Written By:
William Richards
Think about the first time you walked into a space lit only with skylights. Maybe it was a world-class museum. Maybe it was an atrium. Skylights transform spaces, but lots of people don’t realize they also improve energy efficiency, support occupant wellness, and contribute to the architectural identity of a building. When thoughtfully specified, skylights bring in natural light exactly where it’s needed, help ventilate tight spaces, and subtly shape how interiors feel and function.
Skylights are also subject to some of the most demanding performance expectations in the entire building. They must withstand weather, provide insulation, offer daylight control, and—in many cases—do all of this while remaining operable. Challenges abound, but, smart specification begins with balancing design vision with practical performance.
Architects looking for technical guidance can reference the Window & Door Manufacturers Association (WDMA) Window, Entry Door, and Skylight Standards, available at wdma.com. These standards help professionals compare skylight products based on air infiltration, structural integrity, thermal performance, and more—ensuring that what you specify works as well as it looks.
Seeing is Believing
Skylights are the part of the building’s envelope that everyone notices when they enter a skylit space—it’s automatic and often inspiring. What they don’t see is that skylights have a direct impact on energy performance—making their thermal characteristics vital. important. Poorly performing skylights can become sources of heat gain in summer or heat loss in winter.
Look for skylights with low U-factors for insulation and solar heat gain coefficients (SHGC) tailored to your climate and orientation. Glazing options like Low-E coatings, argon gas fills, and insulated frames make a substantial difference. WDMA standards can help ensure you’re selecting products that have been tested and rated to meet code and deliver real-world performance.
Innovations like VELUX’s “Step” skylight system—a modular design allowing multiple skylights to be joined with clean lines and minimized thermal bridging—offer improved performance and sleek installation. The factory-flashed system integrates seamlessly with the roof to reduce air and water infiltration while optimizing daylighting.
The primary appeal of skylights remains their ability to deliver daylight from above, deep into interior spaces that wall windows simply can’t reach. This can reduce dependency on electric lighting, enhance mood, and support circadian rhythms—all major pluses in residential, hospitality, and commercial design.
But good daylighting is about quality as much as quantity. Orientation, aperture size, glazing clarity, and even the finish of interior surfaces all affect how daylight is distributed and perceived. Diffused glazing can soften harsh sunlight, while controls like integrated blinds or switchable glass help manage glare and privacy.
In the House of Light and Shadow in California, Ogawa Fisher Architects used a precise arrangement of skylights in the garage—typically an overlooked part of the home—to create a dynamic play of light that animates the space throughout the day. This is a strong reminder that skylights aren’t just functional; they can be poetic, even in utilitarian settings.
Photo Credit: VELUX
Bringing Air In, Keeping Water Out
In many applications, skylights are more than static elements—they’re an opportunity for natural ventilation. Especially in warm climates or tightly sealed buildings, operable skylights can help expel hot air and reduce mechanical cooling loads. Stack effect strategies often pair low operable windows with high operable skylights for passive airflow.
Whether manually operated or motorized, skylights should be easy to use and reliable. Rain sensors, remote controls, and automation tied to HVAC systems are increasingly common. But operability introduces more potential for air infiltration, so products should be specified with airtight seals and weather resistance in mind—something WDMA standards address thoroughly.
VELUX’s motorized venting skylights, for example, are designed with triple gaskets and automatic closing systems to prevent air and water leakage, ensuring that performance doesn’t suffer even when adding functionality.
Skylights can be subtle or bold, but they should always align with the building’s architectural intent. Whether you’re using a single light well in a small powder room or a grid of units in a vaulted atrium, their scale, rhythm and detailing matter.
Skylights, Form, and Function
At the 21c Museum Hotel in Nashville, Deborah Berke Partners (now TenBerke) used skylights not just as sources of light, but as compositional elements. The clerestories and overhead glazing help define circulation paths and public zones in a way that’s both functional and atmospheric. The skylights draw attention upward and contribute to the artful, gallery-like feeling of the space—supporting the project’s dual identity as hotel and contemporary museum.
Consider trim, reveals, and integration with ceiling systems when designing around skylights. Shallow wells and minimal frames can give a modern feel, while deeper light shafts create dramatic contrast and shadow play.
Because of their position on the roof, skylights are exposed to harsher conditions than vertical windows. Sun, rain, wind, and snow can all take their toll—so durability is paramount. Consider:
- Framing materials like aluminum, fiberglass, or vinyl-clad wood provide weather resistance.
- Glazing should resist scratching and UV degradation.
- Flashing kits and installation details are as important as the skylight itself—improper installation remains one of the leading causes of skylight failure.
VELUX and other manufacturers provide detailed installation guides and prefabricated flashing systems that reduce risk and speed up construction. Still, verifying product compliance with WDMA performance categories—such as structural load, impact resistance, and air/water infiltration—is essential for long-term reliability.
Skylight costs can vary widely depending on size, glazing type, operability, and controls. While they’re often seen as upgrades, they can add significant value—both functional and perceived—to a space.
Fixed units with standard glazing are relatively affordable; larger custom units or operable skylights with automation are more expensive. The total installed cost includes not only the product, but also roof framing, flashing, insulation, and interior finishing.
In hospitality projects like the 21c Museum Hotel, the added cost of overhead daylighting pays off in brand identity and user experience. In residential work, a single well-placed skylight can elevate the quality of life dramatically.
Photo Credit: VELUX
Safety is a Non-negotiable Consideration.
Skylights should use tempered or laminated glass, particularly in walkable or overhead applications. In hurricane zones or seismic areas, impact-rated units may be required. Operable skylights must close securely and prevent water infiltration during storms.
WDMA standards cover performance for wind resistance, structural load, and glass breakage—all critical for code compliance and peace of mind. Specifying products tested to these standards ensures your design won’t compromise safety.
Some jurisdictions also require fall protection for skylights—either via guards or reinforced glazing—so check local code requirements during the design phase.
Skylights bring light, air, and inspiration into a project—but only when thoughtfully integrated into the building’s performance strategy and design language. By considering factors like energy efficiency, daylighting, ventilation, and durability, architects can ensure that skylights serve both functional needs and aesthetic goals.
To specify with confidence, consult the WDMA Window, Entry Door, and Skylight Standards. These guidelines offer the technical foundation to match design vision with real-world performance—because beautiful spaces should also be smart, sustainable, and built to last.
William Richards is a writer based in Washington, D.C., and Paris and the co-founder of Team Three, an editorial and creative consultancy.
Webinar: Understanding Window, Door & Skylight Certification
Understand the benefits of window, door and skylight certification and how certified products can enhance your projects.
Webinar: Understanding Window, Door & Skylight Certification
The Understanding Window, Door & Skylight Certification webinar is designed to help architects and remodelers understand the benefits of window, door and skylight certification and how certified products can enhance their projects.
