Clearing vegetation outside the breeding bird season

The breeding bird season runs from roughly March to August, and clearing vegetation outside it is good practice rather than a legal safe harbour. Section 1 of the Wildlife and Countryside Act 1981 makes it an offence to intentionally take, damage or destroy the nest of any wild bird while that nest is in use or being built, and that protection applies on the day the nest is in use, whatever the date. A woodpigeon nesting in January is protected. So the season is a planning tool for managing risk, and the pre-clearance check is what actually keeps you lawful.

The legal protection that applies to active nests

The offence attaches to the nest, not to the calendar. It is unlawful to intentionally kill, injure or take a wild bird, to intentionally take, damage or destroy a nest while it is in use or being built, and to take or destroy eggs.

Species listed in Schedule 1 carry additional protection, because it is also an offence to intentionally or recklessly disturb them while they are nest-building or have dependent young, or to disturb those young. Barn owls, kingfishers, and a number of others fall in that category, and their presence changes the risk profile of a site entirely.

Note the word intentionally for the general offence. A contractor who flails a hedge without looking may argue the damage was not intended, and that argument is weaker than people assume where the work was carried out in May with no check. Recklessness is enough for the Schedule 1 disturbance offences.

Two further regimes sit alongside. The Hedgerows Regulations 1997 require notification to the local planning authority before removing most countryside hedgerows, with a six week period for the authority to respond. And tree works may need consent where a Tree Preservation Order or a conservation area applies.

The conventional season and why it is not a safe harbour

Most ecological method statements use 1 March to 31 August, and that covers the great majority of nesting activity in England.

It does not cover all of it. Early nesters can be sitting in February in a mild spring. Pigeons and collared doves nest across much of the year. Some species produce late broods into September. And a site with a resident barn owl has an occupied nest site well outside the conventional window.

So the rule to work to is simple: clearance outside the season needs a check, and clearance inside the season needs a check and a plan. The season tells you how likely a problem is, not whether one exists.

Pre-clearance checks and who carries them out

A nesting bird check is a targeted inspection of the vegetation to be removed, carried out shortly before the work and recorded.

Timing matters more than duration. A check carried out a fortnight before clearance is worthless, because birds nest in days. Most method statements require the check within 48 hours of the works starting, and on a long clearance programme that means repeated checks as the work moves across the site.

Who does it depends on the risk. On a small garden hedge in November, a competent site manager following a written method statement is usually proportionate. On a site with scrub, mature hedgerow or trees, inside the season, the check should be carried out by a suitably experienced ecologist, and on sites where Schedule 1 species may be present it has to be.

Where the wider ecology position is being established anyway, fold the requirement into the brief. A Preliminary Ecological Appraisal will identify the habitats where nesting is likely and should recommend the check regime, and where protected species are in play a Protected Species Survey is work for a suitably licensed ecologist in law rather than a document any software can complete.

Clearance methods that reduce risk

The method is as important as the timing, and a phased approach lowers risk substantially.

1. Cut vegetation to a height of around 200 to 300 millimetres first, leaving stumps and root systems, which removes nesting cover without disturbing ground beneath.
2. Leave the cut material in place for a short period so that any displaced wildlife can move out, then remove it.
3. Grub out roots in a separate operation, working in one direction so that animals move towards retained habitat.
4. Use hand tools where vegetation abuts retained features, and keep machinery away from hedgerow bases.
5. Fell trees in sections with a visual inspection of each cavity before cutting, and never in a single drop where features are present.

Direction of working is the detail most often omitted and the easiest to get right. Clearing from the centre of a site outwards pushes wildlife into retained edges rather than cornering it.

Avoid the temptation to clear a site early to simplify matters. Where habitat has been degraded by activity after 30 January 2020 without planning permission, the biodiversity gain baseline reverts to the pre-degradation value, so clearing scrub in advance of an application raises the gain requirement rather than lowering it.

Conditions requiring a method statement

Authorities routinely condition a method statement rather than a date restriction, and the condition is usually tied to the start of works on site.

Expect wording requiring a construction environmental management plan, or an ecological method statement, to be submitted and approved before any vegetation clearance, with the works then carried out in accordance with the approved document. Some conditions require supervision by an ecological clerk of works at specified stages.

These are pre-start conditions and they take time to discharge. A method statement submitted in late February for a March start will not be approved in time, and the discipline needed is the one described in discharging pre-start conditions in time for a spring start. The same document often carries the clearance method, the dust and mud control and the working hours, which is why a Construction Management Plan is worth drafting as one piece rather than three.

What to do when a nest is found mid clearance

Stop that part of the work. Not the whole site, that part.

Mark an exclusion buffer around the nest, sized to the species and the disturbance involved, and record its location. Typical buffers for common species are a few metres for a hedgerow nest and considerably more for a raptor, and an ecologist should set the figure rather than the site manager.

Then leave it. The nest is protected while it is in use, so work resumes once the young have fledged and an ecologist has confirmed the nest is no longer in use. Record the date of the finding, the species if known, the buffer applied, the date of the confirmation and the date work resumed. That record is your evidence of compliance if anyone asks later.

Do not move a nest. Relocating an active nest is not a mitigation measure, it is the offence.

Programming clearance into a build sequence

Put clearance in the programme as a September to February activity wherever the sequence allows, and treat it as a separate early package rather than something the groundworks contractor does on day one.

Three things make that work. Discharge the method statement condition in the autumn, not the spring. Give the clearance contractor a written method statement rather than a verbal instruction. And allow a window in the programme for a nest to be found, because on a site with mature hedgerow it will happen eventually.

Where the ground investigation also needs doing, the same winter window suits both, and the trade-offs are set out in winter ground investigation and what the season changes. Doing the two together saves a mobilisation and keeps the critical path shorter.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.

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