Wild Swift Colony Nest Site Conservation

Swifts are entirely dependent on built structures for nesting in the UK, making building renovation and demolition significant welfare and conservation threats to this declining species.

Key Facts

Swifts spend virtually their entire lives in flight, landing only to nest - they are one of the most aerial of all bird species.
UK swift populations have declined by over 60% since 1995, with loss of nest sites in old buildings being the primary driver.
Swift pairs typically return to the same nest hole year after year and show strong site fidelity even when nest sites are destroyed.
Swift nest bricks and nest boxes can replace lost natural sites in renovated buildings, and new builds can incorporate swift bricks during construction.
The Species Action Plan for swifts requires planning authorities in England to consider swift nesting provisions in relevant planning applications.

Welfare Considerations

Swift welfare intersects with nest site conservation in a direct and actionable way. The destruction of an active swift nest site mid-season causes the death of eggs or dependent chicks, while destruction of sites between seasons prevents future nesting by birds that would have returned. These are acute welfare harms that building owners and contractors may not intend but cause nonetheless. Swift nest monitoring and protection during renovation work, combined with provision of replacement nest sites, can prevent welfare harm while allowing necessary building maintenance. The integration of swift bricks into new developments at no meaningful cost represents an opportunity to benefit swift welfare at the planning stage.

What You Can Do

Check buildings for swift nesting activity before commissioning renovation work.
Install swift nest bricks in your building if swifts have nested previously or if suitable.
Advocate for mandatory swift provision in planning requirements for new builds.
Support Action for Swifts and local swift survey groups in your area.