How to Stop Window Condensation in a Vancouver Condo

Written by MaidEX Cleaning Services Editorial Team · Reviewed by Milad Hoseini, Founder & CEO · Published October 13, 2026 · 7 min read

If you wake up in a Vancouver condo on a cool morning to windows fogged with water — beads running down the glass, a wet line pooling on the sill — you're not alone, and it's not a sign your windows are broken. It's the local climate meeting the way modern condos are built. The good news is that window condensation is almost always a humidity problem you can control, not a repair you have to pay for. Here's why it happens, why our condos are especially prone to it, and what actually works to keep the glass dry and the sills mould-free.

Why condensation forms on your windows

Condensation is simple physics. Warm air holds more moisture than cold air. When the warm, humid air inside your condo touches a cold surface — like a window pane chilled by the rain and cold outside — the air right against the glass cools down and can no longer hold all its moisture. That moisture drops out as liquid water on the glass. It's the same reason a cold drink "sweats" on a warm day.

So condensation isn't water leaking in from outside. It's moisture that was already in your indoor air, condensing on the coldest surface in the room — which is almost always your windows in winter, followed by exterior walls, closets against outside walls, and window frames.

Why Vancouver condos are especially prone to it

Several things stack up against you here at once:

• Our wet, cool climate. Months of rain and mild-but-damp weather keep the outdoor air moist and the glass cold. That's the exact recipe for condensation.
• Tight, modern building envelopes. Newer condos are built to be airtight and energy-efficient — great for your heating bill, but it means the moisture you generate indoors has nowhere to escape unless you deliberately ventilate. Older, draughtier buildings "leaked" that humidity out; sealed suites hold onto it.
• Small spaces, big moisture sources. A condo is a compact volume of air, so everyday activities spike the humidity fast. Cooking and boiling water, hot showers, and — the big one — drying laundry indoors on a rack can each dump litres of water into the air of a small suite.
• Fewer places for damp air to go. In a house you can open a basement window or cross-ventilate through many rooms. In a one- or two-bedroom condo, that moist air just circulates until it lands on the cold glass.

Because of all this, foggy windows in a Vancouver condo are usually telling you one thing: the whole suite is holding too much moisture.

The one number that matters: indoor humidity

If you take away just one thing, make it this: keep your indoor relative humidity roughly between 30% and 50%. That's the range recommended by HealthLinkBC and Health Canada to discourage condensation, mould and dust mites. In our wet season you may need to aim for the lower end.

A cheap hygrometer (humidity meter) — a few dollars at any hardware store — is the single most useful tool you can buy. If it reads above 50% and your windows are dripping, that's your signal to ventilate more and cut your moisture sources. Lower the humidity and the condensation goes away on its own.

Practical fixes that actually work

Run your bathroom and kitchen fans — and leave them on. Run the bathroom exhaust fan during every shower and for a good while after, until the mirror clears. Use the kitchen range hood every single time you cook or boil water. These fans exist specifically to pull the wettest air straight out of your suite before it spreads.

Use your HRV if you have one. Many newer Lower Mainland condos have a heat-recovery ventilator (HRV) that swaps stale, damp indoor air for fresh outdoor air without losing much heat. Run it — don't switch it off to save power. If you're not sure whether you have one or how it works, check your suite manual or ask your strata or building manager.

Open the blinds and get air moving. Closed blinds and curtains trap a pocket of still, cold air against the glass, which makes condensation worse. Open them during the day, and keep interior doors open so air circulates instead of stagnating. On a drier day, a short cross-breeze from opening a couple of windows flushes out humidity fast.

Cut your indoor moisture sources. This is where condos win or lose. Dry laundry outdoors, in a dryer vented outside, or at a laundromat rather than on an indoor rack. Cover pots when boiling. Keep the bathroom door closed and the fan running during showers. If you have a lot of houseplants clustered together, they add moisture too.

Run a dehumidifier in the wet season. If ventilation alone isn't enough, a small dehumidifier is the most reliable way to hold a condo at a healthy humidity level through the rainy months.

Wipe the glass and sills. Until you've got the humidity down, physically wipe up the water each morning rather than letting it pool. A wet sill and frame left day after day is exactly where mould and rot start.

The mould connection

Condensation matters because it's the number-one early warning of a mould problem in Vancouver condos. That standing water on cold glass, frames, and the wall around the window feeds mould — and mould loves the exact conditions a damp, sealed suite provides. If you're already seeing black spotting around your window frames, in the bathroom, or a musty smell you can't place, tackle the moisture first, then the mould.

We go deep on this in two related guides: how to prevent mould in a Vancouver home covers the whole suite room by room, and bathroom mould in a Vancouver apartment tackles the single wettest room. If your condo also fights constant dust, that's often a related air-and-ventilation issue — see why is my condo so dusty.

One safety rule that never bends when you're cleaning damp spots or small mould patches: never mix bleach with ammonia or with acids like vinegar — the combination releases toxic gas. Use one product at a time and ventilate well.

Where MaidEX fits — honestly

Here's the honest part: MaidEX is a cleaning service, not a window, envelope, or mould-remediation company. We don't fix leaking windows, replace failed seals, or repair building moisture problems, and we don't remediate active mould inside walls — those are jobs for a glazier, your strata's contractor, or a qualified remediation specialist.

What we do help with is the maintenance side that keeps condensation from turning into a bigger problem: consistent cleaning of window tracks, sills, frames, and the damp-prone spots around bathrooms and kitchens, so mould has less to feed on and small spots get caught early. A one-time deep clean is a good reset, and a recurring plan keeps those high-risk areas in check through the wet season.

MaidEX is fully insured and background-checked, and works throughout Metro Vancouver and the Lower Mainland. You can get an upfront quote in a couple of minutes at book your clean — pricing includes 5% GST, with recurring plans discounted (up to 15%, applied from your second clean).

Frequently asked questions

Why do my Vancouver condo windows get so much condensation in winter? Warm, humid indoor air condenses when it hits the cold glass. Vancouver's wet, cool climate keeps windows cold and the air damp, and modern airtight condos trap the moisture you generate from cooking, showers and indoor laundry. The condensation is a sign your suite's humidity is too high — not that the windows are leaking.

What indoor humidity level stops window condensation? Aim to keep indoor relative humidity roughly between 30% and 50%, as recommended by HealthLinkBC and Health Canada. In our wet season, targeting the lower end is safest. A cheap hygrometer lets you check — if it reads above 50% and your windows are dripping, ventilate more and reduce moisture sources.

Does drying laundry indoors cause window condensation? Yes, it's one of the biggest causes in a small suite. A rack of wet clothes can release litres of water into the air of a closed condo. Dry laundry in a vented dryer, outdoors, or at a laundromat, and run your fans when you can't avoid indoor drying.

Is condensation on windows dangerous? The water itself isn't, but leaving it to pool on sills and frames day after day leads to mould and wood rot, and persistent heavy condensation means the whole suite is too humid. Wipe it up, lower your indoor humidity, and it stops on its own.

Can MaidEX fix my condensation or foggy windows? No — MaidEX is a cleaning service, not a window or building-repair company, and we don't remediate active mould. We can keep your window tracks, sills and damp-prone areas consistently clean so mould has less to feed on and problems get caught early. Repairs to windows, seals or the building envelope are jobs for a glazier or your strata's contractor.

Sources

• HealthLinkBC — Indoor Air Quality and Mould
• Health Canada — Mould in homes

About the author

Milad Hoseini

Founder & CEO, MaidEX Cleaning Services

Written by the MaidEX Cleaning Services Editorial Team and reviewed by Milad Hoseini, who founded MaidEX in Vancouver. MaidEX provides insured, background-checked cleaning across Metro Vancouver and the Lower Mainland. More about MaidEX →

How this guide was made

This guide draws on MaidEX's hands-on cleaning experience across Metro Vancouver and the Lower Mainland, along with publicly available sources. It was drafted with the help of AI tools, then reviewed and fact-checked by our editorial team and approved by Milad Hoseini, Founder & CEO, before publishing.