Low-VOC Materials in Interior Design: What You Need to Know | SID

Some of the most important material decisions in an interior are the ones you cannot see once the project is finished.

Paints disappear behind colour. Adhesives sit underneath flooring. Sealants become part of a finished surface. Engineered wood becomes cabinetry, shelving and furniture.

Yet all of these materials can influence the indoor environment long after we have finished thinking about how they look.

Material selection needs to go beyond colour, texture, price and durability. We should also understand what materials contain, what they may release into the indoor environment and what the claims on their labels actually mean.

One of the claims we increasingly encounter is “low-VOC”.

It sounds reassuring. But what does it actually tell us?

And does choosing a low-VOC product automatically mean that we have chosen a healthier one?

What are VOCs?

VOC stands for volatile organic compound.

Broadly speaking, VOCs are organic compounds that can be released into the air from certain solids and liquids. They are not one single chemical or one single type of pollutant. The term covers many different compounds with very different properties. The precise regulatory definition can also vary between jurisdictions and purposes.

That distinction is important.

It is tempting to talk about “VOCs” as though they are one substance with one health effect. They are not.

According to the US Environmental Protection Agency (EPA), the ability of organic chemicals to cause health effects varies considerably. The nature and extent of any potential effect also depend on factors including the particular compound, concentration and duration of exposure.

So the useful question is not simply:

“Does this product contain VOCs?”

We need better questions.

Which compounds are present? How much is present? What does the product emit into indoor air? How was that measured? And are there credible standards or test results behind the manufacturer's claim?

Where can VOCs appear in an interior?

More places than many people realise.

The EPA identifies building materials and furnishings among potential indoor sources of VOCs, alongside paints, varnishes, solvents, glues and adhesives.

From an interior-design perspective, I would pay particular attention to:

Paints and coatings

Paint covers enormous surface areas in many interiors. The paint itself, primers and specialist coatings can all be relevant when evaluating VOCs.

Adhesives and sealants

They are easy to overlook because they often disappear completely once a project is finished. They can be used under flooring, behind wall finishes, in joinery and in many other construction applications.

Engineered wood

MDF, particleboard, plywood and other composite wood products are widely used in cabinetry and furniture. Depending on the product and its manufacture, adhesives and resins used within these materials can be relevant to indoor emissions.

Flooring

The flooring material is only part of the specification. Adhesives, underlays, coatings and finishes may matter too.

Furniture

Furniture is not simply wood, fabric or metal. A single upholstered piece may contain timber or composite wood, foam, textiles, adhesives, coatings and other components.

This is why I prefer to think about the whole product or material system, rather than focusing on the most visible surface.

Why do VOCs matter for indoor air quality?

We spend a great deal of time indoors, so the materials introduced into those environments deserve consideration.

But this is also where sustainability and wellness discussions can become unnecessarily alarming.

Some VOCs are associated with adverse health effects, while the potential effects vary considerably between individual compounds. Exposure level and duration matter too. EPA guidance also notes that knowledge about the health effects of many organic compounds at concentrations normally found in homes remains limited.

That is a much more useful way to understand the issue than simply saying:

“VOCs are toxic.”

That statement is too broad.

As designers and consumers, our goal should not be fear. It should be better material information and sensible exposure reduction where appropriate.

What does “low-VOC” actually mean?

This is where things become more complicated.

“Low-VOC” sounds like a universal standard. It is not.

The meaning can depend on the product category, jurisdiction, testing method and certification or regulatory framework being used.

This is one reason I would never choose a product solely because the front of the packaging says low-VOC.

I want to know:

Low compared with what?

Which VOC definition is being used?

Is the claim about VOC content or emissions?

Was the product independently tested?

Which standard was used?

Those questions give us far more useful information than the marketing phrase alone.

VOC content and VOC emissions are not the same thing

This distinction is particularly important.

VOC content generally refers to VOCs contained in a product formulation.

VOC emissions concern compounds released from a product into the surrounding air under specified conditions.

Those are related concepts, but they are not interchangeable.

For example, current EU Ecolabel criteria for paints and varnishes include specific requirements relating to VOC and semi-volatile organic compound (SVOC) content, together with defined assessment methods.

Meanwhile, some product-testing and certification systems for interior materials focus on emissions after a product is placed into an indoor environment.

EPA also warns that VOC labels and certification programmes do not all measure the same thing. Some focus on emissions relevant to indoor environments, while others use definitions developed for other regulatory purposes, including the control of outdoor air pollution.

For someone specifying an interior, this difference matters.

A number printed on a paint tin and an emissions test for a finished piece of furniture are not necessarily telling us the same thing.

Does “zero-VOC” mean zero emissions?

Not necessarily.

This is another claim I would treat carefully.

A “zero-VOC” or “no-VOC” label needs to be interpreted according to the definition, threshold and testing framework behind it.

EPA specifically cautions that some products labelled “no VOC” or “low VOC” under certain regulatory definitions may still contain volatile organic chemicals relevant to indoor air quality. It also notes that reducing total VOC does not automatically establish that one product is safer than another because individual VOCs can differ considerably in toxicity.

That does not mean that low- or zero-VOC information is meaningless.

It means we should avoid turning a useful metric into a claim it was never designed to make.

For me, “zero-VOC” is a reason to investigate further, not a reason to stop investigating.

Natural does not automatically mean low-emission

This is another assumption worth questioning.

In sustainable interiors, the word natural is often treated as synonymous with healthy.

They are not the same thing.

Natural materials can emit organic compounds too. The origin of a chemical — natural or synthetic — does not by itself tell us everything we need to know about its effect on indoor air.

Likewise, a synthetic material is not automatically the worst choice simply because it is synthetic.

This is why I prefer evidence to categories.

Instead of asking only whether something is natural, I would ask what it contains, what it emits, whether those emissions have been tested and whether the product performs well enough to remain in use for a long time.

The materials I would pay particular attention to

Not every surface in a project requires the same level of scrutiny.

I tend to think about scale, proximity, exposure and quantity.

A tiny decorative object and hundreds of square metres of paint are not equivalent specifications.

Neither are a small side table and an entire wall of built-in cabinetry.

If I were reviewing a project specifically with indoor emissions in mind, I would pay particular attention to large-surface materials and products used extensively throughout the space: paints, flooring systems, cabinetry, composite wood, large upholstered pieces, adhesives, sealants and finishes.

I would also think about the interaction between materials.

A beautiful timber floor, for example, is not just a timber decision.

What is underneath it?

Does it require an adhesive?

How is it finished?

How will it be maintained?

The complete specification matters.

How I specify lower-emission materials as an interior designer

I would begin by looking beyond the marketing language.

If a manufacturer says a product is low-VOC, I want to know what supports that claim.

Is there a technical data sheet?

Are actual values provided?

Has the product been tested?

Which standard was used?

Does the documentation refer to content, emissions or both?

Is the information for the exact product and finish I am specifying?

That last question is particularly important.

A manufacturer's general sustainability page is not necessarily evidence about every product in its collection.

I would then consider the material within the context of the entire project.

For example, if I am specifying cabinetry, I may need to think about the board material, adhesives, edge treatments and surface finishes — not simply whether the timber veneer looks natural.

If I am specifying flooring, I may need information about both the floor and its installation system.

And if I am specifying furniture, I want to understand as much of the construction as reasonably possible.

Good material specification is rarely about finding one perfect label. It is about building a better picture from several pieces of evidence.

Certifications and labels can help — if we understand them

Third-party environmental labels can make this process easier, but they still need to be understood in context.

In Europe, the EU Ecolabel uses product-specific criteria rather than one identical set of requirements for everything. The European Commission states that its criteria are designed around the relevant environmental impacts of individual product categories across their life cycle and are periodically reviewed.

For paints and varnishes, current EU Ecolabel requirements include criteria relating to VOC and SVOC content, alongside restrictions concerning hazardous substances.

Other European schemes may focus on particular categories or emissions. Germany's Blue Angel, for example, has criteria for low-emission products used indoors, including certain furniture and furnishing categories.

But the principle remains the same as with FSC certification:

Understand what the label certifies before deciding what the label proves.

No single logo should replace product-level research.

What I would ask before specifying or buying a product

When indoor emissions are relevant to a project, these are the questions I find more useful than simply asking whether something is “eco-friendly”:

What exactly is the low-VOC or emissions claim based on?
Does the information concern VOC content, emissions, or both?
Is there a technical data sheet or test report?
Which testing method, standard or certification was used?
Does the documentation apply to this exact product, colour, finish or formulation?
What other materials, adhesives, coatings or finishes form part of the final installation?
Is there a credible third-party environmental or emissions label relevant to this product category?
Can the manufacturer answer these questions clearly?

You do not need to become a chemist to choose interior materials.

But manufacturers should be able to provide better answers than “It's green”, “It's natural” or “It's low-VOC”.

Material choices are only one part of indoor air quality

There is another important point.

Choosing lower-emission materials does not mean we have “solved” indoor air quality.

Indoor air is affected by multiple sources and conditions. Ventilation, occupant activities, cleaning products, combustion sources, moisture and other factors can all play a role.

Even during installation or renovation, ventilation can be important. EPA guidance recommends increasing ventilation when using products that emit VOCs and following product precautions and manufacturer directions.

So I would not describe a room as “healthy” simply because low-VOC paint was specified.

That is too large a conclusion from one material choice.

The connection between healthy materials and sustainable design

For me, this is where sustainable interior design becomes more interesting.

We often divide decisions into separate boxes:

Is it sustainable?

Is it healthy?

Is it durable?

Is it beautiful?

Is it affordable?

But real interiors do not work in separate boxes.

A material with lower emissions that fails prematurely and needs to be replaced may create another problem.

A durable material with very poor transparency deserves further investigation.

A natural material is not automatically responsible.

And a certified material does not automatically make an entire product sustainable.

This is why SID will continue to look beyond individual claims.

The goal is not to find perfect materials. It is to make better-informed decisions about the materials we bring into our homes.

The SID takeaway

Low-VOC can be useful information.

But it is not a complete definition of a healthy material, and it is certainly not a complete definition of a sustainable one.

When I specify materials, I want to know more than what is written in large letters on the front of the product.

I want to understand what the claim refers to, how it was measured, whether credible documentation supports it, what other materials are involved and how the finished product will perform over time.

That may require a little more work.

But material transparency should become a normal part of good interior design — not an optional extra reserved for projects labelled “sustainable”.

Because what we choose for an interior matters not only for how the space looks.

It also matters for how the space performs and what we bring into the environment where people live every day.