VELUX: roof windows & accessories

A story of innovation in the service of light and comfort

For over 80 years, the brand Velux has established itself as the international reference in the field of roof windows and attic conversion. Whether we talk about its Danish beginnings in 1941, technological developments in pivot hinges or its recent contributions (such as triple glazing or the integration of home automation solutions), Velux embodies modernity, reliability and creativity in the world of construction.

This article, both technical et immersion, revisits the history of VeluxThis section 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 in terms of...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: inform et to persuade professionals and experts in the construction sector of the interest in 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 story of Velux begins in 1941 with the vision of a Danish engineer, Villum Can RasmussenAt the time, many buildings (schools, housing) were making poor use of the space under the roofs or attics, and the concept of the roof window was still in its infancy. Rasmussen then designed a first window that would provide both natural light and total ventilation effective in 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, only a few years after the brand was created, Velux introduced a revolutionary device for the time: the pivot hingeThis patented system allows the roof window to rotate on its axis, providing simplified access for cleaning and handling. The idea is to make life easier for occupants while improving safety.

This first step marks the starting point of a long series ofinnovations that will define the brand's DNA. Velux is not just a manufacturer, it is a pioneer who is laying the foundations of a new market: that of Roof window modern, reliable and adapted to northern climate (exposure to wind, rain, snow).

2. Historical branches: expansion and establishment

2.1. Difficult beginnings in France

France is today one of Velux's main markets, but the brand initially met with a welcome mixed when it was established there in 1964. French tradition then favored skylights ou fanlight to light the attic, and the idea of ​​large pivoting roof windows seems disruptive and out of step with current habits.

It’s a emblematic construction site that will make the difference: in 1968, the Avoriaz winter sports resort opted for the massive installation of Velux windows in its buildings. The result: attics bathed in light and significantly improved comfort for holidaymakers. This success contributed to the reputation of Velux in France and paved the way for a generalization progressive use of roof windows in construction and renovations.

2.2. International development

The successes in Scandinavia and France are just one prelude to the expansion of Velux into European and then global markets. The brand develops subsidiaries and forms partnerships to adapt to local regulations (fire resistance, thermal standards, CE certification, etc.).

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

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 attic spaces 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 more advanced materials. However, they offer a comfort increased (observation of the landscape, air renewal) and an often 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 meets the architectural trend contemporary constructions, often with flat roofs, which require a supply of natural light as effective as in a sloping attic.

3.2. Light conduits (Sun Tunnel)

Sun Tunnels Velux windows allow you to bring the natural light in rooms far from the facades (corridor, central bathroom, dressing room). A reflective conduit connects the roof (where a sensor is placed) to the ceiling of the interior room, maximizing light transmission.

It is a product particularly appreciated for renovations, where you want to avoid major roof opening work, while still benefiting from natural light. Construction professionals emphasize the ease of installation, provided that waterproofing and orientation instructions are strictly observed.

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, providing 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 selection between these two types depends on the comfort desired, of the roof configuration, frequency of use and budgetArchitects and construction professionals often direct their clients towards a projection window if the view is strategic (mountain, sea, urban horizon), or towards a rotating window if the objective is mainly to gain in light and ventilation.

4.2. Glazing and energy performance

Velux offers a panel of glazing 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

The soundproofing is also taken into account. Certain specific glazing significantly reduces exterior 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

La pose of a Velux roof window requires special attention to ensure thesealingProfessionals must strictly follow the manufacturer's recommendations regarding the header, waterproofing fittings and surrounding tiles or slates.

Good implementation not only conditions the longevity from the window, but also the thermal performance et acousticWater infiltration 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 the renovation attics. Thousands of older buildings (individual houses, farms, apartment blocks) have unused or unwelcoming roof spaces. Installing one or more Velux roof windows can radically change the destiny of these surfaces, making them habitable, bright and pleasant.

The advantages for the construction professionals are many :

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 one 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 a summer comfort (limit overheating).

Velux solutions, including windows with the movie projection or to rotation, can be combined to create multiple skylights. Staggered placement or grouping (2-in-1 or 3-in-1 windows) results in very bright interiors, close to the standards of a loft or a room with large bay windows.

5.3. HQE, BBC, Passivhaus approach

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

Thanks to Velux Integra motorizations and the Velux Active solution, thenight ventilation can be automatically controlled to naturally cool the interior, a popular feature 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 capable of self-manage, to communicate with other elements of the house (heating, air conditioning, alarm, etc.), and to maintain a healthy environment. Velux Active is moving in this direction:

• Sensors measure the temperature humidity and 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 ofinnovation fits perfectly into the growth of smart buildings (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 invests in research on light pipes more efficient (better reflectivity, variable diffusion options). The idea is to provide a natural light in rooms without a facade, while regulating temperature and glare.

The emergence of electrochromic windows or controlled opacity could also arrive in the Velux catalog, allowing the window to be automatically tinted according to the sunlight, or even to modulate the transparency to preserve privacy.

6.3. Eco-design and life cycle

La sustainable construction also involves a look at theecological footprint products. Velux is already working to limit the impact of its windows, through the use of certified wood (FSC or PEFC), recyclable aluminum, and metal oxide glazing.

A high-performance roof window must display a positive balance : that is to say, it saves more energy (by limiting the use of artificial lighting and heating) than was needed to manufacture it. Environmental labels and certifications highlight these logics, and Velux subscribes to them to promote its products in a 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 existence, the Velux brand has established itself as one of the pillars of the sector Roof windowIts history reflects the very evolution of construction: from an innovation initially perceived as experimental (a pivoting window on the roof!) to an element that is now unavoidable of contemporary architecture.

Velux products meet the multiple issues :

• 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 translates into a wide choice of solutions adapted to each project: renovation of old houses, new construction with flat roofs, low-energy buildings, professional premises, etc. In addition, the possibilities of association (2-in-1, 3-in-1 modular windows, light conduits) open the way to creative and functional architectural configurations.

8.1. Future prospects

While energy transition accelerates and that the automation gaining ground, Velux seems well positioned to continue innovating. Current research focuses on the integration ofartificial intelligence, the generalization of air quality sensors and the improvement of materials (eco-responsible wood, high-performance glazing).

We can imagine, in the near future, roofs equipped with Velux windows capable of automatically regulate brightness, temperature and fresh air supply, in interaction with the overall heating and air conditioning system. The attic would then become a high-tech living space, far from the dusty image of the attics of yesteryear.

8.2. Final word

Whether you're converting an attic into a bright bedroom, modernizing an attic apartment, or designing a contemporary flat-roof extension, Velux has become a essential actor for demanding architects, project owners, and individuals. Its solutions combine reliability, functionality, and aesthetics, while meeting increasingly stringent energy and environmental requirements.

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