The largest construction companies in Luxembourg include a mix of large international groups and mid-sized local firms. Jan De Nul Group provides engineering solutions for rising sea levels and energy transition, while C.A.T. Group is an integrated EPC contractor for oil & gas and civil construction. ELCO specializes in electrical installations and facility management, and SOCOM SA designs and maintains electrical, mechanical, and communication network systems. Groupe COSTANTINI offers multidisciplinary construction services, and Luxcontrol provides safety, health, and environmental compliance services.
The companies listed are primarily involved in various aspects of construction, from large-scale infrastructure projects to specialized building services. A notable pattern is the concentration of headquarters in and around Luxembourg City, with additional presences in towns like Capellen, Kehlen, and Foetz, reflecting the country's compact geography and centralized economic activity. Many of these firms were founded between the 1970s and 1980s.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Jan De Nul Groupjandenul.com
Engineering solutions addressing rising sea levels, energy transition, and soil pollution to improve global quality of life sustainably. |
6,391 | |||
| 2 |
C.A.T. Groupcat.me
Integrated EPC contractor in engineering, procurement, and construction services for oil & gas, civil construction, and infrastructure projects across MEA region Headquarters in Luxembourg |
3,499 | |||
| 3 | 398 | ||||
| 4 | 377 | ||||
| 5 |
Groupe COSTANTINIcostantini.eu
Multidisciplinary construction company offering civil engineering, general contracting, real estate development, demolition, asbestos removal, and electrical services in Luxembourg and France. |
327 | |||
| 6 |
Luxcontrolluxcontrol.com
Luxcontrol offers safety, health, environmental, and product quality services to help clients comply with regulations They aim to build a safer world with a team of 250 experts |
210 | |||
| 7 |
Kyoteckyotecgroup.com
Specialist in complex, multi-material building envelopes focusing on energy-efficient façades for large-scale architectural and environmental projects. |
190 | |||
| 8 |
Genistagenista.lu
Genista offers a complete range of construction services, including heating, sanitation, security, electrical works, and renewable energy solutions for both residential and commercial projects |
185 | |||
| 9 |
SOLUDECsoludec.lu
Soludec SA is a leading construction company in Luxembourg, specializing in building, civil engineering, and real estate development with high energy efficiency standards |
181 | |||
| 10 |
Verisetveriset.ch
Veriset creates joy in living through innovative Swiss kitchen designs that blend functionality, quality, and aesthetics to meet individual needs and desires |
165 | |||
| 11 |
MERSCH & SCHMITZ Production S.à r.lmersch-schmitz.lu
A leading technical contractor in Luxembourg, offering MEP engineering, installation, maintenance, and energy services for residential, commercial, and mixed-use developments |
163 | |||
| 12 |
Paul Wagner et Fils SApwagner.lu
A leading provider of technical building services in Luxembourg, offering a range of services from consultation and planning to execution and maintenance with a team of 300 employees |
163 | |||
| 13 |
CDCL Compagnie De Construction Luxembourgeoisecdclux.com
Major player in Luxembourg specialized in residential, industrial, commercial, and civil engineering construction, combining expertise with innovative solutions since 1979 |
129 | |||
| 14 |
Solelec (Equans)equans.lu
Luxembourg-based engineering company specializing in electrical installations and low-voltage system integration for industrial, energy, building, and infrastructure markets Offers expertise in various technical disciplines |
128 | |||
| 15 |
Soclair Equipements SAsoclair.lu
Soclair Equipements SA is a company based in Luxembourg that specializes in equipment and machinery |
111 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Steel Shedgroup-3s.com
Sales of DIY metal building kits for customers to assemble themselves, promoting teamwork, learning, and passion in a growing company. |
101 | |||
| 17 |
Bétons Feidt S.Abetonsfeidt.lu
A leading concrete manufacturer in Luxembourg and the Greater Region, offering a wide range of ready-mix concretes and prefabricated products to meet various construction needs |
69 | |||
| 18 |
KUHN CONSTRUCTION S.A.kuhn.lu
An established construction and real estate company since 1897, specializing in diverse building services, renewable energy, and social responsibility initiatives |
58 | |||
| 19 | 30 | ||||
| 20 |
Willy Putzwilly-putz.lu
Offering a wide range of services including plumbing, tiling, carpentry, kitchens, and renovations with a dedicated project manager overseeing from start to finish |
30 | |||
| 21 |
D METAL S.A.dmetal.eu
A family-owned company specializing in metal joinery and glass facade construction Serving individuals and private/public businesses with personalized quality services since 2017 |
24 | |||
| 22 |
AQUATECHNIC S.A.aquatechnic.lu
An artisanal family business specializing in sanitary and climate equipment installation and maintenance, offering additional services like custom bathrooms and kitchens |
24 | |||
| 23 |
Sopiconcept S.A.sopiconcept.lu
Construction company specializing in all building trades for private individuals and developers Certified for passive constructions, involved from conception to completion |
12 | |||
| 24 |
VALFIDUSvalfidus.com
Family-owned group focused on innovation, entrepreneurship, passion, and long-term personal commitment to clients, partners, and staff. |
10 | |||
| 25 |
Team Schrammteamschramm.com
Certified craftsmanship company offering comprehensive services in heating, ventilation, plumbing, and electrical systems including installation, maintenance, and design solutions for residential properties |
7 | |||
| 26 |
de Buedemleërd-b.lu
Family business specializing in floor coverings, curtains, and blinds Offers a wide range of products for renovation or construction projects |
7 | |||
| 27 |
BC Fermeturebc-fermeture.com
Specialized in PVC, wood, and aluminum carpentry, with decades of experience, providing installation services with in-house teams |
6 | |||
| 28 |
FWD building solutions SAfwd-building-solutions.lu
Specializing in interior finishing in Luxembourg, offering drywall, ceilings, and acoustic solutions Committed to quality, efficiency, and client satisfaction for over 27 years |
6 | |||
| 29 |
tolesmoinscheres.comtolesmoinscheres.com
Our group, based in Luxembourg, offers budget-friendly products through tolesmoinscherescom Stay updated on our brands and job opportunities on LinkedIn |
4 | |||
| 30 |
WANSART CONSTRUCTION ET RENOVATION DURABLEwansart.lu
A family-owned construction company specializing in sustainable, energy-efficient homes and renovations, focused on quality, service, and ecological principles in building practices |
2 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
More company lists in Luxembourg
- The largest companies in Luxembourg 799
- Multinational companies in Luxembourg 340
- Financial services firms in Luxembourg 255
- Financial Services companies in Luxembourg 171
- Critical infrastructure operators in Luxembourg 79
- Investment Management companies in Luxembourg 75
- Venture capital and private equity firms in Luxembourg 71
- Manufacturers in Luxembourg 59
- Professional services firms in Luxembourg 56
- Companies with in-house R&D in Luxembourg 55
- IT Services and IT Consulting companies in Luxembourg 42
- SaaS companies in Luxembourg 41
- Corporate groups and holding companies in Luxembourg 39
- Consulting firms in Luxembourg 37
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- IT services companies in Luxembourg 37
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- Banking companies in Luxembourg 34
- Public sector organisations in Luxembourg 34
- Family-owned companies in Luxembourg 32
- Logistics companies in Luxembourg 31
- Transportation, Logistics, Supply Chain and Storage companies in Luxembourg 30
- Insurance companies in Luxembourg 29
- Hardware manufacturers in Luxembourg 28