Dealing with Damp & Condensation 

What is dampness and condensation, and what causes them?

Dampness occurs when too much moisture becomes trapped inside a home. Over time this can cause musty smells, mould growth and visible signs of moisture on walls, ceilings and furniture.

Condensation happens when warm, moist air cools down and can no longer hold the same amount of water vapour. When this air comes into contact with cold surfaces, such as windows, the moisture turns into water droplets and collects on those surfaces.

Everyday activities like cooking, bathing, drying laundry and even breathing naturally create moisture indoors. While this is normal, it must be balanced by effective insulation, ventilation and heating. 

Why do damp and condensation matter for the whole country?

Cold, damp homes are linked to a variety of health problems and can make it harder for people to recover from common illnesses. These conditions are especially tough on children, older people and anyone with respiratory issues. The social and economic impacts flow through communities, affecting overall well being and placing additional pressure on the health system.

Surveys of New Zealand housing have repeatedly shown that dampness and mould are common issues in both rental and owner-occupied homes, particularly in areas such as bathrooms and bedrooms. Poor insulation and limited ventilation make homes more difficult and costly to heat, which can lead some households to reduce their heating use and face the associated health risks.

What can tenants do to reduce condensation?

Tenants play an important role in managing moisture day-to-day. Helpful steps include:

• Drying laundry outside or in a well-ventilated area whenever possible

• Using ventilation systems or opening windows to allow fresh air to circulate

• Using extractor fans in kitchens and bathrooms

• Keeping pot lids on when cooking

• Wiping condensation from windows

• Using dehumidifiers if necessary

• Heating the home consistently to maintain healthy indoor temperatures

For more guidance, tenants can visit energy efficiency resources or seek advice from their property manager on ways to keep their home warm and dry.