House martins have declined by 54% since 1969 and depend on built structures for nesting, creating conservation opportunities and obligations for householders and developers.
House martins that lose nest sites to building renovation must expend significant energy finding alternative sites or may fail to breed entirely. The welfare implications extend across generations as site fidelity means young birds return to natal areas expecting to find nest sites. Loss of insect prey due to pesticide use and land management change causes nutritional stress during the chick-rearing period, increasing chick mortality. Simple provision of artificial nest cups provides immediate welfare benefit and conservation value, and development that incorporates swallow-friendly design offers long-term habitat.