts (no recurring subscription, licensing, or platform revenue model), with over 800 projects completed since founding and a workforce that has grown from roughly a dozen to more than 200 employees. The go-to-market is direct enterprise and project-based sales via phone (+48 15 865 53 04) and email ([email protected]), supported by a website, social media (Facebook, Instagram), local PR, recruitment channels, and event sponsorship; customers are reached either as an independent subcontractor or in cooperation with general contractors.

Name

CASS

Legal name

CASS Construction And Steel Structures Sp. z o.o.

Website

https://cass.com.pl

Company type

Private

Founded year

2013

Operating status

Operating

Headcount range

101–250 employees

Short description

CASS is a Polish steel construction manufacturer and subcontractor (founded 2013, 200+ employees, Grzybów) that fabricates and assembles large fuel tanks, offshore wind turbine structures, steel bridges, pipelines, and modular steel halls for industrial, energy, and government clients in Poland, Belgium, the Netherlands, the UK, Romania, and France.

Ownership category

akta.pro rank

Product category

Industrial Steel Construction Services

NAICS

Fabricated Structural Metal Manufacturing (332312), Plate Work Manufacturing (332313)

SIC

Fabricated Structural Metal Products (3440), Miscellaneous Fabricated Metal Products (3490)

akta.pro primary industry

Metals & Steel Mill Facility Construction (IMAFADAF)

akta.pro secondary industry

Steelwork & Fabrication Facilities (Plate/Section Processing, Welding Lines) (IMAJALAH)

Keywords

• Steel structure fabrication
• Industrial construction services
• Offshore wind assembly
• Metal tank construction
• Structural steel engineering

Headquarters

HQ city

Staszów

HQ country

Poland

HQ region

Europe

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Steel Structure Manufacturing and Assembly: CASS manufactures steel structural elements at its Grzybów workshop and provides on-site assembly services. Products include steel structures for refineries, power plants, workshops, barriers, manhole ladders, and other industrial steel elements. Assembly services are offered in Poland and abroad with multilingual foremen (English, Dutch, French). Revenue is earned through project-based contracts with industrial clients, contractors, and general construction firms.
2. Tank Construction Services: Construction of large fuel tanks (approx. 20,000 m3 capacity) in black or stainless steel at European ports. Includes renovation and maintenance of existing tanks. Revenue generated through project contracts with energy and fuel industry clients.
3. Offshore Wind Turbine Construction: Construction and assembly services for offshore wind turbines in Belgium, the Netherlands, and Poland. Active in the offshore industry since 2017. Revenue from project-based contracts with renewable energy clients.
4. Bridge Construction: Construction of steel bridges, primarily in Belgium, with a focus on both classic and modern design projects. Revenue from project contracts in the civil engineering sector.
5. Pipeline Construction: Construction of pipeline elements and full installations for various industries at workshops and construction sites in Belgium. Qualified welders and fitters who read isometric drawings perform the work. Revenue from project-based industrial contracts.
6. Modular Steel Halls: New product line offering modular steel halls for warehouses, manufacturing, logistics centers, and agriculture. Sold as an innovative solution with quick assembly and scalability. Revenue from direct sales to business clients.
7. Other Metal Products (Barriers, Ladders, Sandwich Panels): Production and assembly of metal railings, ladders, and sandwich panel installation services. Products manufactured at the Grzybów workshop. Revenue from project-based service contracts.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

CASS is a Polish manufacturer and contractor of steel structures, producing and assembling industrial steel components at its Grzybów workshop and on client sites across Europe. Its portfolio spans structural steel for refineries and power plants, large fuel storage tanks (~20,000 m³), offshore wind turbine components, steel bridges, industrial pipelines, modular steel halls, and ancillary metalwork such as railings, ladders, and sandwich panels. The company combines in-house CNC-enabled production with multilingual on-site assembly crews to deliver turnkey projects to industrial, energy, and government clients.

Product overview

CASS Construction And Steel Structures is a Polish steel construction manufacturer and contractor offering a unified portfolio of steel structure products and services. The core offering includes steel structures, tanks, windmills, bridges, and pipelines manufactured at their Grzybów facility and assembled at client sites. These products are complemented by modular steel halls (new product) and ancillary metal elements (railings, ladders, sandwich panels). The company operates both as a manufacturer (since 2022 in new Grzybów facility) and as an assembly contractor serving clients in Poland and across Europe.

Differentiator

Problem solved

Functional benefit

Products and services

• Steel Structures (Konstrukcje Stalowe) Production and assembly of industrial steel structures including refinery canopies, power plant structures, halls, barriers, and manhole ladders for industrial and construction clients.
• Tanks (Zbiorniki) Construction of large fuel storage tanks (~20,000 m³ capacity) in black or stainless steel, including new build, renovation, maintenance, and tightness testing at European port locations.
• Windmills (Wiatraki) Construction and assembly services for offshore wind turbines in Poland, the Netherlands, and Belgium, serving renewable energy clients.
• Bridges (Mosty) Construction of steel bridges in both classic and modern designs, primarily for Belgian civil engineering clients and other European markets.
• Pipelines (Rurociągi) Construction of pipeline elements and complete installations for various industries, executed by qualified welders and fitters who read isometric drawings.
• Other Metal Elements Production and assembly of ancillary metal products including railings, ladders, and sandwich panel installation, manufactured at the Grzybów workshop.
• Modular Steel Halls (Stalowe Hale Modułowe) Prefabricated modular steel buildings designed for rapid assembly and scalability, offered to warehousing, manufacturing, logistics, and agriculture clients.
• Steel Structure Assembly Services Professional on-site assembly of steel structures at client locations in Poland and abroad, with multilingual coordination and equipment operators.

Quantifiable outcome

• Over 800 projects completed in Poland and abroad since 2013
• +3 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Five partnerships are on record, tiered minor and core.

• Town Hall in StaszówminorOthers · 1 January 2023CASS manufactured and installed the supporting structure for the roof of the town hall in Staszów, Poland in 2023. This local project was produced at the Grzybów facility and represents CASS's growing local market activity in Poland.
• Fuel Industry Clients (UK, Romania, France, Belgium, Netherlands)coreOthers · 1 January 2018CASS works with fuel and energy industry clients across Europe, constructing large fuel storage tanks (~20,000 m3 capacity) at various port locations in the UK (Canvey Island), Romania, France, Belgium, and the Netherlands. Tank renovation and maintenance services are also provided.
• Industrial Clients in Belgium (Ghent Hall, Aalst Hall)minorOthers · 1 January 2018CASS completed steel hall construction projects in Ghent (2018) and Aalst (2020), Belgium, for industrial clients. These projects demonstrate CASS's presence in the Belgian industrial construction market.
• Polish and Foreign Wind Energy ClientscoreOthers · 1 January 2016CASS has partnered with Polish and international clients in the offshore wind sector since 2017. Projects include wind turbine construction in Poland, the Netherlands, and Belgium. This partnership has been ongoing and represents a key growth area for the company.
• European Parliament / EU Institutions (Brussels project)coreOthers · 1 January 2013CASS participated in the construction of the European Parliament building in Brussels (2013–2015) as a steel structure contractor. This was the company's first large international project and established its reputation as a recognized player in the Belgian market, enabling further expansion across Europe.

Scale indicators7 records

Recent moves7 records

Expansion highlights6 records

Broad incumbents

• Royal BAM Group: Large Dutch construction and engineering group active across buildings, infrastructure, and offshore. Overlaps with CASS in industrial steelwork and offshore construction but operates at prime-contractor scale across the full construction value chain.

Direct peers

• Voortman Steel Group: Dutch manufacturer of steel processing machinery and fabricator of structural steel products. Comparable to CASS in steel structural fabrication with European footprint and CNC-driven production.
• Bladt Industries: Danish manufacturer of offshore wind foundations and large steel structures. Comparable to CASS in offshore wind fabrication (transition pieces, monopiles) and similar specialized steel structure scope.
• Sif Group: Netherlands-based manufacturer of monopiles and heavy steel foundations for offshore wind. Comparable to CASS on the offshore wind steel-supply axis, though at substantially larger scale.
• Smulders: Belgian steel construction group specializing in offshore wind foundations, jackets, and heavy industrial steel structures. Directly comparable to CASS in the offshore wind and heavy-port steelwork segments and operating in the same Belgium/Netherlands geography.
• EEW SPC: German specialist in large-diameter steel pipe and offshore wind monopile fabrication. Comparable to CASS on heavy-welded steel fabrication for the offshore wind segment.
• William Hare Group: UK-based structural steel fabricator and erector serving commercial buildings, infrastructure, and industrial projects. Comparable to CASS on steel-structure manufacturing plus on-site assembly business model.
• Severfield plc: UK-listed structural steel fabricator and erector serving commercial, industrial, and infrastructure projects across the UK and Europe. Most directly comparable to CASS on the structural steelwork scope (commercial/industrial buildings, bridges, offshore-related fabrication).

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/cassconstructionpoland
• Instagraminstagram.com/cassconstructionpoland
• LinkedInlinkedin.com/company/cass-construction-and-steel-structures

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 CASS