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Prefabricated modules — your access to beautiful daylight solutions

Modular Skylights

Designed to provide daylight and fresh air through the roof, our Modular Skylights help create healthy, comfortable and productive indoor spaces. Complete pre-engineered modular design system with optional blinds. It is easy to specify, predictable and fast to install and time efficient through the entire building project.

Modularity
The modular system
The module
The system
Key benefits
1. Design
Flat roof with VELUX roof windows, modern design and natural light.
2. Indoor comfort & safety
4. Easy specification
5. Strong material
6. Quality consistency
Worker installing VELUX roof window on a sloped metal roof.
7. Easy installation

Here's what you can find on this page

Explore the different Modular Skylight solutions

Modular Skylights can be combined in a number of rooflight configurations, creating perfect solutions for a wide variety of building types: narrow corridors, internal courts, studios, large circulation spaces and much more. Each roof glazing solution is delivered with a special prefabricated flashing ensuring a perfect fit.

The versatile skylight system allows you to create a range of different designs for a variety of commercial buildings such as shopping malls, offices, cultural buildings, public spaces and healthcare buildings.

All Modular Skylight configurations are based on the same single module and the same basic installation process. You don’t need to specify different modules for different solutions.

Mono-pitched solutions

VELUX flat roof window module with five glass panels in dark grey frame.
Wall-mounted Longlight 5-45°
A rooflight series used to connect different building heights with a flat roof as the base and a vertical wall at the top.

Dual-pitched solutions

Modular VELUX flat roof window with multiple glass panels on white background.
Ridgelight 25-40°
A dual pitched rooflight for installation on a flat roof or at a roof apex.
Modular VELUX flat roof window with multiple glass sections in dark grey frame.
Ridgelight at 5° with beams
A dual pitched rooflight installed at a 5° angle with supporting beams.

Glass roof solutions

Modular VELUX flat roof windows arranged in rows on a flat surface.
Step Longlight / Ridgelight
Multiple rows of skylight modules connected to create a large glass roof.
Modular VELUX flat roof window system with multiple connected glass rooflight modules.
Atrium Longlight / Ridgelight
Multiple rows of skylight modules that can be combined to create a large glass roof.

Product details

Functions and sizes

Modular Skylights are available in a wide range of standard sizes and functionalities.

They require the following minimum and maximum measurements:

  • Module width: 675-1000 mm
  • Module height: 600-3000 mm
See size possibilities for fixed, comfort and smoke venting modules
VELUX roof window with sleek frame and clear glass for natural light.
Fixed skylight module
Features

Modular Skylight system is a turnkey solution comprising prefabricated skylight modules with dedicated claddings, flashings and vapour barrier connection strip to allow for design of watertight rooflight and glass roof structures.

Comfort ventilation is possible via an integrated chain actuator that can be controlled with VELUX io-homecontrol system or with your preferred building management system. Smoke ventilation can only be controlled with your preferred building management system.

For optimal daylight and heat control consider internal roller blinds that can be pre-mounted from the factory.

VELUX roof window with sleek frame and clear glass for natural light.
Fixed skylight module
Glazing

Modular Skylights come with standard low-energy double or triple glazing with the following features:

  • Insulated glazing (Ug values down to 0.5 W/m²K)
  • Toughened outer glass
  • Laminated inner safety glass
  • Falling through safety
  • Sound insulation (traffic, rain and hail)
  • Warm edge spacer (protects insulation properties over time and minimizes the risk of condensation at pane edges)
  • Step pane (leads water off the unit)
  • Sun protection coating (optional)
VELUX roof window with sleek frame and clear glass for natural light.
Fixed skylight module
Performance

The Modular Skylight profiles (sash and frame) are made of pultruded fiberglass (80%) and polyurethane composite (20%). The composite material provides high insulation performance and thermal stability as well as excellent profile stiffness and bending strength.

Due to the concept of prefabrication, we are able to test our products extensively against all thinkable hazards and stressful events. Tests are performed in controlled environments in accordance with harmonized standards for both Windows and doors and for Smoke and Heat control systems.

VELUX roof window with sleek frame and clear glass for natural light.
Fixed skylight module
VELUX roof window with sleek frame and clear glass for natural light.
Fixed skylight module

Interactive product samples

Explore and understand what makes Modular Skylights the right specification choice for your project

Modular Skylights are prefabricated and modular to give architects and specifiers design flexibility, enabling the creation of daylighting solutions that suit any commercial requirements. But what do the components look like and how do they work together?

Our interactive product cut sample is a fully rendered and 3D model. These features allow you to examine the shape and design of the Modular Skylight in greater detail than is possible with photography. Our model allows you to view the product from every direction and zoom in and out to view it up close. Try it below.

  1. Frame profile fixed module (pultruded composite material)
  2. Frame profile venting module (pultruded composite material)
  3. Sash profile venting module (pultruded composite material)
  4. Cover cap venting profile (plastic)
  5. Cladding profile (aluminium)
  6. Sash profile top (aluminium)
  7. Glazing unit
  8. Gaskets (EPDM)
  9. Glazing sealing/fastening (butyl)

Installation of Modular Skylights

Save time and money with our 100% prefabricated skylight modules that allows you to close the roof within days, regardless of the weather, and lets you to get on with the indoor work with speed and efficiency.
Learn more about our installation service
Installer fitting VELUX roof windows on a large rooftop, discussing installation.

"Everything fits, if it doesn’t, you have mounted it wrong. You just click on the cladding and flashing, there is no need for screws. This means that we can close the roof quickly so that everybody can get on with the indoor works."

Jørgen Wulffexperienced installer, Tømrerfirmaet John Wulff A/S

Sub-construction

A hassle-free installation starts with the sub-construction.

The sub-construction raises the modules above the roof surface, protecting the structure against water and drifting snow. The sub-construction provides the supporting base for the modular skylights. The skylight modules require an accurately dimensioned sub-construction, which can carry the module installation system.

The load-bearing capacity of the sub-construction needs to be calculated for each individual project based on the building design and application.

The sub-construction is not part of the prefabricated modular system, and the VELUX Group does not take responsibility for the sub-construction.

Crosscut view of modern roof window with insulation layers.
Wood
Wood remains the best choice for creating a light and economical sub-construction with maximum energy performance. Wood is not recommended for larger solutions and Ridgelight installations.
Cross-section of roof window installation with insulation and structural components.
Steel
Steel offers flexibility in combination with great strength. Steel also permits maximum insulation.
Crosscut view of flat roof window installation with insulation and metal framing.
Concrete
Concrete provides a strong, but heavy sub-construction, best suited for concrete buildings. Concrete sub-constructions are usually cast on site.

Securing modular skylights to the sub-construction

The top of the sub-construction should be finished with a steel profile or flat steel to provide a strong and level surface as the base of the installation brackets with clamps.
Wooden beam with metal top, structural support component.
Steel I-beam with robust construction and industrial design.
Concrete block with metal beam on top, showcasing construction materials.
Cross section of a wooden beam, showing texture and grain.

Get inspired by our case studies

Modern museum interior with skylights, staircase, and people walking.
Education

Royal Veterinary College

Daylight and fresh air for the longest-established veterinary school in England

London, United Kingdom — 2023Read more
Modern corridor with red and yellow accents, people walking.
Education

DCU Polaris Building

VELUX Modular Skylights bring daylight, ventilation and vitality to a cutting-edge STEM hub

Dublin, Ireland — 2025Read more
Corridor with VELUX roof window, natural light, yellow walls, and railing.
Education

University of Cambridge Primary School

Maximising daylight and natural ventilation with bespoke roof glazing

Cambridge, United Kingdom — 2016Read more
Explore additional products for Modular Skylights
Daylight and heat control
Comfort ventilation
Smoke ventilation
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Frequently asked questions

How can VELUX Modular Skylights improve occupant well-being and productivity in my building?

Skylights provide natural light, which has been proven to improve mood and overall quality of life. VELUX Modular Skylights bring abundant natural light deep into your building, promoting a more positive and energizing work environment. This can lead to improved employee alertness, reduced stress levels, and increased creativity. Our skylights are designed to optimize daylighting, while also controlling glare and heat gain, ensuring a comfortable and productive environment for occupants.

What are the potential energy savings with VELUX Modular Skylights?

Installing skylights increases daylight in the room, which can reduce the use of artificial lighting by up to 60%. In addition, natural ventilation does not use any electricity, while air conditioning is very energy intensive. The combination of natural ventilation in summer and heat recovery ventilation in winter is the most energy-efficient way to get fresh air all year long in cold climates. For more information and studies on energy performance, click here.

How do VELUX Modular Skylights comply with sustainability standards?

VELUX Modular Skylights are designed to meet or exceed sustainability standards.  The Environmental Product Declarations (EPD) for double and triple glazed products that Modular Skylights hold makes it easier to achieve compliance with environmental building rating standards. An Environmental Product Declaration assesses the environmental impacts of a product through its entire lifecycle, from manufacturing to the de-construction phase. This analysis takes into account the carbon footprint of the product as well as its recycling potential and highlights the benefits from plastic incineration processes and recycling of metal and glass. The recycling efficiency of Modular Skylights for all materials is maximum 90% in accordance with EN 17213.

What are the available customization options for VELUX Modular Skylights to meet my specific design and functional requirements?

VELUX Commercial offers a wide range of customization options to suit your unique architectural and functional needs. You can choose from various sizes and solutions , including continuous rows, to seamlessly integrate with your building's design. We offer a variety of high-performance glazing options, including options for solar control, acoustic performance, and safety. Our team can work closely with your architects and designers to develop a customized solution that perfectly meets your specific requirements.

How do Modular Skylights installations handle thermal expansion and contraction in varying temperatures?

All VELUX Modular Skylights modules use a pultruded composite frame material with an extremely low linear expansion coefficient (6.0 × 10^-6 m/mK) compared to aluminum (22.2), wood (5.0), or PVC (50.4). This property ensures the module maintains its dimensional stability and tightness of joints despite temperature fluctuations, minimizing thermal movement issues.

What is the expected lifespan and maintenance requirements of VELUX Modular Skylights?

VELUX Modular Skylights are built to last, with a long service life and minimal maintenance requirements. Our products are engineered using high-quality materials and undergo rigorous testing to ensure durability and reliability. Regular cleaning and inspections are recommended to maintain optimal performance. Modular Skylights have a reference service life of 30 years in accordance with EN 17213.

Can VELUX Modular Skylights be installed in an existing roof as part of a renovation project?

Yes, VELUX Modular Skylights are an excellent fit for renovation projects, thanks to their high degree of customization. The modular system offers flexibility in terms of module size, installation pitch, and solution types, allowing it to adapt to a wide range of existing roof structures and design requirements. This makes them ideal for refurbishment projects where architectural compatibility and tailored daylight solutions are essential. While the prefabricated design does support efficient installation, the key advantage lies in the ability to create a bespoke skylight configuration. It’s important to note that a suitable sub-construction must be designed to align with the existing roof.

How can I determine if my existing roof structure can support Modular Skylights?

To evaluate whether your existing roof can support Modular Skylights, an engineer will need to consider:

  1. The dead load of the skylight system
  2. The snow and wind load requirements for your location
  3. The current load-bearing capacity of your roof structure
  4. Any necessary reinforcements to the sub-construction

VELUX Commercial provides detailed technical information on structural requirements in their sub-construction guides.

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