The short answer
- Ask first whether the inspector also quotes the remediation. Both models can be run honestly, but only an independent assessor can legitimately recommend no work at all.
- Without an outdoor control sample taken the same day, an indoor spore count is a number with no scale to read it against.
- Ask which laboratory analyses the samples, whether it holds NATA accreditation, how many samples the quoted price includes, and what each additional one costs.
- Moisture readings at named locations, photographs tied to those locations, a stated likely cause and a scope a trade can quote from are the minimum. A list of findings with no cause leaves you holding a list.
- Verification after remediation should not be carried out by the company that did the remediation.
- After a water event, start drying immediately rather than waiting on a report. Given the right conditions, mould can begin growing in around 48 hours.
A mould inspection is a document. That is the entire product. You cannot inspect the workmanship afterwards the way you can inspect a repainted wall, so the only real quality control happens before you book, in the questions you ask. Brisbane has capable inspectors, and the price tag does not reliably tell you which ones they are.
Ask who pays for the recommendation
The first question is structural, not personal: if this report recommends work, does your business do that work?
Both models exist and both can be run honestly. A full-service firm that inspects and remediates has genuine advantages, including continuity, a single point of accountability, and technicians who have seen what the assessor saw. The trade-off is that the person scoping the job is also the person pricing it.
An independent assessor sells you the report and nothing else. Their recommendation can legitimately be no work at all, or work carried out by someone they have never met. That independence is worth paying for when the scope looks large, when you are deciding whether to buy a house, or when an insurer is involved.
The same rule holds either way: verification after remediation should not be carried out by the company that did the remediation. Marking your own homework is not verification, and a confident firm will agree with that without argument.
The report is the product. If a competent trade could not act on it without ringing the author for clarification, it is not finished.
Outdoor control samples, or the numbers mean nothing
Outdoor air is full of fungal spores. So is the air inside every healthy house on the street. The working benchmark for a healthy home is an indoor fungal profile that broadly resembles the outdoor air around it, which means an indoor spore count on its own is a figure with no scale to read it against.
So ask whether the quote includes at least 1 outdoor control sample, taken the same day, in the same weather. Then ask how many indoor samples are included. A sample taken in the living room tells you about the living room. If the concern is the main bedroom and the ensuite, those rooms need their own.
Air sampling has limits worth understanding. It captures a moment. Spores are not evenly distributed, and an undisturbed room can read low while the same room reads high once someone moves through it, which is why sampling sits alongside a physical inspection rather than replacing it. I have written more about how damp behaves in this climate in the guide to mould and damp in Brisbane homes.
Which laboratory reads it, and who pays per sample
Samples get analysed somewhere. Ask where. In Australia the accreditation worth asking about is NATA, and a straightforward inspector will name the laboratory without hesitating.
Then ask how the laboratory fees are billed. A quote that looks noticeably cheaper than the others sometimes includes 1 sample, with every additional sample and its analysis charged on top. That is not dishonest if it is disclosed up front. It becomes a problem when you discover it at invoice stage. Ask for an all-in figure based on the number of samples you actually expect, and ask whether you receive the raw laboratory report or only the inspector's summary of it. You want both.
A finding is not a cause
A report that lists what was found and stops there leaves you holding a list. Elevated counts in a bedroom, staining behind a wardrobe, a high reading on a wall. None of that explains why, and mould is a moisture problem first. Until the moisture source is identified, anything done to the visible growth is temporary.
Ask what the report will contain. A useful one carries:
- moisture readings taken at named locations, not a general remark that the house felt damp
- photographs tied to those specific locations
- a stated likely cause, or an honest note that the cause could not be established and what further investigation would settle it
- a scope of works specific enough for a tradesperson to quote from
- a clear list of what was not accessible on the day and why
Thermal imaging deserves a note here. A thermal camera shows temperature difference, not moisture. It is a screening tool that tells an experienced operator where to put the moisture meter. A report leaning on colourful thermal images without confirming readings is showing you pictures of cold, not evidence of water.
Cause is also not always a leak. Moisture is generated inside the home every day by cooking, showering, drying laundry indoors and simply breathing, and in a closed-up house it has to go somewhere. Raised older housing has its own predictable failure points, which I cover in what to watch for in Queenslander homes. New builds are not exempt either: condensation can develop inside steel-framed wall cavities with nothing visible until it is well advanced.
Get the exclusions in writing
Comparing quotes is impossible until you know what each covers. Before booking, confirm:
- how many rooms are included, and whether that means the whole house
- whether the roof void and subfloor are inspected, and the conditions under which the inspector will decline to enter
- whether anything invasive is included, such as opening a wall cavity, and whether making good afterwards is your cost
- how many samples are included, and the price of each additional one
- turnaround time for the written report
- whether a follow-up inspection after works is charged separately
Ask about the report format too. Some are short and genuinely useful. Others wrap pages of boilerplate around the handful of pages that matter, and length is not the same as substance.
When you probably do not need an inspection
Honest answer: plenty of households ringing around for quotes do not need a laboratory to tell them what is happening. If there is visible growth on the bathroom ceiling, the exhaust fan vents into the roof void or nowhere at all, and the room stays wet for half a day after a shower, the cause is not a mystery. That money does more good spent on ventilation and on physically removing the growth.
Removal, not killing. Whether the mould is alive is not the measure of whether it is a problem, because dormant spores and dead material still matter. On non-porous surfaces a cloth, a detergent and real effort take it off. Bleach is a poor choice: it strips the colour while leaving growth in porous material, and it is mostly water, so it adds moisture to a problem caused by moisture. Porous materials are a different situation again, since growth extends below the surface, and depending on the material and the extent, sometimes the honest answer is that it has to come out.
After a burst hose, storm ingress or an overflowing washing machine, do not wait on an inspection before you start drying. Given the right conditions mould can begin growing in around 48 hours, and drying within hours rather than days is the single most useful thing anyone in the house can do.
An inspection earns its cost when growth keeps returning after proper removal, when there is staining or odour with no visible source, when you are buying, when an insurer or a tenancy dispute needs documentation, or when a health professional has asked questions about the home environment. Worth noting on odour: absence of smell is not reassurance. Mould does not have to be visible or smell, most significant problems have no smell at all, and nose blindness to the ones that do sets in within days.
A note on scope. I am a naturopath and clinical nutritionist, not a doctor, and nothing here is health advice. The World Health Organization and Queensland Health both treat damp and mould in buildings as an indoor air quality problem, and the guidance that follows is about the building: find the moisture, dry it, remove the growth. That is where this article stays. Anything to do with how someone in the house is feeling is a conversation for their GP.
What I do, and what I do not
Since this is a buyer's guide and I work in the industry, my own position should be clear. I am currently studying mould and moisture assessment. I do not offer mould testing, sampling or moisture readings, I do not write assessment reports, and I am not a remediator. Full remediation is specialist work and belongs with someone who does it properly.
What I do is clean. Surface mould gets physically removed where it is safe to do so as part of a clean, using fragrance-free products, the right brushes and genuine effort rather than harsh chemistry. A Home Health Review is a walkthrough, not a technical assessment: no meters, no samples, no laboratory. It looks at the ordinary conditions that let moisture and mould build quietly. The room that never fully dries. The wardrobe pressed against a cold external wall. The laundry habit putting water into the air every week. The dust, clutter and excess soft furnishings that feed growth, block airflow and hide the early signs. It is not a substitute for an inspection, and I will say so plainly when a home needs one.
If you want a set of eyes over your home with that lens, get in touch and I will tell you honestly whether the answer is a clean, a change of habit, or a call to an independent assessor.
Common questions
How much does a mould inspection cost in Brisbane?
Quotes vary widely and are often not comparable, because the headline figure may cover a single room or the whole house, and may include 1 laboratory sample or several. Ask for an all-in price based on the number of samples you actually expect, the rooms covered, and whether the roof void and subfloor are included. Comparing quotes is only meaningful once the scope behind each of them is the same.
Should the company that inspects also do the remediation?
They can, and plenty of full-service firms operate honestly, but the person scoping the work is then also the person pricing it. An independent assessor is paid for the report alone, so their recommendation can legitimately be no work at all. The same line holds either way: verification after remediation should not be carried out by the company that performed the remediation.
Does a mould inspection always include laboratory testing?
No, and it should be stated clearly in the quote. If samples are taken, ask which laboratory analyses them, whether it holds NATA accreditation, whether an outdoor control sample is included, and whether you receive the raw laboratory report as well as the inspector's summary. Analysis is frequently charged per sample on top of the inspection fee.
Is black mould more dangerous than other colours?
Colour tells you almost nothing useful. The same species can appear in different colours on different surfaces within the same room, and some moulds are effectively transparent. Black mould describes a colour, not a species, and identifying a species requires laboratory analysis rather than a look.
Can I just use bleach on it instead?
Bleach is a poor choice. On porous materials it removes the colour while leaving the growth in place, so the surface looks resolved when it is not, and bleach is mostly water, which adds moisture to a problem caused by moisture. The goal is physical removal rather than killing, since dead mould and dormant spores still matter. On non-porous surfaces a cloth, a detergent and genuine effort do the job.
I cannot smell anything, so is my home fine?
Absence of odour is not reassurance. Most significant mould problems have no smell at all, mould does not have to be visible, and nose blindness to a smell that is present sets in within days of living with it. Recurring growth, unexplained staining, or a room that stays damp are better signals than your nose.