Wild Swift Conservation and Building Retrofit

Common swifts depend almost entirely on old buildings for nesting, making urban development and building renovation a critical welfare and conservation challenge.

Key Facts

Common swift populations in the UK declined by 62% between 1995 and 2021
Swifts use the same nest sites for decades and return to them from their African wintering grounds annually
Building renovation that blocks nest access causes direct nest destruction during or before breeding
Swift bricks — nest boxes integrated into building fabric — can replace lost cavities at low cost
Swifts are entirely aerial outside nesting, catching insects, drinking, bathing, and even sleeping on the wing

Welfare Considerations

Wild swift welfare is critically dependent on nesting site availability. Renovation of old buildings that blocks swift access to eaves and cavities destroys nesting sites used for decades, displacing breeding pairs during the most welfare-sensitive period of the breeding cycle. Birds returning from Africa to find sealed nest sites lose the investment of years of site fidelity. Swift bricks installed during renovation replace cavities at marginal cost and satisfy the welfare need without compromising building energy efficiency. Planning conditions requiring swift brick installation in renovation projects protect nesting habitat at scale.

What You Can Do

Install swift bricks or nest boxes on suitable south-facing buildings well before swift arrival in April
Check buildings for swift use before renovation and report active nests to the local authority
Advocate for planning policy requiring swift brick installation in new builds and major renovations
Play swift call recordings near potential nest sites during April-May to attract prospecting birds