Group Ceyssens

What Group Ceyssens does

Group Ceyssens nv is a privately held Belgian family-owned manufacturer of custom glass and aluminum window solutions, founded in 1965 in Heusden-Zolder and now in its second generation under Dirk Ceyssens. The company designs, produces, and installs high-end minimalist window systems, structural glazing, fire-resistant glass, renovation glazing, and specialty products such as the proprietary Air-lux hydraulic Carhouse system. Its flagship branded technology, KELLER minimal windows®, features ultra-fine aluminum profiles enabling glass surfaces up to approximately 4 meters in height with near-invisible framing. Group Ceyssens serves architects, project developers, contractors, and private end customers through a project-based direct sales model anchored by co-development during the design phase, an integrated in-house production facility, and a physical showhouse that demonstrates innovations including an 18-meter hydraulically lowering 'disappearing' window.

The company operates from a single headquarters in Heusden-Zolder, Belgium, and a regional office in Cogolin, Côte d'Azur, France (via the Csight sub-brand), with project references extending into the United Kingdom. Revenue is generated through quote-based, project-by-project sales of custom manufactured and installed glass systems; no SaaS, licensing, or recurring revenue streams are present, and no pricing is publicly disclosed. The business is differentiated less by technology breakthroughs than by integrated execution capability (design, fabrication, installation, service under one roof), 60 years of craftsmanship heritage, and a small number of proprietary systems (KELLER minimal windows®, Air-lux) supported by registered trademarks and a flagship demonstration facility. Recent strategic activity includes a 2025 Venice Biennale partnership for the Periscope House project and an expanding UK/France project footprint, signaling measured internationalization beyond the Belgian core market.

Name

Group Ceyssens

Legal name

Group Ceyssens nv

Website

https://groupceyssens.com

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

101–250 employees

Short description

Group Ceyssens is a Belgian family-run manufacturer (founded 1965) of custom high-end glass and aluminum window systems, serving architects, project developers, contractors, and private clients via in-house design, production, and installation.

Ownership category

akta.pro rank

Product category

Architectural Glass and Window Manufacturing

NAICS

Glass Product Manufacturing Made of Purchased Glass (327215), Metal Window and Door Manufacturing (332321), Glass and Glazing Contractors (23815)

SIC

Glass Products, Made Of Purchased Glass (3231), Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Architectural Glazing & Fenestration (Curtain Wall, Windows, Storefronts, Skylights) (IMAFAMAC)

akta.pro secondary industries

Architectural & Building Glazing Systems (Curtain Wall/Storefront/Canopies) (IMADAHAB), Skylights, Roof Glazing & Glass Roofing Systems (IMADAHAK)

Keywords

• Architectural glass solutions
• Minimal windows manufacturing
• Structural glazing systems
• Fire resistant glass
• Aluminium curtain walls

Headquarters

HQ city

Heusden

HQ country

Belgium

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Glass and Window Solutions: Design, production, and installation of custom minimalist windows, structural glazing, and glass products. Revenue generated through project-based sales to architects, developers, contractors, and private customers. Services include consultation, custom design, in-house manufacturing, and professional installation.
2. Carhouse Systems: Specialized glass garage/carport solutions with the proprietary Air-lux system for automatic glass panel operation.
3. Renovation Glass: Replacement of existing double glazing with high-efficiency glass while retaining existing window profiles. Targeted at energy renovation projects.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels9 records

Core offering

Group Ceyssens designs, manufactures, and installs custom high-end glass and aluminium window systems for residential, commercial, and architectural projects. Their portfolio spans minimalist frameless windows (KELLER minimal windows®), structural glazing, fire-resistant glass, interior glazing, renovation glazing, skylights, curtain walls, and the proprietary Air-lux Carhouse glass carport system.

Product overview

Group Ceyssens is an innovative, family-run Belgian glass and window solutions company founded in 1965. The product portfolio centers on custom high-end glass and aluminum systems organized around six core product lines: KELLER minimal windows® (ultra-slim profile minimalist windows up to 4m height, fixed or sliding), Exterior glass (double/triple glazing, structural glazing, sun protection, acoustic insulation), Interior glass (balustrades, shower screens, partitions, sliding walls, active glass), Fire resistant glass (fire-rated safety glass), Renovation glass (high-performance replacement glazing), and Carhouse (glass carport with Air-lux disappearing floor system). The offering is complemented by aluminum curtain wall systems, skylights, and façade cladding solutions. A dedicated sub-brand, Csight, serves the Côte d'Azur market. The company provides an all-in package spanning advice, custom design, in-house production, professional installation, and after-sales service. Projects range from individual villas and residential renovations to large-scale commercial and public buildings.

Differentiator

Problem solved

Functional benefit

Brands

• KELLER minimal windows®: Minimalist window system with ultra-fine profiles enabling fixed or sliding glass surfaces up to approximately 4 metres in height without obstructive profiles.

Products and services

• KELLER minimal windows® Minimalist window system with ultra-fine aluminium profiles enabling fixed or sliding glass surfaces up to 4 meters in height with nearly invisible framing. Integrates all glass types offered by the company.
• Exterior Glass Exterior glazing solutions including double and triple glazing, laminated safety glass, structural glazing, sun protection glass, acoustic insulation glass, and high-performance coated glazing for buildings.
• Interior Glass Interior glazing including glass balustrades, shower screens, glass doors, partitions, sliding glass walls, and switchable active (privacy) glass.
• Renovation Glass Replacement glazing service that swaps standard double glazing for high-performance glazing (U-value 1.1 to 0.6 W/m²K) while retaining the existing window profiles to improve insulation and energy efficiency.
• Fire Resistant Glass Fire-resistant safety glass that forms a heat shield and barrier against flames, smoke, and toxic fumes, applicable to interior and exterior glazing such as window panes, partition walls, fire doors, and glass floors.
• Carhouse Glass carport structure using the proprietary Air-lux system where large sliding glass panels open at the push of a button and recessed rails disappear into the floor, creating a flat driving surface.
• Aluminium Curtain Walls Aluminium curtain wall systems for large-volume glass projects, creating space and openness with structural bonded glazing and innovative design possibilities for commercial and residential developments.
• Skylights Glass roof structures made of high-quality glass and aluminium, replacing traditional polycarbonate domes with superior light penetration and high insulation values.

Quantifiable outcome

• High-efficiency glass (HR/HR++) provides U-values of 0.6-1.1 W/m²K compared to 2.9 for standard double glazing - up to 3-5x better insulation
• +2 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

One partnership is on record.

• Metamorphic Art Studio / Claerhout-Van Biervliet ArchitectsflagshipStrategic or Co-development Partner · 9 May 2025Partnership for the Periscope House project - an innovative underground residence with dynamically rising/falling mirror structures. Group Ceyssens provides glass solutions for this groundbreaking sustainable architecture project exhibited at the European Cultural Centre in Venice during the Architecture Biennale (May-November 2025). The project has won international awards and was named among 'The World's best Architecture in 2025' by Architizer.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Reynaers Aluminium: Belgian-headquartered manufacturer of aluminum windows, doors, sliding systems, and curtain walls. Operates in the same premium architectural glazing segment as Group Ceyssens across Belgium and broader Europe, with comparable focus on energy-efficient and minimalist systems.
• Schüco: German global leader in aluminum and steel systems for windows, doors, and façades. Directly competes with Group Ceyssens in curtain wall, structural glazing, and high-performance architectural envelopes across European commercial and residential projects.
• Sky-Frame: Swiss specialist in minimalist frameless sliding glass walls and large-format glazing. Closest direct competitor to Group Ceyssens' KELLER minimal windows® concept in the ultra-slim, maximum-transparency architectural segment.
• Vitrocsa: Swiss manufacturer of minimalist large-glass sliding windows with ultra-fine profiles. Competes head-to-head with Group Ceyssens in the premium minimalist residential and architectural glass segment.
• Solarlux: German manufacturer of glass folding/sliding walls, conservatories, and balustrade systems. Comparable to Group Ceyssens in custom architectural glazing projects across Europe, with overlap in glass extension and façade solutions.
• Technal: Aluminum architectural systems brand within the Saint-Gobain family, focused on curtain walls, windows, and sliding doors for commercial and residential construction. Overlaps directly with Group Ceyssens in European curtain wall and façade market.
• Aluprof: Polish aluminum systems manufacturer producing window, door, and façade profiles for European markets. Competes with Group Ceyssens in mid-range and premium architectural glazing, particularly in commercial and residential envelopes.
• Ponzio: Italian aluminum systems supplier for windows, doors, and curtain walls serving European construction projects. Comparable custom architectural glazing specialist with similar size and European regional focus.

Broad incumbents

• Saint-Gobain Glass: Global glass manufacturer and supplier serving European construction with flat glass, coated glass, and architectural glazing products. Major incumbent supplying both downstream competitors and acting as an upstream input provider to glass specialists like Group Ceyssens.
• AGC Glass Europe: Major European flat glass manufacturer producing architectural and high-performance coated glass for construction. Functions as both a key upstream glass supplier to fabricators like Group Ceyssens and a broad incumbent in European glazing markets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

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• Pinterestpinterest.com/groupceyssens

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Group Ceyssens