Birds that Nest in Holes in Walls in the UK

Gold Hill in Shaftesbury, Dorset | julian elliott

If you have noticed a bird repeatedly disappearing into a small hole in your brickwork, under the eaves, behind a fascia board, or beneath roof tiles, there may be a nest hidden inside the building.

Several British birds naturally seek enclosed cavities for nesting, and houses can provide excellent substitutes for holes in trees or cliffs. House Sparrows and Starlings are among the most likely birds to nest in holes associated with UK homes, while Swifts are particularly well known for nesting in small gaps high in buildings. Blue Tits, Great Tits, Wrens, Jackdaws, and occasionally Feral Pigeons can also use openings in buildings.

The size and position of the hole—and the bird entering it—can usually help you identify your unexpected neighbour.

⚡ Quick Answer: UK Birds That Nest in Holes in Walls

Bird	Likelihood Around Buildings	Typical Nest Site
House Sparrow	Very high	Holes in walls, eaves, roof spaces and crevices
Starling	Very high	Roof gaps, wall cavities, eaves and larger holes
Swift	Very high in suitable buildings	Small gaps beneath tiles, eaves, soffits and wall cavities
Blue Tit	Occasional	Small holes in masonry and old pipe openings
Great Tit	Occasional	Larger holes in walls and other cavities
Wren	Moderate around suitable structures	Nooks, cracks, walls and sheltered crevices
Jackdaw	Occasional in large openings	Chimneys, large wall cavities and old buildings
Feral Pigeon	Occasional where openings are large	Roof spaces and large structural holes
House Martin	Usually outside the wall	Mud nest beneath eaves

🐦 House Sparrows

House Sparrows are one of the most likely birds to nest in holes in UK houses.

They have lived alongside people for centuries and commonly choose cavities and crevices in buildings rather than nesting out in the open.

Possible nesting sites include:

Holes in brickwork
Spaces beneath roof tiles
Gaps under eaves
Openings behind fascia boards
Spaces beneath gutters
Wall cavities
Gaps around older buildings

House Sparrows are sociable birds, so several pairs may sometimes nest close together.

This means that if you notice numerous sparrows congregating around one side of a building, there may be more than one nest.

How to identify a House Sparrow

Male House Sparrows have:

A grey crown
Chestnut-brown sides to the head
A black throat and bib
Brown, streaked wings and back

Females are less boldly marked and are mostly brown and buff.

Their familiar repeated cheep-cheep calls can often be heard around the nest.

If a small brown bird repeatedly disappears into a gap beneath your roof, House Sparrow should be near the top of your list.

🐦 Starlings

Starlings are another very common bird to find nesting within UK buildings.

They require a somewhat larger cavity than House Sparrows and often enter roof spaces through gaps between tiles, gutters, fascia boards, or other openings.

A Starling nest may be tucked into:

A wall cavity
A hole beneath roof tiles
A damaged soffit
An opening beneath the eaves
A gap in an older building
A cavity around the roofline

Starlings are noisy birds, and a family living inside part of your house can be surprisingly easy to hear.

How to identify a Starling

Adult Starlings appear dark from a distance, but in good light their feathers have beautiful green and purple iridescence.

During the breeding season, look for:

Glossy dark plumage
A pointed yellow bill
Short tail
Triangular wings

Their calls are extraordinarily varied and may include whistles, clicks, rattles and squeaks.

You may also hear adults walking or moving about inside a roof space.

🪽 Swifts

One of Britain’s most characteristic building-nesting birds is the Swift.

Unlike birds that simply take advantage of houses occasionally, Swifts have become strongly dependent on buildings for nest sites in many parts of the UK.

They nest in tiny gaps including:

Spaces beneath roof tiles
Holes beneath eaves
Openings in soffits
Small wall cavities
Cracks high on old buildings

A Swift may approach its nest at astonishing speed, tuck its wings in and disappear through an opening that barely seems large enough to admit a bird.

How to tell if Swifts are nesting in your wall

Watch for dark, sickle-winged birds screaming around rooftops.

Groups of Swifts often race around buildings at high speed, producing their distinctive shrill calls.

If one repeatedly vanishes into the same small opening high on a building, you have probably found a nest site.

Swifts are migratory. They generally arrive in the UK during spring and leave again toward the end of summer.

They can also be extremely faithful to successful nest sites, returning to the same location in later years.

This makes it particularly important not to accidentally seal an established Swift nesting hole during renovations.

🔵 Blue Tits

The colourful Blue Tit normally nests in holes in trees and nest boxes, but houses can occasionally provide suitable cavities too.

Blue Tits have been known to nest in holes in house walls, particularly where:

An old pipe has been removed
Mortar has deteriorated
Brickwork has crumbled
A small structural cavity has become accessible

Because Blue Tits are tiny, they can use openings that may look far too small to contain a nest.

How to identify a Blue Tit

Look for:

Blue crown
Blue wings
Yellow breast
White face
Dark stripe through the eye

Adults may make frequent feeding trips once their chicks hatch, often carrying caterpillars and other insects into the hole.

🐦 Great Tits

Great Tits can also use holes in house walls, although natural tree cavities and nest boxes are more typical.

They are noticeably larger than Blue Tits and therefore need a somewhat larger opening.

A Great Tit can be identified by its:

Black head
Large white cheeks
Yellow underparts
Black stripe running down the centre of the breast

If you see a black-and-yellow bird repeatedly flying into crumbling brickwork or an old pipe opening, check whether Great Tits are nesting there.

🌿 Wrens

The tiny Wren is famous for choosing unusual little nooks and crannies.

Wrens may nest among:

Walls
Banks
Climbing plants
Tree roots
Wood piles
Outbuildings
Sheltered crevices

Male Wrens actually construct several possible nests, after which the female chooses one to finish and use.

Because of their tiny size, Wrens can take advantage of surprisingly modest openings.

How to identify a Wren

Wrens are very small brown birds with:

Short rounded wings
Fine bills
Pale eyebrows
Very short tails that are often held upright

Despite their size, they have an exceptionally powerful song.

A tiny brown bird repeatedly slipping into a low crack in a wall could easily be a Wren.

🖤 Jackdaws

If the opening is much larger, consider a Jackdaw.

Jackdaws belong to the crow family and are far too large to squeeze through the tiny holes used by tits and sparrows.

However, they frequently nest in buildings.

Typical sites include:

Chimneys
Churches
Outbuildings
Old buildings
Large cavities
Tree holes

Jackdaws are particularly associated with chimneys.

How to identify a Jackdaw

A Jackdaw is smaller than a Carrion Crow and has:

Mostly black plumage
A silvery-grey back to the head
Striking pale eyes
A distinctive chack call

Jackdaw chicks can also be extremely noisy when being fed.

If loud calls are coming from a chimney or a large cavity high in an old building, Jackdaws are a possibility.

🐦 Feral Pigeons

Feral Pigeons generally need much larger openings than most cavity-nesting garden birds.

However, where roof damage provides enough access, pigeons may enter buildings and establish nests in sheltered internal spaces.

They are more likely to use:

Large roof openings
Abandoned buildings
Roof spaces
Ledges
Warehouses
Large cavities

A typical intact cavity wall is unlikely to contain a pigeon, but a damaged roof or large structural opening might.

Their comparatively heavy footsteps and wingbeats are also much louder than the movements of a Blue Tit or House Sparrow.

🏠 What About House Martins?

House Martins deserve a special mention because they are strongly associated with UK houses.

However, they normally nest on the outside rather than inside holes in the wall.

House Martins construct distinctive cup-shaped nests made from mud, usually positioned high beneath eaves.

If you can see an enclosed mud structure attached to the outside of the house, the birds are probably House Martins rather than birds nesting inside the wall.

📏 How Small a Hole Can a Bird Nest In?

Some British birds require astonishingly little space to enter a nesting cavity.

Nest-box recommendations give a useful indication of the sizes these birds can use.

Typical entrance sizes are approximately:

Species	Typical Nest-Box Entrance
Blue Tit	25 mm
Great Tit	About 28 mm
House Sparrow	About 32 mm
Starling	About 45 mm
Swift	Narrow horizontal opening

These measurements are intended for properly designed nest boxes rather than as specifications for holes in buildings, but they demonstrate just how small an opening can be attractive to a nesting bird.

Never assume that a hole is too small to contain birds simply because you cannot see inside it.

🧱 Where Do Birds Get Into Cavity Walls?

Older properties often contain numerous potential access points.

Look for:

Crumbling mortar
Missing bricks
Damaged pointing
Openings left by old pipes
Holes around cables
Loose roof tiles
Missing soffit sections
Gaps beneath fascia boards
Openings beneath eaves
Broken vents
Gaps around extensions

The visible entrance may lead into a much larger protected void.

From a bird’s perspective, this can resemble a natural tree cavity.

🔊 What Do Birds in a Wall Sound Like?

Sounds can provide useful clues.

Chirping or peeping

High-pitched peeping often means chicks have hatched.

Young birds may suddenly become noisy whenever an adult approaches with food.

Scratching

Light scratching may result from an adult moving around the nest or rearranging nesting material.

Fluttering

Birds entering and leaving a tight cavity can produce brief but surprisingly loud bursts of fluttering.

Heavy movement

Starlings, Jackdaws and pigeons can create considerably more substantial sounds than tits or sparrows.

Calls from outside

Sometimes the easiest clue comes from outside the house. House Sparrows cheep repeatedly, Starlings produce varied whistles and rattles, Wrens have extremely loud songs, and Swifts give piercing screams as they race around rooftops.

⏰ When Are Birds in Walls Most Active?

Birds are primarily active during daylight.

You might hear the most activity:

Around sunrise
Throughout the morning
When parents return with food
During late afternoon feeding visits

Once nestlings hatch, adults can make frequent journeys to and from the nest throughout the day.

If scratching occurs almost entirely in the middle of the night, another animal may be responsible.

🦇 Could It Be Bats Instead?

Possibly.

Bats also use buildings in the UK and can occupy:

Roof spaces
Wall cavities
Gaps beneath tiles
Openings behind fascia boards
Tiny exterior crevices

If you cannot actually see birds entering the opening, don’t assume that every noise inside a wall comes from a bird.

Bats have particularly strong legal protections in the UK, including protection of their roosts.

If you suspect bats, seek specialist advice before blocking or altering the entrance.

👶 Why Have Birds Suddenly Become Noisy?

A nest may be present for quite some time before the homeowner notices anything.

Nest building and incubation can be fairly quiet.

Then the eggs hatch.

Hungry chicks may start begging loudly whenever a parent arrives, making a previously silent wall suddenly sound busy.

You might notice a repeated pattern:

The wall is quiet.
An adult flies toward the house.
The chicks suddenly start calling.
You hear movement or fluttering.
Everything becomes quiet again.

Watching the outside of the house can confirm what is happening.

👀 How to Find the Nest Entrance

Rather than opening the wall, first observe the building from outside.

Look around the area where the sounds are loudest.

Check:

Roof edges
Eaves
Soffits
Fascia boards
Brickwork
Pipe openings
Guttering
Roof tiles
Vents

Then stand well back and watch.

Nesting adults may arrive carrying insects or other food.

If a bird repeatedly enters exactly the same hole, you have probably located the nest.

⚖️ Are Birds Nesting in Walls Protected in the UK?

Yes. Wild birds and active nests have legal protection throughout the UK, although the specific legislation differs between Great Britain and Northern Ireland.

In England, Scotland and Wales, the Wildlife and Countryside Act 1981 provides the principal protection for wild birds and nests. In general, it is an offence to intentionally take, damage or destroy the nest of a wild bird while it is being built or used.

Northern Ireland has its own wildlife legislation, principally the Wildlife (Northern Ireland) Order 1985, as amended.

This means discovering a nest inside your house does not automatically give you the right to remove it.

If there are eggs or chicks present, or adults are actively building or using the nest, get appropriate advice before carrying out work that could damage or block it.

🚫 Don’t Seal an Active Nest Hole

This is particularly important.

If you see the adult bird fly away, do not assume the hole is empty.

The bird may simply be gathering food while:

Eggs remain inside
The other parent incubates
Newly hatched chicks wait in the nest

Blocking the entrance can trap birds inside or prevent parents from reaching their young.

In many ordinary situations, the best option is to wait for the nesting attempt to finish before carrying out repairs.

🛠️ What Should You Do After the Birds Leave?

Once you have confirmed that the nest is no longer active and any relevant legal requirements have been addressed, you can investigate why birds gained access.

Depending on the location, repairs might involve:

Repointing damaged brickwork
Repairing soffits
Fixing fascia boards
Replacing damaged roof tiles
Closing old pipe openings
Repairing gaps around utility penetrations
Correctly screening suitable vents

Do not simply cover every hole without knowing its purpose.

Some openings in buildings are required for ventilation or drainage, and houses may also contain legally protected bat roosts.

If in doubt, use a qualified professional.

🪺 Consider Replacing Lost Nesting Space

Modern renovations often make houses more energy efficient and weatherproof—but they can also remove the tiny cavities traditionally used by birds.

If you need to permanently close a bird nesting hole after the breeding season, you may be able to provide an alternative nearby.

Depending on the species, possibilities include:

House Sparrow nest boxes
Starling boxes
Tit boxes
Swift boxes
Integrated Swift bricks

Swift bricks are particularly interesting because they can be built directly into suitable walls during construction or renovation.

Providing purpose-designed nesting sites can allow birds to continue breeding around your property without entering unwanted areas.

❓ Frequently Asked Questions

What birds commonly nest in holes in UK house walls?

House Sparrows and Starlings are among the most common. Swifts frequently nest in small gaps high in buildings, while Blue Tits, Great Tits and Wrens can occasionally use wall cavities and other structural holes.

What small bird is nesting in a hole in my wall?

If it is brown and constantly cheeping, it may be a House Sparrow. A tiny blue-and-yellow bird could be a Blue Tit, while a very small plain brown bird with an upright tail could be a Wren.

What black bird nests in holes in UK houses?

A glossy blackish bird with a pointed yellow bill may be a Starling. A much larger black bird with grey on the back of its head and pale eyes could be a Jackdaw.

Do House Sparrows nest in walls?

Yes. House Sparrows regularly nest in holes and crevices in buildings and are among the most likely British birds to use spaces around walls and roofs.

Do Starlings nest in walls?

Yes. Starlings frequently use cavities in buildings, particularly openings associated with roofs, eaves and larger structural gaps.

Do Blue Tits nest in house walls?

Occasionally. Blue Tits usually use tree holes and nest boxes, but they can use holes in walls, including openings created when pipes are removed or where brickwork has deteriorated.

Do Great Tits nest in walls?

They can. Great Tits are cavity nesters and occasionally use suitable holes in buildings.

Do Wrens nest in walls?

Yes. Wrens may build nests in nooks and crannies in walls as well as trees, banks and climbing vegetation.

Do Swifts nest inside walls?

Yes. Swifts regularly use small cavities in buildings, including gaps beneath roof tiles, eaves, soffits and openings in walls.

What bird flies straight into a tiny hole beneath the roof?

If it is a dark, sickle-winged bird arriving at high speed, it may be a Swift. Swifts can enter remarkably small openings beneath roofs and eaves.

What birds nest in chimneys in the UK?

Jackdaws are particularly well known for nesting in chimneys. Other birds may occasionally enter them as well.

Can I remove a bird nest from my wall?

Do not remove or block an active nest. Wild birds and their active nests are protected by UK wildlife legislation. Wait until the nest is genuinely no longer in use and seek professional advice if there is any uncertainty.

Can I block the hole after the chicks leave?

Once you are certain the nesting attempt has finished and the site is legally safe to work on, you can consider repairing unwanted access. Check first for additional birds, another brood, bats and any ventilation requirements.

Will the birds come back next year?

They might. House Sparrows, Starlings and especially Swifts may return to successful nesting locations.

For that reason, decide what you intend to do with the opening well before the next breeding season.

🐦 Final Thoughts

Britain’s houses provide nesting sites for more birds than many people realise.

House Sparrows and Starlings are among the most likely birds to occupy holes and cavities in UK homes, while Swifts are particularly dependent on small openings high beneath roofs and eaves. Blue Tits, Great Tits and Wrens can also occasionally choose holes in walls, and larger openings may attract Jackdaws or Feral Pigeons.

If you discover a bird entering your wall, identification is the best first step.

Watch the opening from a distance and look at the bird’s size, colour, behaviour and calls. If adults are repeatedly carrying food inside, there are almost certainly chicks in the cavity.

Most importantly, don’t immediately seal an active entrance. Once the nesting season has finished, you can assess the building, make appropriate repairs and—where possible—provide a purpose-built nest box or nesting brick so the birds still have somewhere safe to raise their young.