Roof Cleaning, Nesting Birds and Bats: Timing It Right

Wild birds are protected by the Wildlife and Countryside Act 1981. Section 1(1) is aimed at deliberate acts: a person who intentionally destroys, damages or takes a nest commits an offence while the nest holds birds or is under construction. The word intentionally matters. The offence concerns knowing action against an active nest, and it is not a rule against the ordinary upkeep of a house.

That wording leaves a plain rule for roofers. If we know a nest is active, we leave it. GOV.UK's wild bird guidance adds that no licence exists to allow development or construction, so nobody can apply for permission to clear an active nest simply to suit a building schedule.

Does that mean you cannot clean the roof while birds are about?

It means you plan around active nests. A finished, empty nest is a different matter from one with eggs or chicks, and binoculars from the ground usually settle which it is. If birds are going in and out of a gap under the tiles or behind the fascia, we leave that area alone and come back when they have gone.

We do not set calendar dates for this. Birds do not follow the calendar neatly, and the law asks whether a nest is occupied or under construction, and the month does not decide it. That is why the check is made on the day of the work, and again if the job runs over several visits.

Gulls and pigeons that roost on a ridge do not count as a reason to delay, but a nest on a ledge or in a gap does.

Bats get stronger protection than most wildlife. GOV.UK treats every bat species as fully protected, together with their breeding and resting sites. Its guidance names roof repairs and replacement as jobs that may disturb them. Cleaning that involves lifting or disturbing the covering falls in the same territory.

Two sets of rules apply. The Habitats Regulations 2017, at regulation 43(1), make it an offence to disturb bats deliberately, and also to damage or destroy a place where they breed or rest. The second part carries no word about intent, so harm to a roost can be an offence even when nobody meant it. Separately, section 9(4) of the 1981 Act is broken by a person who disturbs a bat in its shelter, or blocks the way in, either intentionally or recklessly.

Where do bats hide on a house?

• Under ridge tiles and between tile courses.
• Behind hanging tiles and weatherboarding on gable ends.
• In gaps behind fascia boards, soffits and barge boards.
• In the roof void, along the ridge board and on the gable walls.
• Around chimneys, where lead or mortar has left a small opening.

A roost can be occupied at different times of the year, so a clear roof today is not proof of a clear roof next month. Our page on bats behind fascia boards covers the eaves side in more detail.

Bats are small and can fit through a gap barely wider than a finger, so a hole you would call too tight for anything may be a front door.

You do not need a specialist to notice the clues. Many show from the garden or the loft, and they take a few minutes to check before any roof work is agreed.

What should you look for?

For birds, watch the eaves and the gaps around the roof for ten minutes in the morning. Birds carrying beakfuls of grass or feathers to the same spot are building. Chicks make a noisy, repetitive chatter once they hatch. Droppings and straw on a window sill or the top of a wall point to a nest above.

• Birds flying in and out of a gap under tiles or behind fascias.
• Straw, twigs or feathers poking from a gap.
• Swallow or martin nests tucked under the eaves.
• White streaks of droppings down a wall.

For bats, the signs are subtler. Droppings are small, dark and crumbly, and they collect under the entrance or on the loft floor. Fresh ones suggest recent use. Stains around an entry gap, where oily fur has rubbed against the tile, are another clue. Occasionally a bat is seen at dusk leaving the roof edge.

If you notice any of these, mention it before the survey. Take a photograph of the spot and leave it undisturbed. Knowing in advance means the visit can be planned properly, and nobody ends up opening a roost by accident. The notes we make at the survey record anything of this kind alongside the usual photographs of your own roof.

Looking first is the heart of it. Before anything is touched, we examine the eaves, ridge, verges and gaps, and we ask what you have noticed. A roof with birds nesting in the soffits, or a bat sighting last summer, changes the plan.

For birds, the plan is to leave active nests alone, work on other parts of the roof, and return to the rest once the nest is no longer in use. This costs a little time, so the arrangement is agreed with you before work begins, with the price in writing after the survey.

What do we do if bats might be present?

We do not lift tiles or strip the eaves where a roost is suspected. The normal route is to pause that part of the job and take advice from a bat professional, who can assess the roof and say what, if anything, may go ahead. Work can still go ahead on other parts of the building.

Removing moss by hand, the gentle method we favour, suits this situation because it avoids lifting tiles. Brushing a mat off the face of a tile is far less likely to disturb a roost than stripping and re-laying a slope. Ladders and equipment are kept clear of entry points, and gaps are never blocked while an animal might be inside.

If we come across a bat during the work, we stop, cover the area, and ask for advice before going on. Handling a bat without training is unsafe for you and for the bat.

Bats and birds are also a reason to avoid forceful cleaning near the eaves. Water jets and loud machines drive animals out and can break a nest, and a gentle method gives nothing to regret afterwards.

The edge where the roof meets the wall is where cleaning and wildlife meet most often. Clearing the gutter, scraping the lowest courses and working on the fascia boards all happen there, and so do many nests and roosts.

The eaves are a tight space. A fascia is the upright board at the roof edge, and the gutter is fixed to it. The soffit is the flat board beneath the overhang, closing the gap between wall and roof. Birds and bats use the cavity behind both. Pulling a board away, or packing the gap with foam or mesh, can trap an animal or destroy a nest.

Can gutters be cleared with birds nesting nearby?

Usually, yes, as long as the nest is not in the gutter and nothing disturbs it. Starlings and others sometimes nest at the end of a gutter or on top of a wall plate. If that is the case we work around it. Where a nest sits in the channel itself, we leave that stretch and come back.

The same care applies to moss debris. Material cleared from a nesting area can contain feathers, eggs or droppings, so we look through what we collect before bagging it. Our guide to moss in gutters covers the clearing itself, which only starts once the wildlife check is done.

If you want the gap behind a fascia closed to keep birds out next year, that is best done when no animal is using it, and after you and the roofer have looked at the entry points together. Closing a gap with an animal still inside is the one thing to avoid.

Stay calm and keep your distance. A nest or a roost is not an emergency, and nothing needs doing today. The best response is to stop any work near it and photograph it from a safe spot.

Who should you ask for advice?

For a bat roost, take advice from a bat professional before any work that could touch the roof, the eaves or the loft where the bats are. GOV.UK publishes guidance on bats, including surveys and licences, and it is a sensible first read. For a nest, the law turns on whether the nest is in use, so the safest plan is to leave the spot alone until the birds have left and then arrange the work.

• Photograph the entry point and any droppings.
• Tell the roofer before the survey, and stop work near the spot.
• Do not block gaps, spray or poke into them.
• Do not move a bat. If one is on the ground, keep people and pets away and ask for advice.

Roof work seldom has to be abandoned. Other parts of the building can carry on while the sensitive area is left alone. A clear slope can be cleaned, the gutters can be tackled in stages, and the nest or roost can be dealt with later with proper advice.

We would sooner delay a section than harm an animal or break the law. If you are unsure about something you have seen, say so at the survey and we will go through it with you on site.