House Martin Welfare and Conservation

House martins are declining summer visitors dependent on mud nests attached to buildings and high insect availability for breeding success.

Key Facts

House martin populations have declined by around 50% in the UK since the 1970s
They build cup-shaped mud nests under building eaves that require adequate mud sources nearby
Insect decline has reduced food availability, particularly affecting chick survival
House martin cups and artificial nest boxes can be installed to replace nests lost to building renovation

Welfare Considerations

House martin welfare is affected by both nest site availability and food abundance. Nest loss during building renovation — when eaves are replaced, soffits sealed, or render repaired — removes breeding sites that breeding pairs return to year after year with strong site fidelity. Breeding pairs that lose nests to renovation lose their reproductive opportunity for that season and may fail to find suitable alternatives. Chick starvation due to insect scarcity in prolonged periods of cool or wet weather causes significant welfare harm. Installing replacement artificial cups before renovation and maintaining mud availability near nesting sites can mitigate some welfare impacts.

What You Can Do

Install house martin cups under eaves before renovating buildings where martins have nested
Preserve mud-rich areas near potential nest sites to provide nest building material
Report house martin colony locations to BTO's Breeding Bird Survey to support monitoring
Advocate for permitted development guidance that protects house martin nests during building renovation