The Landlords Winter Maintenance Guide
Christchurch winters aren't extreme. But they're long, damp, and genuinely unforgiving on rentals that haven't been looked after. The cold months have a way of surfacing every deferred maintenance job, and turning small oversights into expensive callouts at inconvenient times.
The good news: the majority of winter issues are preventable. Most of the callouts we see could have been avoided with some basic attention in autumn. The ones that can't be prevented are largely about how fast you respond, and that's where having a property manager in your corner really counts.
The five winter callouts that cost the most
These are the issues we're called about most often once the temperature drops, and the ones that tend to land landlords with the biggest bills.
Blocked or overflowing gutters - autumn leaves sit in gutters over winter. Rain hits, water has nowhere to go, and it starts tracking into the soffit or behind the cladding. A $150 gutter clean avoids what can easily become a $2,000+ repair.
Hot water cylinder failures - cold temperatures put extra load on hot water systems, especially older cylinders. A tenant without hot water in July is a Healthy Homes compliance issue, a tenant welfare concern, and an emergency callout fee all at once. If your cylinder is approaching 10–15 years old, get it assessed now.
Burst pipes and ground frost - Canterbury frosts hit harder than people expect. Exposed or poorly insulated pipes in older homes can burst overnight. Know where your mains shut-off is and make sure your tenant does too.
Heat pump and heating failures - the phone rings in winter when the heat pump stops working. Most of these callouts trace back to filters that haven't been cleaned in years. More on this below.
Moisture and mould damage - condensation builds up in winter, and without adequate ventilation it becomes mould. Left unchecked, it spreads into walls, ceilings, and built-in wardrobes, which moves it from a maintenance issue to a health issue and a tenancy dispute risk.
Heat pump care - why a $0 job prevents a $200 callout
Under the Healthy Homes Standards, landlords must provide adequate heating in the main living area, and most Christchurch rentals now rely on a heat pump to meet that requirement. So when the heat pump goes down in winter, it's not just uncomfortable for your tenant it’s also a compliance issue.
The most common reason we see heat pumps fail in winter? Dirty filters.
When filters are clogged, the unit works harder, draws more power, and eventually trips or shuts down. A technician callout to diagnose and clean a blocked unit will cost $150-$250.
Before winter, make sure:
Filters have been removed and cleaned (most slide out and rinse under a tap)
The outdoor unit is clear of debris, leaves, and overgrown vegetation
The unit is running correctly on both heating and cooling modes before the cold weather sets in
Your tenant knows how to operate the heat pump and what temperature settings are appropriate
If your heat pump is more than 10 years old, factor in a professional service, not because anything is necessarily wrong, but because catching issues early is considerably cheaper than resolving them if something goes wrong.
Moisture management - what tenants can't (or won't) do alone
Moisture is the defining winter problem in Christchurch rentals. Cooking, showering, drying clothes inside, and simply breathing all add moisture to the air. In a well-ventilated home, it disperses. In a cold, poorly ventilated rental, it lands on windows, walls, and ceilings and eventually becomes mould.
Tenants can help, opening windows when cooking or showering, using extractor fans, wiping down condensation on windows, but they can't fix structural causes. That's the landlord's responsibility under the Healthy Homes Standards, and it starts with getting the basics right.
Things to check before winter:
Extractor fans: Are they actually working and venting to outside (not into the ceiling cavity)?
Subfloor ventilation: In older Christchurch homes, inadequate subfloor airflow is a major driver of dampness. Clear subfloor vents and check that ground vapour barriers are intact.
Ceiling and wall insulation: Inadequate insulation is both a Healthy Homes compliance issue and a direct driver of condensation on cold surfaces.
Existing mould: If mould is already present in the bathroom, laundry, or on window sills, address it now. Cold and damp conditions will accelerate it.
A simple checklist sent to tenants covering ventilation habits, condensation management, and who to contact if they spot mould early, can catch problems before they escalate.
Check-in or physical inspection? Knowing when to do which
A written check-in is a useful tool. A physical inspection is a different one. Both serve a purpose in winter, but they're not interchangeable.
When a check-in message is appropriate:
At the start of the season: to prompt tenants to report any heating or moisture issues early
After a notable weather event (frost, heavy rain, high winds): to confirm everything is fine inside
Ongoing: to maintain communication and give tenants a low-friction way to flag issues before they escalate
When a physical inspection is needed:
You haven't been inside in 3+ months - at a minimum, a routine inspection should pick up what a message won't
A tenant has flagged a moisture or mould concern - always follow up in person rather than asking for photos
There's been storm damage or a maintenance event (burst pipe, ceiling leak, etc.)
You have any reason to believe the property is being used in a way that might cause damage
Under the Residential Tenancies Act, landlords (and property managers acting on their behalf) must provide 48 hours' written notice for routine inspections. Inspections can't take place more than once every four weeks. Plan ahead so you're not caught out if something needs following up mid-winter.
Insurance gotchas to know before something goes wrong at 11pm
Landlord insurance is there for when things go seriously wrong, but it doesn't cover everything, and winter has a way of exposing the gaps. A few things worth understanding before you need to make a claim:
Gradual damage is often excluded. If a roof has been leaking slowly for months and finally causes ceiling damage, many policies will decline the claim on the basis that the issue wasn't addressed when it was first identified. Regular inspections and documented maintenance records protect you here.
Vacant properties attract different conditions. If your rental is vacant during winter - between tenancies or being renovated - check whether your policy requires periodic inspection visits. Some policies void water damage claims if a property has been unoccupied and uninspected for more than a set period.
Mould is a contested area. Whether mould damage is covered depends on the cause and your specific policy. Sudden mould from a burst pipe is typically treated differently from mould that developed due to poor ventilation over time. Know your policy before you assume it's covered.
24/7 emergency lines aren't always what they seem. Some insurers offer emergency assistance, but only for defined events. A heat pump that stops working at 10pm on a Sunday isn't typically an insurance matter, it's a maintenance call. Know who handles what so you (and your tenant) aren't left chasing the wrong number.
