That blackbird perching on your fence post is already collecting twigs, and within a week there could be eggs tucked in behind your garden hedge or in the shrubs along the back border.
Hedge cutting or tree work gets booked, the team arrives, and only then does someone mention nesting birds.
At that point, the job either gets paused or goes ahead without a proper check, and that second option carries a real legal risk.
Every active nest is protected by law, and several routine garden tasks need to be approached very differently.
Here is exactly everything you should know about bird nesting season from expert tree surgeons.
What the Wildlife and Countryside Act 1981 says
The Wildlife and Countryside Act 1981 is the legislation protecting nesting birds across the UK, including Scotland.
Under the Act, it is a criminal offence to intentionally take or destroy the nest of any wild bird while that nest is in use or being built.
The offence also covers taking or destroying any egg, and killing, injuring or disturbing any wild bird at its nest site. The protection applies to every wild bird species without exception.
The robin nesting in your ivy, the wren in the hedgerow, and the blackbird in the laurel all fall under the same legal protection as rarer species like barn owls or the skylark.
Breaking the law here carries a significant fine.
In serious cases, disturbing nesting birds or destroying a nest can result in up to six months in prison.
Wildlife crime officers do investigate complaints, and reports of nests disturbed during vegetation clearance and hedge trimming reach councils and the RSPCA every year.
When does bird nesting season start and end in the UK?
The core nesting period begins around March and runs to the end of August, though the actual dates shift depending on species, the weather in a given year, and what part of the country you are situated in.
Birds start nesting in earnest from March, though some begin nest building as early as February during a mild winter.
Ground nesting birds, including the skylark, use open fields and rough grass right through into late summer. Barn owls can have eggs in the nest year round, which is why any tree with a potential owl roost needs checking before work begins.
March and September mark the outer boundaries of the period where nesting activity is highest.
Any work near trees, hedgerows, or shrubs during these months carries the greatest risk of disturbing nesting birds or other wildlife.
What can’t be done during bird nesting season
Hedge cutting and trimming
Hedgerows and garden hedges are heavily used nesting habitat.
Cutting a hedge during the nesting period without checking for active nests risks destroying nesting materials, eggs and chicks still inside.
Our hedge trimming team won’t cut a hedge between March and September without first inspecting for active nests.
If a nest is found, the work is postponed until after the young have fledged and the nest is no longer in use. There’s no safe way to work around an occupied nest.
Tree surgery near nesting sites
Crown reductions, tree pruning, and tree removal during the nesting period all carry the same risk.
Trees are major nesting habitat for garden birds.
Blue tits and treecreepers use holes in older timber, while thrushes build open cup nests in the outer canopy, and larger cavities attract owls and jackdaws.
Before any tree surgery work starts between March and September, a nest check is part of the process.
A visible nest doesn’t automatically confirm a bird is using it, but any nest that looks fresh or potentially occupied stops work until it can be properly assessed.
Vegetation clearance and ground work
Ground nesting birds use rough grass, scrub, and low vegetation to raise their young.
Clearance of these habitats during the nesting period can disturb active nests just as easily as cutting a tree or hedge.
On larger plots and estate grounds, significant areas of vegetation can be cleared in a single operation, which raises the risk considerably. A pre-work check is as relevant here as it is for tree surgery or hedge trimming.
What you can do if you need work done
Get a pre-work nest check
A qualified specialist arborist can check a tree, hedge, or area of vegetation for active nests before work begins.
Our tree survey team carries out these checks as part of the process for any job scheduled during the nesting period.
A check doesn’t automatically mean the work has to stop.
If there are no active nests in the specific area where work is planned, it may be possible to proceed with care. The check establishes what’s there before any decisions are made.
Schedule work outside the nesting period
The cleanest approach, where timing allows, is to schedule tree work and hedge cutting in autumn and winter. October through to late February is generally the lower-risk window, and planning for this period avoids the need for a nest survey entirely.
For larger projects, including estate grounds and commercial properties, planning the schedule around the nesting period from the outset avoids the situation where a job stops mid-way because an active nest turns up. That kind of delay is avoidable with a bit of forward planning.
If you find a nest while doing your own garden work
If you’re doing your own gardening and come across an active nest, photograph it and leave the area alone.
Stay away from it until you’re confident the nest is no longer occupied, the eggs have hatched, and the chicks have fledged and gone.
A nest with eggs or chicks is protected by law. A nest that’s visibly empty, cold, and showing no sign of recent use is a different situation, but if there’s any doubt, leave it and check again in a week.
Where do birds build their nests?
Garden birds use a wider range of nesting sites than the obvious hedgerow or shrub. Dense vegetation provides cover from potential predators, but birds also nest in:
- Tree cavities and dead wood, which attract hole-nesting species including tits and treecreepers
- Ivy and dense climbers against walls and fences
- Roof spaces and gaps in outbuildings, where birds carry in twig, moss, and grass
- Long grass and rough ground, particularly on larger plots
- Dense border planting and established perennial beds
Birds adapt quickly to whatever habitat a garden offers. A species that typically uses a hedgerow will also nest in a dense pyracantha trained against a wall, or in thick ivy covering a fence panel.
Gardens that offer food sources like worms, berries, and insects close to good cover tend to attract more nesting birds.
How bird nesting affects tree work specifically
Tree work is where nesting season causes the most scheduling complications for homeowners. A tree that needs crown reduction or removal in spring will either need a nest survey first or will need to be booked in for late autumn.
Our arborists check trees for active nests before work starts, including nests on the ground around the base, which are as relevant as nests in the canopy.
The land occupier can be held responsible for disturbance to nesting birds, not only the contractor. A tree surgeon who skips the check is exposing you to the same legal risk they’re running themselves.
In some cases, NatureScot (Scotland’s nature agency, equivalent to Natural England elsewhere in the UK) can issue a licence to allow work that would otherwise disturb a protected species.
These licences require good reason and a formal process, and they’re not a quick fix for a job that hasn’t been planned around the nesting season.
How to avoid harming birds during nesting season
The best way to avoid harming birds during nesting season is to plan when work happens rather than trying to work around nests after they’ve been found. Checking before cutting is always quicker than stopping mid-job.
Two approaches cover the vast majority of situations: get tree work and hedge cutting done in autumn and winter where timing allows, and build a nest check into any job that falls between March and September.
Neither step requires leaving the garden unmanaged through the whole summer. The Countryside Act of 1981 sets out the legal obligations, but working around the nesting period is good practice regardless of the law.
We work with homeowners, estates, and commercial clients across Glasgow and the Central Belt.
Scheduling around the bird nesting season is part of how we plan the annual programme of grounds work.
If you’ve got tree surgery or hedge work due and want to know where you stand, call us on 07946 322717 or fill in our contact form and we’ll advise on timing and next steps.
Frequently asked questions about bird nesting season
When to cut hedges to avoid nesting birds?
The safest window for hedge cutting is October through to late February. If you need to cut a hedge between March and September, a nest check before any cutting starts is the right approach.
Many garden birds build their nests in hedgerows, and trimming without checking risks an offence under the Wildlife and Countryside Act 1981.
What month do birds nest in the UK?
Most bird species in the UK begin nesting in March, with activity continuing through April, May, June, and July.
Some species, including barn owls, can have eggs in the nest at almost any time of year. Ground nesting birds like the skylark use open ground through into August and September.
Is it illegal to disturb nesting birds in the UK?
Yes. The Wildlife and Countryside Act 1981 makes it a criminal offence to intentionally disturb a wild bird at an active nest, to take or destroy a nest while in use, or to take or destroy eggs.
The offence covers all wild bird species, not only those on a protected list. Penalties include fines and up to six months in prison.
Do birds come back to the same nest every year?
Some species do reuse nests, particularly larger birds like thrushes and some raptors. Many smaller garden birds build fresh nests each season, though they may return to the same general area or the same section of hedge.
Finding a nest from a previous year doesn’t mean it won’t be used again, so checking the nest for fresh nesting materials and signs of occupation still makes sense before any work starts.