Wild Swift Nest Box Design and Installation

Effective swift conservation requires properly designed and positioned nest boxes, as swifts have very specific requirements for nest site temperature, entrance size, and location.

Key Facts

Swift nest boxes should face between north-east and south-east to avoid overheating in direct afternoon sun
The entrance hole should be 28-32 mm wide and 65-70 mm tall — large enough for swifts but excludable by sparrows
Boxes should be installed at least 5 metres above ground with a clear flight path below the entrance
Internal volume of approximately 1,600 cubic centimetres provides adequate nesting space for a pair
Swift calling playing through a small speaker near boxes significantly increases occupancy rate

Welfare Considerations

Poorly designed or positioned swift nest boxes provide no welfare benefit and can harm broods through overheating or predator access. A box installed correctly provides a safe, thermally appropriate nest site for decades, supporting multiple generations of breeding pairs. The welfare value of each successful nest box is compounded over time as young return to natal sites in subsequent years. Installation during building renovation at minimal additional cost prevents the habitat loss that drives population decline. Communities that create "swift neighbourhoods" — clusters of boxes on multiple buildings — establish local breeding colonies with excellent long-term welfare outcomes.

What You Can Do

Install boxes to RSPB and Swift Conservation specifications including correct entrance dimensions and orientation
Set up a soft call playback system near boxes during April to July to attract prospecting swifts
Monitor boxes annually and report occupancy to local swift groups and national recording schemes
Encourage neighbours and local authorities to install boxes on suitable buildings in your area