How UK Gardens Can Help Save Swifts

RSPB’s swift message is about homes, not bird feeders

The RSPB’s new guide to saving swifts is an important reminder that some of Britain’s most familiar summer birds are being lost for a reason that cannot be solved by putting out more seed. Swifts are often seen screaming overhead on warm evenings, racing between rooftops in small groups, yet they spend almost their entire lives in the air. They do not visit conventional garden feeders, perch on bird tables or forage on lawns in the way blackbirds, robins and house sparrows do.

For swifts, the decisive issue is usually somewhere safe to breed. They return from Africa to the same nesting areas year after year, seeking narrow cavities in eaves, gaps beneath roof tiles and spaces in older buildings. When these holes disappear during renovation, re-roofing or insulation work, a local swift colony can vanish very quickly.

That changes what ‘helping garden birds’ means for householders. A wildlife-friendly garden remains valuable, but for swifts the greatest contribution may be made at roof level: protecting existing nest access, fitting purpose-designed swift boxes, or including swift bricks when a wall is built or refurbished.

Why swifts need a different conservation approach

A bird that feeds almost entirely on the wing

Swifts eat airborne invertebrates: a mixture of flies, aphids, flying ants, small beetles and other insects carried in the air. Adults gather this aerial food into a sticky ‘bolus’ to feed their chicks. Their diet is therefore very different from the seeds, peanuts, suet and mealworms commonly offered in gardens.

This has a practical implication. Gardeners should not expect a feeder to attract swifts, and they should not attempt to feed them by throwing food into the air or leaving unsuitable food outside. Swift conservation is not about creating a feeding station. It is about retaining nest sites and supporting healthier insect-rich surroundings.

That distinction matters because well-meaning actions can distract from the real problem. A garden with immaculate paving, pesticide-treated borders and no nesting access may have several feeders yet offer little direct help to swifts. Conversely, a home with a single protected nest hole or properly installed nest box can provide a breeding opportunity that is scarce across an entire street.

The hidden cost of building maintenance

Older properties often contain the cracks and cavities that swifts use. Modern construction standards, replacement fascias, sealed rooflines and energy-efficiency upgrades can unintentionally remove them. The issue is not that home improvement should stop; draught-proof, safe and energy-efficient homes are necessary. The challenge is to carry out that work without excluding wildlife that has used a building for decades.

Swifts have strong site fidelity. A pair may return to a familiar nesting place after travelling thousands of miles, only to find the entrance sealed. Because young swifts also learn the area around their nest, losing established sites affects future recruitment as well as one breeding season.

For householders and contractors, this makes early planning essential. Once nesting is underway, access points must not be blocked, and work that could disturb an active nest needs professional advice. All wild birds, their active nests and eggs are protected in the UK. If swifts are entering a property, seek ecological guidance before roofing, pointing, rendering, replacing soffits or undertaking major external works.

What UK householders can do now

1. Check whether swifts already use your building

From late spring through summer, watch the roofline in the evening. Swifts often approach their nest at speed, curve upwards and disappear into a small gap beneath eaves, tiles or cladding. Repeated entries to the same point are a strong clue. Their distinctive high-pitched calls and fast ‘screaming parties’ around roofs can also indicate nearby nesting activity.

Keep a simple record: dates, times, number of birds and the exact access point. This information is useful if you later discuss work with a roofer, builder or ecologist. It can also be submitted to local bird recording groups or swift projects, helping map colonies that may otherwise be overlooked.

2. Protect existing access before any renovation

If swifts use a hole, do not seal it merely because it looks untidy. First establish whether it is active and whether it can be retained without compromising weatherproofing or safety. In many cases, a small, carefully designed access point can be integrated into repair work.

Ask contractors specific questions before work begins:

• Have you checked for nesting birds at eaves, under tiles and behind fascia boards?
• Can existing swift access be retained or recreated?
• If an entrance must be lost, can a permanent alternative nest box or swift brick be installed nearby?
• Will the work be scheduled outside the breeding period where possible?

The key is to make wildlife provision part of the specification, rather than an afterthought once scaffolding is in place.

3. Install swift boxes or swift bricks properly

A swift nest box is not the same as a tit box. It needs an appropriate entrance, protection from overheating and a high placement with clear flight access. Boxes are commonly fitted high on a wall, under eaves, away from regular human disturbance, with a clear approach route. Avoid placing them behind dense tree cover or where cats can reach them.

Swift bricks are even more effective as long-term measures because they are built into new walls and require virtually no maintenance. They are particularly relevant for extensions, new-build homes, schools, community buildings and housing developments. One box can help, but groups of several boxes or bricks better reflect the swift’s colonial nature and can make a site more appealing.

Installation alone does not guarantee immediate success. Swifts may take time to find a new site, especially if there is no established colony nearby. Some local swift groups use carefully timed playback calls to advertise suitable nest places, but this should be done responsibly and according to local expert advice. Loud or constant playback can disturb neighbours and wildlife, so it is not a substitute for suitable habitat and good positioning.

4. Make the garden better for insects, without expecting swifts at the feeder

Gardens cannot replace the wider landscapes that produce flying insects, but they can contribute. Plant a succession of nectar-rich native and wildlife-friendly flowers; allow part of the lawn to grow longer; retain some leaf litter and dead wood; create a small pond or damp area where feasible; and avoid routine use of pesticides.

These measures support insect life, which benefits many birds, bats, amphibians and pollinators. For swifts, the benefit is indirect and local: more insect-friendly land is better than a garden managed as a chemically treated, insect-free display space.

This is also a useful opportunity to review feeder hygiene and food choice for other garden birds. Continue feeding appropriate foods to species that use them, clean feeders regularly and provide fresh water. But do not label seed feeding as swift conservation. It is valuable garden-bird care, just not the intervention that addresses swift decline.

A wider lesson for planners, landlords and wildlife professionals

The RSPB’s guidance has implications beyond individual gardens. Swifts are affected by thousands of small decisions: a landlord replacing soffits, a school refurbishing a roof, a developer completing an estate, or a council approving building designs with no nesting provision.

Professionals can make a substantial difference at low cost when biodiversity features are included at the design stage. Swift bricks are inexpensive compared with the overall cost of construction, whereas retrofitting after a colony has been excluded is more difficult and less certain. Wildlife surveys should be proportionate, but they must happen early enough to influence the design and construction timetable.

For local communities, coordinated action is stronger than isolated boxes. Neighbours can compare sightings, identify active streets, encourage nest provision during planned renovations and work with local swift groups. A network of safe nesting places is far more useful than a single box placed in an unsuitable location.

The practical takeaway

Swifts are a striking test of whether wildlife-friendly living is built into our homes rather than confined to the garden fence. If you hear their calls above your street next summer, look up at the eaves before looking at the bird feeder. Protecting a small entrance hole, adding a well-sited swift box, or specifying swift bricks in a building project could preserve a nesting opportunity for years.

The most effective action is usually simple: identify existing nest sites, avoid excluding birds during works, and create durable alternatives where cavities have already been lost. For a bird that spends nearly all its life in flight, one secure space beneath a roof can be the difference between returning to breed and disappearing from a neighbourhood.

FAQ

Do swifts use garden bird feeders?

No. Swifts catch flying insects while airborne and do not normally land to eat seed, suet, peanuts or mealworms from garden feeders. Feeders remain useful for many other garden species, but nest-site provision is the priority for swifts.

When should I look for swifts nesting in my house?

Look during the UK breeding season, generally from late spring into summer. Evening is often best, as birds may race around rooftops before entering nest holes. Repeated entry into the same gap under eaves or tiles is a useful sign.

Can I block a hole in my roof if swifts are using it?

Do not block an active nest entrance. Wild birds’ active nests and eggs are legally protected in the UK. If repairs are needed, obtain advice from an ecologist, local swift group or relevant wildlife body before work begins, and plan an alternative access point where appropriate.

Are swift boxes guaranteed to attract swifts?

No. A box must be correctly designed, high enough, shaded from excessive heat and approached by clear open airspace. It may also take more than one season for swifts to discover it. Several boxes in a suitable area, especially near existing swifts, give better prospects.

Source: RSPB — Sat, 19 Sep 2026 01:07:03 GMT

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Editorial Team

Our team consists of passionate British birdwatchers and garden wildlife enthusiasts. We provide honest, practical advice on feeding garden birds, choosing the right feeders, and making your outdoor space a haven for UK wildlife — guided by RSPB best practice and real garden experience.