Common Swift Colony Welfare: Protecting Nesting Sites

An evidence-based guide to the welfare challenges facing common swift colonies as modern building renovations and urban development destroy their traditional nesting sites.

Key Facts

Common swifts (Apus apus) nest almost exclusively in cavities in old buildings — loss of these sites through renovation is the primary driver of UK population decline (51% since 1995).
Swifts are highly site-faithful, returning to the same nest holes year after year; losing a nest site causes significant stress and reduces breeding success over multiple years.
Colonies provide social facilitation for pair bonding and breeding — isolated pairs have lower success than those embedded in larger groups.
Nest site loss forces displaced swifts into suboptimal locations or prevents breeding entirely, causing welfare harms through frustrated nesting motivation and reduced reproductive success.
Swift bricks (nest boxes integrated into building fabric) achieve >80% occupation rates when sited correctly — north or east facing, under eaves, at least 5m above ground.
Building regulations in several UK local authorities now require swift bricks in renovations — Bristol, Brighton, and London boroughs lead this policy movement.
Swift colonies produce audible 'screaming parties' — hearing these at a site is the surest sign active nests are present and renovation must be carefully phased.

Welfare Considerations

Swift colonies are lost one building at a time — but they can be rebuilt the same way. Install at least two swift bricks per property during any renovation. Join your local swift group to map colonies and engage planning authorities. Advocate for mandatory swift brick inclusion in building regulations nationally. Every nest site preserved keeps a colony intact for decades, since swifts live up to 21 years.

What You Can Do

Install swift bricks or nest boxes on your property following RSPB/Swift Conservation guidelines
Contact your local planning authority to advocate for swift brick requirements in building regulations
Join a local swift group to help map and monitor colonies in your area
Donate to Swift Conservation (swift.org.uk) or Action for Swifts