Building Biology FAQ

If you're here, something prompted it, a reading that worried you, a symptom you can't explain, or a new home that doesn't feel right. These are the questions that come up most often. The answers are straight, based on building biology standards and published research, no sales pitch attached.

What is building biology?

Building biology (Baubiologie) originated in Germany in the 1960s. It looks at how buildings affect the people living in them: electromagnetic fields, indoor air quality, moisture and mold, building materials, lighting, noise. The aim is to make living spaces that don't quietly work against you.

The discipline is organised around the 25 Principles of Building Biology, covering everything from site selection and materials to ventilation and electromagnetic exposure. Its measurement standard is the SBM-2008, which sets precautionary thresholds for sleeping areas.

Building biology differs from conventional building science in one respect: it applies the precautionary principle. Rather than asking "at what level does exposure cause proven harm?", it asks "at what level can we detect any biological response?", and recommends keeping exposure below that level, particularly during sleep.

What is the SBM-2008 standard?

The SBM-2008 (Standard der Baubiologischen Messtechnik) is the measurement standard used by building biologists worldwide. Developed in Germany and maintained by a ten-member commission of scientists and physicians, it defines precautionary thresholds for electromagnetic fields, radiofrequency radiation, indoor air pollutants, and other environmental factors.

The standard uses four concern levels. No Concern, Slight Concern, Severe Concern, and Extreme Concern, rather than a single pass/fail threshold. All values are benchmarked to sleeping areas, where the body does its heaviest repair work. "No Concern" represents conditions approaching natural, unexposed background.

What's the difference between building biology guidelines and government limits?

Government exposure limits (FCC in the US, ICNIRP internationally) are designed to prevent acute, short-term effects, primarily tissue heating from radiofrequency radiation. They assume that if the exposure doesn't heat tissue, it doesn't cause harm.

The SBM-2008 guidelines address long-term, low-level exposure and potential non-thermal biological effects. The practical gap: SBM thresholds are roughly 100 to 100,000,000 times stricter than government limits, depending on the type of EMF.

The FCC limit for radiofrequency radiation is approximately 10,000,000 µW/m². The SBM-2008 "No Concern" threshold for sleeping areas is 0.1 µW/m². That is a factor of 100 million.

Neither standard is "wrong", they answer different questions. Government limits protect against proven thermal effects. Building biology guidelines apply the precautionary principle to exposures that research suggests may have biological effects below the thermal threshold.

How can I test for high levels of EMF in my home?

You need a meter. EMF is not a single thing, there are three types to measure, each requiring different detection:

• AC magnetic fields, from current flowing in wiring, appliances, and power lines. Measured in milligauss (mG) or microtesla (µT).
• AC electric fields, from voltage in wiring and cables, even when devices are off. Measured in volts per meter (V/m).
• Radiofrequency (RF) radiation, from WiFi, cell towers, smart meters, Bluetooth. Measured in microwatts per square meter (µW/m²).

A basic approach: start with an entry-level meter like the TriField TF2 (~$175), which covers all three types. Walk through each room, bedrooms first, and note your readings. Compare them against the SBM-2008 threshold tables.

For guidance on what to measure first, how to take accurate readings, and what to do with the numbers, see the EMF Assessment Guide.

Which EMF meter should I buy?

For most homeowners starting out, the TriField TF2 (~$175) is the standard recommendation. It measures AC magnetic fields, AC electric fields, and RF radiation in one device, accurate enough to spot problems and compare against SBM-2008 thresholds.

Its limitations: RF measurement is broadband (you get a total number, not a frequency breakdown), and AC electric field readings can be influenced by body proximity. For a first home assessment, these rarely matter. The TF2 will tell you whether you have a problem and where it is.

If you want more precision, particularly for RF, purpose-built meters like the Safe and Sound Pro II or Gigahertz Solutions HF35C offer better sensitivity and frequency specificity, but at higher cost ($300-600+).

For a full comparison of meters by type and budget, see the EMF Meters Buying Guide.

What EMF level is safe?

Depends on which standard you follow and which type of EMF you're measuring.

The SBM-2008 "No Concern" thresholds for sleeping areas:

• AC magnetic fields: below 0.2 mG (20 nT)
• AC electric fields: below 1 V/m
• Radiofrequency radiation: below 0.1 µW/m²

Government limits are vastly higher, 833 mG (ICNIRP) for AC magnetic fields, ~10,000,000 µW/m² (FCC) for radiofrequency.

The SBM does not claim that exceeding "No Concern" automatically causes harm. It uses the language of precaution: "Slight Concern" means reduction is recommended; "Severe Concern" means remediation is recommended based on evidence of biological effects.

If you're measuring your own home and need to interpret the numbers, the SBM-2008 threshold tables give you clear ranges for each concern level.

Is WiFi harmful to health?

A WiFi router typically produces 10,000 to 100,000 µW/m² at one meter. Under the SBM-2008, that falls in "Severe" to "Extreme Concern" for sleeping areas.

The International Agency for Research on Cancer (IARC) classifies radiofrequency electromagnetic fields, the type WiFi uses, as Group 2B, "possibly carcinogenic to humans." Same category as lead and pickled vegetables. The evidence is limited but not dismissable.

Mainstream scientific consensus: WiFi at typical home exposure levels has not been proven to cause harm. Building biology's position: absence of proof of harm is not proof of safety, and the precautionary principle warrants reducing exposure where practical, especially during sleep.

Practical steps that cost nothing: turn off your router at night, or move it away from bedrooms. If you want to go further, switch to wired Ethernet and disable WiFi entirely. Your RF exposure drops dramatically without any special equipment or shielding.

Is 5G dangerous?

5G operates across several frequency bands. The sub-6 GHz bands are similar to existing 4G/LTE frequencies. The millimeter wave bands (24-100 GHz) are newer, higher frequency, and shorter range, requiring more cell sites closer together.

The honest answer: long-term health studies on 5G-specific frequencies are limited because the technology is recent. The IARC Group 2B classification for radiofrequency fields was based primarily on older cellular frequencies, not millimeter waves.

From a building biology perspective, the concern is cumulative RF exposure in the home, regardless of which generation of technology produces it. If your total RF reading in the bedroom exceeds SBM-2008 thresholds, the source matters less than the level. Measure it, compare it, reduce where practical.

Are EMF stickers, bracelets, and harmonizers real or snake oil?

They have no measurable effect. You can test this yourself: take an RF reading with a meter, apply any "harmonizer" or sticker, read again. The number does not change.

Products marketed as EMF harmonizers, neutralizers, or energy pendants claim to "restructure" or "harmonize" electromagnetic fields without reducing their intensity. No peer-reviewed study has demonstrated this mechanism. No instrument can detect any change in the field before and after application.

If the reading on a meter doesn't change, the exposure hasn't been reduced. Spend the money on an actual meter instead, a TriField TF2 costs about the same as many of these products and gives you real data you can act on.

Am I being crazy for worrying about EMF?

No. There is real science behind the concern, even if it isn't settled.

The IARC classified both radiofrequency fields and extremely low frequency (ELF) magnetic fields as Group 2B, possibly carcinogenic. Thousands of peer-reviewed studies have reported biological effects at sub-thermal exposure levels. Multiple governments have issued precautionary advisories, particularly for children.

Where it goes sideways is when concern becomes anxiety that stops you from functioning, or sends you toward expensive products with nothing behind them. The better path: measure your actual exposure, compare it to precautionary guidelines like the SBM-2008, fix what's practical, and let go of what isn't.

That's what building biology is for, a technical response to a real question. Not dismissal, not panic.

Is electromagnetic hypersensitivity real?

Electromagnetic hypersensitivity (EHS) is a condition in which people report symptoms, headaches, fatigue, difficulty concentrating, sleep disturbance, that they attribute to EMF exposure. The WHO recognizes EHS as a real condition with real symptoms, but does not classify it as a medical diagnosis because double-blind provocation studies have not consistently shown that affected individuals can detect EMF exposure above chance levels.

Some studies have found physiological markers (altered heart rate variability, changes in blood biomarkers) in self-reported EHS individuals when exposed to EMF. The research is inconsistent, not nonexistent.

If reducing EMF in your sleeping area improves your sleep or symptoms, it does not matter whether the mechanism is fully understood. Building biology consultants work with EHS clients regularly, and the approach is the same: measure, reduce exposure where practical, and see whether symptoms improve.

Indoor Air Quality

EMF is only one part of the picture. The air inside your home, what you breathe all night, every night, is the other half. These questions cover mold, off-gassing, and the materials your house is made of.

Is black mold actually dangerous?

Stachybotrys chartarum, the mold commonly called "black mold", produces mycotoxins (specifically satratoxins) that can cause respiratory symptoms, immune suppression, and neurological effects with prolonged exposure. It needs sustained moisture to grow (water-damaged drywall, chronically wet materials) and is a genuine health concern when present in occupied spaces.

Two clarifications. First, not all dark-colored mold is Stachybotrys. Mold color is not a reliable identifier, you need testing to confirm the species. Second, other mold species (Aspergillus, Penicillium, Chaetomium) can be equally problematic. Focusing only on "black mold" misses the broader issue: any significant mold growth in a home means a moisture problem, and any elevated spore count can affect health.

If you suspect mold, the priority is finding and fixing the moisture source. For testing options and what they actually tell you, see the Mold Testing Guide.

How long does new construction off-gas?

Most volatile organic compounds (VOCs) from new building materials off-gas hardest in the first 2-6 months, then taper. Some materials, pressed wood products with formaldehyde-based adhesives, certain spray foam insulations, vinyl flooring, can continue off-gassing at lower levels for 2-5 years or longer.

Formaldehyde is the primary concern. The IARC classifies it as Group 1 (known to cause cancer in humans). It's in particleboard, MDF, plywood, certain insulation, and some paints and finishes. The EPA estimates indoor air is typically 2 to 5 times more polluted than outdoor air, new construction widens that gap.

To speed things up: ventilate aggressively in the first few months (open windows, run exhaust fans), raise the temperature to accelerate VOC release, and consider an air purifier with activated carbon filtration. For material selection in new builds or renovations, see Non-Toxic Building Materials.

Are zero-VOC paints really zero?

No. "Zero VOC" is a regulatory term, not a literal one. In the US, it means the paint contains less than 5 grams of VOCs per liter (per EPA Method 24). Low, but not zero. And the testing measures VOCs in the base paint, tinting pigments added at the store can push the total up, sometimes significantly.

Still, zero-VOC paints are a real improvement over conventional paints at 50-200+ g/L. The off-gassing difference is measurable. They're a reasonable choice for most people.

If you want the lowest possible emissions, look for third-party certifications (GreenGuard Gold, for example) and choose lighter colours that need less tinting. For chemical sensitivities, mineral-based paints (silicate paints) use a fundamentally different chemistry, no synthetic resins.

Are building biologists legitimate?

Building biology is a recognised discipline with formal training programs, professional certifications, and published standards. The primary certification in North America is the BBEC (Building Biology Environmental Consultant), issued through the Building Biology Institute (IBN-affiliated). Certified professionals have completed coursework covering EMF measurement, indoor air quality, mold, building materials, and remediation.

Like any field, quality varies. When hiring a consultant, look for BBEC certification, professional-grade measurement equipment (not consumer meters), and willingness to teach you rather than push products. A good building biologist shows you the readings, explains what they mean, and gives you prioritised recommendations, not a sales pitch dressed up as concern.

To find a certified consultant in your area, see Find a Building Biologist.

How much does a professional EMF assessment cost?

A professional building biology assessment typically runs $300-800 for a standard residential evaluation. Price depends on home size, what's being measured (EMF only vs. EMF plus air quality), and where you live.

What you get: a trained consultant with professional-grade instruments (often $5,000-15,000+ in equipment) measures every room for AC magnetic fields, AC electric fields, radiofrequency radiation, and often dirty electricity. You receive a report with readings at each location, comparison to SBM-2008 thresholds, identification of sources, and prioritised remediation recommendations.

Whether it's worth it depends on your situation. If you're experiencing symptoms you suspect are environment-related, buying a home, or planning a renovation, a professional assessment gives you a remediation plan that DIY testing often can't match. If you just want a baseline, starting with your own meter and the EMF Assessment Guide is a reasonable first step.

You don't have to fix everything at once. Start with where you sleep. Your bedroom is where you spend a third of your life and where reduced exposure pays off most. Get a meter, take readings in the bedroom, open a window. Measurement, sleep, and ventilation, those three do more than any product or panic ever will.