Swift Colony Welfare and Conservation

Swifts are aerial masters that breed in colonies in buildings and face welfare threats from loss of nesting sites and changes in insect abundance.

Key Facts

Swifts spend almost their entire lives airborne except when nesting
Swift populations have declined by around 58% in the UK since 1995
Building renovations that seal eaves and rooflines destroy nesting sites without replacement
Swift bricks and nest boxes can replace lost sites and support colony establishment

Welfare Considerations

Swift welfare during breeding is tied to colony integrity and nesting site availability. Swifts are faithful to nesting sites across decades, and loss of a nesting colony through building work causes displacement that may leave birds unable to breed successfully. The highly social nature of swift colonies means that pairs without nesting sites often call near occupied colonies, and distress calls attract other swifts — making colony protection important not just for individual pairs but for the wider population. Installation of swift bricks in renovated buildings maintains colony continuity while improving building energy efficiency.

What You Can Do

Check for swift nesting sites before renovating or re-roofing buildings between May and August
Install swift bricks or external swift boxes on south-facing walls of suitable buildings
Report swift colonies to local swift groups so sites can be monitored and protected
Join or support swift conservation groups working to protect and restore nesting sites