What Biophilic Design Gets Wrong About Healthy Materials
What Biophilic Design Gets Wrong About Healthy Materials
Biophilic design has become one of the most recognisable ideas in contemporary architecture and interiors.
Timber. Stone. Plants. Natural textures. Organic forms. Earthy colours.
These elements can make spaces feel warmer, calmer and more connected to nature.
But there is a problem.
A material can look natural without necessarily being a healthy material.
That distinction matters, because biophilic design is increasingly being used as shorthand for healthy design, when the two are not the same thing.
A building may look deeply connected to nature while still containing materials that introduce unnecessary chemical exposures, poor indoor air quality, moisture risks or other environmental concerns.
If the goal is genuinely healthier buildings, biophilic design needs to go deeper than appearance.
Natural-Looking Does Not Mean Healthy
One of the biggest assumptions in biophilic design is that materials that look or feel natural are automatically better for people.
They are not.
A timber-look surface may actually be a composite product containing adhesives, resins, coatings or other ingredients that are not visible once installed.
A “natural” finish may contain solvents, preservatives, fragrances or additives.
A material marketed as sustainable may perform well environmentally while still raising questions about human exposure.
Even genuinely natural materials need to be considered in context.
What matters is not simply whether something comes from nature.
What matters is:
- what the material contains
- what it emits
- how it is installed
- what products are used with it
- how occupants may be exposed
- how it behaves in the building
- how it responds to moisture
- how it is maintained over time
Material health is therefore not an aesthetic judgement.
It is an assessment of composition, exposure and performance.
The Problem With “Natural” as a Marketing Term
The word natural is powerful because it suggests purity, simplicity and safety.
But from a material-health perspective, it tells us very little.
Natural substances can be irritating, allergenic or toxic.
Synthetic substances are not automatically hazardous.
A material cannot be meaningfully assessed simply by deciding whether it belongs in one category or the other.
This is where healthy-material specification becomes more rigorous.
Instead of asking:
Is this natural?
we need to ask:
What is it made from, how is it used, and what is the likely exposure?
That is a much more useful question.
Low-VOC Is Not the Same as Healthy
Another common shortcut is the low-VOC label.
Reducing volatile organic compound emissions can be an important part of improving indoor air quality.
But “low-VOC” is not a complete material-health assessment.
A low-VOC claim may tell us something about emissions under a particular testing method.
It may tell us very little about:
- the full ingredient composition
- semi-volatile compounds
- hazardous substances that do not readily volatilise
- additives
- preservatives
- plasticisers
- flame retardants
- manufacturing chemistry
- exposure created during installation
- what happens as the material ages
This does not mean low-VOC certification has no value.
It means it should be understood as one piece of information rather than the final answer.
Healthy specification requires a broader view.
Transparency Helps. It Does Not Replace Judgement.
The building industry has made significant progress in material transparency.
Tools such as Health Product Declarations, Declare labels, Environmental Product Declarations and other disclosure systems can give designers far more information than was available in the past.
That is important.
But transparency and safety are not the same thing.
A disclosed material is simply a material about which we know more.
That information still needs to be interpreted.
The presence of an ingredient does not automatically mean a product is unsuitable.
The absence of a particular ingredient does not automatically make a product healthy.
Exposure matters.
Concentration matters.
Installation matters.
Use matters.
Context matters.
Substitution matters too.
Removing one substance can sometimes result in another being introduced, and the replacement may not necessarily represent a meaningful improvement.
This is why material transparency should support professional judgement rather than replace it.
Exposure Is the Missing Part of Many Material Conversations
Hazard and exposure are often confused.
A substance may have hazardous properties, but the real-world risk depends partly on how and whether people are exposed.
That exposure may occur through:
- inhalation
- skin contact
- ingestion of contaminated dust
- emissions during installation
- degradation over time
- maintenance activities
- renovation or demolition
The same product may present very different exposure conditions depending on where and how it is used.
A material enclosed inside a building assembly is not the same exposure scenario as a finish applied across every interior wall.
A product installed wet is not necessarily the same as that product once fully cured.
A material used in a commercial lobby may create a different exposure profile from the same material used in a bedroom or nursery.
Healthy-material decisions therefore need to consider both hazard and exposure.
Biophilic Design Can Still Get the Material Wrong
This is where biophilic design sometimes falls short.
A designer may carefully select finishes that create visual connection to nature while paying insufficient attention to what those products actually contain.
For example, a project may include:
- timber-look composite flooring
- synthetic “natural” textiles
- heavily coated engineered timber
- fragrance-emitting finishes
- decorative planting alongside poor ventilation
- products selected primarily for environmental credentials without equivalent consideration of occupant exposure
The result may look biophilic.
It may even perform well against certain sustainability criteria.
But that does not automatically make it a healthy interior.
Healthy Materials Require a Different Specification Process
A healthier approach to specification asks more questions before selecting a product.
What is in the material?
Can the manufacturer provide meaningful ingredient disclosure?
Are there substances of concern?
Are ingredients fully disclosed or hidden behind proprietary descriptions?
What does it emit?
Are there credible emissions data?
What happens during installation?
How long does curing take?
How will people interact with it?
Is it a high-touch surface?
Will occupants be close to it for extended periods?
Could dust or fibres become an exposure pathway?
How does it behave with moisture?
Can it dry?
Is it vulnerable to microbial growth?
Could the installation trap moisture elsewhere in the assembly?
What other products are required?
Adhesives, primers, sealants, coatings and cleaning products can be just as relevant as the visible material itself.
How will it age?
Will it degrade?
Require frequent refinishing?
Generate dust?
Need aggressive maintenance products?
These questions move the conversation from appearance to performance.
Where WELL and Other Frameworks Help
Healthy-building frameworks such as the WELL Building Standard have helped bring issues including air quality, materials, light, comfort and occupant wellbeing into mainstream design conversations.
That is valuable.
Frameworks can establish minimum criteria, create accountability and encourage project teams to consider issues that may otherwise be overlooked.
But no certification system can replace project-specific judgement.
A building can satisfy a checklist and still contain decisions that deserve closer examination.
A product can satisfy one material criterion while performing poorly in another area.
A specification therefore needs to consider the building as a system, not simply as a collection of compliant products.
The strongest approach combines frameworks with deeper material-health assessment and building-science understanding.
Healthy Materials and Sustainability Are Related, But Not Identical
Another source of confusion is the relationship between sustainability and material health.
A material may have excellent sustainability credentials because it is:
- recycled
- recyclable
- locally sourced
- low embodied carbon
- durable
- rapidly renewable
- designed for disassembly
Those attributes matter.
But they do not automatically tell us whether the material is preferable from a human-health perspective.
Likewise, a material with a strong human-health profile may perform poorly in other environmental categories.
Good specification requires us to hold both questions at once:
What does this material mean for people?
and
What does this material mean for the environment?
The best choices seek to improve both.
Biophilic Design Should Go Beyond Appearance
Biophilic design has enormous potential.
But its value is diminished when it becomes an aesthetic language rather than a deeper relationship between people, buildings and nature.
A genuinely biophilic material strategy should consider more than whether a material looks organic.
It should consider:
- material composition
- indoor air quality
- exposure pathways
- moisture behaviour
- durability
- sensory qualities
- environmental impact
- connection to place
- how the material ages
- how the building supports human experience
That is a much richer interpretation of nature in design.
The Stronger Approach Is Integration
Healthy design does not need another silo.
Biophilic design should not sit separately from material health.
Material health should not sit separately from building science.
Building performance should not be considered separately from occupant experience.
The stronger approach is integration.
A timber finish should be considered for its sensory qualities, its composition, its emissions, its moisture behaviour, its durability and its environmental impact.
A wall system should be considered for thermal performance, moisture management, material health and the experience it creates.
A healthy interior should consider daylight, acoustics, materials, air quality, comfort and connection to nature together.
That is where healthier building becomes more than a checklist.
Healthy Materials Are About More Than What We See
The central mistake is assuming that a material that looks healthy is necessarily a healthy material.
It may be.
But appearance alone cannot tell us.
Healthy materials require us to look beneath the surface.
At ingredients.
At emissions.
At exposure.
At installation.
At performance.
At context.
And at how all of those factors interact within the building.
Biophilic design can help create environments that feel more connected to nature.
Material health helps make sure that connection is not merely visual.
The most successful healthy buildings need both.
References & Further Reading
International WELL Building Institute. WELL Building Standard v2. Materials, Air, Light and Thermal Comfort concepts.
Health Product Declaration Collaborative. Health Product Declaration Open Standard.
International Living Future Institute. Declare.
US Environmental Protection Agency. Resources on volatile organic compounds and indoor air quality.
World Health Organization. WHO Guidelines for Indoor Air Quality: Selected Pollutants.
About the Author
Annie Scog
Adv Dip Building Biology | BBNC | Certified Passive House Consultant
Annie Scog is the founder of Healthy Home Expert and a qualified Building Biologist, Building Biology New-Build Consultant and Certified Passive House Consultant. Her work focuses on healthier building materials, indoor environmental quality and the relationship between buildings and human health.
