Healthy
BUILT FOR YOU. BUILT FOR YOUR FAMILY
The average house is not designed with your health in mind.
Formaldehyde
Released by pressed-wood products, adhesives, and insulation. A known carcinogen. Detectable in virtually every conventional home, often exceeding WHO guideline levels.
VOCs
Volatile organic compounds off-gas from paint, flooring, and furniture. In a sealed home, they accumulate to levels up to 10 times higher than outdoors.
Radon
A radioactive gas that seeps through foundations. The second leading cause of lung cancer. Invisible. Odorless. Persistent.
CO2
Without proper ventilation, CO2 from breathing alone accumulates to levels that harm cognitive ability, sleep, and overall wellbeing.
It doesn't have to be this way
Modular is built for health
Up to 90% less dust, allergens, and airborne viruses.
Continuous mechanical ventilation with medical grade filtration.
Welcome to the future of living
AIR QUALITY
Your health is not negotiable.
Indoor air can be up to 10x more polluted than outdoor air, up to 300x during certain activities. People spend over 80% of their time indoors. Up to 98% of a person’s formaldehyde exposure occurs indoors, in the home they think is safe. Nexa Modular Solutions homes eliminate these risks at the source.
Indoor Air Quality Comparison
Nexa Modular Solutions
Conventional Home
WHO Guideline
Formaldehyde (HCHO)
Reduced by up to 90%
50-120 µg/m³
100 µg/m³
Total VOC
Reduced by up to 95%
200-500 µg/m³
300 µg/m³
CO2 Concentration
Reduced by up to 95%
1,000-2,500 ppm
1,000 ppm
Radon
Reduced by up to 99%
50-300 Bq/m³
100 Bq/m³
What's NOT in your home
Formaldehyde
Group 1 carcinogen found in plywood, particleboard, and standard adhesives. We use Agepan ECO OSB 3: no excess formaldehyde off-gassing, Passivhaus approved.
Petroleum adhesives
Conventional binders off-gas for years. Every adhesive in a Nexa Modular Solutions home is organic-based. Zero petroleum compounds.
Synthetic vapor barriers
Plastic membranes trap moisture and degrade over time. Our wall system uses wood-fiber boards that manage vapor diffusion naturally.
Synthetic insulation
Polystyrene and spray foam trap moisture and degrade. STEICO wood fiber insulation breathes, performs, and is fully organic.
VOC sheathing
Standard OSB releases volatile organic compounds for years after installation. Agepan ECO OSB 3 is VOC-free and independently certified.
Toxic finishes
No synthetic paints, no chemical sealants, no off-gassing coatings. 98% of materials in your home are organic.
Air that's cleaner than outside.
Continuous ventilation with up to 90% filtration replaces indoor air without opening a window. CO2 stays below 800 ppm, so your lungs never work harder than they need to.
Silence between you and the world.
The wall assembly absorbs sound across all frequencies: traffic, neighbors, weather. Inside, the ventilation runs at whisper level.
54 dB insulation
So natural, so safe
Thermal-bridge-free construction keeps every surface above dew point. No cold corners, no moisture, no mold. Walls stay as clean as the day they were built.
Every wall, same temperature
All interior surfaces stay within 3°C of room temperature. No cold walls, no hot ceilings. Just uniform comfort you feel but never think about.
Certifications that matter.
Certified
Passivhaus System Certification
The MODULAR system is certified by the Passivhaus Institute from Darmstadt to the world's strictest thermal, airtightness, and ventilation standards. Over 2,000 tracked parameters considered.
EPD International
Full lifecycle transparency audited by a third party. Confirms carbon-negative at -101 kg CO2e/m² from raw material to end of life.
FSC & PEFC
Chain-of-custody on all applicable timber. Timber traceable from sustainably managed European forests to your home.
Our principles
Efficient
Passivhaus-certified. ~15 kWh/m² per year.
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Healthy
98% organic materials. Zero VOCs.
You Are Here
Sustainable
Carbon-negative walls. EPD verified.
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Prefabricated
Factory-built in 3 weeks.
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Made in Europe
5 countries. Full traceability.
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Questions you might be asking.
THE PROBLEM
Is indoor air quality really a health risk?
Yes. The European Environment Agency reports that indoor air can be up to 10x more polluted than outdoor air, up to 300x during renovation or cleaning. Europeans spend over 80% of their time indoors.
Common pollutants include VOCs (volatile organic compounds) from paints and furniture, formaldehyde from engineered wood, radon from foundations, and mold from poor ventilation. The WHO links poor indoor air to respiratory disease, allergies, and reduced cognitive function.
See how our materials eliminate these risks.
What pollutants are found in conventional homes?
The most common: formaldehyde (from chipboard, MDF, adhesives), VOCs (from paints, sealants, cleaning products), radon (a radioactive gas from soil), mold spores (from condensation and poor ventilation), and particulate matter (from cooking, heating, and outdoor infiltration).
Conventional construction rarely addresses any of these systematically.
THE SOLUTION
How do Nexa Modular Solutions homes provide healthy indoor air?
Three systems working together: (1) 98% organic, low-emission materials like real wood, Steico wood-fiber insulation, and mineral-based finishes that emit near-zero VOCs. (2) Continuous Zehnder mechanical ventilation with high-efficiency filtration that exchanges air every 2 hours without opening windows.
(3) Passivhaus-level airtightness that prevents outdoor pollutants, pollen, and radon from entering unfiltered.
What is an EPD and why does it matter for health?
An Environmental Product Declaration (EPD) is an independently verified lifecycle assessment of a building’s environmental and health impact, from raw material extraction through manufacturing, use, and end-of-life.
BIOBUILDS’ EPD proves the home is carbon-negative and that all materials meet strict health and emissions thresholds. It’s the building industry’s equivalent of a nutrition label.
Learn more about our certifications.
Are Nexa Modular Solutions homes suitable for people with allergies or asthma?
Yes. The combination of low-emission organic materials, continuous filtered air supply, controlled humidity (40-60% year-round), and elimination of thermal bridges (which cause condensation and mold) creates an environment specifically suited for allergy and asthma sufferers.
No carpet off-gassing, no mold risk, no unfiltered outdoor pollen.
Talk to us about health-specific configurations.