Mould remediation is not a regulated trade in Australia in the same way that electrical or plumbing work is. There is no single mandatory licence that all mould remediators must hold, and the industry has a spectrum of operators ranging from well-trained, properly equipped professionals to people with a spray bottle and a business card. In the Northern Rivers market, where demand for mould services is high due to the subtropical climate and post-2022 flood recovery needs, the quality range is wide.
Asking the right questions before you book can save you from spending thousands on treatment that is ineffective, incomplete, or in the worst cases, makes the problem worse by disturbing mould without proper containment.
Quick answer (BLUF)
A reputable Northern Rivers mould remediator will have formal training in mould assessment or remediation (IICRC, Cert IV, or equivalent), carry public liability and workers compensation insurance, use proper containment and air filtration equipment, be able to explain their method and products clearly, and provide written documentation of their findings and treatment. If a quote arrives without any of these elements, ask more questions or look elsewhere.
Question 1: What qualifications or training does the contractor have?
The gold standard in Australian mould remediation is training under the IICRC (Institute of Inspection, Cleaning and Restoration Certification) framework, specifically the Applied Microbial Remediation Technician (AMRT) certification. Some operators hold relevant qualifications through TAFE or vocational training (e.g. Cert IV in Building and Construction with relevant units) or have completed specialist mould training through organisations like Medimax or RIA Australia.
Ask specifically what training the people who will actually be doing the work have completed, not just the business owner. A company with a trained principal who sends untrained subcontractors to do the work is a risk.
Question 2: Do you carry public liability insurance and workers compensation?
This is non-negotiable. Any contractor working in your home should carry current public liability insurance (minimum $5 million is standard) and workers compensation for their employees. Ask to see the certificate of currency, not just a verbal assurance. If a remediator cannot provide current insurance documentation, do not engage them.
This matters particularly for mould remediation because the work involves chemical treatments and confined space entry, if something goes wrong, your liability exposure without contractor insurance is significant.
Question 3: Can you explain your containment and safety procedures?
Professional mould remediation of anything beyond minor surface treatment should involve containment, plastic sheeting to isolate the work area, and negative pressure air scrubbing with HEPA filtration to prevent spore dispersal to other parts of the home during work. If a contractor plans to scrub down mouldy walls without any containment in a home with people present, they are not meeting a professional standard of care.
Ask how they protect other areas of the home from cross-contamination. A confident, detailed answer is reassuring; a vague or dismissive response is a red flag.
Question 4: What will you do to confirm the scope of the problem before you start?
Professional remediation should begin with assessment, determining the location and extent of mould before treatment commences. This may involve moisture meter readings, visual inspection, thermal imaging, and in some cases air or surface sampling. Contractors who quote and begin work based only on what’s visible on a quick walk-through may miss hidden mould in cavities and wall structures.
Ask specifically: “How will you confirm whether there’s mould in the wall cavities or subfloor before you start? What happens if you find more than initially expected?” A professional process includes a scope adjustment mechanism; a fixed-price job that doesn’t allow for hidden extent can result in pressure to cut corners when more contamination is found.
Question 5: What products will you use, and what are their active ingredients?
Your remediator should be able to name the antimicrobial or antifungal products they use and provide basic information about the active ingredients. Products should be registered for use in residential applications in Australia. For food-contact or food-adjacent environments (kitchens, food storage areas), products must be appropriate for those settings.
Be wary of contractors who claim proprietary “secret” treatments or who cannot provide product documentation. You have a right to know what chemicals are being applied in your home, particularly if you have children, pets, or residents with chemical sensitivities.
Question 6: Will you provide a written report and documentation?
A professional mould remediation service should provide:
- A written scope of works before commencement
- A completion report documenting what was done, where, and with what products
- Photographs of before and after conditions
- Recommendations for post-remediation humidity management and maintenance
This documentation is important for insurance claims, landlord-tenant disputes, property sales, and confirming that the work was done to a professional standard. Contractors who resist providing written documentation are a red flag.
Question 7: Do you offer post-remediation testing?
Post-remediation verification, air quality testing after the work is complete, is the only objective way to confirm that remediation was effective. Some contractors include this as part of their service; others offer it as an optional addition. For major remediation projects, particularly in homes with vulnerable occupants or for commercial properties, post-remediation testing should be considered a mandatory component of the service.
Some remediators recommend using an independent assessor for post-remediation testing, this provides the most objective result since the assessor has no financial interest in the outcome of the test.
Red flags to watch for
- Providing a firm quote without any inspection of the property
- Claiming they can treat everything with fogging alone without any material removal
- Not wearing appropriate PPE during the assessment visit
- Quoting verbally only, with no written quote or scope of works
- Significantly underbidding other quotes (may indicate corners will be cut)
- Unable to explain their methodology in plain language
- No insurance documentation available
FAQs
Is there a licence required to do mould remediation in NSW?
There is no single mandatory mould remediation licence in NSW. However, remediators may need other licences depending on what the work involves, for example, a contractor doing partial demolition as part of remediation needs appropriate building licence endorsements. Always ask what licences the contractor holds relevant to the scope of work proposed.
How many quotes should I get for mould remediation?
Two to three quotes from different contractors is generally appropriate. Be cautious of accepting the lowest quote without understanding why it’s lower, underbidding often means either a less thorough job or an intention to add costs once work has started. Compare quotes on scope and method, not just price.
Can I ask for references from previous customers?
Yes, and a reputable contractor should be willing to provide them. For major jobs, asking for references from customers who had similar-scope work done is reasonable. Online reviews (Google, local Facebook groups) are also useful, search for the company name along with “Northern Rivers” or the relevant town.
What should I do if I’m not happy with the remediation result?
Communicate the concern to the contractor immediately in writing. Describe what the specific issue is, visible regrowth, ongoing musty odour, elevated air test results. A professional contractor should investigate and, if their work was at fault, remediate at no additional cost within a reasonable warranty period. If the contractor is unresponsive, contact NSW Fair Trading to explore options.