Is the house sparrow protected under federal law?

No. The house sparrow (Passer domesticus) is not protected by the Migratory Bird Treaty Act. The USFWS 2020 Federal Register ruling specifically exempts non-native, human-introduced species from MBTA protections, and the house sparrow is included on that list. This means it is federally legal to deter, exclude, and remove house sparrows and their nests without a federal permit. However, native sparrows — song sparrows, white-throated sparrows, chipping sparrows, and others — ARE protected under the MBTA. You must confirm the species before removing any nest.

Is a house sparrow a 'real' sparrow?

No — and this is a fact most pest control resources skip. The house sparrow belongs to the family Passeridae, the Old World weaverbirds, which is a completely different bird family from native North American sparrows. Native sparrows belong to Passerellidae (formerly Emberizidae) and are genuinely different birds that evolved on this continent. The house sparrow was introduced from Europe in the 1800s. This distinction matters because native sparrows are protected under the MBTA; the house sparrow is not. Calling it a 'sparrow' creates genuine confusion about its legal status.

Can I legally remove a house sparrow nest from my dryer vent?

Federally, yes. Because house sparrows are not protected by the MBTA, removing their nests does not violate federal law. That said, there are two important caveats. First, confirm the species is actually a house sparrow — female house sparrows look similar to female native sparrows, and native sparrows nesting in nearby vegetation are protected. Second, after clearing the nest, install a vent guard immediately. A cleared-but-unprotected vent will be reoccupied within days. If there are eggs or young and you are uncertain about timing or species, a licensed pest professional can help.

How do I tell a house sparrow from protected native sparrows?

The male house sparrow is actually easy to identify: look for the solid black bib on the throat. No native New Hampshire sparrow has a solid black throat patch — it is unique to male house sparrows. For females and juveniles, the distinction is harder: house sparrow females are plain buff-brown with a pale eyebrow stripe and a heavy, conical bill. Native sparrows (song, white-throated, chipping) tend to be more heavily streaked on the breast and flanks and favor vegetation edges rather than building interiors. When in doubt about a nest in a cavity or vent, do not remove it without professional ID.

Will house sparrows bring mites into my house?

Yes, indirectly. House sparrow nests harbor bird mites — primarily Ornithonyssus sylviarum (northern fowl mite). The mites feed on nesting birds and remain in the nest while the host is present. When house sparrows fledge for the season or are excluded from a roost, the mites lose their food source and disperse. They can travel through the vent opening or wall gap into the adjacent living space and bite humans, causing skin irritation. Bird mites cannot complete their life cycle on people, but an active infestation in walls or around vents needs to be addressed. See our bird mite page for ID and treatment steps.

What diseases do house sparrow droppings carry?

House sparrow droppings can harbor several pathogens, with histoplasmosis being the most significant concern. Histoplasma capsulatum is a fungus that grows in accumulated bird droppings; disturbing dried material releases spores that can cause a lung infection ranging from mild to severe. The risk is primarily from inhaling disturbed dried droppings — wet-cleaning with a respirator (N95 or P100) and gloves eliminates most of the hazard. Salmonella contamination of food prep surfaces is also a documented risk from birds foraging near food areas. Cryptosporidiosis and campylobacteriosis have been associated with bird droppings as well, though house sparrows are lower-risk than pigeons for these specifically.

Why do house sparrows nest in vents and signs?

House sparrows are cavity nesters by nature — in their native range they use rock crevices and tree holes. In the built environment, dryer vents, exhaust vents, gable openings, behind signs, and inside streetlight fixtures are functionally identical to natural cavities: enclosed, weatherproof, and with a small opening. They prefer sites near food sources, which is why commercial buildings with outdoor seating or food waste are particularly attractive. Flapper-style vent louvers, the standard on most builder-grade vents, offer no real resistance to sparrows. Mesh vent guards are the only durable fix.

How do I protect bluebird boxes from house sparrows?

This is an active challenge for NH bluebird trail managers. The most effective approaches: (1) Hole size — 1.5-inch entrance holes are correct for Eastern bluebirds and admit them while making access harder (though not impossible) for house sparrows. (2) Active monitoring — check boxes weekly during nesting season and remove house sparrow nesting material promptly before eggs are laid. (3) Location — siting boxes away from buildings and tree lines and in open meadow settings is less attractive to sparrows. (4) Sparrow Spooker and other site-specific deterrents can reduce sparrow use during active bluebird nesting. Contact NH Audubon for state-specific guidance on bluebird box management.

Can house sparrows damage my home?

Yes, primarily through nesting. Their bulky nests in dryer vents block airflow and are a leading cause of dryer-related fires — nesting material is highly flammable and the blockage causes the dryer to overheat. Stove and furnace exhaust vents blocked by nesting material can cause carbon monoxide to back up into living spaces. Nests in gutters and downspout openings trap water and debris, contributing to water intrusion and wood rot. Dropping accumulations under roost sites stain and corrode building materials over time, though less aggressively than pigeon droppings.

House sparrow · Passer domesticus

BirdsNH resident

House Sparrow in New Hampshire — ID, Signs & Control

Also called English sparrow

The house sparrow is a non-native weaverbird (not a true sparrow) that is not protected by the Migratory Bird Treaty Act. It stuffs vents, building cavities, and nest boxes with messy nests and displaces protected native species. The male's black bib is the clearest field mark separating it from protected native sparrows. Exclusion comes first; confirm ID before removing any nest.

At a glance

Size: ~6 in, ~1 oz; Stocky build; stout conical bill
MBTA status: Not protected; USFWS 2020 Federal Register — non-native introduced species exempt
Family: Passeridae (weaverbird); NOT the same family as native sparrows (Emberizidae/Passerellidae)
Introduced: 1800s from Europe; Multiple introductions to East Coast cities; now continent-wide
Broods per year: Multiple; 1–8 eggs per clutch; ~26 days egg to fledge (Avian Report)
Key field mark: Male's black bib; Clearest separation from protected native sparrows — no native sparrow has a solid black bib

The short of it

The non-native weaverbird in your vents — not a true sparrow

The house sparrow (Passer domesticus) is one of the most common birds at New Hampshire buildings — and one of the most frequently misidentified. Despite its name, it is not a true sparrow at all. Native sparrows belong to the family Passerellidae (formerly Emberizidae); the house sparrow belongs to Passeridae, the Old World weaverbirds. That taxonomic distinction carries a legal consequence: native sparrows are protected by the Migratory Bird Treaty Act, while the house sparrow is not.

The USFWS 2020 Federal Register ruling makes this explicit: the MBTA does not apply to non-native, human-introduced species. Passer domesticus is on that list alongside the European starling. Native sparrows — song sparrows, white-throated sparrows, chipping sparrows — are not, and disturbing their nests is a federal violation.

This means careful identification before any nest removal is not just good practice; it is legally required. The male house sparrow's solid black bib is the single most reliable field mark to separate it from all protected native sparrows. Female and juvenile house sparrows are plainer and require more care in identification. When in doubt, do not touch the nest.

Identify it

How to identify a house sparrow

The male house sparrow is distinctive; the female and juvenile are plain and require more care. The stout, conical seed-cracking bill, chunky body, and ground-hopping behavior near buildings are consistent across sexes and ages.

Species profile

House sparrow

Scientific name: Passer domesticus
Family: Passeridae (Old World weaverbirds — NOT the same family as native sparrows)
Size: ~6 inches; approximately 1 oz
Coloration: Male: gray crown, solid black bib, chestnut nape, white cheeks, streaked brown back. Female/juvenile: plain buff-brown above, dirty white below, pale buff eye stripe.
Habitat: Building vents, eave gaps, signage, streetlights, barn eaves, nest boxes — any enclosed cavity near human structures.
Active season: Year-round; nesting March–August; multiple broods per season
Diet: Primarily grains, seeds, and bread scraps; thrives on food waste near humans. Stout bill crushes seeds.
Reproduction: 1–8 eggs per clutch; multiple broods per season; approximately 26 days from egg to fledgling (Avian Report).
Lifespan: Wild average 1–3 years; up to 13 years recorded

One of the most abundant birds in the world; common across all of New Hampshire year-round wherever human habitation exists.

The tells — key ID features

Male has a solid black bib on the throat and breast — no native sparrow has this mark.
Stout, conical, seed-cracking bill — heavier and more curved than native sparrow bills.
Chunky body with a short tail; tame ground-hopping near buildings and sidewalks.
Bulky, dome-shaped or messy cavity nests stuffed with grass, feathers, paper, and string.
Constant chirping flocks near building eaves, parking lots, and fast-food restaurants.
Female and juvenile are plain buff-brown — look for the pale eyebrow stripe and heavy bill.

Size, to scale

The insect

~6 inches

Compared to

About the size of a ping-pong ball in the body — noticeably smaller than a European starling (8–9 in)

Looks bigger than it is

Female and juvenile house sparrows look very plain and can be mistaken for native sparrows. The heavy, conical bill and association with building structures (vs. shrubs and fields) help separate them.

Is it actually this? — the confusion species

Native song sparrow

How to tell — Song sparrows are heavily streaked on breast and flanks with a central breast spot; they have a thinner bill and prefer vegetation edges. Song sparrows are fully protected under the MBTA. House sparrow females lack the heavy streaking.

Native white-throated sparrow

How to tell — White-throated sparrows have a distinct white throat patch, yellow lores (in front of eye), and bold head stripes. Protected under the MBTA. The house sparrow female is much plainer with no white throat.

Female house finch

How to tell — Female house finches have a heavily streaked breast and a more curved, seed-cracking bill; they lack the plain buff-brown cap of the female house sparrow. House finches are protected under the MBTA.

Juvenile European starling

How to tell — Juvenile starlings are plain gray-brown like female house sparrows but are much larger (8–9 in vs 6 in) with a long, pointed bill. Starlings also walk and strut; house sparrows hop.

What you'll notice

Signs of a problem

House sparrows announce their presence through persistent chirping, messy nests in unexpected places, and the eviction of native birds from nest boxes.

Bulky, messy nests — grass, feathers, string, paper — stuffed into a dryer vent, bathroom vent, or eave gap

What it means — Active or recent house sparrow nesting; a fire and blockage hazard requiring vent inspection and clearing.

Constant, repetitive 'cheep cheep' chirping from inside a building cavity, vent, or eave

What it means — Breeding pair in residence; young may be present.

Native bluebirds or tree swallows abandoning a nest box they previously used

What it means — House sparrows may be actively taking over; if sparrow nesting material is inside, the nest box has been claimed.

Dropping accumulations on ledges and pavement below nesting or roosting sites

What it means — Active roost or nest above; droppings can carry disease and should be cleaned with PPE.

Tame, ground-hopping flocks near outdoor dining, dumpsters, or parking lots

What it means — Established foraging colony; nesting sites will be nearby in adjacent building structures.

Scratch marks, debris, or feathers around vent louvers

What it means — Birds are actively entering or have recently nested in the vent.

How much it matters

The real risks, calibrated

House sparrows do not bite or sting, but their nesting habits create structural, health, and ecological risks around NH homes and businesses.

Overall risk

Moderate

Vent blockage and fire risk

Moderate

Onset: Within weeks of nesting start

The large, bulky nests house sparrows build inside dryer and exhaust vents can fully block airflow. A clogged dryer vent is one of the leading causes of residential structure fires in the U.S. Stove and furnace vent blockage can create carbon monoxide hazards.

Histoplasmosis and dropping-borne disease

Moderate

Onset: Risk increases with accumulation volume

Bird droppings, including those from house sparrows, can harbor Histoplasma capsulatum. Disturbing dried droppings — particularly by dry-sweeping — releases fungal spores that can cause histoplasmosis. Use N95 respirator and gloves; wet the material before cleaning.

Bird mites entering the living space

Moderate

Onset: After birds vacate or are excluded from a nest

Bird mites that fed on nesting house sparrows will disperse into adjacent rooms when the host birds leave. They can bite humans and cause skin irritation. They cannot complete their life cycle on people but an active mite infestation in walls or around vents requires treatment.

Gutter and cavity blockage

Moderate

Onset: Accumulates over a nesting season

House sparrow nests in gutters, downspout openings, and roof gaps can trap water and debris, leading to water intrusion and rot.

Displacement of protected native species

Moderate

Onset: During nesting season

House sparrows aggressively evict native bluebirds, tree swallows, and other cavity nesters from nest boxes, sometimes killing adults, eggs, and young. This is a significant conservation concern in New Hampshire where bluebird trail programs are active.

What you can do

DIY — what works, what backfires

Exclusion is the most effective and legally safest approach. The single most important rule: confirm the bird is a house sparrow — not a protected native sparrow — before removing any nest.

What actually works

Install 1/4-inch hardware cloth or commercial vent guards over dryer, bathroom, stove, and gable vents before March when nesting begins.
Use native-bird-sized nest box hole diameters — 1.5-inch holes admit bluebirds and most swallows while making entry more difficult for sparrows (though not impossible for determined pairs; monitor actively).
Remove house sparrow nests from nest boxes promptly after confirming species — this discourages re-nesting and protects native birds.
Use sparrow-specific traps on nest boxes during nesting season; check frequently and release non-target species.
Wet-clean dropping accumulations with a disinfectant solution; wear an N95 respirator and disposable gloves. Never dry-sweep.
Seal eave gaps, sign cavities, and soffit openings after confirming they are unoccupied.

What backfires

Don't remove any nest without first confirming the species is a house sparrow — native sparrows nesting in adjacent vegetation are protected and look similar to female house sparrows.
Don't dry-sweep or vacuum heavy dropping accumulations without respiratory protection — histoplasmosis risk is real.
Don't ignore a blocked dryer vent — the fire risk is immediate and escalates quickly as nesting material accumulates.
Don't use broad-spectrum poisons — they kill non-target birds and are not a durable solution.
Don't assume the vent is clear after clearing it once — house sparrows will re-enter and rebuild within days if no cover is installed.

Local Context

House sparrows in New Hampshire homes and businesses

House sparrows are year-round residents across New Hampshire wherever people live and work. They nest in building vents, behind signage, in eave gaps, under solar panels, and inside streetlight fixtures across Manchester, Nashua, Concord, Derry, Bedford, Salem, and beyond. Their bulky, messy nests can block dryer and bathroom vents, creating fire and airflow hazards. Nest mite complaints are common in late summer after fledglings leave. NH is also home to native bluebirds and tree swallows that use the same nest boxes — house sparrows actively evict and kill these protected species, making monitoring and exclusion an important conservation issue in the state.

Peak season

Year-round resident; nesting March–August (multiple broods); mite complaints peak July–September

You might actually have

European starling (also unprotected — competes for the same cavities)
Native song sparrow (protected — streakier, no bib, hops in vegetation)
Native white-throated sparrow (protected — white throat stripe, yellow lores, very different pattern)

We serve these communities

ManchesterNashuaConcordDerryBedfordSalemLondonderryHudsonMerrimackGoffstownRaymondPelham

Hillsborough · Rockingham · Merrimack Counties

NH-licensed applicator · #782664
Same-day service
Family-owned since 2017

Service Area Map

Southern New Hampshire

When it's past DIY

When to call a pro for house sparrow control

When house sparrows have nested inside vent systems, are roosting in large numbers on commercial properties, or when a mite infestation has developed after birds vacated, a licensed technician can confirm species ID, safely remove nesting material, install lasting physical exclusion, and treat for ectoparasites.

Signals it's past DIY

When to call a pro

House sparrows have nested inside a dryer, stove, or bathroom vent and you cannot safely clear and cap it yourself.
Dropping accumulations are heavy and require PPE-equipped wet remediation beyond a minor cleanup.
Bird mites have entered the living space after a house sparrow nest was vacated.
You cannot confidently confirm whether the nesting bird is a house sparrow or a protected native sparrow.
Sparrows are nesting in multiple locations across a commercial property and a coordinated exclusion plan is needed.

Keep them out — prevention

NH-specific

Cap vents before March

House sparrows begin scouting nest sites in late winter. Install vent guards on all exhaust vents before nesting season to deny access permanently.

NH-specific

Monitor nest boxes actively

If you maintain bluebird boxes or swallow boxes, check them weekly during nesting season (April–July in NH) and remove house sparrow nesting material promptly to protect native occupants.

Remove food attractants near buildings

House sparrows thrive on outdoor food waste. Remove or cover dumpsters, clean up spilled birdseed, and manage outdoor dining debris to reduce the attractant that sustains colonies.

Seal building gaps annually

Walk the roofline and eaves each fall to identify new gaps in soffits, fascia, and siding. Seal with appropriate materials after confirming vacancy.

Not sure it's a house sparrow?

A licensed NH technician can confirm the species and tell you honestly whether it's a DIY fix or a job for a pro — free inspection, same-day service across Southern New Hampshire.

Get a Free Inspection (603) 785-0118

Common Questions

Frequently asked questions

Sources(5)

[1]
Maine DACF — Starling and House Sparrow Fact Sheet
biology, nesting behavior, native bird displacement, cavity nesting
govverified 2026-06-30
[2]
USFWS Federal Register 2020 — MBTA Applicability
non-native species MBTA exemption
govverified 2026-06-30
[3]
Cornell Lab — All About Birds: House Sparrow
species ID, range, MBTA status, native sparrow contrast
academicverified 2026-06-30
[4]
Avian Report — House Sparrow
egg-to-fledge timing, diet, reproduction
industryverified 2026-06-30
[5]
CDC NIOSH — Histoplasmosis and the Environment
histoplasmosis risk from bird droppings, PPE guidance
govverified 2026-06-30

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

Verify license

Last updated 2026-06-30

New Hampshire pest control

Dealing with house sparrows in your home?

Anchor Pest Services identifies and handles house sparrow problems across southern and central New Hampshire. Family-owned since 2017, NH license #782664.

Get a Free Inspection (603) 785-0118

NH-licensed applicators (#782664)
Same-day service · free inspection
Family-owned since 2017

Keep Exploring

House Sparrow in New Hampshire — ID, Signs & Control

The non-native weaverbird in your vents — not a true sparrow

How to identify a house sparrow

The tells — key ID features

Size, to scale

Native song sparrow

Native white-throated sparrow

Female house finch

Juvenile European starling

Signs of a problem

Bulky, messy nests — grass, feathers, string, paper — stuffed into a dryer vent, bathroom vent, or eave gap

Constant, repetitive 'cheep cheep' chirping from inside a building cavity, vent, or eave

Native bluebirds or tree swallows abandoning a nest box they previously used

Dropping accumulations on ledges and pavement below nesting or roosting sites

Tame, ground-hopping flocks near outdoor dining, dumpsters, or parking lots

Scratch marks, debris, or feathers around vent louvers

The real risks, calibrated

Vent blockage and fire risk

Histoplasmosis and dropping-borne disease

Bird mites entering the living space

Gutter and cavity blockage

Displacement of protected native species

DIY — what works, what backfires

What actually works

What backfires

House sparrows in New Hampshire homes and businesses

When to call a pro for house sparrow control

Cap vents before March

Monitor nest boxes actively

Remove food attractants near buildings

Seal building gaps annually

Not sure it's a house sparrow?

Frequently asked questions

Dealing with house sparrows in your home?

Your next step

How to Get Rid of House Sparrows

When Do Birds Nest? NH Timing & Legal Guide

Bird & Bat Prevention: Legal, Humane Exclusion in NH

Can starlings or pigeons clog vents or drains?

Do birds nesting in vents cause problems?