Walk into a sun-filled room and you instantly feel the difference. That’s natural light at work, and it’s one of the most powerful design tools for creating buildings where people thrive.
Just like indoor air quality, daylight is fundamental to buildings that support productivity and wellbeing. When it’s not properly considered, spaces can end up gloomy, uncomfortable and energy-hungry. Getting it right in challenging spaces requires smart design and out-of-the-box thinking.
Read on to learn about the art (and science) of creating bright, comfortable, healthy buildings. Explore practical ways to use daylight, and get tips for spaces where windows aren’t an option.
Why daylight matters
Natural light directly impacts occupant wellbeing and cognitive performance. Research shows that access to daylight can:
- improve mood and cognitive performance
- regulate sleep cycles and reduce sleep disturbances
- enhance productivity in workplaces and learning environments.
Natural light is also a key consideration in energy efficiency. Well-lit rooms need less artificial lighting, lowering costs over the building’s life. The challenge is balance: too little and spaces feel gloomy; too much and you’re battling glare and overheating.
And at the end of the day, natural light is not always appropriate or achievable in every space. Every building faces different challenges, whether it’s heritage constraints, difficult orientations or budget limitations. Our job is to find the lighting strategy that works for your specific project.
How much natural light should a building have?
Australian codes and standards like the the National Construction Code (NCC), NatHERS and Green Star set minimum daylight access targets based on floor area and room type.
However, achieving genuinely effective daylighting goes beyond just meeting these benchmarks. Real-world performance depends on a complex interplay of factors, including:
- Building orientation and shading: The direction a building faces determines the intensity and duration of sunlight it receives.
- Window placement and size: The height, size and location of windows dictate how far light can penetrate into a space.
- Glazing specifications: The type of glass used impacts light transmission, solar heat gain and glare.
- Internal layout and finishes: Room depth, ceiling height and even the colour of the walls influence how light reflects and spreads.
- External obstructions: Nearby buildings, trees and overhangs can cast shadows and block light at different times of day.
Understanding how these elements work together is the first step in designing spaces that are bright, comfortable and efficient.
Making the most of every ray: Practical design strategies
Knowing the factors that influence daylight is one thing; the next step is using them to your advantage. Here are practical strategies to boost natural light while maintaining comfort and performance:
- Orient for controlled sunlight: Position primary living and working spaces to face north (in Australia) for consistent, manageable daylight, while using shading to control heat gain.
- Place windows high and wide: Position windows high on a wall to throw light deeper into a room. This maximises reach without sacrificing privacy.
- Choose the right glazing: Use double or low-e glazing to minimise unwanted solar heat gain in summer and heat loss in winter, without making rooms feel dark.
- Design open, reflective interiors: Use lighter colours for walls and ceilings to bounce light further into a building. Where possible, use open-plan layouts and internal glass to let light flow between spaces.
Case study: Lighting design for spaces without daylight
Not every room can have a window. Recently, we were engaged to consult on a school upgrade in regional Victoria. The project involved refurbishing a sick bay and an adjacent administration office located in a heritage-listed building. Due to planning constraints, no new windows could be added, leaving both rooms without natural light.
We recommended that both spaces be fitted with artificial lighting designed in accordance with AS/NZS 1680.0:2009. This standard sets out criteria for interior lighting that support task performance, visual comfort and safe movement within a space.
Sick bay solution
In the sick bay, a calm and consistent lighting environment was important. The room is used primarily for rest and observation, not active engagement. The use of diffused artificial lighting allowed for adequate visibility while minimising glare and overstimulation. Consistency in lighting intensity is particularly valuable in a space like this, where occupant wellbeing is the focus.
Office outcomes
In the adjacent office, the needs were different. Staff in this space manage paperwork, use screens and perform detailed administrative tasks. We advised on a lighting layout that prioritised clear task illumination, colour temperature control and visual comfort to reduce fatigue across long work periods.
Artificial lighting in both settings was essential not only because windows could not be introduced, but also because it provided a reliable and controllable lighting solution that suited the rooms’ specific functions. While natural light offers many benefits, this project showed that performance-based artificial lighting, when thoughtfully designed, can deliver high-quality outcomes.
Balancing daylight with energy and comfort
While abundant daylight is beneficial, it creates a critical design trade-off. Large windows can lead to significant solar heat gain, increasing the demand for cooling and creating uncomfortable glare. On the other hand, too much shading can leave spaces feeling dim and disconnected from the outdoors.
Striking the right balance is key to creating buildings that are both pleasant and energy-efficient. Smart design solutions to manage this trade-off include:
- High-performance glazing to filter heat and UV light.
- Dynamic shading systems (like automated blinds or louvres) that adapt to the time of day.
- Integrated Environmentally Sustainable Design (ESD) modelling to predict thermal performance.
- Mixed-mode ventilation systems that use natural airflow when conditions are right.
By analysing these options early, DDEG helps project teams prevent issues like over-shading or overheating, ensuring the final design delivers on its promise of comfort and performance.
A holistic approach to building performance
Achieving optimal daylighting isn’t the job of a single discipline. It requires a holistic view of how light interacts with the entire building system—from the facade and structure to the mechanical and electrical systems.
At DDEG, our expertise isn’t siloed. Our façade engineers, ESD consultants and building solutions experts collaborate to ensure your lighting strategy works in harmony with your thermal performance, energy efficiency and ventilation goals. This integrated approach allows us to identify and solve potential conflicts early, preventing the common problems that arise when design elements are considered in isolation.
The result is a building that is compliant and performs as a cohesive, efficient and comfortable system.