Common Swift Welfare and Urban Nesting

Common swifts have declined dramatically in the UK due to loss of nesting sites in modern buildings, making swift-specific conservation and urban planning provisions critical.

Key Facts

UK swift populations have declined by over 60% since 1995, largely due to building renovation
Swifts nest almost exclusively in buildings in the UK, using gaps under roof tiles and eaves
They return to the same nesting site year after year, and cannot access sealed modern buildings
Swift colonies are vulnerable to accidental disturbance during breeding season renovations
Swifts are aerial insectivores spending almost their entire non-breeding life on the wing
Swift bricks - purpose-built nest cavities - have been incorporated into planning policy in some UK areas

Welfare Considerations

The welfare of individual swifts is deeply tied to nesting site security - a pair that returns after a 10,000 mile migration from sub-Saharan Africa to find their nest site sealed faces an immediate welfare crisis. Unable to nest, birds in peak breeding condition have no reproductive outlet and may try repeatedly to enter sealed sites, causing injury. Renovation disturbance during the breeding season can trap adults with chicks or expose chicks to lethal temperature extremes or starvation. The species' extreme site fidelity means each lost site represents a pair that may fail to breed for years while repeatedly returning to check the blocked location.

What You Can Do

Install swift nest bricks or boxes on your building before any renovation work
Advocate for mandatory swift brick installation in new builds and renovations through your council
Support RSPB and Swift Conservation campaigns for stronger planning protections
Report swift colonies to local recording groups to help identify and protect nesting sites
Avoid building work near known swift sites between May and August