Bundoran’s status as a popular seaside destination brings thousands of visitors every year—but if you own or manage a holiday property in the area, there’s one guest you didn’t invite: recurring mould.
Despite regular cleaning and seasonal maintenance, many owners report mould returning again and again—especially in colder months or during long periods when the property is unoccupied. But why does this happen, and more importantly, how can you stop it?
Let’s break it down.
Mould thrives in cold, damp, and poorly ventilated environments. In holiday homes, heating is usually turned off for long stretches, especially during the off-season. With no heating and minimal airflow, condensation builds up fast—and that’s mould’s ideal breeding ground.
According to UK Centre for Sustainable Energy, when indoor air isn't properly ventilated and heated, it condenses on cold surfaces, leading to the damp conditions that mould needs to grow.
If you only visit or rent your property during certain months, that start-stop heating cycle combined with limited airflow can cause mould to creep in—especially on ceilings, behind wardrobes, or on external walls.
Being near the sea has its perks, but it also means constantly high moisture levels in the air. Salt-laden air holds moisture more readily and can break down certain building materials, including older renders and sealants. Over time, this creates micro-gaps for damp to enter.
Humidity over 60% creates the perfect environment for mould. Bundoran's average relative humidity rarely dips below this threshold, particularly in autumn and winter.
The Met Éireann climate data confirms that coastal towns like Bundoran experience higher average humidity year-round compared to inland locations.
Many Bundoran holiday homes, especially older cottages or bungalows near the coast, rely on dated or degraded damp-proofing. Over time, this can allow rising damp to creep into walls and floors, especially after wet winters.
If your property shows signs of musty odours, black marks near floorboards, or bubbling paint, these could all point to damp ingress behind the scenes—well before mould shows itself.
Learn more about how rising damp causes mould here.
Bleach, paint, and “anti-mould sprays” are only temporary solutions. Without addressing the root causes—like excess moisture, poor ventilation, and hidden contamination—the mould will return. Fast.
At Causeway Cleaning Ltd, we see this constantly. Homes that look clean on the surface often have invisible spore contamination in air ducts, soft furnishings, under floorboards, or behind wall cavities.
🎥 Watch a real-life example of mould hidden beneath a surface
First things first—get a proper assessment. Our detailed inspections include air and surface sampling, humidity mapping, and moisture meter readings. We use mould DNA testing to find hidden contamination that visual checks alone might miss.
A one-off inspection now can save you thousands later in redecoration, lost rental income, or worse—health claims from guests.
Whether the property is occupied or not, maintaining safe humidity levels (ideally between 40%–60%) is key.
The NHS recommends keeping humidity low to prevent mould-related respiratory issues, particularly in children and the elderly.
If your holiday home is empty during off-season months, consider low-energy background heating that keeps internal temperatures above 16°C without breaking the bank.
Oil-filled radiators with thermostats, underfloor heating, or wall-mounted infrared panels are increasingly popular in holiday homes. These reduce condensation build-up on cold surfaces like external walls and windows.
Check for cracks in render, broken seals on windows, and areas where roofing might allow water ingress. These small gaps are the start of bigger problems if left unattended through the winter.
Damp-proofing alone isn’t always enough—proper building envelope maintenance is essential in a harsh coastal environment like Bundoran.
We specialise in treating and preventing mould in coastal, seasonal, and rental properties throughout the northwest of Ireland. Our team is trained in internationally recognised mould remediation techniques—and we don't stop at surface cleaning.
Whether your holiday home needs:
—we’re ready to help.
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📱 UK WhatsApp: +44 7789 635887
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If you're tired of painting over the same spots or refunding unhappy guests, it’s time for a smarter solution. Preventing mould in holiday homes starts with understanding the science behind it—and applying expert, long-term fixes.
Reach out to Causeway Cleaning Ltd today and take control of your property’s health before mould takes control of it.
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