Mould in Winter

What Every Property Owner Needs to Know

Winter is tough on buildings. As temperatures drop and we seal ourselves indoors, the conditions that allow mould to thrive quietly take hold — often going unnoticed until the damage is already done.

Whether you manage a hotel, office, warehouse, retail space, or residential property, mould is a risk you can’t afford to ignore. Here’s what causes it, why it matters, and how to stay ahead of it this season.

Why Winter Is Prime Time for Mould

It comes down to one thing: moisture meeting cold surfaces. When warm indoor air hits cold windows, walls, or ceilings, condensation forms. Add limited airflow and reduced ventilation, and you’ve created the ideal environment for mould spores to take hold. Common winter triggers include:



Poor ventilation in bathrooms, kitchens, and change rooms



Leaking roofs, pipes, or windows allowing water ingress



Drying laundry indoors without adequate airflow



Blocked gutters or drainage causing damp to build up



High indoor humidity levels — especially in sealed or poorly insulated spaces

The Real Cost of Mould

Mould is easy to dismiss as a surface problem. It’s not. Left untreated, it can cause:

Persistent musty odours that are difficult to eliminate
Structural damage to walls, ceilings, paintwork, and furnishings
Declining indoor air quality throughout your premises
Respiratory irritation and allergic reactions, particularly in vulnerable individuals
Expensive remediation work if moisture issues are left unresolved

For businesses, the stakes are even higher. Visible mould signals neglect to customers and creates an unhealthy environment for staff — both of which carry reputational and legal risk.

5 Ways to Protect Your Property This Winter

The good news: mould is largely preventable with the right approach.



Prioritise ventilation: Use extractor fans consistently in high-moisture areas. Where possible, open windows during the day to allow fresh air to circulate — even briefly in cold weather.



Fix leaks without delay: A minor roof or plumbing leak can quickly create the damp conditions mould needs to spread. Address any water ingress as soon as it’s identified, not when it’s convenient.



Keep humidity in check: Indoor humidity above 60% significantly increases mould risk. Dehumidifiers are a practical solution for poorly ventilated spaces, particularly basements, storage areas, and change rooms.



Wipe down condensation quickly: If moisture appears on windows or walls, dry it promptly. Leaving it sitting — even briefly — gives mould a foothold.



Schedule professional inspections and cleaning: Regular deep cleaning and maintenance checks are one of the most effective ways to catch moisture problems early — before mould has a chance to spread. A professional team will identify contributing factors that are easy to miss.

When DIY Isn’t Enough

If mould keeps returning after cleaning, or if you’re seeing growth across a large area, there’s likely an underlying moisture issue that surface-level treatment won’t fix. Painting over mould or wiping it down without addressing the source is a temporary fix at best.

Professional mould remediation involves safely removing contamination, identifying the root cause, and implementing preventative measures to protect your property long-term.

Keep Your Premises Healthy All Winter

A clean, healthy environment doesn’t happen by chance — it’s the result of consistent care and proactive maintenance. This winter, don’t wait for mould to become a problem before taking action.

At PRO Cleaning Group, we’re The Professionals who Care! Our experienced team delivers tailored cleaning and hygiene solutions for businesses of all types — helping you maintain safe, welcoming, and compliant premises throughout the year.

Ready to protect your property this winter? Contact PRO Cleaning Group today to discuss a cleaning and maintenance plan suited to your needs.

Call Us on