Nesting birds: the season, the offence and the conditions

Between March and August, clearing vegetation or demolishing a building without checking for active nests risks committing a criminal offence under section 1 of the Wildlife and Countryside Act 1981. There is no development exemption and no licence available for the convenience of a programme. That single fact drives the standard condition councils attach to almost every scheme involving hedgerows, scrub, trees or old buildings, and it is the reason clearance work so often happens in a rush in late February.

The offence and who commits it

Section 1 of the 1981 Act makes it an offence to intentionally kill, injure or take any wild bird, to take, damage or destroy the nest of a wild bird while that nest is in use or being built, and to take or destroy its eggs. The protection covers all wild birds, not a special list.

Intent is the qualifier that people misunderstand. A contractor who flails a hedge in June, having been told there are nests in it, is on the wrong side of the line. So, in practice, is one who did not look when looking was obviously required, because the courts consider what a reasonable person would have foreseen. The machine driver commits the offence. Depending on the instructions given, the site manager and the company can be implicated too.

The consequences are not limited to prosecution. A council that discovers habitat cleared before determination will treat that as a material consideration, and pre-emptive clearance also strips out the baseline habitat your Biodiversity Net Gain Assessment has to measure against.

The main breeding season and its edges

The season usually quoted is 1 March to 31 August. Treat those dates as a working assumption rather than a rule, because the Act protects nests whenever they are active, not during a defined window.

Early nesters are the trap. Long-tailed tits and blackbirds can be sitting in February in a mild year, and pigeons breed almost throughout. At the other end, swifts are often still feeding young in mid-August, and second or third broods extend into September. A clearance programmed for 1 September because the calendar says the season is over is still a programme that needs a check.

Where the works are in the season, the standard answer is an inspection by a competent ecologist immediately before clearance, usually within 48 hours, with any active nest left with a buffer until the young have fledged. Build that into the programme, because a nest found on the day stops that section of work for two or three weeks.

Vegetation clearance timing and supervision

The least costly strategy is to clear outside the season. That means finishing hedgerow, scrub and ground vegetation removal by the end of February, or starting in September, and it means making the decision early enough that the ecologist is instructed before the machines are booked.

Where that cannot happen, the sequence is:

1. A pre-clearance inspection of the vegetation to be removed, by someone competent to find nests rather than by the foreman.
2. Marking and fencing any active nest with a buffer appropriate to the species and the disturbance.
3. Clearance of the remainder under supervision, working away from retained habitat rather than towards it.
4. A repeat inspection if there is a gap of more than a couple of days before the machines arrive.
5. A written record of each inspection, with dates, names and findings.

Cutting vegetation down to a short sward in advance, before the season starts, is a legitimate way of discouraging nesting on land due to be cleared later, provided it is done when no nests are active. It is not a way of removing birds already present.

Schedule 1 species and the extra protection

Some species carry an additional layer. Birds listed on Schedule 1 to the Act are protected against intentional or reckless disturbance while building a nest, or while at a nest containing eggs or young, and against disturbance of their dependent young.

That matters because disturbance does not require touching the nest. Working noisily within sight of a nesting Schedule 1 bird can be an offence in itself. Barn owl, kingfisher, peregrine, little ringed plover, black redstart on brownfield sites, and several others appear regularly in development casework. Where a Schedule 1 species is suspected, the ecologist's advice becomes a licensing question rather than a timing one, and survey work near the nest itself needs a licence.

A Preliminary Ecological Appraisal should flag the possibility at the outset, and a targeted Protected Species Survey follows where the habitat supports it. Both need a suitably experienced and, where relevant, licensed ecologist. An AI-drafted report is a structure for that professional to complete, never a substitute for the survey.

Buildings, scaffolding and swift nests

Nests turn up in buildings as often as in hedges. House martins under eaves, swallows in outbuildings, swifts in gaps under roof tiles and behind soffits, and starlings and house sparrows in cavities are all frequently found on refurbishment and conversion projects.

Swifts are the awkward case. They return to the same nest site year after year, they arrive in late April or early May and leave by mid-August, and the entrance may be a gap of a few centimetres that nobody notices until the scaffolding goes up. Re-roofing a terrace in June without checking is a real risk.

Scaffolding itself attracts nesting, particularly if it stands for months with debris netting. Inspect before each phase, and where a nest establishes on the scaffold, expect to leave that bay alone.

Replacement provision is increasingly conditioned. Integrated swift bricks, sparrow terraces and martin cups built into the new fabric cost little at construction stage and count towards the habitat and design benefits the council is looking for.

How councils word the standard condition

The typical wording prohibits removal of vegetation, hedgerows, trees or buildings during the bird nesting season unless a competent ecologist has inspected the area immediately beforehand and confirmed in writing that no active nests are present, with a copy provided to the council.

Read the wording carefully, because variations bite. Some conditions fix the dates rather than referring to the season, which leaves you exposed for a February nest. Some require the ecologist's report to be submitted and approved rather than simply provided, which adds time. Some extend to demolition and scaffolding as well as vegetation. If the wording is unworkable, raise it during the application rather than applying to vary it later.

What to do when a nest is found mid-works

Stop work in that area. Do not move the nest, and do not attempt to make the site unattractive to the adults, because both can amount to the offence.

Establish a buffer on the advice of the ecologist, mark it physically so no machine strays into it, and record the date. Monitor at a distance until the young have fledged and the nest is no longer in use, then confirm in writing before resuming. Tell the council if a condition requires it. Keep the record either way, because the question tends to be asked months later when someone reviews the discharge of conditions.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified ecologist before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Enter your postcode on PlanScope to see which ecology reports your site is likely to need.