The most common question we get before a quote is “how much does mould remediation cost in Wollongong?” The honest answer: it depends on scope, severity and access. But that’s not useful on its own, so this guide breaks down realistic price ranges for every common scenario in the Illawarra region, with what each price range includes.
All prices are in AUD and current for 2026 based on typical labour and material costs in the Wollongong and Illawarra market.
What Drives Mould Remediation Cost
Before looking at the numbers, the factors that most significantly affect price:
Area of mould, the most obvious factor. More affected area = more labour and treatment materials.
Material affected, mould on ceramic tiles costs far less to treat than mould in wall cavities with plasterboard replacement, and mould in structural framing is more expensive again.
Accessibility, subfloor voids with low clearance, roof voids in complex roof shapes, and inner-city Wollongong properties with difficult vehicle access all increase labour cost.
Mould severity and species, light surface mould is one day’s work. Heavy mould with suspected Stachybotrys requires containment, specialist PPE and specific disposal protocols, all adding cost.
Concurrent moisture source work, if the moisture source requires plumbing, waterproofing or building repairs, that work is quoted separately from the mould remediation and adds to total cost.
Post-remediation testing, professional clearance testing is an additional $300-$600 and is always recommended.
Price Guide by Scope
Inspection Only
| Service | Price Range AUD |
|---|---|
| Visual mould inspection | $200 to $400 |
| Moisture mapping with meter | Included in above |
| Thermal imaging scan | $300 to $600 (standalone) |
| Air quality / spore sampling + lab | $400 to $800 |
| Full inspection package | $400 to $900 |
An inspection before remediation is always worthwhile, it prevents paying for the wrong remediation scope.
Bathroom Mould Remediation
| Scope | Price Range AUD |
|---|---|
| Tiles and grout (surface only, no wall cavity) | $400 to $800 |
| Bathroom ceiling mould | $300 to $600 |
| Bathroom + ceiling combined | $600 to $1,200 |
| Shower niche and silicone replacement + treatment | $800 to $1,800 |
| Bathroom with minor cavity access | $1,200 to $2,500 |
| Bathroom full strip, waterproofing failure | $4,500 to $9,000 |
Single Room
| Room Type | Price Range AUD |
|---|---|
| Bedroom, surface mould, no cavity | $500 to $1,200 |
| Bedroom, wall cavity involvement | $1,500 to $4,000 |
| Lounge/living, surface | $600 to $1,500 |
| Kitchen, surface + under-sink | $600 to $1,500 |
| Laundry, surface + behind cabinetry | $500 to $1,200 |
Whole-House Remediation
| House Size and Scope | Price Range AUD |
|---|---|
| 2 bedroom unit, surface mould multiple rooms | $2,000 to $4,500 |
| 3 bedroom house, surface mould | $3,000 to $6,000 |
| 3 bedroom house, some cavity involvement | $5,000 to $10,000 |
| 4+ bedroom house, multiple areas | $6,000 to $15,000 |
| Severe mould, structural involvement | $12,000 to $30,000+ |
Subfloor and Roof Void
| Scope | Price Range AUD |
|---|---|
| Subfloor mould treatment, good access | $1,200 to $2,500 |
| Subfloor treatment, poor access | $2,000 to $4,500 |
| Subfloor + vapour barrier installation | $2,500 to $5,000 |
| Roof void mould treatment | $1,500 to $3,500 |
| Combined subfloor + roof void | $3,500 to $8,000 |
Antimicrobial Fogging
| Property Size | Price Range AUD |
|---|---|
| Apartment or unit | $400 to $900 |
| 3 bedroom house | $600 to $1,200 |
| 4+ bedroom house or large property | $900 to $2,000 |
Fogging is an adjunct to remediation, not a standalone treatment for structural mould. It significantly reduces residual airborne spore counts after structural remediation.
Post-Remediation Clearance Testing
| Service | Price Range AUD |
|---|---|
| Clearance air samples (2-3 samples) | $300 to $600 |
| Full clearance test with report | $400 to $800 |
What’s Included in Professional Remediation
A reputable Wollongong mould remediation company’s quote should include:
- Pre-work visual inspection and scope confirmation
- Containment (plastic sheeting, negative air if needed)
- HEPA vacuuming of mould-affected surfaces
- Antimicrobial treatment of all surfaces within scope
- Disposal of mould-affected materials (plasterboard, insulation, etc. if removing)
- Application of appropriate penetrating fungicide on porous materials
- Final HEPA vacuum and surface wipe-down
- Written scope confirmation and post-work report
It should NOT include post-remediation clearance testing (this is best done independently) or repair work such as replastering, painting or plumbing.
How to Compare Quotes
When comparing quotes from Wollongong mould remediators:
- Confirm all quotes cover the same scope, a cheap quote may omit containment, HEPA vacuuming or post-work reporting
- Ask whether the company is insured (public liability minimum $10 million is standard)
- Confirm the products used are appropriate for the surfaces, some cheaper quotes use bleach-based products that bleach porous materials without actually resolving the mould
- Check whether cavity access is included if wall mould is suspected
- Ask about post-remediation clearance, do they offer it, facilitate it, or leave it entirely to you?
Common Extras to Budget For
Plasterboard replacement, when wall cavity mould requires opening the cavity, affected plasterboard must be cut out and replaced. Typically $300-$800 per panel including patch, set and paint preparation.
Subfloor vapour barrier, if not included in the subfloor remediation quote, budget an additional $500-$1,500 depending on subfloor area.
Silicone replacement, bathroom silicone joints that are mould-affected should be replaced, not just treated. Budget $150-$400 for a bathroom re-silicone.
Exhaust fan replacement, if the exhaust fan is inadequate or venting incorrectly, budget $200-$500 for a replacement and re-ducting to external.
Subfloor ventilation system, if inadequate subfloor ventilation is the moisture source, a fan system adds $800-$2,500 to the total.
Insurance and Payment
Most Illawarra residents are out-of-pocket for mould remediation unless it results from an insured event (storm, burst pipe). See our complete guide on making an insurance claim for mould remediation.
Payment plans for remediation work are available from some providers, see our guide on payment options for mould removal.
Frequently Asked Questions
Why do two quotes for the same job differ by $2,000? The most common reasons: different scope (one includes cavity access, one doesn’t), different containment approach (one uses proper containment, one doesn’t), different product quality, and overhead differences between operators. Always compare on identical scope items. The cheapest quote is not always the worst value, but it requires careful scope comparison to know.
Does the price increase in escarpment suburbs like Clifton or Helensburgh? For properties with difficult access, steep driveways, limited parking for equipment vehicles, low subfloor clearance in a sloped site, yes, an access premium is reasonable. Typically 10-20% above flat-site pricing.
Is GST included in the prices in this guide? No. The ranges above are ex-GST. Add 10% GST to all quoted figures. An $800 bathroom remediation becomes $880 with GST.
How long does remediation take? Bathroom or single room: 4-8 hours (one day). Multi-room: 1-2 days. Whole house with subfloor and roof void: 3-5 days. Drying time between treatment and clearance testing adds another 24-48 hours.
Can I negotiate on mould remediation quotes? Yes, within reason, particularly if you have multiple areas of work (combining bathroom + subfloor in one mobilisation saves travel cost) or are a repeat customer (investment property portfolio). What you cannot negotiate on is scope, asking for a cheaper job by cutting containment or HEPA procedures produces lower-quality outcomes.
Ready for a precise quote for your specific situation? Contact Illawarra Mould Removal for a thorough assessment and a transparent, itemised quote.