Loison

What Loison does

Loison S.A.S. is a French building metalwork company founded in 1959 and headquartered in Armentières, Hauts-de-France. The company operates four complementary core business lines: structural steel (charpente-structure métallique), steel joinery (serrurerie-menuiserie acier), aluminum facades (façades-menuiserie aluminium), and fire protection metalwork (menuiseries métalliques de protection incendie). It also develops innovative construction systems, including Dojo-NG® (a THPE-certified steel-frame dojo approved by the FFJDA), BBC-certified steel-frame residential housing, and modular buildings from recycled shipping containers. The company provides full vertical integration across four technical expertises: design (conception), manufacturing (fabrication), installation (pose), and maintenance, supported by a 17,000 m² industrial site with CNC-equipped workshops.

The company generates revenue through project-based contracts for the design, fabrication, and installation of metal construction works, with pricing determined on a per-project basis through competitive bidding for public procurement and direct negotiation for private-sector clients. Its customer base is evenly split between public markets (museums, government buildings, transit infrastructure, sports facilities) and private markets (hotels, retail centers, commercial buildings), with notable references including Louvre Lens, Hôtel Hilton Arc de Triomphe, Roland Garros, and the Hôtel de police de Lille. The go-to-market is direct enterprise field sales, with dedicated project managers assigned from conception through delivery.

Loison holds certifications that create meaningful barriers to entry: NF certification for fire-rated metal doors (one of only 3 French companies), nine Qualibat qualifications across all business lines, CE markings for automatic gates and curtain walls, and BBC/THPE certifications for sustainable construction. The company is family-owned, with Benoît Loison as President and Thibault Delepoulle as Directeur Général, with registered capital of €1,759,966. It employs 51-100 people and serves markets primarily across northern France including Hauts-de-France, Île-de-France, Normandie, and Pas-de-Calais.

Name

Loison

Legal name

LOISON S.A.S

Website

https://loison.eu

Company type

Private

Founded year

1959

Operating status

Operating

Headcount range

51–100 employees

Short description

Loison S.A.S. is a French building metalwork company founded in 1959, designing, manufacturing, and installing steel structures, aluminum facades, and fire protection metalwork for public and private construction projects across northern France.

Ownership category

akta.pro rank

Product category

Building Metalwork and Metal Construction

NAICS

Commercial and Institutional Building Construction (236220), Glass and Glazing Contractors (238150)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Frames, Sashes, Mullions & Subframes (IMADAIAH)

akta.pro secondary industries

Windows (IMADAIAC), Glazing Hardware, Sealants & Accessories (Spacers/Gaskets/Setting Blocks) (IMADAHAJ)

Keywords

• Building metalwork
• Structural steel fabrication
• Steel joinery installation
• Aluminum facade construction
• Fire-rated metalwork

Headquarters

HQ city

Armentières

HQ country

France

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Metal Construction Projects: Loison generates revenue through design, fabrication, and installation of metal construction projects including structural steel, aluminum facades, steel joinery, and fire protection systems. Revenue is project-based with each project individually scoped and quoted.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Loison is a French building metalwork company that designs, fabricates, installs, and maintains metal structures for the construction industry. It operates four complementary business lines — structural steel/charpente, steel joinery (serrurerie), aluminum façades (menuiserie alu), and fire-rated metal doors — delivering them under four technical expertises (Conception, Fabrication, Pose, Maintenance) for cultural, educational, sports, transport, government, hospitality, and retail projects across both public and private markets in France.

Product overview

Loison operates as a 'Creator of Metal Works' (Créateur d'Ouvrages Métalliques), a traditional metal construction company that does not offer a unified software platform. Instead, the company provides four complementary core business lines (Structure métallique/Charpente, Serrurerie/Menuiserie acier, Façades/Menuiserie alu, and Menuiseries métallique de protection incendie) supported by four technical expertises (Conception, Fabrication, Pose, and Maintenance). The company also develops innovative construction systems including Dojo-NG (next-generation steel dojos), Villavenir BBC steel houses, and modular buildings using recycled shipping containers. Projects span both public (50%) and private (50%) markets across culture, education, tertiary, sports, transportation, industry, and retail sectors.

Differentiator

Problem solved

Functional benefit

Products and services

• Structure métallique // Charpente (Structural Steel) Design, fabrication, and installation of steel framing and structural metal works for collective equipment, tertiary-sector buildings, and specific structures such as pylons and footbridges. Served through a 3,000 m² dedicated Charpente-Structure métallique workshop.
• Serrurerie // Menuiserie acier (Steel Joinery) Design, fabrication, and installation of building metalwork including stairs, guardrails, handrails, decorative ironwork, brise-soleil, sheet and fire-rated glazed doors, plus steel, stainless steel, brass, or copper windows and skylights. Produced in a 2,000 m² Serrurerie-Menuiserie acier-Protection incendie workshop.
• Façades // Menuiserie alu (Aluminum Façades and Curtain Walls) Design and optimization of thermal, acoustic, aesthetic, and dimensional characteristics of glazed walls for façades, including curtain walls, windows, French windows, exterior insulation, and glazing. Produced in a 1,500 m² Façades-Menuiserie aluminium workshop.
• Menuiseries métallique de protection incendie (Fire-rated Metal Doors) Design, fabrication, and installation of sheet and glazed fire-rated (coupe-feu) metalwork products. Loison is one of only three French companies certified NF for fire protection metalwork products.
• Dojo-NG (Nouvelle Génération) Steel-frame Dojo System Proprietary next-generation steel-frame dojo construction system approved by the French Judo Federation (FFJDA), featuring THPE (Très Haute Performance Énergétique) label as standard and an optional BBC (Low Energy Building) version with renewable energies. Designed for rapid deployment and eco-friendly construction of judo training facilities across France.
• Villavenir BBC Steel House Individual BBC (Bâtiment Basse Consommation / Low Energy Building) certified steel-frame house accessible to the general public, exceeding current sustainable development regulations. Features metal framework, integrated solar thermal panels, gas condensing boiler, aluminum windows with disabled-access threshold, insulated exterior cladding, and double-glazed windows. The Villavenir project in Loos-en-Gohelle delivered 6 such housing units.
• Recycled Container Modular Housing THPE-certified modular building system based on recycling end-of-life shipping containers into habitable structures, providing an economic solution with very short execution times. Each unit delivers 28 m² of habitable surface. Specifically deployed for university student housing under the French 'Plan Université' program.
• Maintenance d'ouvrages (Maintenance of Metal Structures) Professional maintenance services for steel locksmithing and aluminum façade work, covering regulatory compliance for public buildings, fire safety, accessibility for disabled persons (PMR), maintenance contracts, and emergency repairs.

Quantifiable outcome

• One of 3 French companies certified NF for fire protection metalwork
• +1 more outcomes

Named customers13 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

Feature3 records

Partnerships

One partnership is on record.

• Fédération Française de Judo®coreStrategic or Co-development PartnerFédération Française de Judo® approved the Dojo-NG® system, a new generation of steel-frame ecological dojo. Loison developed this innovative construction system specifically for judo training facilities, receiving official federation endorsement and certification for use across France.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Léon Grosse: Large diversified French construction group with a substantial metalwork and structural steel business unit, competing with Loison on medium and large nonresidential tenders across France.
• Spie batignolles: Diversified French construction group with a metalwork arm serving public infrastructure and commercial builds — a broader incumbent whose offerings overlap with Loison's charpente métallique and serrurerie lines.
• Eiffage Construction: Major French construction incumbent with extensive metalwork and structural steel capabilities through its Métal division, competing on the same institutional and commercial project pool as Loison.
• Fayat Metal: Metalwork division of the Fayat Group, one of France's largest privately owned construction groups — broader portfolio but directly competes in structural steel, facades, and metalwork.

Emerging players

• SNMS (Société Nouvelle de Montage et Structures): Mid-sized French metalwork contractor specializing in industrial and commercial steel structures — a comparable regional metalwork peer with similar service scope and customer types.

Direct peers

• Castel & Fromaget: French specialist metalwork contractor covering structural steel, locksmithing/metalwork, and facades for public and private clients — a direct competitor in Loison's niche across similar project types.
• SIB (Société Industrielle du Bâtiment): French metalwork contractor specializing in structural steel, metal joinery, and envelope systems for nonresidential buildings — directly overlapping with Loison's charpente and serrurerie lines.
• Pignon: Northern-French metalwork and structural steel firm serving public and private construction with comparable offerings in charpente, serrurerie, and façades — directly comparable to Loison's footprint and customer mix.
• Baudin Châteauneuf: Major French metalwork and structural steel contractor operating nationally, offering design, fabrication, and installation of steel structures, facades, and heritage metalwork — closely mirroring Loison's core four-métier model but at significantly larger scale.

Regional players

• Charpentes Métalliques de l'Atlantique: Western France-based structural steel and metalwork contractor comparable in size and offerings to Loison — competing for similar tenders but geographically distinct from Loison's Northern France base.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/loison

Compliance21 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Loison