Bird and Animal Nest Removal from Chimneys: Wildlife and Countryside Act Restrictions and Safe Clearance

Summary

Wildlife law is one of the few areas of chimney sweeping where getting it wrong is not a civil matter — it is a criminal one. The Wildlife and Countryside Act 1981 protects all wild birds and their active nests from deliberate disturbance or destruction. A sweep who pulls a jackdaw or starling nest out of a flue while it contains eggs or chicks, even if unaware, can face prosecution. The defence of ignorance is weak in this context because the law is well-established and professional sweeps are expected to know it.

In practice, most sweeps encounter nests at predictable times of year. Jackdaws nest from April through June, starlings from April through July, and swifts from May through August. A sweep called in the spring or early summer to clear a blocked flue should check for active nesting before making any attempt to clear debris. The check does not need to be elaborate — listening at the fireplace opening, looking for active flight to and from the chimney pot, and examining any debris pulled down for signs of eggs or chicks is usually sufficient to establish whether nesting is underway.

Bats are a separate and even more stringent category. All UK bat species are European Protected Species under both the Conservation of Habitats and Species Regulations 2017 and the WCA. Disturbing a bat roost — even an unoccupied roost — is a criminal offence. A chimney that has had bats roosting is a protected roost even when the bats are absent in winter. If a sweep finds evidence of bats, work must stop immediately and Natural England (England), Natural Resources Wales, or NatureScot (Scotland) must be consulted before any further works.

Key Facts

• Wildlife and Countryside Act 1981 (WCA) is the primary legislation protecting wild birds in the UK; all species are protected while nesting — this is not limited to rare or Schedule 1 species
• Schedule 1 of the WCA lists species with the highest protection — disturbance of any Schedule 1 bird at or near the nest during breeding is a specific offence carrying higher penalties; swifts are Schedule 1
• Active nest = a nest containing eggs or young birds; once fledged and the nest is cold and unused, it is no longer legally protected as an active nest
• Jackdaw (Corvus monedula) — extremely common chimney nester; bulky stick nests can completely block a flue; nesting season approximately April–June
• Starling (Sturnus vulgaris) — nests in chimney cavities and pots; season approximately April–July
• Swift (Apus apus) — Schedule 1 protected; arrive UK May, depart August; nest in the same site year after year; any disturbance of the swift or its nest during the breeding season is a criminal offence
• House sparrow and house martin may also occasionally use chimney areas but are more typically associated with roof spaces and soffits
• Jackdaw nests can be enormous — up to 1 m deep of sticks, twigs, and debris; complete flue blockage is common; debris removal typically requires specialist rods and a very large collection sheet
• After season ends, a nest that is no longer active can be removed legally; however, always confirm the nest is cold and completely unoccupied before proceeding
• Squirrels (grey squirrel, Sciurus carolinensis) — not protected under the WCA, but the Animal Welfare Act 2006 applies; squirrels that have entered a chimney and are trapped alive must not be left to suffer; live-capture trapping or removal by pest control is the appropriate route
• Bats: all UK bat species are protected under the Conservation of Habitats and Species Regulations 2017 and the WCA; disturbing, injuring, or killing a bat or obstructing/destroying a roost is a criminal offence; penalty up to 6 months imprisonment and/or unlimited fine
• Unoccupied bat roost: a chimney that has been used as a bat roost remains legally protected as a roost even when bats are absent — do not seal or disturb without a licence from the relevant statutory nature conservation body
• Natural England Bat Helpline: 0345 1300 228 — first port of call if bats are found
• Cowls and bird guards are the most effective long-term prevention; fit after confirmed clearance of an empty, unoccupied flue

Quick Reference Table

Detailed Guidance

Checking for Active Nesting Before Any Sweep Work

Before inserting any rods, brushes, or vacuum equipment into a chimney, take two minutes to check for active nesting. This is not optional — it is a professional and legal requirement.

Listen at the fireplace opening with the damper open or register plate removed. Active nests with chicks produce audible calling sounds, especially when the parent bird visits. Even eggs produce soft sounds when disturbed.

Observe the chimney pot from outside for a few minutes. Jackdaws and starlings make regular flights to and from an active nest — you will see birds entering and leaving the pot. Swifts are unmistakable in flight (scythe-shaped wings, screaming call) and will repeatedly visit a chimney they are nesting in.

Examine any material that has already fallen into the firebox. Stick debris, feathers, grass, and mud lining material indicates a nest above. If you can see or feel eggs or small chicks in material you have already pulled down, stop immediately.

If there is any doubt about whether a nest is active, treat it as active. Do not proceed with the sweep.

What to Do When an Active Nest is Found

Stop all work immediately. Do not attempt to remove any nest material, clear the flue, or continue with the sweep.

Advise the customer clearly and professionally: explain that UK law protects wild bird nests while active, that this is a criminal matter and not a procedural technicality, and that work must wait until the nesting season for that species is confirmed to have ended.

Record the finding on your paperwork — note the date, the evidence of active nesting you observed, and the advice given to the customer. This protects you if the customer decides to act independently.

Give the customer a realistic timeline: jackdaws are typically done by early July; starlings by early August; swifts by September. Book a return visit. For swifts specifically, advise the customer that swift nesting sites are protected and that fitting a cowl or closing the pot after the birds depart is possible — but should be done with care, as swifts return to the same nest site year after year, and there are RSPB-approved swift-compatible chimney solutions if the customer wishes to maintain the nest site.

Swift-Specific Guidance

Swifts are Schedule 1 birds, which means disturbance at or near the nest while they are breeding carries a specific additional offence beyond the general Section 1 prohibition. The penalty for disturbing a Schedule 1 nest includes an unlimited fine and up to six months imprisonment.

Swifts are a declining species in the UK, and their chimney nest sites are considered particularly valuable. The RSPB and Swift Conservation work actively to protect known nest sites. If you find swifts nesting in a customer's chimney:

• Do not enter the flue from above or below while birds are present
• Do not fit any cowl, cap, or terminal device that would obstruct the chimney pot while birds are in residence
• Advise the customer that the chimney cannot be swept until after the birds depart — typically September
• Mention that the nest will be used again next year; the customer should consider this in their planning

Bat Roosts in Chimneys

Bats are the most seriously protected species a sweep may encounter. Unlike birds, bat roost protection is year-round — not just during the breeding season. A chimney that has been used as a bat roost cannot be sealed, blocked, modified, or disturbed at any time of year without a European Protected Species licence from the relevant statutory nature conservation body (Natural England, Natural Resources Wales, or NatureScot).

Signs of bat roosting in a chimney include: bat droppings (dark, crumbly, insect-fragment-filled — distinct from mouse droppings which are smooth), scratch marks around the pot or terminal, and bats observed entering or exiting at dusk.

If you find or suspect a bat roost:

1. Stop all work immediately
2. Do not seal or block the chimney
3. Contact the Natural England Bat Helpline (0345 1300 228) or the equivalent body for your region
4. Advise the customer that a licensed bat surveyor will need to be involved before any works proceed
5. Document the finding and advice on your paperwork

Do not attempt to remove bats yourself, cage them, or "encourage" them out. This is a criminal act regardless of intent.

Removing Nests After the Season Ends

Once a nest is confirmed cold and unoccupied, and the relevant nesting season is past, the debris can be removed. Jackdaw nests in particular are heavy and compacted — a full jackdaw nest can weigh several kilograms and occupy a significant portion of the flue. You will need:

• Heavy-duty dust sheets covering the entire hearth area and surrounding floor
• A large collection vessel (bin bags or rigid containers) positioned at the fireplace
• Extended rod sets to dislodge compacted stick debris from above if accessible
• A heavy-duty wet/dry vacuum capable of handling large debris volumes
• PPE: gloves, dust mask (bird droppings may contain Psittacosis-causing Chlamydia psittaci — treat all nest debris as potentially contaminated), eye protection

Work from below: use rods to loosen debris and allow it to fall into the collection vessel. For very deep nests, it may be necessary to clear the chimney in stages. Always confirm the flue is clear with a smoke test after removal.

After nest removal, recommend and fit an appropriate chimney cowl or bird guard to prevent reoccurrence. Discuss with the customer what type is most suitable given the appliance — see chimney pot and cowl types for cowl selection guidance.

Frequently Asked Questions

Can I remove a bird nest from a chimney if it looks abandoned?

Only if you are certain the nest is not active — that means no eggs, no chicks, and no evidence of recent adult bird activity (no fresh droppings, no flight activity observed). If in doubt, treat it as active and return later. The safest approach is to wait until the relevant nesting season has definitively passed for the species you have identified.

The customer wants me to clear the chimney now — what do I do if there's an active nest?

Politely but firmly refuse. Explain that proceeding would expose both you and potentially the customer to criminal liability under the Wildlife and Countryside Act 1981. This is not discretionary — the law does not provide an exemption for customer inconvenience or urgency. Offer to rebook for after the nesting season and give a specific return date. Document the refusal and the reason on your paperwork.

Are grey squirrels protected in the same way as birds?

No — grey squirrels are not protected under the WCA. However, the Animal Welfare Act 2006 requires that animals are not caused unnecessary suffering. If a squirrel is trapped in a chimney and still alive, you cannot simply block it in. Refer to a pest control company with appropriate qualifications for live-capture trapping or humane removal. Grey squirrels that are captured alive cannot legally be released — they are a non-native invasive species and must be humanely dispatched.

What if I accidentally disturb a bird nest before I notice it's active?

Stop work immediately. If you have already removed nest material containing eggs or chicks, this is a serious situation. Contact the RSPCA (0300 1234 999) for guidance on the chicks, and consider seeking legal advice if prosecution is a concern. Document everything honestly on your paperwork. Going forward, always check for nesting before starting a sweep during the spring and summer months.

Regulations & Standards

• Wildlife and Countryside Act 1981 — Section 1 (protection of birds and their nests/eggs), Schedule 1 (specially protected species including swift)

• Conservation of Habitats and Species Regulations 2017 (Habitats Regulations) — UK implementation of the EU Habitats Directive; protects all bat species as European Protected Species

• Animal Welfare Act 2006 — duty of care obligations for any live animal encountered during work

• Natural England licensing — European Protected Species licences for bat disturbance; required for any planned works affecting a bat roost

• RSPB guidance on swift conservation — best practice for protecting swift nest sites

• Natural England — Bats and the law: www.gov.uk/guidance/bats-protection-surveys-and-licences

• RSPB — Wild bird protection and the law: www.rspb.org.uk/birds-and-wildlife/advice/wildlife-and-the-law/wild-birds

• Swift Conservation — chimney nest site guidance: www.swift-conservation.org

• Natural England Bat Helpline: 0345 1300 228

• HSE — Psittacosis and ornithosis (bird droppings health risk): www.hse.gov.uk/biosafety/diseases/psittacosis.htm

• chimney pot and cowl types — Bird guard and cowl selection to prevent future nesting

• chimney sweep certificate — Documenting nest findings and advice on the sweep record

• flue inspection and testing — Full inspection procedure before and after nest removal