Spring Cleaning: How to Check for Mould Your Winter Might Have Left Behind

The heater’s off, the windows are finally staying open, and the house has stopped smelling faintly of damp wool.

It’s tempting to treat that as the end of it — but a Melbourne winter’s worth of closed-up, humid living leaves things behind that a warmer, drier spring doesn’t automatically undo on its own, and most of it is sitting in the handful of spots nobody thinks to check once the weather turns.

Why Spring Is the Right Time to Actually Check

Winter creates the conditions; spring is when the evidence is easiest to find without the confounding factors of active heating and permanently shut windows. Musty smells that were masked by constant heating and closed-up rooms often become more noticeable once the house starts ventilating properly again — which makes early spring a genuinely useful window to check before the smell fades into “just how the house smells” and gets ignored for another year.

The Roof Cavity Check

If downlights, exhaust fans, or a roof access manhole are part of the house, the roof cavity is worth a look, or at minimum a check for brown or yellowish staining spreading across ceiling paint from below. Roof-space condensation accumulates quietly over a cold season and is one of the last places most people think to check, precisely because nobody looks up there without a reason to.

The Subfloor Check

Underneath the house is the other commonly skipped spot. Subfloor moisture from a wet winter — blocked vents, poor drainage, high water tables — doesn’t necessarily dry out on its own once the weather improves, especially where vents have been blocked by garden growth or debris over winter and never cleared. A quick check that vents are actually clear is a five-minute job that a genuine problem underneath is not.

The Rooms That Stayed Shut All Winter

Spare rooms, wardrobes, and any space that spent winter closed off and unheated are worth a specific look, since these are exactly the conditions — cool, still, low airflow — that let moisture settle without anyone noticing. A corner that felt slightly damp in July is worth rechecking now that it’s easier to tell whether that dampness actually cleared or just became less obvious once the room warmed up.

What a Spring Check Is Actually Looking For

The goal isn’t a full inspection — it’s noticing the signs winter tends to produce: a musty smell that doesn’t shift with ventilation, staining on ceilings or skirting boards, or a patch that looks like it’s been there longer than the two weeks since anyone last really looked. Any of those is worth a closer look rather than a shrug now that the season’s changed.

Conclusion

Spring doesn’t automatically undo what a Melbourne winter left behind — it just makes the evidence easier to spot, and easier to keep ignoring if nobody actually looks. A short walk-through of the roof cavity, subfloor vents, and any room that stayed shut over winter is worth the half hour it takes. If anything turns up that a quick check and some ventilation doesn’t resolve, a mould inspection is the next sensible step.

Frequently Asked Questions (FAQs)