How to Get Rid of a Musty, Damp Smell in Your Home

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

That stale, damp, slightly earthy smell that hits you when you open the door — the one that never quite goes away no matter how much you air the place out — is one of the most common complaints in Lower Mainland homes. It's not just unpleasant. A musty smell is almost always your nose telling you there's more moisture in your home than there should be, and often that mould or mildew is already growing somewhere you can't see. Masking it with candles and sprays won't fix it. The good news: once you understand what causes the smell, it's usually straightforward to find the source and get rid of it for good.

This guide walks through what causes a musty smell, how to hunt down the source, how to clear it out, and — honestly — when the smell is a sign of a bigger moisture problem that needs a professional rather than a clean.

What causes a musty smell in the first place

A "musty" or "damp" smell is the smell of microbial growth — mould and mildew — feeding on damp surfaces. Those organisms release gases as they grow, and that's what you're smelling, often before you can see a single spot. In coastal Vancouver, where months of rain and mild, humid weather keep the air damp, the usual culprits are:

• Excess indoor humidity. When the air itself holds too much moisture, everything in the room stays slightly damp — walls, fabrics, wood — and that's all mould needs.
• Hidden mould or mildew. Behind furniture pushed against a cold exterior wall, under a sink, inside window tracks, in grout and tub seals, or beneath flooring after a small leak.
• Damp textiles and carpets. Towels left in a heap, a gym bag, laundry that sat wet too long, curtains, upholstery, or a carpet that got soaked and never fully dried. Fabric holds moisture and smell better than almost anything.
• Poor ventilation. Closed-up rooms, closets, and below-grade spaces where air never moves let dampness and odour concentrate.
• Basements, crawlspaces and garden suites. Below-grade and ground-level spaces are cooler and pull moisture from the surrounding soil, which is why so many Lower Mainland basement and garden suites carry that classic damp-basement smell.

If your problem is specifically visible mould rather than just the smell, our how to prevent mould in a Vancouver home guide goes deeper on the whole-home picture.

Step one: find the source (don't just cover it)

Before you buy anything, play detective. The smell is a clue, and it usually gets stronger the closer you get to the source.

• Follow your nose, room by room. Notice where the smell is strongest. Closets, bathrooms, laundry areas, basements and the spaces behind big furniture are prime suspects.
• Check the fabrics. Sniff towels, bath mats, curtains, upholstered furniture, area rugs and wall-to-wall carpet — especially near exterior walls, windows and any spot that's been wet.
• Look in the damp-prone spots. Under sinks, around the base of the toilet and tub, inside window tracks and sills, behind the fridge, and along the bottom of exterior-facing walls and closets.
• Get a hygrometer. A cheap humidity meter (a few dollars) tells you whether the whole room is too damp. HealthLinkBC and Health Canada recommend keeping indoor relative humidity roughly between 30% and 50% to discourage mould and dust mites. Readings sitting above 50% mean the air itself is feeding the problem.
• Check for hidden water. A slow leak under a sink, a past flood, condensation pooling on a windowsill, or a damp basement floor will keep re-supplying moisture no matter how much you clean.

How to actually get rid of the smell

Once you've found the source, the fix is a combination of drying the space out and cleaning the things that hold the smell.

1. Ventilate aggressively. Open windows on drier days for a cross-breeze, run bathroom and kitchen exhaust fans, and keep interior and closet doors open so air can circulate instead of stagnating. If you have a heat-recovery ventilator (HRV), run it — many newer Lower Mainland condos have one.

2. Dehumidify to 30–50% RH. In our wet season, ventilation alone often isn't enough. A dehumidifier — especially in a basement, garden suite or any room that reads high on the hygrometer — is the single most effective tool for a persistent damp smell. Aim for the lower end of that 30–50% range through the rainy months.

3. Wash and fully dry every damp textile. Launder towels, bath mats, bedding, curtains and any washable fabric that smells musty, then dry them completely — ideally in a dryer vented outdoors, or in a well-ventilated spot. A textile that goes back into a closet even slightly damp will smell again within days. For carpets and upholstery that got wet, they must be dried thoroughly and quickly; anything that stayed soaked for more than a day or two may be holding mould in the backing.

4. Clean and dry the damp-prone surfaces. Wipe down window tracks and sills, tub and shower seals, under-sink cabinets, and the corners of damp closets with soap and water, then dry them. Removing the grime and moisture removes what the mould is feeding on. One safety rule that never bends: never mix bleach with ammonia or with acids like vinegar — the combination releases toxic gas. Use one product at a time and ventilate the room.

5. Address any visible mould. Health authorities say a small patch of surface mould — roughly under one square metre — can usually be cleaned by a homeowner: gloves on, room ventilated, wipe with soap and water, dry thoroughly, and fix the moisture that caused it. If cleaning it removes the smell, you've found your source.

A deep, top-to-bottom clean is often what finally clears a lingering musty smell, because it reaches all the surfaces at once — window tracks, grout, seals, behind and under appliances, and the corners where dust and damp collect. If you'd rather have that reset done for you, a one-time deep cleaning covers exactly those spots.

When a musty smell means a bigger problem

Sometimes the smell won't go away no matter how much you clean and dry — and that's important information. A musty smell that you can't locate, that keeps coming back after cleaning, or that's strongest near walls, floors or ceilings usually points to moisture or mould inside the building itself: behind drywall, under flooring, in a crawlspace, or from a leak in the envelope or plumbing. Those are moisture and building problems, not cleaning problems.

Bring in a professional remediation or restoration company when the affected area is larger than about one square metre, when mould keeps returning, when it's hidden inside walls or a crawlspace, or when a strong musty smell has no visible source you can find. Persistent window condensation is often part of the same picture, and getting it under control is a big part of the fix.

Here's where we're straight with you about our role: MaidEX is a cleaning service, not a mould-remediation company. A thorough clean genuinely helps — it removes damp grime, cleans the textiles and surfaces holding the smell, and gives you a fresh baseline — but we don't remediate active mould or fix the building issues behind it. For that, hire a qualified remediation specialist.

What we can do is give your home a deep reset and keep it consistently clean so damp and grime don't build back up. 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

What causes a musty smell in a house? A musty smell is the smell of mould and mildew feeding on damp surfaces — so it almost always means there's too much moisture somewhere. In Vancouver homes the common sources are high indoor humidity, hidden mould behind furniture or under sinks, damp textiles and carpets, poor ventilation, and cool below-grade spaces like basements and garden suites.

How do I find where a musty smell is coming from? Follow your nose room by room — the smell gets stronger near the source. Check fabrics (towels, curtains, upholstery, carpet), damp-prone spots (under sinks, window tracks, tub seals, behind the fridge), and use a cheap hygrometer to see which rooms read above 50% humidity. Also look for hidden water from leaks, past flooding or condensation.

What indoor humidity level should I aim for? HealthLinkBC and Health Canada recommend keeping indoor relative humidity roughly between 30% and 50% to discourage mould and dust mites. In Vancouver's wet season, aim for the lower end of that range. A hygrometer costs only a few dollars and tells you whether the air itself is the problem.

Will an air freshener or candle get rid of a damp smell? No — those only mask it. A musty smell is caused by ongoing microbial growth in a damp spot, so it will keep coming back until you find the source, dry it out, and clean or remove what's holding the moisture and smell.

When should I call a professional instead of cleaning it myself? If the smell won't go away after cleaning and drying, keeps coming back, has no source you can find, or is strongest near walls, floors or ceilings, it likely points to moisture or mould inside the building. Areas larger than about one square metre, recurring mould, or anything hidden in walls or a crawlspace should be handled by a professional remediation company — that's a building problem, not a cleaning one.

Sources

• HealthLinkBC — Mould in Your Home
• Health Canada — Mould in homes
• BC Centre for Disease Control — Mould

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.