Biophilic design is an approach to architecture and interiors that connects people with nature inside the built environment. It works through direct contact (daylight, fresh air, plants, water), indirect references (natural materials, colors, organic forms) and spatial conditions found in natural landscapes, such as prospect, refuge and mystery, with the aim of supporting health and wellbeing.
The idea sounds simple: put more nature in buildings. The two frameworks most designers work from, Stephen Kellert's attributes and Terrapin Bright Green's 14 patterns, ask for more than a few potted plants in a lobby. They describe how light moves across a room, how a seat backs onto a wall, how a corridor reveals what lies around the corner.
Where the Idea of Biophilia Comes From
The word biophilia means "love of life." The Harvard biologist E.O. Wilson popularized it in his 1984 book Biophilia, arguing that humans have an inborn tendency to focus on and affiliate with other living things. His reasoning was evolutionary: our senses and preferences were shaped by savannas, forests and weather, not sealed rooms.
Stephen R. Kellert (1943 to 2016), a Professor Emeritus at Yale University, spent much of his career turning that hypothesis into something designers could use. He co-edited The Biophilia Hypothesis with Wilson in 1993, and in 2008 he co-edited Biophilic Design: The Theory, Science, and Practice of Bringing Buildings to Life with Judith Heerwagen and Martin Mador.
In The Practice of Biophilic Design (2015), Kellert and the Vermont architect Elizabeth Calabrese define biophilia as "the inherent human inclination to affiliate with nature." They point out that for more than 99% of our species' history, humans developed in response to natural rather than human-made forces, while today the indoor built environment has become our "natural habitat," where people spend roughly 90% of their time. That mismatch is the problem biophilic design sets out to address.
What Is Biophilic Design in Architecture?
In architecture, biophilic design is the deliberate use of natural elements, natural analogues and nature-like spatial qualities to create buildings that work as good habitat for people. It is not a style. A timber cabin, a glass office tower and a hospital ward can all be biophilic, or not, depending on how they handle light, air, views, materials and spatial sequence.
Kellert and Calabrese stress repeated, sustained contact. The application of single or isolated plants, they write, "rarely exerts much beneficial effect"; vegetation should be "abundant, ecologically connected," and favor local species.
Their 2015 guide sets out five principles that any biophilic project should meet:
- It requires repeated and sustained engagement with nature.
- It focuses on human adaptations to the natural world that, over evolutionary time, have advanced health, fitness and wellbeing.
- It encourages emotional attachment to particular settings and places.
- It promotes positive interactions between people and nature that expand our sense of responsibility for both.
- It encourages mutually reinforcing, interconnected and integrated architectural solutions.
🎓 Expert Insight
"Biophilic design should never occur in piecemeal or disconnected fashion, but rather in a manner whereby the diverse applications mutually reinforce and complement one another, resulting in an overall integrated ecological whole." Stephen R. Kellert and Elizabeth F. Calabrese, The Practice of Biophilic Design (2015)
This is the line most often ignored in practice. A green wall bolted onto an otherwise windowless, uniformly lit office ticks one box while the rest of the space works against it.
Kellert's Three Experiences and 24 Attributes
In the 2015 guide, Kellert and Calabrese simplified the attribute lists from his earlier work into three kinds of experience and 24 attributes. Each one is meant to be combined with others, not applied alone.
Direct Experience of Nature
Actual contact with environmental features in and around the building. The eight attributes are light, air, water, plants, animals, weather, natural landscapes and ecosystems, and fire. Think daylight deep in plan, operable windows, fountains, gardens, balconies and hearths. If you want to go deeper on the first of these, our guide to daylighting in architecture covers orientation, glazing and metrics like sDA.
Indirect Experience of Nature
Contact with representations of nature, materials transformed from nature, or patterns and processes typical of the natural world. The ten attributes are images of nature, natural materials, natural colors, simulating natural light and air, naturalistic shapes and forms, evoking nature, information richness, age, change and the patina of time, natural geometries, and biomimicry. Wood furniture, wool fabrics, muted earth tones, leaf-like ornament on a column and materials that weather gracefully all belong here.
Experience of Space and Place
Spatial qualities of natural settings that supported human survival. The six attributes are prospect and refuge, organized complexity, integration of parts to wholes, transitional spaces, mobility and wayfinding, and cultural and ecological attachment to place. A window seat overlooking a double-height space is a typical move.
Terrapin Bright Green's 14 Patterns of Biophilic Design
In 2014, the New York consultancy Terrapin Bright Green published 14 Patterns of Biophilic Design, written by William Browning, Catherine Ryan and Joseph Clancy. The authors state that over 500 publications on biophilic responses were mined to build it, drawing on the work of Kellert, Roger Ulrich, Judith Heerwagen, Rachel and Stephen Kaplan and Christopher Alexander. Each pattern comes with evidence, metrics and implementation notes.
The 14 patterns sit in three groups:
- Nature in the Space: Visual Connection with Nature, Non-Visual Connection with Nature, Non-Rhythmic Sensory Stimuli, Thermal & Airflow Variability, Presence of Water, Dynamic & Diffuse Light, and Connection with Natural Systems.
- Natural Analogues: Biomorphic Forms & Patterns, Material Connection with Nature, and Complexity & Order.
- Nature of the Space: Prospect, Refuge, Mystery, and Risk/Peril.
A few of these are easy to misread. Non-Rhythmic Sensory Stimuli means brief, unpredictable movement such as rustling leaves. Thermal & Airflow Variability argues against perfectly uniform temperatures, drawing on Lisa Heschong's 1979 book Thermal Delight in Architecture, and the topic overlaps with passive cooling strategies such as cross ventilation and shaded courtyards. Risk/Peril describes a space where a perceived threat is paired with a reliable safeguard, such as a glass floor or a cantilevered walkway.
The Prospect and Refuge patterns are worth reading together. Terrapin defines Prospect as "a condition suitable for visually surveying and contemplating the surrounding environment for both opportunity and hazard." Refuge is "an easily accessible and protective environment," ideally with protection overhead and to one's back, on three sides. The report cites the central courtyard of Louis Kahn's Salk Institute in La Jolla, with its rill running toward the Pacific, as a nearly pure Prospect condition.
📌 Did You Know?
A real window beats a screen. Citing Kahn et al. (2008) in the Journal of Environmental Psychology, the 14 Patterns report notes that heart rate recovery from low-level stress was 1.6 times faster in a space with a glass window onto a nature view than with a high-quality plasma video of the same view, or no view at all.
Kellert vs Terrapin: How the Two Frameworks Compare
The frameworks overlap heavily, and many designers use both.
| Aspect | Kellert & Calabrese (2015) | Terrapin Bright Green (2014) |
|---|---|---|
| Structure | 3 experiences, 24 attributes | 3 categories, 14 patterns |
| Categories | Direct, indirect, space and place | Nature in the space, natural analogues, nature of the space |
| Emphasis | Principles, ethics, ecological context | Health evidence and implementation |
| Named only here | Fire, animals, patina of time, attachment to place | Mystery, Risk/Peril, Non-Rhythmic Sensory Stimuli |
| Best used for | Concept stage and design intent | Design development and briefing checks |
Why Is Biophilic Design Important?
Because the evidence for nature's effect on health is real, even if uneven. Kellert and Calabrese themselves admit that "the data is limited and the research often methodologically weak," but they argue that the breadth of findings across healthcare, work, education and housing points consistently in the same direction. A few studies carry most of the weight.
The most cited is Roger Ulrich's 1984 paper in Science, "View through a window may influence recovery from surgery." Ulrich examined records of gallbladder surgery patients at a suburban Pennsylvania hospital between 1972 and 1981. The 23 patients whose windows looked onto a natural scene had shorter postoperative stays, received fewer negative comments in nurses' notes and took fewer potent painkillers than 23 matched patients whose windows faced a brick wall.
For workplaces, a 2014 paper in the Journal of Experimental Psychology: Applied by Marlon Nieuwenhuis, Craig Knight, Tom Postmes and S. Alexander Haslam ran three field experiments in commercial offices in the UK and the Netherlands. According to the University of Exeter's summary of the study, adding plants to a previously bare "lean" office increased productivity by 15%, along with higher workplace satisfaction, self-reported concentration and perceived air quality.
The 14 Patterns report adds a few more figures with named sources. Positive emotions and mental restoration can begin within 5 to 20 minutes of immersion in nature (Brown, Barton and Gladwell, 2013). Nature sounds, compared with urban or office noise, sped up physiological and psychological recovery after a stressor by up to 37% (Alvarsson et al., 2010). On materials, Tsunetsugu, Miyazaki and Sato (2007) found that walls with about 45% wood coverage significantly lowered diastolic blood pressure.
Read these as individual studies with specific conditions, not universal multipliers.
Biophilic Design Examples in Practice
Biophilic thinking predates the term. The Terrapin report illustrates its history section with Victor Horta's Art Nouveau plant-tendril designs at Hotel Tassel in Brussels and the glass volumes of Mies van der Rohe's Farnsworth House. The columns of Gaudí's Sagrada Família, which branch like trees to carry the vault, are a textbook case of Biomorphic Forms; we cover that structure in our piece on how Gaudí turned nature and geometry into architecture.
Contemporary projects tend to combine several patterns at once. Green roofs, for instance, deliver Visual Connection with Nature, Connection with Natural Systems and habitat for animals in one move, which is why they appear in both frameworks. Our overview of green roof types and benefits explains the extensive and intensive systems that make this possible.
🏗️ Real-World Example
Bosco Verticale (Milan, 2014): Stefano Boeri's Vertical Forest places 800 trees, 4,500 shrubs and 20,000 plants from around a hundred species on two residential towers of 110 and 76 meters. The practice says the planting equals about five hectares of parkland concentrated on roughly 1,000 square meters, with each apartment hosting at least 2 trees, 8 shrubs and 40 plants.
Bosco Verticale is a strong case for direct experience of nature and Connection with Natural Systems. It says less about spatial patterns, a reminder that vegetation alone does not make a building fully biophilic.
How to Apply Biophilic Design on a Project
Start with the brief rather than the planting plan: who uses the space, for how long, and whether they need restoration, focus or social energy. The 14 Patterns report notes that Prospect needs significant space, while small visual and non-visual connections work on tight urban sites.
Then work through the three layers in order:
- Site and massing: orient for daylight and views, keep existing trees, and plan courtyards or terraces.
- Section and plan: create prospect from main rooms, refuge in seating areas, and partly revealed views along circulation.
- Materials and detail: favor wood, stone and natural fibers in muted earth tones, and let surfaces age visibly.
- Systems: allow some thermal and airflow variability through operable windows and mixed-mode ventilation instead of uniform conditions.
💡 Pro Tip
Show biophilic intent in your drawings, not only in the narrative. A section that tracks daylight, views and planting from street to rear garden makes the argument far better than a list of patterns. Layered vegetation cutouts and assets in plans and sections help clients see how dense and connected the planting really is.
Finally, run down Terrapin's 14 patterns and Kellert's 24 attributes and check whether the ones present reinforce each other. If you are a student building a foundation in this area, our article on core principles of sustainable architecture shows how biophilic goals sit alongside energy, carbon and water targets.
To show planting clearly in your renders and boards, our free 29 Vegetation Cutouts pack is ready to drop in.
The Bigger Picture
Biophilic design is often sold as a wellness add-on, a reason to specify a moss wall. Kellert saw it the other way around: the test was whether a building left people and its ecosystem in better shape over time. Read that way, the most biophilic decision on a project might be keeping an old tree, opening a window that actually opens, or letting a timber floor wear in rather than replacing it.
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