VELUX: roof windows & accessories

Reference document: roof covering

This file allows you to:

• Understanding the differences between the main roofing materials
• Choose a roof covering that suits your region, your building and your needs
• Estimate the cost of a new roof or renovation project
• Identify financial aid available for roofing work
• Understanding the criteria that influence the durability, maintenance, and performance of a roof
• Explore brands, articles and news dedicated to roofing

 

👉 Reference document: roof covering

 

A story of innovation in the service of light and comfort

For over 80 years, the Velux brand has established itself as the international benchmark in the field of roof windows and loft conversions. From its Danish beginnings in 1941, to technological advancements in pivot hinges, or its recent innovations (such as triple glazing or the integration of home automation solutions), Velux embodies modernity, reliability, and creativity in the construction industry.

This article, both technical and educational , revisits the history of Velux , describes its evolution, explains its product catalog, and highlights the solutions it offers to improve light, ventilation, and thermal comfort in buildings. We will also examine Velux's place in contemporary architecture and see how its roof windows meet new requirements for energy efficiency and sustainable design.

To guide this exploration, we will cover the following topics:

• Root : genesis of the brand, foundation and philosophy.
• Historical branches : international expansion, significant innovations, entry into the French market.
• Product branches : the range of roof windows, light conduits, flat roof solutions, blinds and roller shutters, etc.
• Technical branches : differences between pivot and projection windows, recent innovations, energy and acoustic performance.
• Branches of use : implementation advice, advantages for renovation and new construction, architectural impacts.
• Prospective branches : integration of new technologies, home automation, comfort and health issues.

The objective is clear: to inform and persuade professionals and experts in the construction sector of the benefits of turning to Velux solutions, while highlighting the variety of products available and the positive feedback from millions of users around the world.

1. Historical roots: the genesis of Velux

1.1. Danish origins

The Velux story began in 1941 with the vision of a Danish engineer, Villum Kann Rasmussen . At the time, many buildings (schools, homes) made poor use of the space under roofs or attics, and the concept of the roof window was still in its infancy. Rasmussen then designed a first window that would bring both natural light and effective ventilation into rooms that were previously dark and poorly ventilated.

The choice of the name “Velux” is not insignificant:

• “VE” refers to the ventilation, a crucial issue for comfort and health
• “LUX” takes the Latin term for "light", a symbol of openness and well-being

The Velux brand was officially registered in October 1942. Villum Kann Rasmussen then surrounded himself with R&D teams to refine the concept and develop simple, robust, and easy-to-install technical solutions.

1.2. The first innovation: Hinge-Pivot

In 1945, just a few years after the brand's creation, Velux introduced a revolutionary feature for its time: the pivot hinge . This patented system allows the roof window to pivot on its axis , providing easy access for cleaning and maintenance. The idea was to make life easier for occupants while also improving safety.

This initial step forward marked the starting point of a long series of innovations that would define the brand's DNA. Velux is not just a manufacturer, it is a pioneer laying the foundations for a new market: that of the modern, reliable roof window adapted to the Nordic climate (exposure to wind, rain, and snow).

2. Historical branches: expansion and establishment

2.1. Difficult beginnings in France

France is now one of Velux's main markets, but the brand initially met with a mixed reception when it established itself there in 1964. French tradition at the time favoured dormer windows or skylights to illuminate attics, and the idea of ​​large pivoting roof windows seemed disruptive and not in line with habits.

This landmark project made all the difference: in 1968, the Avoriaz ski resort opted for the widespread installation of Velux windows in its buildings. The result: attics bathed in light and significantly improved comfort for vacationers. This success contributed to Velux's reputation throughout France and paved the way for the gradual adoption of roof windows in new construction and renovations.

2.2. International development

The successes in Scandinavia and France were just a prelude to Velux's expansion into European and then global markets. The brand developed subsidiaries and forged partnerships to adapt to local regulations (fire resistance, thermal standards, CE certification, etc.).

Over the years, Velux has become an undisputed leader in the field of roof windows, strengthening its presence in the United States, Asia, and other regions where attic conversions are becoming more widespread. The company invests heavily in research on glazing ( double, triple, solar control), home automation (motorization, rain sensors), and integrated solutions (blinds, roller shutters).

Reference file: exterior joinery

This file allows you to:

• Understanding the role of exterior carpentry in the insulation, comfort and safety of the building
• Compare the main materials and technologies available (PVC, aluminum, wood and mixed solutions)
• Understanding regulatory requirements and issues related to energy performance
• Discover market trends, innovations and new technical solutions
• Explore brands, articles and news dedicated to exterior joinery

👉 Reference file: exterior joinery

3. Product branches: the Velux range in detail

3.1. Roof windows

3.1.1. Rotating windows

• Flagship models : GGL, GGU
• Characteristics : opening around a central axis, handle at the top, easy maintenance (the window can pivot up to 180° to clean the exterior glass)
• Adaptation : ideal for roofs from 15° to 90°, suitable for attics with a little ceiling height and for standard use
• Benefits : price often more affordable than projection windows, practical interior accessibility, wide choice of dimensions

This solution is particularly popular for attics or rooms where you want to place furniture under the window without obstructing the opening.

3.1.2. Projection windows

• Flagship models : GPL, GPU
• Characteristics : opening outwards, generally up to 45°, handle at the bottom, panoramic view
• Adaptation : roofs from 15° to 55°, best suited to configurations where you can stand directly in front of the window
• Benefits : better view, increased ventilation, feeling of space in the room, high-end appearance

These models are approximately 30% more expensive than pivot windows, due to their more sophisticated mechanism and generally higher-quality materials. However, they offer greater comfort (viewing the landscape, air renewal) and often a more contemporary design.

3.1.3. Flat roof windows

• Usage : modern extensions, flat-roofed buildings, renovation of individual houses
• Performances : optimized thermal and acoustic insulation (double or triple glazing), reinforced sealing to prevent any infiltration
• Distinctive features : often equipped with an acrylic dome, curved or flat glazing, possibility of integrating exterior roller shutters

This category responds to the architectural trend of contemporary buildings, often with flat roofs, which require a supply of natural light as effective as in a pitched roof.

3.2. Light conduits (Sun Tunnel)

Velux Sun Tunnels allow natural light to enter rooms located away from the facades (hallway, central bathroom, dressing room). A reflective tube connects the roof (where a sensor is placed) to the ceiling of the interior room, maximizing light transmission.

This product is particularly popular for renovations , where the goal is to avoid major roof openings while still benefiting from natural light. Construction professionals emphasize its ease of installation, provided that the sealing and orientation guidelines are strictly followed.

3.3. Blinds and roller shutters

• Stores : available in blackout, filtering, Venetian versions, etc. They allow you to modulate the light while adding an aesthetic touch to the roof window
• Roller shutters : they optimize energy efficiency by reducing heat loss in winter and overheating in summer. Some motorized shutters can be programmed to close or open automatically, depending on the indoor temperature or sunlight

Several studies show that adding a Velux roller shutter can significantly reduce the indoor temperature in summer, offering up to 7°C less in the attic compared to an unequipped roof window.

3.4. Motorized windows and connected products

3.4.1. Velux Integra

• Benefits : electric or solar control, rain detector (automatic closing in the event of downpours), remote control
• Targets : ideal for windows that are difficult to access (high ceiling height) or for users seeking maximum user comfort

3.4.2. Velux Active

• Features : smart air quality control, CO₂, temperature and humidity measurements, smartphone app for remote control
• Stakes : integration into the automation overall building, improving health and energy performance

4. Technical branches: distinctions and innovations

4.1. Pivoting windows vs. tilting windows

The choice between these two types depends on the desired comfort level , the roof configuration , the frequency of use , and the budget . Architects and construction professionals often guide their clients towards a top-hung window if the view is strategic (mountains, sea, cityscape), or towards a pivoting window if the main objective is to increase natural light and ventilation.

4.2. Glazing and energy performance

Velux offers a range of glazing options to adapt to climatic constraints:

• Standard double glazing : good compromise between thermal and sound insulation and cost
• Triple glazing : recommended in very cold regions (mountains, northern Europe) or for passive constructions
• Solar control : limits internal overheating in summer thanks to a reduced solar factor, while guaranteeing good brightness

Acoustic insulation is also taken into account. Certain specific glazing significantly reduces external noise, an essential criterion when the roof window is close to an airport, a busy road or in a dense urban area.

4.3. Waterproofing and installation quality

Installing a Velux roof window requires particular attention to ensure a watertight seal . Professionals must strictly adhere to the manufacturer's recommendations regarding the header, flashing connections, and surrounding tiles or slates.

Proper installation determines not only the window's lifespan , but also its thermal and acoustic performance . Water leaks or drafts can compromise an entire renovation or new construction project.

5. Branches of use: what benefits for professionals and occupants?

5.1. Renovation: transforming an attic into a living space

One of the major reasons for Velux's success is attic renovation . Thousands of older buildings (houses, farmhouses, apartment buildings) have unused or uninviting attic spaces. Installing one or more Velux roof windows can radically transform these areas, making them habitable, bright, and pleasant.

The advantages for construction professionals are numerous:

1. Added value : converting an attic into a bedroom, office or games room increases the real estate value of the building
2. Timeliness : installing a roof window can be done quickly, provided that the frame and roofing are in good condition
3. Thermal issues : renovated attics must comply with current insulation standards (RT 2012, RE 2020), and Velux offers suitable solutions to limit thermal bridges

5.2. New construction: optimizing light and comfort

In a new construction project , the integration of roof windows is often considered from the design stage. Architects take care to orient these openings to maximize solar gain and ensure summer comfort (limiting overheating).

Velux solutions, particularly top- hung and top-hung windows , can be combined to create multiple skylights. Staggered placement or grouping (2-in-1 or 3-in-1 windows) results in very bright interiors , approaching the standards of a loft or a room with large windows.

5.3. HQE, BBC, Passivhaus approach

Low-energy buildings ( BBC), HQE (High Environmental Quality) or Passivhaus projects place great importance on managing solar gain and natural ventilation . Velux windows, combined with smart roller shutters and triple glazing, can limit energy consumption in winter (reducing heating needs) while avoiding the systematic use of air conditioning in summer.

Thanks to Velux Integra motors and the Velux Active solution, night ventilation can be controlled automatically to naturally cool the interior, a feature prized in passive houses where summer overheating is a recurring concern.

6. Prospective branches: innovations and future trends

6.1. Connected technologies and home automation

Home automation is evolving rapidly. Occupants are looking for solutions that can self-manage , communicate with other elements in the home (heating, air conditioning, alarm, etc.), and maintain a healthy environment . Velux Active is part of this trend:

• Sensors measure the temperature, the humidity and the CO₂
• An algorithm decides whether to open or close the window, shutter or blind, depending on the weather and user preferences
• The smartphone application allows remote control and the receipt of alerts (automatic closing in case of rain, for example)

This type of innovation fits perfectly into the rise of smart buildings and meets growing expectations in terms of comfort, personalization and energy optimization.

6.2. Advanced skylights and smart windows

Beyond roof windows, Velux is investing in research on more efficient light pipes (improved reflectivity, variable diffusion options). The idea is to provide natural light in rooms without a facade, while regulating temperature and glare.

The emergence of electrochromic or controlled-opacity glass could also happen in the Velux catalogue, allowing the glass to be tinted automatically according to the sunlight, or even to modulate the transparency to preserve privacy.

6.3. Eco-design and life cycle

Sustainable construction also involves considering the ecological footprint of products. Velux is already striving to limit the impact of its windows, through the use of certified wood (FSC or PEFC), recyclable aluminum, or metal oxide glazing.

A high-performance roof window should have a positive energy balance : that is, it should save more energy (by reducing the need for artificial lighting and heating) than it took to manufacture. Environmental labels and certifications highlight these principles, and Velux subscribes to them to promote its products within the context of ecological transition.

7. Advice for construction professionals

7.1. Choosing the right roof window

• Roof slope : accurately assess the angle (in degrees) to determine whether to opt for a rotating window (15° to 90°) or a projecting window (15° to 55°)
• Installation height : a window accessible by hand or requiring motorization?
• Sunshine : southern exposure to maximize light, but provide protection (blinds, shutters) to avoid summer overheating
• Budget : take into account not only the purchase price, but also the installation cost and any interior finishes (cladding, fittings, insulation)

7.2. Respect the sealing and safety rules

• Header and structure : check compatibility with the framework and the condition of the roof
• Local standards and regulations : in certain cases, the installation of a roof window may require a prior declaration of work, or even a building permit (protected areas, historic monuments)
• Construction site safety : provide scaffolding or fall protection equipment for working on the roof

7.3. Optimizing interior comfort

• Peripheral insulation : seal around the window to eliminate thermal bridges
• Blinds and shutters : recommend an interior blind that filters or blacks out depending on the use of the room (bedroom, office). Add a roller shutter to reduce the temperature and noise
• Natural ventilation : if necessary, couple the roof window with other openings (classic windows or ventilation grilles) to create a natural air circuit

8. Balance sheet

With over 80 years of history , the Velux brand has established itself as one of the pillars of the roof window sector . Its history reflects the very evolution of the construction industry: from an innovation initially perceived as experimental (a pivoting window on the roof!) to an essential element of contemporary architecture.

Velux products address multiple challenges :

• Daylight : enhance the attic, improve the well-being of occupants, reduce electricity consumption
• Ventilation : preserve indoor air quality, regulate temperature
• Thermal insulation et acoustic : reduce heat loss, limit noise pollution
• Design and customization : multiple finishes, associated shutters and blinds, motorization options, etc.

For construction professionals , the Velux range offers a wide choice of solutions adapted to each project: renovation of old houses, new flat-roof construction, low-energy buildings, commercial premises, etc. Furthermore, the possibilities for combining different products (2-in-1 and 3-in-1 modular windows, light tunnels) open the door to creative and functional architectural configurations.

8.1. Future prospects

As the energy transition accelerates and home automation gains ground, Velux seems well-positioned to continue innovating. Current research focuses on integrating artificial intelligence , widespread use of air quality sensors , and improving materials (eco-friendly wood, high-performance glazing).

In the near future, we can imagine roofs equipped with Velux windows capable of automatically regulating light, temperature, and fresh air intake, interacting with the overall heating and cooling system. Attics would then become high-tech living spaces , a far cry from the dusty image of lofts of yesteryear.

8.2. Final word

Whether it's transforming an attic into a bright bedroom, modernizing a loft apartment, or designing a contemporary flat-roofed extension, Velux has become an essential partner for architects, building owners, and discerning homeowners. Its solutions combine reliability, functionality, and aesthetics, while meeting increasingly stringent energy and environmental requirements.

In short, the Danish company has revolutionized attic conversions and continues to write the history of the roof window, placing at the heart of its approach an obsession with light, ventilation, and interior comfort. For construction professionals , it is a valuable partner, offering technically proven products, educational support (technical datasheets, training courses), and international recognition.