Bird Nests, Squirrels & Pigeon Hazards in Brooklyn Dryer Vents: A Spring & Fall Survival Guide

Every spring, between roughly the second week of March and the end of May, our phone rings about three times a week with the same call. The homeowner is whispering, because they think the bird might hear them. They are standing in the laundry room. They can hear chirping. They want to know two things: is this going to set my house on fire, and what is the right thing to do about the birds.

This post is the answer to that call, written down. We have pulled hundreds of nests out of Brooklyn dryer vents, from a Bay Ridge garden-level wall cap that had been a four-generation sparrow colony, to a Dyker Heights soffit run that a squirrel had turned into a winter den. For the broader context on how dryer vents are routed through Brooklyn buildings, our complete Brooklyn guide is the foundation piece, and our roof, wall, and soffit guide walks through why each exterior configuration attracts a different kind of guest.

Brooklyn's most common dryer-vent invaders

Birds and small mammals do not pick dryer vents at random. They pick the species, the location, and the time of year that match their nesting biology. Here is the cast of characters we actually find, in order of frequency.

House sparrow (Passer domesticus). The number one culprit, citywide, by a wide margin. Roughly two-thirds of every nest we pull is a house-sparrow nest. They are small (about 6 inches long, under an ounce), aggressive, and they love a 4-inch round opening with a damaged flapper. House sparrows are a non-native species in North America, introduced from Europe in the 1850s, and as a result they are not protected by federal wildlife law. A typical sparrow nest is a messy ball of dry grass, straw, paper scraps, plastic strips, and feathers, packed into the first 12 to 36 inches of the duct just inside the cap. They raise two or sometimes three broods in a single season, which is why a sparrow problem ignored in April becomes a worse problem in July.

European starling (Sturnus vulgaris). Number two, especially in the brownstone belt and along Eastern Parkway. Starlings are larger than sparrows (about 8 inches, 3 ounces), more aggressive, and they prefer cavities that mimic dead-tree hollows. A 4-inch duct with a broken flapper is a perfect starling cavity. Also non-native (introduced to Central Park in 1890) and not federally protected. Nests are bulkier than sparrow nests, with more wood-chips and twigs than grass.

Pigeons (Columba livia, the common rock dove). A constant feature of Brooklyn rooflines, but they almost never nest inside a 4-inch duct. What pigeons do is perch on dryer caps, especially the larger 6-inch caps on commercial-style runs, and leave a steady accumulation of acidic droppings that corrode the cap's metal and can cement the damper flap open. Also non-native and not federally protected.

Squirrels (Eastern gray, Sciurus carolinensis). Less common than sparrows but considerably more destructive. We see squirrel intrusions concentrated in Dyker Heights, Marine Park, and within two blocks of Prospect Park. The common factor is mature trees with branches within jumping distance of a roof or rear wall. Squirrels will not generally nest inside a 4-inch duct (too narrow), but they will chew through a plastic cap to enlarge a 6-inch or 8-inch opening, and they will den in larger commercial ducts that share the rooftop with the dryer cap. When we do find squirrels in a dryer duct it is usually a winter overwintering situation, October through February.

Raccoons. Rare, because raccoons are too large for a 4-inch duct. We have pulled raccoon nests out of larger commercial ducts and out of the roof-jack pans around a cap, most often in Bay Ridge and Marine Park in spring birthing season.

Mice. Almost never in the duct itself. The duct interior is too smooth and too cold for mice to nest comfortably. If we find evidence during a job, it is almost always adjacent to the duct, not inside it.

The takeaway: when a Brooklyn homeowner calls about a bird in their dryer vent, the probability is roughly 65 percent house sparrow, 15 percent European starling, 10 percent pigeon (almost always perching, not nesting), 7 percent squirrel, and 3 percent everything else combined.

Why dryer vents are bird-magnet real estate

A house sparrow's ancestral nest site is a hole in a cliff face or a cavity under a roof tile: a sheltered cavity, sized to be defensible, high enough above ground that ground predators cannot reach it, with a small opening that opens into a larger chamber. A dryer vent matches every one of those criteria, and then adds three bonus features that no natural cavity provides.

First, warm air. A dryer vent used four or five times a week pumps 130 to 150 degree Fahrenheit air out of the cap for an hour at a time. In early spring, with overnight lows in the 30s and 40s, that warmth is the difference between a marginal site and an excellent one. We have measured wall-cap temperatures of 95 degrees Fahrenheit twenty minutes after a dryer cycle ended, in late March, with outdoor temps in the low 40s.

Second, shelter from rain. Almost every residential dryer cap has either an integral hood (wall and soffit) or a top cover (roof). Both designs explicitly keep water out. For a nesting bird, this is a free roof.

Third, easy access through a stuck or missing flapper. Almost every dryer vent cap has a flapper or damper that is supposed to close when the dryer is off. In practice, after one to three years of use, most flappers stop closing properly. They get coated with lint, warp from heat cycles, the pivot pin corrodes, the spring loses tension. A flapper that does not close all the way is a marked-open door for a sparrow. We can usually predict which caps have been nested in just by looking at the flapper from the ground.

The combination is irresistible: warm air, free roof, open door, defensible cavity, high off the ground. Brooklyn is one of the densest house-sparrow markets in North America. The wonder is not that birds keep nesting in dryer vents; the wonder is that any Brooklyn dryer vent gets through a spring without an attempt.

A dryer vent that nobody cleans is, from a sparrow's perspective, an unclaimed apartment with the heat already turned on.

When invasions happen

Bird behavior is sharply seasonal, and the calendar is the same year after year. We organize our prevention recommendations around three windows.

Spring nesting peaks: March through May. The main invasion window. House sparrows start prospecting in the first warm-ish week of March and begin actively building by mid-March. European starlings are two to three weeks behind, starting in late March. By the first week of May, most species are sitting on eggs. This is when the chirping calls start coming in.

Brood-rearing peak: May through June. A sparrow nest goes from egg-laying to fledging in about 24 to 28 days: 11 days incubation and 14 to 17 days from hatch to fledge. May and early June are when the chicks are loudest. The parents are flying back and forth all day, and the chicks are constantly begging. This is also when the duct becomes most blocked, because the parents continuously bring more lining material.

Fall overwintering: October through December. Less common, but a meaningful part of our annual call volume. Squirrels and (rarely) starlings will use a dryer duct or the cap area as a winter roost. The motivation is the same as in spring: warm air, sheltered cavity. The difference is that there are no eggs and no chicks, so the legal situation is simpler.

The quiet season: January, February, and July through September. In deep winter, most birds and squirrels are not actively prospecting. In high summer, the first brood has fledged and the second is wrapping up. These are the easy months to do prevention work.

Window	What is happening	Call urgency
Mar 1 - Apr 15	Sparrows and starlings prospecting and starting nests	High, prevent now
Apr 15 - May 15	Egg-laying and incubation	Critical, legal complications begin
May 15 - Jun 30	Chicks in the nest, daily traffic at the cap	Wait or coordinate, do not force
Jul 1 - Sep 30	Fledged, some second broods, mostly dormant	Easy removal and prevention window
Oct 1 - Dec 15	Squirrels and occasional starling overwintering	Moderate, easy removal
Dec 15 - Feb 28	Quiet season	Best time for cap upgrades

If you take one thing from this calendar: get a cap and flapper inspection done in late February. Every March-call we get is from a house that did not get its cap looked at in February.

What a sparrow nest does to airflow

Most callers worry first about the bird; they worry second about the dryer. The airflow consequences of even a partial nest are dramatic and they affect the dryer immediately.

A residential dryer vent in Brooklyn is almost always a 4-inch round duct. The cross-sectional area of a 4-inch duct is approximately 12.6 square inches. A typical house-sparrow nest, fully built, is roughly 4 to 6 inches in diameter as a packed ball, with a hollow nest cup at its center. The remaining clear cross-section through the nest cup is typically 1 to 2 inches in diameter, which is a clear area of about 0.8 to 3.1 square inches. So a half-blocked nest has reduced the effective flow area by roughly 75 percent.

But airflow does not drop linearly with area. It drops faster, because friction scales with how tight the tunnel is and how rough the walls are. A sparrow nest is also damp from chicks' droppings and food. Wet grass, lint, and feathers form an extremely high-friction lining. In practice, an anemometer reading we would expect at 1,500 to 2,000 FPM for a clean cap drops to 200 to 400 FPM with a typical sparrow nest in residence. That is an 80 percent drop in flow.

What does an 80 percent flow drop feel like? The cycle that finished a load of towels in 50 minutes now takes 90 minutes and the towels are still slightly damp. The dryer cabinet gets noticeably hotter to the touch. The high-limit thermostat starts to trip on full loads, shutting the dryer down mid-cycle. The lint screen starts collecting lint faster, because less air is moving through. And the laundry room itself starts to feel humid, because moisture-laden exhaust is finding its way back through the cabinet seals.

This is also when the fire risk climbs. A dryer exhaust path that cannot get rid of heat is a path where lint inside the duct accumulates faster and stays hotter. Our warning signs guide walks through what to look for at the dryer, the laundry room, and the exterior cap.

How to tell you have a bird in your dryer vent

There are five reliable indicators. The first one is usually enough.

Chirping or peeping. The smoking gun. If you can hear bird sounds coming from behind the dryer or from the laundry-room wall, you have a bird in the duct. In Brooklyn, the most common time to hear this is between 5:30 AM and 8:00 AM. The sound is distinctive: a thin, high cheeping that repeats every few seconds. House sparrow chicks beg with a continuous chirp-chirp-chirp. Starling chicks make a harsher, more raspy call.

Feathers, twigs, or grass at the cap. When you look at the exterior dryer cap from the ground, do you see anything that should not be there? A small piece of grass hanging out of the cap, a stray feather caught on the lip, twigs propped against the hood. Any of these means a nest is in active construction or in use.

Visible bird activity at the cap. Stand on the sidewalk or in your backyard for ten minutes during the morning. If you have a nest, you will see birds. They come and go on a 5 to 15 minute cycle, more frequently during the morning peak. The pattern is unmistakable.

Dryer suddenly taking much longer. A dryer that used to finish a load in 50 minutes and is now taking 90 minutes is telling you something is wrong in the duct. If the change is sudden, occurring over the span of one or two weeks rather than gradually over months, a nest is high on the list of suspects.

Visible nest material at the wall stub. With the dryer off and unplugged, pull it 8 to 12 inches away from the wall, twist off the foil flex hose at the wall stub, and shine a flashlight into the stub. If you see grass, straw, or feathers within the first 18 inches of the duct, you have an active or recently-active nest. Do not try to extract it yourself; getting halfway through a nest extraction without the right tools usually results in either a deeper plug or, worse, disturbing chicks you cannot then reach.

If you can hear chirping, do not run the dryer. The exhaust temperature can kill chicks at close range, and a dead chick deep in the duct turns a removable nest into a smelly, fly-prone biohazard.

The legal landscape

This is the part of the post we wish more pest-control companies would explain honestly. The legal framework matters, and it shapes what we can and cannot do.

The relevant federal law is the Migratory Bird Treaty Act of 1918. It makes it illegal to "take" any migratory bird species, or its eggs, nests, or feathers, without a federal permit. "Take" includes capturing, killing, harming, or disturbing an active nest. The list of protected species is long: it includes essentially every native songbird in North America, plus all native waterfowl, raptors, woodpeckers, swifts, and swallows.

The Act does not protect non-native birds that were introduced to North America. That category includes house sparrows, European starlings, and rock pigeons. All three are common dryer-vent invaders in Brooklyn. None are federally protected.

What this means in practice:

• A house sparrow nest with chicks or eggs in your dryer vent: legal to remove.
• A European starling nest with chicks or eggs in your dryer vent: legal to remove.
• A pigeon nest: legal to remove, though pigeons almost never nest inside a 4-inch duct.
• An American robin, house finch, chickadee, mourning dove, or any other native songbird with an active nest: not legal to remove without coordination.

We have, twice in the last several years, opened up a cap to find a house-finch nest. House finches are native, common in Brooklyn, and federally protected. In both cases we made the same call: confirmed species with a scope, photographed the nest, closed the cap back up, advised the homeowner that the dryer would need minimal use until fledging (about 24 to 28 days from when we found it), and scheduled a return visit for a full cleaning plus cap replacement once the nest was empty. The homeowner was, in both cases, surprised to learn that the law applied to their house. It does.

For cases where we cannot do an immediate removal, we typically suggest hang-drying laundry or using a laundromat for the duration. Three to four weeks is not a small inconvenience, but it is the legal reality, and the alternative (forcing a removal of a protected nest) carries individual fines that start at several hundred dollars. We will not remove an active protected nest without local wildlife coordination. If we cannot positively identify the species through the scope, we err on the side of treating it as protected.

What removal actually looks like

When we do an active-nest extraction, the workflow is specific and the order matters.

1. Scope the cap. Before we touch anything, one of us goes up to the cap with a flexible borescope camera. We push the camera in through the cap opening and look at what is actually inside. We are confirming three things: species, presence of eggs or chicks, and how far into the duct the nest extends.

2. Confirm legal status. If the species is house sparrow, starling, or pigeon, we proceed. If we see any other species, we stop, document, and have a conversation with the homeowner about timing.

3. Set up interior extraction. A tech goes back to the dryer. The dryer is pulled out, the transition hose is disconnected, and a HEPA vacuum is connected to the wall stub with a sealed cuff. The vacuum stays on for the entire extraction so that anything dislodged from the exterior gets pulled cleanly into the bag rather than into the room.

4. Extract from the exterior. The exterior tech uses a long flexible rod with a small spring-loaded claw on the end. For dense or wet nests, we use a small hook on a fiberglass rod that lets us cut a path through the nest material before pulling it out in pieces. We work from the cap inward, removing material in 6 to 12 inch sections.

5. Confirm cavity is clear. Once we cannot pull any more material out by grabbing, we run the borescope back in and confirm the duct is empty between the cap and the first elbow. If there is more nest behind the first elbow, we rod from the dryer side with a rotary brush.

6. Full duct clean. Once the nest is out, we run a full rotary-brush cleaning of the entire duct, from cap to dryer, with HEPA extraction at the dryer end. Nest residue includes grass, droppings, mites, and other parasites you do not want lingering. A "nest removal" without a full clean leaves the duct biologically dirty.

7. Inspect and replace the cap. Almost every active-nest extraction reveals a cap problem: the flapper is stuck, the spring is broken, the screen is missing, or the hood itself is cracked. The cap that allowed the nest is the cap that will allow the next one.

8. Final airflow check. Anemometer at the wall stub. We want at least 1,200 FPM, and on most jobs we see 1,800 to 2,400 FPM after a full extraction and clean.

A typical nest-extraction job runs 2 to 2.5 hours, sometimes longer if the cap is on a high roof. We document the work with photos.

Cap and flapper recommendations

The cap is everything. A properly specified and properly closed cap is the single most effective bird-prevention measure we know of.

The default recommendation: a spring-loaded flapper that closes flush. A hinged flap with a small torsion spring that holds the flap closed when the dryer is off. When the dryer runs, exhaust pressure pushes the flap open against the spring. When the dryer turns off, the spring pulls the flap closed within a quarter-inch of the cap's opening face, with no visible gap, no daylight, and no opening a sparrow could push through. This is what we install by default.

What we avoid: mesh screen. Almost every "bird-proof" dryer vent cap sold at a big-box hardware store has a fine wire mesh screen across the opening. The screen does keep birds out. It also traps lint on the mesh surface. Within 3 to 6 months on a regular-use dryer, the mesh becomes 50 percent or more clogged. Within 9 months it is essentially a solid disk of lint. Do not put a mesh screen on a dryer vent cap. Bath fans and kitchen exhaust can use mesh; dryers cannot.

Damper-style flappers. Some caps use a hinged damper instead of a flapper: a flat disc pivoting on a horizontal axis, with gravity holding it closed. Reliable, less prone to spring failure, closes flush when properly installed. We use damper-style caps in a lot of roof applications. The main downside is sensitivity to install angle.

Metal versus plastic. For Brooklyn, we recommend metal caps in almost all applications. Plastic caps degrade in UV exposure, become brittle in winter cold, and crack along the hinge. A plastic cap installed today is likely to be a problem cap within 5 to 7 years. A galvanized steel or aluminum cap will outlast the dryer underneath it.

The pivot pin matters. On any hinged cap, the most failure-prone component is the hinge pivot pin. Cheap caps use plastic; better caps use stainless steel in metal mounts. A flapper that does not move freely does not close all the way.

Summary: spring-loaded flapper, metal body, stainless pivot pin, no mesh screen.

The bird-guard debate

Aftermarket "bird guards" or "stand-off cages" are stainless-wire or galvanized cages that bolt onto the exterior of a dryer cap, forming a 4-to-6 inch protective shroud around the opening with bars or grid spacing of about half an inch. The idea is that even if the flapper opens (because the dryer is running), birds still cannot get into the opening.

The argument for guards. They unquestionably keep birds out. In a known repeat-invasion location, a stand-off cage adds a real layer of defense. Once you have already pulled a nest out of a particular cap, the probability that the same location will be invaded again the following spring is high.

The argument against guards. They trap lint. Every time the dryer runs, lint blows out and gets caught on the bars. Over time, the cage accumulates a layer of lint felt that reduces airflow and creates its own clogging problem. We have removed bird guards that, after two years of use without service, were almost completely felted over with damp lint. The cure had become the disease.

Our actual recommendation: a spring-loaded flapper alone is enough in 90 percent of cases. Only add a stand-off cage in known repeat-invasion locations, especially backyard wall caps within squirrel-jumping distance of trees or fences. If you do install a guard, the cleaning schedule tightens from every 12 to 18 months to every 9 to 12 months, because the guard's lint accumulation needs to be cleared on a more aggressive schedule. For roof caps on flat Brooklyn brownstone roofs, exposed to the sky and not adjacent to trees, no guard. Roof caps with proper flappers rarely get invaded.

Squirrel and rodent intrusions

Squirrels are the second-most-common dryer-vent invader in Brooklyn, and the consequences are different in kind from a bird intrusion. A bird nests inside the duct using imported material; a squirrel modifies the duct itself.

How squirrels get in. A gray squirrel can jump 8 to 10 feet horizontally and can drop more than 30 feet vertically without injury. In Brooklyn, the practical means of access are: jumping from a tree branch onto a roof and walking to the cap, jumping from a fence to a rear wall cap, climbing a downspout to a wall or soffit cap, or coming down through damaged roof flashing into a duct chase. If you have a tree branch overhanging your roof or yard within 8 to 10 feet of a vent cap, you have a squirrel access route.

What squirrels do to a duct. Unlike sparrows, squirrels are not satisfied with a 4-inch cavity. They will use a 6-inch or larger duct as a winter den, and if the cap is plastic, they will chew through the cap to enlarge the opening. We have seen plastic caps with golf-ball-sized chew holes in the flapper assembly. Inside the duct, squirrels scratch and chew at any joint that has been sealed with foil tape, often opening up gaps that then leak conditioned air and moisture into the wall cavity. The damage can require duct replacement, a significantly larger job than a nest extraction.

Indicators of a squirrel. Scratching sounds, not chirping. Squirrels are largely silent, but they generate distinctive scratching and rustling, especially in the early morning. Other indicators: nut shells, leaves, and woody debris appearing in the laundry room (because the squirrel is bringing food cache material into the duct), and visible chew marks on the exterior cap. A squirrel in residence will also generate a much stronger ammonia smell than a bird.

Removal approach. Squirrels require live trapping or one-way exclusion. We do not attempt to grab a squirrel directly from the duct; we install a one-way door on the cap that allows the squirrel to leave but not return, wait 24 to 48 hours for confirmation of departure (often using a flour-dust tracking patch), and then seal and replace the cap. If we suspect there are nestlings (May through July is squirrel nesting season as well), we delay exclusion until the nestlings are mobile.

Mice in the duct. Genuinely rare. Mice prefer wall cavities, drywall paper, insulation, and stored boxes over duct interiors. If we find mouse evidence during a dryer-vent job, it is typically in the wall cavity adjacent to a duct that has separated at a joint, and the fix is sealing the duct rather than treating its interior.

Pricing

Brooklyn dryer vent nest extractions are priced based on what we find, where the cap is, and what the cap itself needs. Here are the ranges we actually quote, in 2026 dollars.

Standard sparrow or starling nest extraction with full duct clean. Confirm species, extract from exterior, full HEPA clean, before-and-after airflow readings, photo documentation. $325-$500. The range moves on roof versus wall cap, total duct length, and how dense the nest is.

Cap replacement. Almost always recommended as part of a nest job, because the cap that allowed the nest is the cap that will allow the next one. Add $75-$200. The range moves on basic wall cap (lower end), roof cap with flashing integration (middle), or a soffit cap that requires custom adaptation (upper end).

Optional stand-off cage / bird guard. Only recommended in known repeat-invasion locations. Add $40-$90 installed.

Squirrel exclusion and cleanup. Higher than a bird job because of the multi-visit nature: install one-way door, return visit to confirm departure, final cap replacement and clean. $450-$750, sometimes more if duct repair is required (add $150-$400 depending on length and access).

Roof access surcharge. On steeply pitched roofs or buildings without a parapet hatch, we may need to bring a longer ladder and additional safety gear. Add $50-$150.

These ranges are fair and consistent with what a Brooklyn homeowner should expect from a properly insured local crew. If you are quoted significantly less, ask what is being skipped (the borescope inspection? the full duct clean? the cap replacement?). Our broader cost context lives in the Brooklyn cost guide.

Preventive maintenance schedule

The single highest-leverage thing a Brooklyn homeowner can do is two annual cap inspections, timed to the seasonal calendar.

Late February to early March: pre-nesting inspection. The most important visit of the year for bird prevention. We check the cap and flapper for free movement, replace any cap that shows wear, clear debris from the previous fall, and confirm no animal has begun overwintering. This visit catches problems before March prospecting begins.

October to early November: post-summer clean and pre-winter inspection. Clears the lint and pollen buildup from spring and summer, confirms the cap is closing properly, and gets the duct ready for the heavy use of winter. Also catches squirrel and starling overwintering attempts before they get established.

Combined, these two visits cost less than one major nest extraction and they eliminate the great majority of bird and animal problems. For Brooklyn households that have had a prior intrusion, we sometimes add a third midsummer visit specifically focused on cap inspection.

In Bay Ridge specifically, where backyard sparrow populations are dense, we recommend the two-visit schedule for every house we service. Our Bay Ridge guide covers the neighborhood-specific patterns.

Visit timing	Primary purpose	Typical duration
Late Feb - early Mar	Pre-nesting cap and flapper check, light duct clean	60-90 min
Late Oct - early Nov	Post-summer clean, pre-winter pest check, full duct	90-150 min
Optional: late June	Mid-season cap check, repeat-invasion houses only	30-45 min

A real Brooklyn extraction walkthrough

To make this concrete, here is a job we did last May, with details lightly anonymized.

The call came in on a Tuesday morning, the second week of May. The homeowner lived in a four-story brownstone in the south end of Park Slope, with the dryer on the third floor in a primary-suite closet, venting via a 38-foot run up to a rooftop cap. The complaint was a dryer running long for about three weeks, and starting that weekend, the homeowner had heard distinct chirping from behind the laundry-closet wall. She had pulled the dryer out, disconnected the transition hose, and shined a flashlight into the wall stub. She could see grass and feathers within the first foot.

We arrived at 11:00 AM. The first thing we did was take the borescope up to the roof. The cap was a standard wall-style mounted vertically on the parapet face. The flapper was hanging open, lodged in place by a wedge of dry grass. We pushed the borescope in and saw the nest: house sparrow, well-built, lined with what looked like dryer lint, with four pale eggs in the cup. Distance from cap to nest face: about 8 inches. Distance from cap to back of nest: about 16 inches. No visible chicks yet.

We confirmed species: house sparrow, non-protected, legal to remove. We checked with the homeowner one more time before proceeding. She gave the go-ahead.

The interior tech set up the HEPA vacuum at the wall stub on the third floor. The exterior tech, on the roof, removed the flapper assembly entirely and started extracting nest material with a long-claw rod. The first pass pulled out the bulk of the surface material in two big handfuls. The second pass got the nest cup, with the eggs intact.

After the nest material was out, we ran the borescope back in to confirm clear duct. We saw a small amount of residual grass and droppings on the duct floor, but no remaining structure. We then proceeded with a full rotary-brush cleaning of the entire 38-foot run, working from the cap downward, with HEPA extraction at the dryer end the whole time. The brushing took about 35 minutes; we hit two minor lint accumulations at elbow transitions, but no major plugs.

Final airflow at the wall stub: 1,920 FPM. We had not taken a pre-extraction reading because the dryer was already disconnected; based on the nest density, our estimate is the duct was probably running at 200 to 400 FPM with the nest in place. The post-job number was 5 to 10 times the pre-job number.

The cap itself needed full replacement. The flapper spring was broken, the screen had corroded, and the gasket between the cap and the parapet face was failing. We installed a new metal cap with a spring-loaded flapper and stainless pivot pin, sealed the parapet penetration with high-temperature silicone, and re-flashed the seam with a thin aluminum collar.

Total time on site: 2 hours 50 minutes. Total cost: $510 (nest extraction and full duct clean at $410, cap replacement at $100). The homeowner has been on a twice-annual maintenance schedule with us since.

The detail worth noting: she had not had her dryer vent cleaned in over four years. The cap had been failing for at least two of those years. If she had been on a twice-annual schedule, we would have caught the failing cap in the February before the sparrows arrived, replaced it for $125, and the nest would never have happened.

Frequently asked questions

Can I just block the vent until the birds leave? No. Blocking the vent traps the birds inside, where they will die from heat or starvation. A dead bird in a duct becomes a biohazard removal job, with flies and smell. If you have an active nest you cannot legally remove, the right move is to stop using the dryer (hang-dry or laundromat) for the duration of the nesting cycle, and coordinate with us on a properly timed removal afterward.

What if the birds are in the wall, not the duct? This sometimes happens. If a duct has separated from a fitting inside the wall cavity, birds can end up in the wall space rather than the duct itself. The symptoms are similar, but the access route is different. We use the borescope through the cap to determine which, and we route the job accordingly. Nest-in-wall jobs often require a small drywall access cut, which we typically subcontract to a finish carpenter for proper patching.

Is my homeowner's insurance going to cover this? Usually not, unless there is documented secondary damage like a dryer fire or water damage to finished surfaces. The nest extraction itself is considered routine maintenance. We can provide detailed documentation for any insurance claim that does involve covered damage.

Why not just put a fine screen on every dryer cap? Because fine screens clog with lint and reduce dryer airflow, which causes the exact set of problems (long dry times, overheating, fire risk) that you were trying to avoid by getting the dryer vent cleaned in the first place. A spring-loaded flapper alone, properly installed, keeps birds out without the lint-trapping problem.

My building is a co-op. Who is responsible, me or the building? As a general rule in Brooklyn: the dryer and the transition hose are the shareholder's responsibility; the duct inside the wall is sometimes shareholder, sometimes building, depending on the co-op; the exterior cap is almost always the building's responsibility. Nest extractions usually involve all three, so a conversation with the board has to happen. We provide written reports specifically formatted for board review.

Do ultrasonic bird repellers work? The evidence is weak. House sparrows in particular do not respond reliably to ultrasonic signals, and the devices marketed for dryer-vent use are generally low-quality consumer electronics that fail within a year or two. We do not recommend them. The cap-and-flapper approach is more reliable, more durable, and significantly cheaper over the long run.

Will the smell go away after the nest is removed? Yes, usually within a week, provided the full duct clean is done as part of the extraction. The smell comes primarily from nest droppings and food remnants, all of which are removed by the HEPA cleaning step. If a smell persists more than two weeks after a full clean, we come back and investigate.

Can you do the job while I am at work? Yes, on most Brooklyn jobs. We need access to the dryer area and to the cap. For interior access, many homeowners leave a key with us or with a neighbor. For roof access in brownstones, we need either a parapet hatch we can use independently, or coordination with the building. We document everything with photos and a written report.

What happens to the chicks or eggs you remove? For native protected species we do not remove active nests at all (we wait for fledging). For non-native species (house sparrows, starlings), we follow standard pest-management protocols for humane handling and disposal. We do not enjoy this part of the work, and we do not pretend that it does not happen, but the alternative (an unmanaged non-native population in a residential vent system) is worse for the birds and for the homeowner.

How fast can you respond if I hear chirping right now? For active nest situations during spring, we typically book within 3 to 7 days. If the situation is urgent (e.g., a chick has fallen into the dryer cabinet, or there is visible smoke), we treat it as same-day. For non-urgent prevention work outside the spring window, our standard scheduling is within 1 to 2 weeks.

When to call us

If you are in Brooklyn and you can hear chirping behind your laundry-room wall, do not run the dryer, and do not try to push anything into the duct yourself. Call us at (718) 541-5567, or book directly through /book. We will scope the cap with a borescope, confirm what species you have, walk you through the legal picture if it applies, and schedule the right kind of intervention.

If you are not hearing chirping but want to get ahead of the season, the February cap inspection prevents almost every spring nest. Booking between February 15 and March 5 is the single most cost-effective thing you can do.

For broader context, our complete guide covers code and cleaning frequency, the cap routing guide covers exterior configurations, and the warning-signs guide is the diagnostic checklist. For neighborhood patterns, see the Bay Ridge guide, Ditmas Park / Flatbush / Midwood guide, and Park Slope guide.

We are Vent Pro NYC. We are the crew that knows what is living in your wall, and how to get it out without setting your house on fire or running afoul of federal wildlife law. Call (718) 541-5567 when you are ready.