Nesting birds are the constraint most often tripped over on site rather than at the planning stage, usually by a contractor clearing a hedge in June with the best of intentions.
Farmland and hedgerow birds have declined sharply across these islands over the last half-century, and the causes are structural rather than deliberate: hedgerows removed or cut too hard and too often, field margins lost, mixed farming replaced by monoculture, and the insect populations that feed chicks in their first weeks much reduced.
A thick, well-managed hedgerow is one of the most productive habitats in the Northern Ireland countryside. It provides nesting cover, a food supply, a commuting corridor for birds, bats and small mammals, and shelter for the invertebrates the whole system runs on. The difference between a hedge cut every year and one on a three-year rotation is measurable in nests.
Retaining and enhancing hedgerows, treelines and scrub is often the cheapest and most effective biodiversity gain available on a rural site — and it is what councils increasingly want to see written into a scheme rather than added as an afterthought.
All wild birds, their nests and their eggs are protected under the Wildlife (Northern Ireland) Order 1985 as amended while the nest is in use or being built. Some species receive additional protection. It is an offence to intentionally or recklessly damage or destroy an active nest, which in practice is what makes the timing of vegetation clearance a legal matter rather than a courtesy.
The nesting season is conventionally taken as March to August inclusive, though it can start earlier and run later depending on the species and the season. The practical implication is straightforward: hedgerow, scrub and tree removal is best programmed for September to February.
Where clearance has to happen within the season, it needs a check by an ecologist immediately beforehand, and work stops if an active nest is found until the young have fledged. Buildings due for demolition also need checking — swallows, house martins, swifts and barn owls all use farm buildings.
Conventionally March to August inclusive. Some species nest outside those months, so the dates are a guide rather than a guarantee, and a pre-clearance check is the safe approach near the margins.
Only after a check by an ecologist confirms there are no active nests, and work must stop if one is found. Programming clearance for September to February avoids the issue entirely.
Yes. Buildings support nesting swallows, house martins, swifts, and occasionally barn owls, so demolition within the season needs checking in the same way.
Approval is not always the end of the ecology work. Many permissions carry conditions requiring a construction environmental management plan or a biodiversity mitigation and enhancement scheme before development can begin.
Read about cemps & mitigation plans →
Other species: Bats · Badgers · Otters · Red squirrels · Pine martens · Irish hare · Barn owls
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