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Why Is My Townhome So Musty?

Last updated October 25, 2026

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The short answer

Look for Hidden Moisture

A musty odor almost always points to moisture that has soaked into a material like drywall, carpet, or wood. In a townhome, the problem often hides in places you cannot see: behind baseboards, under vinyl flooring, inside wall cavities, or beneath the slab. A slow leak from a supply line or a poorly sealed window can keep materials damp for weeks before you notice the smell.

Start by sniffing around the room and checking obvious spots like the bathroom, kitchen, and utility closet. Feel walls for cool or damp patches, and look for discoloration, bubbling paint, or warped flooring. If you cannot find the source yourself, a professional leak detection service can trace the moisture without tearing open your walls.

  • Check under sinks and around toilets for dampness
  • Look for water stains on ceilings and walls
  • Feel floors near exterior walls for coolness
  • Inspect window frames and door thresholds for gaps
  • Use your nose to track the strongest odor

Mold and Mildew Growth

Where there is persistent dampness, mold and mildew will follow. Mildew is a surface mold that often appears as dark spots on grout, caulk, or painted walls, and it produces a distinct musty smell. More serious mold can grow inside wall cavities, on the back of drywall, or under flooring, and it can spread without you seeing it.

If you see visible mold, you can clean small areas with a mild detergent and water, but porous materials like drywall or carpet may need to be removed. For larger growth or if you have health concerns like asthma or allergies, consider consulting a mold professional. They can assess the extent and recommend safe removal methods.

  • Visible mold on surfaces needs cleaning
  • Porous materials may require removal
  • Hidden mold often smells stronger than visible patches
  • Keep humidity below 50 percent to slow growth
  • Ventilate bathrooms and kitchens while cooking or showering

Check Your Ventilation

Townhomes often have less natural airflow than detached houses because they share walls and have fewer windows. Without good cross-ventilation, moisture from cooking, showering, and even breathing stays in the air and settles into fabrics and walls. That lingering dampness can create a musty smell even without a major leak.

Run exhaust fans in bathrooms and kitchens, and open windows when the weather allows. If your townhome feels stuffy, a dehumidifier can pull excess moisture from the air, especially in basements or during humid months. The goal is to keep indoor humidity levels comfortable and consistent.

Look for Leaks from Pipes or Roof

A musty smell in a townhome could come from a leak in a pipe behind a wall or under the slab. The water may not be visible if it is absorbed by insulation or drywall. Similarly, a roof leak or a problem with the flashing around a chimney or skylight can let water in slowly, soaking attic insulation and ceiling drywall.

Inspect your attic for damp insulation or water stains on the underside of the roof sheathing. Check the ceiling below bathrooms and the area around your water heater. If you suspect a pipe leak, turn off the water supply to that fixture and call a plumber for a pressure test or leak detection. Acting quickly can prevent further damage.

  • Inspect attic insulation for damp spots
  • Check ceilings below bathrooms for stains
  • Look at the water heater for rust or puddles
  • Test shutoff valves to know where they are
  • Listen for hissing sounds near walls

Dry Out the Affected Area

Once you find the source of the moisture, you need to dry the area thoroughly. Simply wiping up visible water is not enough if materials like drywall, wood, or carpet have soaked up moisture. Those materials can stay damp for days, which keeps the musty smell alive and allows mold to grow.

Use fans, dehumidifiers, and open windows to speed up drying. Remove wet carpet padding or soaked drywall if they cannot be dried quickly. For large areas or hidden moisture, professional structural drying and dehumidification can bring the materials back to a safe moisture level. The cost depends on the size of the affected area and how much material needs to be dried or removed.

Water damage does not wait

Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.

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Frequently asked questions

Can I get rid of the musty smell just by using air fresheners?

Air fresheners only mask the smell temporarily. They do not remove the source of the moisture or mold. To truly get rid of the musty odor, you need to find and fix the dampness, dry the materials, and clean or remove any mold growth.

How long does it take for mold to grow after a leak?

Mold can start growing within 24 to 48 hours after materials become wet. That is why it is important to dry out the affected area quickly. If you dry the area within a couple of days, you can often prevent mold from taking hold.

Should I worry about the musty smell if I cannot see any water?

Yes, because the smell usually means there is hidden moisture. It could be from a slow leak, condensation, or high humidity. The pros can use moisture meters and leak detection to find the source without tearing open walls, so you can address the problem properly.

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