Bats in the Roof: What Happens to a Re-roof?

Why bats change the plan

Bats and the places they roost are protected, even when the bats are not in residence. A roof void, a gap behind a fascia or a space under a ridge can be a roost, and it stays protected whether or not the bats are there at the time. Disturbing or damaging a roost without proper advice can have serious consequences, and the responsibility sits with the person doing or ordering the work. We do not go into the detail of the law here, and the advice is to take a specialist's view.

Bats are small and leave little sign. Droppings that crumble to dust, staining around an entry gap and the sound of squeaking at dusk are the usual clues. Older houses with old timber and gaps are more likely to have them, but modern houses can too, particularly near woodland, hedgerows or water.

This is not a reason to avoid the work, only to plan it carefully.

Roofing materials matter to bats. Old tiles, gaps under the ridge and soft timber give them access, and breathable membranes in newer roofs can be a hazard if they trap or tangle a bat. The specialist advises which type of underlay is suitable when a roost is present.

What to do if you find signs

Stop and do not disturb the area. Do not block gaps, clean out droppings with a brush or spray anything. Take photos of what you see, note where it is, and tell your roofer straight away. We stop work on that part of the roof and ask you to seek advice from a qualified bat specialist, who can survey the property and say what is needed.

The specialist will assess whether a roost exists and what species and numbers are involved, and they will explain what measures are needed. Surveys depend on the time of year, because bats are easiest to detect when they are active. This is why it helps to raise it at the planning stage, before a date is fixed.

Our survey includes a look for signs. If anything turns up, we report it exactly as seen, with no guesswork about what it means.

Do not rely on the absence of droppings as proof. Some roosts are used only at certain times of year, and a roof inspected in winter may show nothing. A specialist knows when and how to survey, and may suggest more than one visit.

How the re-roof can proceed

In many cases the work goes ahead with changes. It may be timed to avoid the periods when bats are most vulnerable, such as when they are raising young or hibernating. It may include features that keep access for bats, such as special tiles or bat boxes built into the new roof. Those details are for the specialist to set, and we build to their instructions.

Some works need a formal arrangement with the relevant authority, and a specialist guides you through it. It can add time, so plan ahead. Our pages on the roof replacement process and on what stripping a roof involves show where the pause points are.

Timing matters for other reasons too. Our answer on whether you can replace a roof in winter covers the weather side, which may interact with the bat advice.

Scaffolding can be erected in most cases while the advice is awaited, but we do not strip any covering near a suspected roost until we have the go-ahead. Protecting the building from the weather in the meantime is a matter we plan with you.

What it means for cost and schedule

Expect some delay and some extra cost: the specialist's survey and report, possible special tiles or fittings, and a start date that fits the season. We include these in the plan once we know what is required, and give a fixed written quote for our part of the work.

Nesting birds are protected too, and the same approach of stopping, advising and timing applies. Be honest with your roofer about anything you have seen, because early information saves money. For the wider picture, see the hub page on roof replacement and new roof installation.

Costs vary with what the specialist recommends, and we do not quote figures for that part. We tell you what is required and fit our own work around it.

If nothing is found, the re-roof proceeds as normal, with a note in your file that the checks were done. That record is worth keeping, since it shows you acted sensibly if questions arise later.