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Birds nesting in your dryer vent: what the law allows and how to keep them out
Every spring, the dryer vent hood on the side of a Kitchener house looks like a perfect nest box to a starling. The result is a vent packed with grass and twigs, and a question about what you are allowed to do about it.
Last updated September 25, 2026 · Reviewed by the Kitchener Dryer Vent Cleaning team
Why birds pick dryer vents
A dryer hood is a sheltered cavity a few feet off the ground, facing out, often warm. The damper flap on a louvered or single-flap hood is easy for a bird to push open, and once inside, the duct is exactly the right diameter for a nest. In Kitchener the pattern peaks in April and May, and the birds most often involved are European starlings, which nest in cavities.
Nest material is a problem well beyond the hood. Grass, twigs and feathers are pushed back along the duct, where they trap lint, block airflow and sit in a hot airstream. A dryer that suddenly needs two cycles in May, with no other change, often has a nest in the vent.
What federal bird law says
Many birds in Canada are protected under the Migratory Birds Convention Act, 1994 and the Migratory Birds Regulations, 2022. The regulations say that, without a permit, a person must not damage, destroy, remove or disturb the nest of a migratory bird. They also set out when a nest can be removed without a permit: for most species, a nest can be removed if it does not contain a live bird or a viable egg. A short list of species in Schedule 1 of the regulations have nests that stay protected even when empty, for a set period, unless notice has been given to the Minister.
Not every bird is covered. The Government of Canada explains that the Act covers most songbirds, including robins, swallows and chickadees, but not every family. Starlings are one of the families not included, along with others such as crows and jays. That does not make a nest a free-for-all: provincial wildlife law can apply to some species, and a nest with young in it is a humane problem as much as a legal one.
The practical rule: identify, then time it
- Find out what bird it is. Watch the hood from inside a window for a few minutes. Starlings are stocky, dark and glossy, with a short tail and, in spring, a yellow beak. If you are not sure, a photo helps.
- Listen for young. Chirping from inside the vent means there are nestlings. For a protected species, the nest stays until the young have left.
- Stop using the dryer if the vent is blocked. Running a dryer into a packed vent sends heat and lint back toward the machine. Hang laundry or use a laundromat for a few weeks rather than risk it.
- Once the nest is empty, clear the whole run, not just the hood. Nest material travels back along the duct, and the full length has to be cleaned before the dryer goes back into service.
- Guard the hood right after the nest comes out, or the birds will be back.
Guarding the hood the right way
This is where a lot of well-meant fixes go wrong. A fine mesh screen over a dryer hood stops birds and also stops lint, which builds up on the screen and blocks the vent. GE Appliances states that screens cannot be installed in dryer exhaust ducts. What works instead:
- A cage-style vent guard with openings large enough for lint to pass, fitted over the hood and designed to open for cleaning.
- A hood with a single, well-weighted damper that closes fully when the dryer is off, replacing a broken or missing flap.
- A hood at a sensible height. Hoods tucked behind a deck, under shrubs or in a window well are both harder to guard and more attractive to birds and rodents.
Check the guard every few months for lint, and after snowstorms, since the same guard can hold snow and ice. The province advises keeping outside vents for the dryer and fuel-burning appliances clear of snow and debris.
Signs there is a nest in the vent
- Twigs, grass or feathers sticking out of the hood, or birds flying in and out.
- Chirping or scratching from the wall near the laundry area.
- A dryer that suddenly takes much longer to dry a load in spring.
- A hood damper that no longer opens when the dryer runs.
- Bird droppings on the siding or ground directly under the hood.
Other vents on the same wall
Starlings and sparrows use bathroom and kitchen exhaust hoods too, and the fix is similar. If your house has a heat recovery ventilator, its hoods are a different kind of vent and are designed to keep their screens, which Natural Resources Canada says should have openings no smaller than a quarter inch.
Where this happens most
Low side-wall hoods on bungalows and sidesplits in Stanley Park and Forest Heights, rear hoods on townhouses in Doon, and hoods on older houses in Breslau near open fields all see nesting every spring.
Bird guard and vent cover installation is usually done at the same visit as the nest removal and a full-run clean. For planning ranges on nest removal, hood replacement and guards, see the Kitchener dryer vent cleaning cost guide. To book, use the contact page.