Birds nesting in your dryer vent

Why it is almost always birds when it happens fast

Lint and birds both block dryer vents, but they do it on completely different timelines, and that timeline is how you tell them apart. Lint accumulates slowly, over months and years, so a lint problem creeps up on you. A nest arrives fast. A bird can build enough material to choke a vent in a week or two, which is why the giveaway is a sudden, sharp drop in drying performance rather than a gradual decline.

Birds nest in dryer terminations for a simple reason: the hood is warm, sheltered, and the right size. To a small bird looking for somewhere safe to raise a brood, an unguarded dryer vent is close to perfect. In the Valley, where nesting season is busy and a lot of homes vent through the roof or a wall cap without a guard, it is one of the most common vent problems we see.

The signs

• A fast, dramatic drop in drying. Clothes that dried in one cycle last month now take two or three, and the change happened quickly, not gradually.
• Chirping near the vent. Especially in spring. If you can hear it, there is a good chance there are chicks.
• Nesting material at the hood. Twigs, grass, or debris visible at or poking out of the termination.
• A flap propped open. If the vent flap no longer closes, something is holding it — often the edge of a nest.

Why we never clear an active nest

This is a firm line for us, and it is worth explaining. Before we touch anything, we check whether the nest is active. If there are eggs or live chicks, we stop, leave it undisturbed, and reschedule with you once it is empty.

That is not only decency, it is the law. Active nests of native birds are protected under the federal Migratory Bird Treaty Act, which prohibits disturbing protected species without authorization. Any company willing to tear out an active nest to finish a job faster is one to be wary of, for what that willingness says about the rest of their work.

Once the nest is inactive, removal is straightforward: we take out the nesting material, clear the packed lint that always sits behind it, run an airflow test, and fit a guard.

The guard, and why a screen makes it worse

Removing a nest without changing anything invites the next one, because the spot that attracted a bird once will attract another. The fix is a guard designed for a dryer termination — it keeps birds out while still letting the flap open and lint pass through.

What you should not do is cover the vent with a hardware-store screen. A screen keeps birds out, but it also catches lint, and within a few loads it clogs solid. Now you have traded a bird problem for a lint problem, and the dryer is blocked again. If a previous owner or a well-meaning handyman put a screen over your vent, that screen is likely part of why the vent keeps blocking.

What it costs

Removal plus a proper guard is $49, added to the appropriate vent cleaning rather than sold on its own, because the packed lint behind the nest has to come out at the same time. A standard first-floor wall exit cleaning is $129 and a roof or second-floor exit is $179. You approve the guard before we fit it, and a nest is, for what it is worth, the most dramatic before-and-after airflow number we ever record.

If you are hearing birds at the vent right now and there may be chicks, the honest advice is to wait until the nest is empty rather than rush it. Call us and we will help you time it, and get a guard on as soon as it is clear so this is the last time it happens.