Mould Remediation Guide

Yes. Black mould (Stachybotrys chartarum) produces mycotoxins that can cause respiratory issues, allergic reactions, headaches, fatigue, and in severe cases, neurological symptoms. However, all mould species can affect health — colour alone does not indicate toxicity. People with asthma, allergies, compromised immune systems, and young children are most vulnerable. Any visible mould growth larger than 1 square metre should be professionally assessed and remediated by IICRC-certified technicians using containment and HEPA filtration to prevent spore spread during removal.

Professional mould remediation in Australia typically costs $1,500–$8,000+ depending on the extent and location. Small areas (under 1 sqm, surface mould on accessible walls) cost $500–$1,500. Moderate infestations (1–10 sqm, behind walls or in ceiling cavities) cost $2,000–$5,000. Large-scale remediation (structural mould, entire rooms, HVAC contamination) can exceed $8,000–$15,000. The Disaster Recovery platform fee is $550 with $2,200 held for your contractor. Costs increase when mould is in concealed areas requiring demolition for access. Payment plans are available through Equipped Commercial Finance.

Mould removal is covered by most Australian insurance policies only when the mould results from a covered event — such as a burst pipe, storm damage, or firefighting water. Mould from gradual moisture buildup, poor ventilation, condensation, or maintenance neglect is almost always excluded. To maximise your claim: document the original water event, report promptly (mould from a covered event reported months later may be disputed), and get a professional mould assessment linking the growth to the insured event. We provide full documentation to support your insurance claim.

Small areas of surface mould under 1 square metre on non-porous surfaces (tiles, glass, metal) can be cleaned with a solution of 80% white vinegar and 20% water. However, professional remediation is essential when: mould exceeds 1 sqm, mould is on porous materials (gyprock, timber, carpet), mould is in concealed spaces (wall cavities, ceiling voids), occupants have health symptoms, or the moisture source has not been identified. DIY cleaning of large mould areas without proper containment can spread millions of spores through your HVAC system, making the problem significantly worse.

Mould returns for three main reasons: (1) The moisture source was not identified and fixed — mould is a symptom of excess moisture, not the root cause. Common hidden sources include subfloor moisture, condensation in wall cavities, leaking pipes behind walls, and inadequate ventilation in bathrooms and laundries. (2) Surface cleaning only removed visible mould but left the root system (hyphae) embedded in porous materials like gyprock and timber. (3) Spores were spread during DIY cleaning and colonised new areas. Professional remediation addresses all three by identifying and fixing the moisture source, removing contaminated materials, and using HEPA containment to prevent cross-contamination.

Mould can begin growing within 24–48 hours of water damage in the right conditions (moisture above 60% RH, temperature 20–30°C, organic material to feed on). Visible mould colonies typically appear within 3–7 days. By 14 days, mould can penetrate deep into gyprock, timber, and carpet underlay, making remediation significantly more complex and expensive. This is why the IICRC standard requires water damage drying to begin within 24 hours — preventing mould growth is far cheaper than remediating an established infestation.