When you may clean a nest box

Old nest material can be full of parasites, which is why people want to empty a box. The limit is that a nest in use is protected. The dates below are from the BTO’s putting-up page. The offence is from the England and Wales text of section 1 of the Wildlife and Countryside Act 1981, opened on 14 November 2026. That page says this version of the section extends to England and Wales. Scotland has a separate version. This guide has not opened the Wildlife (Northern Ireland) Order 1985 and does not describe Northern Irish law.

What the Act says, in the England and Wales text

Section 1(1) makes it an offence if a person intentionally:

• kills, injures or takes any wild bird;
• takes, damages or destroys the nest of any wild bird while that nest is in use or being built;
• takes or destroys an egg of any wild bird.

There is a further offence, in section 1(5), of intentionally or recklessly disturbing a wild bird included in Schedule 1 while it is building a nest or is in, on or near a nest containing eggs or young, or disturbing the dependent young of such a bird.

A blue tit or a robin is not, by that extra paragraph, a Schedule 1 species. The nest offence in section 1(1) still applies to them: you do not damage or destroy a nest that is being built or is in use. Opening a box, lifting out a live nest, or “just having a look” that keeps a bird off eggs is the sort of disturbance the BTO’s own monitoring code exists to avoid. We have not reproduced that code. If you want to record nests, use the BTO’s Nest Record Scheme and its code of conduct rather than this page.

“Intentionally” is the word in section 1(1). This page is not a lawyer’s reading of accidents. If you are unsure whether a box is still in use, leave it.

The months the BTO gives

The BTO says that when the breeding season is over, old nests can be removed and the box cleaned out, and that bird protection law permits cleaning between 1 September and 31 January. Any dead eggs must be destroyed promptly and cannot be kept or sold.

They add a practical warning: some hole-nesting species, including sparrows, may have second or third broods in the same nest. Those nests should be left until sometime in the autumn, when you are sure they are no longer in use. A box that still has birds going in and out in September is not a candidate for a clean, even though the calendar window has opened.

The make-a-box page says a hinged roof is what makes this possible without wrecking the box. Clean after you are sure it is empty. We did not open a page that specifies a disinfectant for nest boxes, so none is named here. Feeder bleach advice does not automatically transfer.

Cameras

A camera inside a box is still a box with a nest. The same “in use or being built” line applies. Do not open the box to adjust a camera once birds are building. The camera guide is about the equipment, not about a right to disturb.

Putting the box back into service

After a clean inside the September-to-January window, the box can stay up. The BTO says birds roost in boxes in winter, and that pairs start prospecting in the latter half of February. Cleaning in February because the box “looks quiet” is outside the window they give. See the nest box guide for siting.

Can I clean a box in March if it was not used?

March is outside 1 September to 31 January. If you are certain there is no nest being built, the offence is aimed at nests in use or being built, but the BTO still points people at that window. If there is any lining, moss or birds investigating, leave it until the following autumn.

Can I keep a deserted egg?

The BTO says any dead eggs must be destroyed promptly and cannot be kept or sold. The Act also makes it an offence to take or destroy an egg, with defences we have not set out. Do not start an egg collection.

Does this apply in Scotland?

The quotation is the England and Wales text. Use the Scottish version of the Act before you rely on it there. Northern Ireland is a different order, and this guide does not summarise it.