Daylight & Glare
Daylight, Glare and the WELL Building Standard
Daylight is an important part of indoor environmental quality, but useful daylight needs to be balanced with glare control, visual comfort and building performance.
Quick Answer
How do daylight and glare relate to the WELL Building Standard?
Daylight and glare relate to the WELL Building Standard because light is one of the key ways people experience the indoor environment. WELL considers how lighting conditions, daylight access, visual comfort and internal environmental quality influence the experience of occupants inside buildings.
In commercial buildings, good daylight performance is not simply about making spaces brighter. It requires a balance between daylight availability, glare control, façade design, solar exposure, electric lighting, internal planning and the way people use the space throughout the day.
Why daylight matters in WELL
Daylight can strongly influence how a workplace or commercial interior is perceived. Spaces with well-managed daylight often feel more open, legible and comfortable. However, daylight only supports the indoor environment when it is controlled, distributed and coordinated with the rest of the building design.
A space can have large amounts of glass and still perform poorly if occupants experience glare, heat gain, screen reflections, excessive contrast or uncomfortable solar exposure. This is why daylight needs to be considered as part of indoor environmental quality, not only as an architectural feature.
Within a WELL context, light connects occupant experience with façade design, workplace planning, shading, artificial lighting, thermal comfort and operational building performance.
Daylight is not only about brightness
A common mistake is to treat daylight as a simple measure of how much natural light enters a space. In practice, visual comfort depends on the quality, direction, distribution and intensity of light, as well as how people are positioned within the space.
Too little daylight can make a space feel enclosed or heavily dependent on artificial lighting. Too much uncontrolled daylight can create glare, heat gain and uncomfortable contrast. The best daylight strategies usually sit between these extremes.
For WELL-related design thinking, the question is not simply whether a building has daylight. The better question is whether daylight supports the comfort, usability and environmental quality of the occupied space.
What causes glare in commercial buildings?
Glare occurs when brightness or contrast makes it difficult or uncomfortable to use a space. In commercial interiors, glare may come from direct sun, bright sky conditions, reflective surfaces, highly glazed façades, poor workstation placement or contrast between windows and darker internal areas.
Glare is especially important in screen-based workplaces, learning environments, healthcare settings and other spaces where people need sustained visual focus. A room may look visually impressive in photographs but still be uncomfortable for people working there each day.
Managing glare usually requires coordination between façade design, shading systems, glazing selection, internal layout, workstation orientation and electric lighting strategy.
Key factors that influence visual comfort
Daylight distribution
Good daylight is usually distributed across the occupied area rather than concentrated only near windows or façade edges.
Glare control
Visual comfort depends on reducing excessive brightness, contrast, reflections and direct solar exposure.
Façade and glazing design
Window size, orientation, glass type, shading and façade depth all affect daylight quality and glare risk.
Internal planning
Workstations, meeting rooms, circulation zones and screen-based areas need to be positioned with daylight and glare in mind.
The role of façade design and solar control
Façade design has a major influence on daylight performance. Glazing, orientation, shading, external obstructions and internal blinds can all affect how daylight enters the building and how comfortable the space feels during different times of day and year.
Solar control is particularly important because the same sunlight that improves daylight access can also increase heat gain and glare. This means daylight performance should be coordinated with thermal comfort, HVAC load, façade performance and the overall indoor environmental strategy.
In a WELL-related project, façade decisions should not be treated only as aesthetic or energy decisions. They directly affect the visual and environmental conditions occupants experience inside the building.
Daylight, electric lighting and operations
Daylight performance does not sit separately from electric lighting. A well-performing commercial interior usually needs both natural and artificial lighting to work together, especially as outdoor conditions change throughout the day.
Lighting controls, dimming systems, blinds, maintenance, occupant behaviour and space management can all affect the final visual environment. A design may provide good daylight potential, but the occupied experience depends on how the space is controlled and used.
For this reason, daylight and glare should be considered through both design and operational lenses.
How daylight modelling can support WELL-related decisions
Daylight modelling can help project teams understand how daylight is likely to behave before a space is built or occupied. It can assess daylight availability, distribution, glare risk, façade response and the effect of shading or internal planning decisions.
This can be useful when WELL is being considered because it provides evidence about the visual environment occupants may experience. It helps project teams move beyond general claims about daylight and into a more specific understanding of building performance.
Daylight modelling does not replace WELL Certification, but it can support better coordination between façade design, workplace planning, lighting strategy and indoor environmental quality.
Daylight and glare in existing commercial buildings
In existing buildings, daylight and glare issues often become visible through occupant feedback, screen visibility problems, hot zones near windows, over-reliance on blinds or inconsistent lighting conditions across the floorplate.
These issues may be caused by façade limitations, workstation layout, poor solar control, excessive contrast, reflective surfaces or changes in how the space is used. WELL can help frame these issues as part of a broader indoor environmental quality review.
For existing assets, the goal is often not to maximise daylight at all costs, but to create a more usable and comfortable visual environment for occupants.
Daylight as part of commercial environmental performance
Daylight performance sits at the intersection of occupant experience, building envelope design, energy use, thermal comfort and workplace quality. A daylight strategy that works well visually can also support better spatial quality and reduce unnecessary dependence on artificial lighting.
However, daylight needs to be managed carefully so that it does not create glare, heat gain or discomfort. This makes daylight one of the most important bridges between WELL, façade performance, thermal comfort and commercial environmental design.
Within the Certified Energy ecosystem, daylight and glare belong beside thermal comfort, CFD, ventilation, NABERS, operational energy and WELL as part of a broader understanding of environmental building intelligence.
Related Knowledge Hub
Learn more about WELL Rating
For a broader overview of WELL Rating, WELL Certification, indoor environmental quality and commercial building performance, visit the Certified Energy WELL Rating Knowledge Hub.
