Office mould in the Illawarra is one of those workplace issues that starts small and escalates quickly once staff start connecting their symptoms to the building. An employer who moves promptly, documents thoroughly and brings in a credible assessment resolves most complaints before they become disputes. An employer who dismisses the complaint or delays the inspection rarely avoids a longer and more expensive outcome. Our mould smell, headache and fatigue guide explains what occupants typically notice before mould is visible.
Quick answer (BLUF)
When a staff member raises a mould or sick-building concern, the appropriate employer response is to investigate promptly, document the finding, and arrange a qualified mould inspection if there is any visible growth or persistent musty odour. This is not about panic: most office mould has a fixable building cause. It is about good-faith action and a defensible record. Refer all health questions to a GP or occupational health professional, not to internal management. This page is not legal or occupational-health advice.
Why offices concentrate mould complaints
Office buildings concentrate the conditions that encourage mould complaints: a large number of people breathing in the same shared air, HVAC systems that recirculate that air across multiple floors and zones, and tenancies that change over time without consistent building maintenance.
In older Wollongong CBD stock, common mould sources include roof membranes that have deteriorated, bathroom exhaust fans that vent into ceiling voids rather than outside (see bathroom exhaust fan mould), and air-conditioning systems that collect condensate without adequate drainage. In newer commercial buildings, HVAC condensate pans and duct lining are the most frequently overlooked sources.
Staff in open-plan offices may notice a musty smell concentrated near particular vents or walls. Window offices on wind-exposed faces of high-rise buildings can see window-seal failures that allow rainwater ingress, particularly in north-facing Wollongong CBD apartment and office buildings that receive coastal weather.
SafeWork NSW duties in plain terms
Employers in NSW have a duty to provide and maintain a safe working environment. That duty extends to the physical condition of the workplace, including indoor air quality. This page does not quote specific legislative clauses, and it is not a substitute for qualified legal or WHS advice. For the applicable duties, refer directly to SafeWork NSW.
In practical terms, the duty means:
- Taking mould and air-quality complaints seriously and investigating them promptly
- Not dismissing health complaints as unrelated to the building without an investigation
- Keeping a record of complaints received, actions taken and outcomes
- Consulting with staff, particularly those directly affected, before and during any remediation works
The Safe Work Australia, indoor air quality guidance provides useful context on ventilation, air quality parameters and employer obligations without being prescriptive about specific mould thresholds.
First-response: what an employer should do
Within the first 24 to 48 hours of receiving a mould complaint, the practical steps are:
- Take the complaint in writing. Ask the staff member to describe what they have observed, where, and when symptoms (if any) were noticed.
- Inspect the area visually. Is there visible growth, a musty odour, or water staining that suggests an active moisture source?
- If growth is visible or the odour is persistent, do not attempt to clean it yourself before an inspection. Disturbing mould without containment spreads spores.
- Arrange a qualified mould inspection and testing service. The inspection should cover not just the visible area but the HVAC system, ceiling void above the affected space, and any adjacent wet areas.
- Communicate with the affected staff member that an inspection has been arranged. Give a timeline.
Scoping a commercial mould inspection
A commercial mould inspection for an office differs from a residential job in a few key ways. The HVAC system is often the primary vector, not the building envelope. The inspector needs access to plant rooms, ceiling void access panels, and the inside of air-handling units.
A well-scoped commercial inspection covers:
- All visibly affected areas plus a defined buffer zone
- HVAC air-handling units, condensate pans, and ductwork in the affected zone
- Bathroom exhaust fan termination points
- Roof membrane and drainage in the zone above the complaint area
- Moisture readings across wall, floor and ceiling materials
- Air sampling if warranted by extent or health complaints
Our mould inspection and testing service covers commercial scopes. The mould assessment report explained guide sets out what a credible inspection report should contain, which is important when presenting findings to a building owner or landlord.
For employers in leased premises, the report serves two purposes: it identifies the cause (which may be a common-property building defect, not a tenant fitout issue), and it provides a defensible record of employer action if a complaint escalates.
For indoor air quality testing as part of a broader sick-building investigation, an occupational hygienist is the appropriate professional, not a general mould contractor.
Communicating with staff during works
How an employer communicates during a mould investigation matters. Staff who are kept informed are far less likely to escalate a complaint to regulators or the media than those who feel dismissed or misled.
Practical communication steps:
- Notify all staff in the affected area that an inspection has been arranged and give the expected date
- After the inspection, advise staff of the findings at a level of detail that is accurate without being alarmist
- Before any remediation works, advise on the scope, the duration, and whether the space will remain occupied
- After works are complete, confirm what was found, what was done, and what ongoing monitoring is planned
Avoid vague language such as “we found nothing of concern” if the inspection did find mould but at a level the assessor judged to be minor. Staff who later discover that mould was found and not disclosed tend to escalate.
When to bring in occupational hygiene support
A standard mould inspection identifies and scopes visible growth. An occupational hygienist can go further: assessing whether the indoor air quality poses a health risk, reviewing HVAC design, and providing health-based guidance on whether the space is safe for occupation during or after remediation.
Occupational hygiene support is worth considering when:
- Multiple staff members report similar symptoms and a common area or time of day is implicated
- Air sampling shows elevated spore counts but the source is not immediately apparent
- The space is used by people with known respiratory conditions or immune vulnerabilities
- A WorkCover or regulatory inquiry is likely
The work environment guides for childcare school mould cover similar territory for education settings where vulnerable occupants are involved.
For a straightforward visible-growth scenario with a clear moisture source, a qualified mould inspector and a reputable mould remediation contractor are usually sufficient. For complex or disputed cases, an occupational hygienist adds a layer of independent technical authority. Book an assessment at /contact/#quote.
FAQs
Do I need to close the office for a mould inspection?
Not necessarily. A visual inspection with moisture meter readings can usually be done in an occupied office outside working hours or with minimal disruption during the day. Air sampling requires the space to be undisturbed for a set period before sampling, which may mean a short after-hours window. Your inspector will advise based on the scope.
A staff member is threatening to call SafeWork NSW. What should I do?
Take the complaint seriously, document everything you have done, and accelerate the inspection timeline. SafeWork NSW investigates complaints where an employer has failed to take reasonable action. An employer who has a documented inspection underway and is communicating with staff is in a much better position than one who has not responded.
My building owner says the mould is the tenant’s problem. Is that right?
It depends on the lease and the source of the mould. If the moisture source is a building-envelope defect, a roof failure or a shared HVAC system, that is typically a landlord or building-management responsibility. The inspection report identifying the cause is key evidence in that conversation. An employer’s WHS duty to staff does not change based on who is responsible for the building defect.
How long does a commercial mould remediation job take?
A single-room or single-zone office job typically runs one to two days, assuming access is available and drying does not require an extended period. HVAC-related jobs can take longer if ductwork cleaning or plant-room access is involved. Expect a realistic programme from your contractor before works begin.
Do I need to tell the landlord before booking an inspection?
Reviewing your lease is advisable before instructing physical investigation that requires access to ceiling voids or plant rooms, as most commercial leases require landlord consent for works beyond routine maintenance. A visual inspection of the tenancy itself, without accessing common-property spaces, typically does not require prior notice. Check your lease conditions or speak with your solicitor.
Related reading
- Mould smell, headache and fatigue: what it might mean
- Indoor air quality testing and mould
- What a mould assessment report should contain
- Bathroom exhaust fan mould: the roof cavity trap
- Balcony and window mould in Wollongong CBD apartments
- Mould in childcare centres and schools, NSW
- What to expect on a mould inspection day
- Mould inspection and testing service
- Mould remediation service
- Wollongong service area