Discovering mould in your home is stressful. The first question most Melbourne homeowners ask is: how much will it cost to get rid of it?
The honest answer is that mould removal costs vary widely — from a few hundred dollars for a small patch to tens of thousands for severe contamination. The variables that drive cost include the size of the affected area, the type of mould, where it’s growing, and whether it’s penetrated structural materials.
This guide breaks down realistic mould removal costs in Melbourne so you know what to expect before calling in a professional.
Mould Removal Cost Breakdown
Here are typical price ranges for professional mould removal in Melbourne as of 2026:
Small Area (under 1 square metre)
Cost: $500 – $1,500
A single patch of mould on a bathroom ceiling, around a window frame, or behind furniture. Surface mould that hasn’t penetrated into the wall cavity. This is the most common type of residential mould job. Treatment involves surface cleaning with antimicrobial agents, drying, and sealing.
Medium Area (1 – 10 square metres)
Cost: $1,500 – $5,000
Mould covering a full wall, multiple rooms, or areas where water damage has spread behind surfaces. May require removal of affected plasterboard, carpet, or insulation. Containment barriers are set up to prevent spore spread during removal.
Large Area (10+ square metres)
Cost: $5,000 – $15,000+
Major mould contamination affecting multiple rooms, subfloor areas, wall cavities, or roof spaces. Often the result of prolonged leaks, flooding, or poor ventilation. Requires full containment, HEPA air filtration, material removal, structural drying, and post-remediation testing.
Mould Testing and Inspection
Cost: $300 – $800
Professional mould inspection including visual assessment, moisture mapping, and air or surface sampling. Lab analysis identifies the type of mould present and whether it’s a health risk. Many remediation companies include a basic inspection in their quote, but independent testing is recommended for severe cases or insurance claims.
What Factors Affect the Cost?
No two mould jobs are identical. The main factors that determine your final cost are:
Type of Mould
Not all mould is created equal. Surface mould like Cladosporium is common and relatively straightforward to remove. Black mould (Stachybotrys chartarum) is more dangerous and more difficult to remediate because it typically grows on wet materials over extended periods, meaning deeper contamination.
However, colour alone doesn’t determine danger — a professional mould inspection can identify what you’re dealing with.
Location and Accessibility
Mould in an open bathroom is cheaper to treat than mould inside a wall cavity, under floorboards, or in a ceiling space. Hidden mould requires demolition to access, containment to prevent spread, and rebuild costs once remediation is complete.
Melbourne’s older housing stock — particularly pre-1990s brick veneer and weatherboard homes — is especially prone to mould in wall cavities due to inadequate vapour barriers and ventilation.
Cause of the Mould
Removing mould without fixing the underlying moisture source is pointless — it will grow back within weeks. The cost of fixing the cause (leaking pipes, poor drainage, inadequate ventilation, rising damp) is separate from the remediation cost but needs to happen simultaneously.
Common moisture sources in Melbourne homes:
- Leaking shower recesses (the single most common cause in bathrooms)
- Subfloor moisture with no vapour barrier
- Blocked or inadequate guttering causing water ingress
- Condensation from poor ventilation — particularly in newer, well-sealed homes
- Flood or storm damage that wasn’t properly dried
Materials Affected
Hard, non-porous surfaces (tiles, glass, metal) can usually be cleaned and retained. Porous materials that have absorbed mould — plasterboard, carpet, timber framing, insulation — often need to be removed and replaced. Material replacement adds significantly to the total cost.
Can You Remove Mould Yourself?
For small patches of surface mould (under a square metre on hard surfaces), DIY cleaning is reasonable. Use a dedicated mould removal product or a solution of white vinegar, and ensure the area is well-ventilated while you work.
Do not attempt DIY removal if:
- The mould covers more than one square metre
- The mould is on porous materials (plasterboard, carpet, timber)
- The mould is black, dark green, or has a musty/earthy smell
- You can see mould in wall cavities, ceiling spaces, or subfloor areas
- Anyone in the household has asthma, allergies, or a compromised immune system
- The mould keeps returning after you’ve cleaned it
In these situations, professional remediation is the safer and more cost-effective option — DIY attempts often spread spores to unaffected areas, making the problem worse.
Is Black Mould Dangerous?
Black mould gets a lot of attention, and for good reason. Stachybotrys chartarum produces mycotoxins that can cause:
- Persistent coughing, wheezing, and respiratory irritation
- Sinus congestion and frequent headaches
- Eye and skin irritation
- Fatigue and difficulty concentrating
- Worsening of asthma and allergic conditions
- More severe reactions in children, the elderly, and immunocompromised individuals
However, all mould types can cause health issues if exposure is prolonged or the person is sensitive. Don’t wait for lab results to confirm it’s “the bad kind” before taking action — any visible mould growth in your home should be addressed.
Does Insurance Cover Mould Removal?
It depends on the cause:
- Sudden events (burst pipe, storm damage, flooding) — typically covered under home and contents insurance. You’ll need to demonstrate the mould resulted directly from the insured event.
- Gradual damage (slow leaks, condensation, poor maintenance) — generally not covered. Most policies exclude mould caused by lack of maintenance or gradual deterioration.
- Rental properties — landlords are responsible for ensuring the property is habitable. If mould results from a structural issue (not tenant behaviour), the landlord typically bears the cost.
If you’re making an insurance claim, independent mould testing and a professional remediation report strengthen your case significantly.
How to Prevent Mould Coming Back
Once you’ve paid for mould removal, the last thing you want is a repeat. Prevention is straightforward:
- Fix moisture sources immediately — don’t delay plumbing repairs, gutter cleaning, or waterproofing work
- Ventilate wet areas — use exhaust fans in bathrooms and kitchens, and open windows when weather permits
- Monitor humidity — keep indoor humidity below 60%. A $20 hygrometer from Bunnings will tell you where you stand
- Dry wet areas within 48 hours — mould can begin growing on wet surfaces within 24–48 hours
- Improve airflow — move furniture away from external walls, ensure wardrobes have ventilation, and consider subfloor ventilation for older homes
Professional Mould Removal in Melbourne
TACT Biorecovery provides professional mould removal and remediation services across Melbourne. We handle everything from initial inspection and testing through to full remediation and post-clean verification.
Our team is trained in safe mould removal practices, and we address the root cause — not just the visible growth — so the problem doesn’t come back.
Call 1300 228 228 for a mould inspection quote, or get in touch online.