A mould inspection is a moisture investigation: it finds where the water is coming from, maps how far growth has spread, and turns that into a written scope for the fix. If you keep cleaning the same patch, or you can smell damp but cannot see it, an inspection is usually the right first step. Illawarra Mould Removal passes your enquiry to an independent local remediation professional, who carries out the inspection and quotes in their own name.
What an inspection involves
A useful inspection goes room by room and measures, rather than relying on what looks dry:
- Moisture meters on walls, skirtings, ceilings and floors, to map damp behind paint and tiles.
- Thermal imaging where useful, to show cold, damp zones behind plasterboard and around windows without cutting holes.
- Humidity and dew-point readings, because much household mould on the coast is condensation on cold surfaces rather than a leak.
- The building envelope: gutters, roof lines, weep holes, subfloor vents, exhaust fans, window seals and site drainage.
- Subfloor and roof void, where safe access exists. These are the two places hidden mould most often sits.
You should come away with a written report: what was found, the likely moisture source, photos and readings, and a recommended scope. Our guide to what a professional mould assessment report contains walks through that document if you want to know what to expect.
Testing: when lab sampling is worth it
Laboratory sampling is optional. Where mould is visible, or you simply want the cause found and the work quoted, the moisture map does the diagnostic job on its own.
Sampling earns its place when you need documented evidence:
- a rental dispute or a claim at the tribunal
- an insurance claim
- a pre-purchase decision
- confirming a large remediation job reached its completion standard
An air sample compares what is airborne indoors with an outdoor control taken the same day; a tape lift or swab identifies what a specific visible patch is. Both are snapshots, affected by weather, open windows and recent cleaning, and neither is a health assessment. Our guide to indoor air quality testing for mould sets out when sampling changes the decision and when it only adds cost.
When to book one
- Mould keeps coming back after cleaning. The source has not been found. Common causes are condensation on cold walls, blocked subfloor vents, roof or flashing leaks, and exhaust fans venting into the ceiling cavity.
- A musty smell with nothing visible. Often the subfloor or roof void, especially in older raised-floor homes.
- You are buying. A mould and moisture inspection sits alongside, not instead of, a standard building inspection. See our pre-purchase mould inspection guide.
- You rent or own a rental. An independent report with readings and photos is far stronger evidence than phone photos. Our guide to mould claims for NSW tenants explains how responsibilities generally sit.
- After a leak, storm or flood, to check whether drying actually finished.
NSW Health’s mould factsheet notes that mould is likely to return unless the cause is also treated. Finding the cause is the whole purpose of an inspection.
How it works
- Describe the problem through the quote form: what you can see and smell, which rooms, and your suburb. You will get an honest read on whether a full inspection is needed or whether the problem is obvious enough to quote treatment directly.
- The inspection is booked directly with the independent local professional, including subfloor and roof void access where it is safe.
- Optional sampling goes to an independent laboratory if it is warranted.
- The written report covers findings, readings, the moisture source and a prioritised scope, from ventilation and drainage changes through to whole-home remediation.
- A quote for any work. There is no obligation to proceed, and the report is yours to use with any contractor.
What drives the cost
There are no fixed prices here, because the fee depends on the property and the report you need. The main drivers are house size, access (tight subfloors, steep blocks, two storeys), whether lab sampling is included and how many samples, and how detailed the report must be: a tenancy or pre-purchase report takes longer than a homeowner scope. Creating new access, such as cutting a subfloor hatch, is quoted separately and done by a licensed builder. The mould removal cost guide explains these drivers across all job types.
Frequently asked questions
Do I need mould testing or just an inspection?
Usually just the inspection. Moisture mapping identifies the cause and extent in most homes; lab sampling is worth it when you need independent documented evidence for a dispute, a purchase or a post-remediation check.
Why does mould keep coming back after I clean it?
Cleaning removes the growth, not the moisture feeding it. Until condensation, a leak or poor ventilation is fixed, the same patch will regrow.
Can a rental property be inspected?
Yes, at the request of either a tenant or a landlord. The report records readings and photos; it is not legal advice, and NSW Fair Trading publishes guidance on rights and repairs.
Will the inspector go into the subfloor and roof cavity?
Where safe access exists, yes. If access is too tight or unsafe, the inspector records what can be seen and recommends how to create proper access.
Is the inspection fee credited if I go ahead with remediation?
That depends on the independent contractor quoting the work. Ask when you book and get the answer in writing before you commit.
Book a mould inspection
Use the Get a Free Quote form: describe what you can see and smell and add your suburb, and you will get a straight answer on whether an inspection or direct treatment is the right next step.
quote form