A building biology assessment looks at a home’s whole indoor environment (mould and moisture, but also chemicals, particles, ventilation and electromagnetic fields), while a mould inspection focuses on finding moisture and mould and produces a written mould assessment report. If your concern is mould, a mould inspection and its report is usually the right tool. A building biology assessment earns its place when symptoms or concerns go beyond mould, or do not line up with where the mould is.
Either way, the document you get at the end is what matters. This guide covers what each assessment includes and what a report should contain to be useful to an insurer, a tribunal, a buyer or your GP.
What building biology is
Building biology (from the German Baubiologie) studies how the built environment affects the people living in it, using a precautionary approach. Many practitioners refer to the Standard of Building Biology Testing Methods (SBM), published by Germany’s Institute of Building Biology + Sustainability (IBN), which sets out how to assess physical, chemical and biological factors in sleeping and living areas. It is a professional methodology, not Australian law.
In Australia, the Australasian Society of Building Biologists (ASBB) runs a practitioner directory that lists certified building biologists and mould testing technicians. Its members test for electromagnetic fields, mould, allergens, drinking water, chemicals and air quality.
What a building biology assessment can cover
Scope is agreed with you, so not every assessment includes everything. Common areas:
| Area | What may be measured |
|---|---|
| Mould and moisture | Moisture mapping, visible growth, air or surface samples |
| Chemicals | Volatile organic compounds (VOCs) from paints, adhesives, flooring, furniture |
| Particles | Fine particles such as PM2.5 and PM10, dust and allergens |
| Indoor climate | Temperature, relative humidity, carbon dioxide as a ventilation indicator |
| Electromagnetic fields | Electric and magnetic fields from wiring, radiofrequency from wireless devices |
| Water | Drinking water quality, if requested |
A household focused on chemical sensitivity might weight VOC and particle testing; one worried about sleep might focus on the bedroom.
Building biology assessment or mould inspection?
A mould inspection and moisture investigation is usually right when:
- You can see mould or know there is a moisture problem
- Mould keeps returning to the same place
- You need a scope of works for remediation
- You need documentation for an insurance claim, rental dispute or purchase
A building biology assessment may be worth it when:
- Several people have symptoms that do not clearly match where the mould is
- A treating doctor has asked about the home environment more broadly
- You have recently renovated or moved into a new build and are concerned about off-gassing
- You want a broad baseline for a home, not just a mould answer
Mould methodology varies between building biologists, so if mould is the main concern, ask about their moisture investigation and sampling approach specifically. The indoor air quality testing guide explains what air sampling can and cannot show.
What a mould assessment report should contain
Whoever does the assessment, the written report is what turns a site visit into evidence. A useful report includes:
| Element | Why it matters |
|---|---|
| Date, address, inspector’s name and the instruments used | Makes the findings attributable and checkable |
| Moisture readings by location | Turns “it feels damp” into measured figures |
| Relative humidity and dew-point readings | Separates condensation-driven mould from a leak |
| Wide and close-up photos, keyed to locations | Lets a reader who has never seen the house follow the findings |
| The likely moisture source | The most important line in the report; everything else supports it |
| Building envelope observations | Explains why the moisture is there: roof, gutters, vents, fans, drainage |
| Laboratory results, if sampling was done | Independent data with the outdoor comparison and stated limits |
| Recommended scope of works | Turns findings into a plan |
A report that would read the same for any house was probably not built from real readings. One that says “mould present, remediation required” helps nobody.
How the report is used
- Insurance. Cover usually turns on whether the damage followed a sudden insured event or developed gradually, so a stated cause, dated readings and photos matter. The mould and home insurance guide covers what is typically claimable.
- Rental disputes. Responsibility generally follows the cause of the moisture. An independent, dated, location-specific report is the kind of evidence the NCAT mould claim guide describes preparing.
- Buying a home. A report detailed enough to support a price conversation or a request for pre-settlement repairs; see the pre-purchase mould inspection guide.
- Your GP or specialist. A record of what was found in the home, for them to weigh alongside their own assessment. It is not a diagnosis.
The report is yours once issued. You can use it to get quotes from any contractor, not only whoever wrote it.
Finding a practitioner and what drives the cost
For building biology, start with the ASBB directory. For specialist mould testing, NSW Health’s mould factsheet refers to occupational hygienists, whose peak body, the Australian Institute of Occupational Hygienists, runs a consultant directory. Before booking, ask for the agreed scope in writing, a sample report, and which laboratory analyses any samples.
Illawarra Mould Removal does not publish prices for either service. Cost is driven by the number of parameters tested, the number of samples and laboratory fees, the size and access of the home, and the depth of report required. A mould-only inspection is narrower than a full building biology assessment and is generally the more economical choice when mould is the concern.
Next step
If you are unsure which assessment fits, describe what you are seeing and why you are concerned on the contact form. The enquiry goes to an independent local professional, who can say whether a mould inspection will answer the question or a broader assessment is worth arranging.
Frequently asked questions
Is a building biology assessment the same as a building inspection?
No. A pre-purchase building inspection looks at structural condition and defects. A building biology assessment looks at indoor environmental factors such as mould, chemicals, particles and electromagnetic fields.
What’s in a professional mould assessment report?
Moisture readings by location, humidity and dew-point data, photos keyed to locations, the likely moisture source, building envelope observations, any laboratory results, and a recommended scope of works.
Is a mould assessment report the same as a laboratory test result?
No. The report covers the whole moisture investigation. Laboratory results from air or surface sampling are a separate piece of evidence that can be attached when sampling was done.
Can I use a mould report with a different contractor?
Yes. The report documents findings and a recommended scope, and there is no obligation to use whoever wrote it for the remediation work.
Does a building biology assessment include indoor air quality testing?
Usually, yes. An indoor air quality test is typically one part of a building biology assessment, which may also cover moisture, chemicals and electromagnetic fields depending on the agreed scope.