Mould is one of the most common issues in Spanish coastal properties, especially in homes that remain closed for long periods of time. High humidity, limited ventilation and the coastal climate create ideal conditions for moisture buildup, which can quickly lead to mould if not managed properly.

This is particularly relevant for international property owners who do not live in Spain year-round and may not notice early warning signs. The good news is that most mould problems can be prevented with regular checks and simple maintenance habits.

Why mould is common in coastal homes

Coastal areas such as Alicante, Murcia and Costa Cálida experience higher humidity levels throughout the year. When properties are closed, moisture becomes trapped indoors, especially in bathrooms, wardrobes and corners with limited airflow. Over time, this creates condensation and damp surfaces where mould can develop.

Simple steps to prevent mould and moisture buildup

Air the property regularly
Fresh air is one of the most effective ways to control indoor humidity. Even opening windows for 10–15 minutes a few times per week helps remove trapped moisture and refresh the air inside the home.

Create cross-ventilation when possible
Keeping doors and windows slightly open on opposite sides of the property allows air to circulate and prevents condensation on walls, ceilings and furniture.

Use a dehumidifier during humid months
A small dehumidifier running for a few hours a day can significantly reduce moisture levels and prevent mould before it starts, especially in bedrooms and living areas.

Check wardrobes and cold corners regularly
Mould often appears first in closed wardrobes, behind furniture and in shaded corners. Leave wardrobe doors slightly open when the property is vacant and avoid pushing furniture tightly against walls.

Avoid drying clothes indoors
Drying laundry inside adds a large amount of moisture to the air. If indoor drying is unavoidable, ensure good ventilation or use a dehumidifier at the same time.

Inspect bathrooms and silicone seals
Bathrooms are high-risk areas. Replace damaged silicone, clean extractor fans and allow proper airflow after showers to prevent moisture buildup.

Leave the property clean and dry before closing it
Dust and dirt can trap moisture. A thorough clean and proper airing before leaving the property closed for an extended period helps reduce the risk of mould developing while you are away.

What to do if mould has already appeared

If mould is visible, it should be addressed quickly. Small areas can often be treated with proper cleaning and ventilation, but recurring or widespread mould may indicate deeper moisture issues that require professional attention.

A final note for property owners

A little prevention goes a long way, especially in coastal homes. Regular checks and simple habits can protect your property, improve indoor air quality and prevent long-term damage.

If you are not able to visit your property regularly or would like a professional assessment, our team helps international owners manage moisture issues through cleaning, preventative maintenance and property care services across Alicante, Murcia and Costa Cálida.