Mould removal in Sydney: who pays, and what NSW law says

In a Sydney strata building or rental, the mould question that matters is who pays, and the answer turns on where the water came from. New South Wales law has specific answers for both, and they are more useful than any cleaning tip.

Who pays for mould in Sydney

The pattern in every row is the same: mould is the consequence, and the party responsible for the water is the party responsible for the mould. The two statutes below are what make that enforceable in Sydney.

Strata: the owners corporation’s duty and your right to damages

Most of the useful work is done by subsection (5). Where an owners corporation leaves common property — a roof, an external wall, a pipe in a boundary wall — unrepaired, a lot owner can recover, as damages for breach of statutory duty, any reasonably foreseeable loss suffered because of it. The clock is 6 years from when you first become aware of the loss, so keep the dated photographs and the correspondence with the strata manager.

That page does not mention mould, and no NSW Government page read for this site says in terms who pays for mould caused by a common-property leak. What it does say is who is responsible for the water, and mould is the water’s consequence. The strata page covers how the owners corporation’s building policy and your contents policy meet.

Renting in NSW: dampness, ventilation and urgent repairs

The Residential Tenancies Act does not use the word mould, but it does not need to. Premises are only structurally sound if floors, ceilings, walls and supporting structures are not subject to significant dampness (Residential Tenancies Act 2010 (NSW) s 52(1B)(b)), and fit for habitation only with adequate ventilation and adequate plumbing and drainage. Mould from rising dampness or a bathroom with no working exhaust is the kind of condition those words address; whether a particular case meets them is a question for the NSW Civil and Administrative Tribunal, not this site.

Two practical consequences. Report mould and its cause in writing as soon as you see it: NSW Fair Trading says tenants must notify the landlord or agent as soon as possible if they see signs of mould or damp. And if the cause is an urgent repair — a burst water service or a serious roof leak — and the landlord cannot be reached, the $1,000 cap is what you can spend on a licensed tradesperson and get back.

Sydney’s damp months

June is the wettest month on the Sydney Airport record, with a mean 9am humidity of 74% against 69% for the year. Damp air slows drying because it cannot take up much more moisture, so a leak in a Sydney winter stays wet longer and gives mould more time. That is an argument for getting the drying started quickly, and for a restorer who measures rather than guesses when the building is dry.

Cleaning it: NSW Health’s method

NSW Health is the Sydney reader’s own health department, and its factsheet gives a specific household method: mild detergent or four parts vinegar to one part water first; 250 mL of bleach in 4 litres of water only for items you cannot discard, with gloves, eye protection and ventilation. Absorbent materials such as carpet may need to be professionally cleaned or replaced. On testing it says that since most mould is visible, testing is generally not necessary. And the sentence that matters most: mould is likely to return unless you fix the cause (NSW Health, Mould factsheet). The mould removal guide sets NSW Health beside the Victorian, Queensland and Western Australian guidance.

What mould removal costs in Sydney

None of those figures is priced for Sydney specifically, and this site publishes no Sydney premium because none was read. The drying is usually the bigger number when there was a leak behind the mould: two rooms over five days with one HEPA unit is $2,669 excluding GST on the published rate card. In a strata building, ask the strata manager whether the owners corporation is engaging the restorer before you do.

Common questions