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About MJ Building Bio

A home is more than four walls.
It is the air you breathe every single day.

MJ Building Bio was built on one belief: that the health of your home and the health of your body are not separate things. When something is wrong with one, it shows up in the other. Marijana Vidak has spent years learning to find the connection that others miss.

Marijana Vidak
Marijana Vidak
Building Biologist · Mould Testing Technician

"Your home. Your assessor. Your results."

The story

From the land we grow food on, to the air inside your home.

Marijana's path into building biology began with a simple but profound curiosity: what actually goes into the things we consume, the products we use, and the spaces we live in? Working in an industry that took land treatment and natural food production seriously, she began to see connections that most people never consider.

What we put on our land affects what we grow. What we grow affects what we eat. What surrounds us affects how we feel. That same thinking applied to the home led her somewhere unexpected. Personal care products. Building materials. Indoor air quality. Electromagnetic fields.

Each thread connected to the same idea: that a home, like skin, is a living interface between you and your environment. When something is wrong with it, your whole body feels it. Of all the factors that affect health inside a home, one kept coming up above the rest. Mould. It is common, it is largely invisible, and it is the thing that must be resolved before anything else can matter.

The work

Finding what others miss is not a claim. It is a track record.

Marijana has walked into properties after other trained professionals and found what they could not. Finding mould and moisture properly requires a rare combination: deep technical knowledge, continuous learning, multiple tools, and a dedication to looking until the answer is found.

She is mentored by experts in their fields, continuously researching, and has gone well beyond the requirements of her formal training. She serves as a committee member of the IAQAA (Indoor Air Quality Association Australia) and is genuinely invested in raising the standard of this work across the industry.

Most of her time is spent not on site, but at her desk: reviewing data, analysing laboratory results, and translating complex technical findings into reports that are clear, precise, and give you the full picture.

Why independence matters

Independent means independent.

The findings of any assessment reflect who commissioned it. When an insurer or remediator sends their own assessor, that person is not working for you. When you engage MJ Building Bio, every finding and every recommendation is there to support your needs. There is no relationship with any other party involved, no agenda to serve, and no reason to reach any particular conclusion. You get the full picture. Nothing more, nothing less.

Qualifications and memberships
Qualification

Building Biologist

Educated in the assessment of hazards in the built environment, with a whole-building approach to occupant health. Specialist training and ongoing mentorship from leaders in the field has taken this foundation well beyond its original scope.

Certification

Certified Mould Testing Technician

Specialist qualification in the detection, sampling, and assessment of mould and other microbial contamination in buildings.

Standards

AS-IICRC S500 and S520

All assessments reference AS-IICRC S500:2025 and AS-IICRC S520:2025 — the official Australian Standards for professional water damage restoration and mould remediation.

Membership

Committee Member of IAQAA

Indoor Air Quality Association Australia. An active role in setting and raising the standard for indoor environmental assessment in Australia.

Wildlife

WIRES Murray River Branch

Vice President and active wildlife carer with the Wildlife Information, Rescue and Education Service. Because the same care for living things applies everywhere.

Independence

No reason to reach any particular conclusion

MJ Building Bio has no relationship with any remediator or insurer involved in any assessment. Every report serves the client alone.

Service area

Two locations. One specialist.

MJ Building Bio operates from two locations — Barham in regional southern NSW and Melbourne — making specialist mould and moisture assessment accessible across Victoria and southern NSW.

Marijana covers a significant part of the region including many areas that are underserved by specialist assessors. Travel further afield is considered on request.

Victoria and Southern NSW
A note on remote work

Most of what Marijana does happens after the site visit. Data analysis, laboratory result interpretation, report writing, and consultation with builders, insurers, and other specialists can all be done remotely.

This means the geographic boundary of the physical inspection does not limit the quality or depth of the advice you receive. Once Marijana has been to your property, she is available to you regardless of where you are.

Ready to find out what is really going on?

Call or email Marijana for a straightforward conversation about what you are experiencing. No obligation, no pressure. Just honest advice from a specialist who works for you.

Phone0472 536 856 Emailinfo@mjbuildingbio.com.au
AreaVictoria and Southern NSW