Dampness, Mould and Ventilation in Your Rental

A little moisture on a window can be easy to dismiss. A recurring musty smell, damp patch or mould returning in the same place is worth recording and raising early. This guide is for renters in Marshland and north Christchurch who want practical steps for keeping their home aired and knowing what information helps a property manager investigate.

Notice the pattern, not just the patch

Condensation can collect on cold surfaces, while dampness can also be associated with a leak, drainage problem or another building issue. A photo alone cannot identify the cause. A short record can help your property manager understand what is happening and whether a further check is needed.

• Note the date, room and exact place you see moisture or mould.
• Take a clear, dated photo, and another later if it returns.
• Record whether it follows rain, cooking, showering, clothes drying or a cold morning.
• Describe any musty smell, peeling finish, water stain or change in size.
• Include what ventilation or cleaning steps you have already tried.

In Christchurch, a simple morning check through colder months can help you spot whether moisture clears after airing the room or keeps returning in one location. Keep the notes factual rather than trying to diagnose the cause.

Everyday habits that help manage moisture

Tenancy Services recommends airing rooms, using extractor fans where provided, wiping condensation, drying clothes outside where possible and leaving space for air to move around furniture. Use lids while cooking, close the bathroom door while showering, and run the extractor fan during and after bathing if the home has one. Keep vents and fan grilles clear, and let your manager know if a fan does not work.

Open windows or doors when practical and safe, especially after cooking or showering. If you use a clothes dryer, vent it outside as designed. Avoid unflued portable gas heaters; they add moisture to the air. Follow the heater instructions and the terms of your tenancy.

When and how to report it

Tell the property manager named in your tenancy agreement promptly if there is water coming in, a leak, a persistent damp smell, mould that returns after cleaning, or a patch that is growing or affecting a surface. Use the repair contact method provided for your tenancy. Include the property address, room, when you first noticed it, what has changed, and your dated photos.

Keep a copy of your message and any reply. If you are unsure how to report a repair, see our Repairs and Maintenance guide. The general enquiry form below is not an urgent repair channel. For immediate danger to life or safety, call 111.

Small surface patches and cleaning

For a small surface patch, follow the current cleaning and protective-equipment guidance from Tenancy Services: mould and dampness and the instructions on any cleaning product. Never mix cleaning products. If the affected area is extensive, keeps returning, or is in a place you cannot safely reach, report it and ask for advice rather than guessing at the cause.

What renters and landlords are responsible for

Renters should keep the home reasonably aired, remove small amounts of mould promptly and report maintenance problems. Landlords must meet the applicable rental-housing requirements, including the Healthy Homes Standards, and address issues that are their responsibility. The right response depends on what is causing the moisture and the facts of the property.

Read the current Healthy Homes Standards information and Tenancy Services guidance on mould and dampness. These official resources explain responsibilities and practical steps in more detail.

Talk to Ray White Marshland

If you rent a property managed by our office and want help with a non-urgent moisture or maintenance question, use the contact form below. Please include the property address and a short description. Do not send identity documents or sensitive financial information through a general enquiry. Existing tenants should continue to use the repair process set out in their tenancy agreement.