House sparrows have disappeared from many UK cities where they were once ubiquitous. Understanding the causes of their decline and how urban environments can be improved for small birds is essential welfare and conservation knowledge.
House sparrow welfare is inseparable from urban habitat quality. A city with manicured parks, sealed buildings, and pesticide-treated gardens is a habitat desert for sparrows. Restoring urban sparrow populations requires changes at individual garden, street, and policy level simultaneously. Individual welfare actions — installing nest boxes, reducing cat outdoor time during nesting, and creating weedy patches for foraging — produce measurable local benefits. At scale, urban greening policies, building regulations requiring swift and sparrow bricks, and reduced pesticide use in public green spaces would restore the urban ecosystem services on which house sparrows and many other species depend.