Can you remove a nest from my roof?

Not while it is active — that is an offence. We survey the site, confirm the position legally, and either proof immediately or plan the work for the moment the nest is no longer in use.

What is the most effective long-term fix?

Proofing. Netting, wire posts, spikes or physical repair to eaves and tiles removes the roosting and nesting opportunity, which is what actually stops birds returning.

Do you clean up the fouling?

Yes. Fouling and redundant nest material are cleared and disinfected under controlled conditions, then documented.

Why have I got insects after the birds left?

Abandoned nests are a well-known source of bird mite, carpet beetle and flies. We treat the nest source as well as the rooms affected.

Do you work on commercial buildings?

Yes — flat roofs, plant areas, signage, loading bays and food premises are a large part of our bird proofing work across Hertfordshire.

HPE Species Library

Pest birds

Columba livia domestica and associated species

Feral pigeons, gulls, starlings and sparrows nesting and roosting on buildings — the fouling, blocked gutters and insect carry-over matter more than the birds themselves.

01727 601 007 Identify my pest

Quick facts

Main species: Feral pigeon
Nesting season: March to August
Legal status: Protected — proofing led
Primary fix: Netting and proofing

Also known as: Feral pigeons, Gulls, Starlings, House sparrows

Species at a glance

Moderate risk

Scientific name: Columba livia domestica and associated species
Alternative names: Feral pigeons, Gulls, Starlings, House sparrows
Average size: 30–35cm (feral pigeon); gulls considerably larger
Average weight: 250–400g (feral pigeon)
Activity: Diurnal
Diet: Opportunistic. Spilled grain and food waste, discarded street food, commercial waste, and deliberate feeding by the public.
Typical habitat: Ledges, parapets, open eaves, roof voids and flat commercial roofs
Active season: Nesting March to August, roosting year-round

Why the moderate risk rating: Fouling, blocked gutters, slip hazards and secondary insect infestation from nests.

About the pest birds

Pest bird work in Hertfordshire is almost always a building problem rather than a wildlife problem. Feral pigeons roost on ledges, in open eaves and inside unproofed roof spaces; starlings and sparrows nest under tiles and in soffit gaps; gulls nest on flat roofs of commercial and industrial units. The consequences are fouling on frontages and walkways, blocked gutters and hoppers, damaged insulation, and secondary insect infestations — carpet beetle, bird mite and fly larvae — carried by nests. All wild birds, their nests and eggs are protected under the Wildlife and Countryside Act 1981, so lawful work is proofing-led, and any control is only ever considered under the strict terms of the relevant general licence.

Diet: Opportunistic. Spilled grain and food waste, discarded street food, commercial waste, and deliberate feeding by the public.
Breeding: Feral pigeons can raise several broods a year where food and shelter allow. Gulls, starlings and sparrows are largely single-season nesters between March and August.
Lifespan: Typically 3–5 years for feral pigeons in an urban setting; gulls considerably longer.

How to identify it

Feral pigeon: 30–35cm, grey with two dark wing bars and an iridescent neck
Herring and lesser black-backed gulls: large, loud, nesting on flat roofs from April
Starling: glossy dark plumage with pale speckling, noisy communal roosts
House sparrow: small, brown and grey, nesting in soffit and eaves gaps

Signs, behaviour and where they live

Signs of activity

Fouling on ledges, frontages, walkways and vehicles below a roost
Nesting material in gutters, hoppers and behind signage
Persistent scratching, cooing or chick noise in a roof space
Feathers, down and insect activity in loft insulation
Blocked downpipes and overflowing gutters after rain

Behaviour

Strongly site-faithful — birds return to the same ledge or void year after year
Nesting and fledging run from early spring to late summer
Feral pigeons breed repeatedly through the year where food is reliable
Roosting pressure on buildings continues right through the winter

Where you'll find them

Ledges, parapets, canopies and signage on town-centre buildings
Open eaves, broken tiles and unproofed roof voids
Flat commercial and industrial roofs, plant areas and gutters
Loading bays, waste compounds and food-premises yards

Seasonal activity in Hertfordshire

Twelve-month activity profile for pest birds, based on our Hertfordshire call-out records.

LowModerateRisingHigh

January: Moderate activity
Jan
February: Moderate activity
Feb
March: Rising activity
Mar
April: High activity
Apr
May: High activity
May
June: High activity
Jun
July: High activity
Jul
August: Rising activity
Aug
September: Moderate activity
Sep
October: Moderate activity
Oct
November: Moderate activity
Nov
December: Moderate activity
Dec

Peak period: March to August
Right now: Rising activity in August

Nesting and fledging drive most complaints between early spring and late summer. Proofing is best carried out outside the nesting season, once a roof space or ledge is confirmed clear.

Hertfordshire Pest WatchDeclining

Birds are usually becoming less noticeable as the season turns. Nesting and fledging drive most complaints between early spring and late summer. Proofing is best carried out outside the nesting season, once a roof space or ledge is confirmed clear.

Activity appears to be easing

Current local data is limited. The status shown is based primarily on established seasonal behaviour across Hertfordshire. Last reviewed 1 July 2026.

See all Hertfordshire Pest Watch activity

Why pest birds matter

Health risks

Fouling can carry organisms associated with respiratory and gastrointestinal illness
Dried droppings create a slip hazard on walkways, steps and fire escapes
Bird mites and insect pests migrate indoors when a nest is abandoned
Contamination risk in food premises, healthcare and education settings

Property damage

Blocked gutters, hoppers and downpipes leading to water ingress
Corrosive fouling on stonework, paintwork and roofing membranes
Displaced tiles and compacted, soiled loft insulation
Nest material in plant, flues and ventilation intakes

Hertfordshire context

Pest birds across Hertfordshire

Feral pigeon roosting concentrates on town-centre parades and station buildings in Watford, Stevenage and Hemel Hempstead, while gull nesting is most often reported on flat commercial roofs on the county's industrial estates. Starling and sparrow nesting in open eaves is common across older village housing.

Setting the record straight

Common misconceptions

You can just remove the nest.

All wild birds, their active nests and eggs are protected by law. Nest removal is only lawful once the nest is no longer in use, or under the strict terms of a general licence.

Spikes solve everything.

Spikes suit narrow ledges. Wider ledges, roof voids and flat roofs usually need netting, wire posts or physical proofing instead.

The birds are the problem.

The building is. Open eaves, broken tiles and a reliable food source are what keep birds returning to the same address.

Once the birds go, it's finished.

Abandoned nests routinely leave bird mites, carpet beetle and fly larvae behind, which then move into the rooms below.

Prevention and professional treatment

How to prevent them

Check gutters, parapets and flat roofs for nesting material before spring
Proof open eaves, broken tiles, soffit gaps and vents so birds cannot get inside
Remove accessible food — spilled feed, open waste and public feeding points
Keep bins closed and waste compounds clean at commercial premises
Clear and disinfect fouling promptly so a roost does not become established

How we treat them

Survey to identify species, entry points and whether nesting is active
Legal assessment against the Wildlife and Countryside Act before any work
Proofing specification — netting, wire posts, spikes, mesh or tile repair
Controlled clearance and disinfection of fouling and redundant nest material
Treatment of secondary insect pests left behind by abandoned nests
Photographic records and a written service record on completion

Treatments for pest birds

Commercial pest control

Bird proofing, fouling clearance and documented site records.

View treatment

Insect control

Bird mite, carpet beetle and fly treatment following nest removal.

View treatment

Pest birds questions, answered

The questions our technicians are asked most often about pest birds in Hertfordshire.

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