Wild House Martin Conservation Welfare

House martins are colonial summer migrants that nest under the eaves of buildings, but declining nest site availability from modern construction is a major driver of population decline. Supporting house martins benefits both individual birds and declining populations.

Key Facts

House martin populations in the UK declined by approximately 59% between 1969 and 2018
The species nests colonially, building cup-shaped mud nests under the eaves of buildings
Modern construction with smooth fascia boards and sealed eaves provides few suitable nesting sites
House martins return to the same nest sites year after year - site loss from building renovation is permanent
Artificial nest cups fixed under eaves attract new colonists and supplement existing colonies
House martins feed on aerial insects at higher altitude than swallows, requiring good aerial insect abundance
Wet summers that ground insects reduce chick provisioning and breeding success
Late departures in autumn may result in chicks being left in UK when cold weather grounds insects

Welfare Considerations

House martin welfare is tied to nest site availability and aerial insect abundance. Loss of traditional nesting sites through building renovation permanently removes breeding opportunities for site-faithful birds. Artificial nest provision directly addresses this welfare need. Wet summers with reduced aerial insect availability create chick starvation risk, particularly for second broods hatching late in the season. Individual welfare and conservation goals align perfectly for house martins - supporting individual breeding pairs supports population recovery.

What You Can Do

Install artificial house martin nest cups under the eaves of suitable buildings
Do not remove house martin nests or block access to existing nest sites during the breeding season
Reduce pesticide use to maintain aerial insect populations that house martins depend on
Support planning policies that require house martin nest provisions in new residential construction