Wild bird nest box size guide

Wild Bird

Description

Nestbox

Hole Size

A bird box with a smaller hole is ideal for blue tits.

25mm

Similar to blue tits, but with a slightly larger hole in the nestbox.

32mm

House martins are famed for living under the eaves of houses, so ideally you would want a nest cup.

Articial nestbox under the eave

House sparrows typically use nestboxes with 32mm holes, but since they are a communal species can also use a colony nestbox.

32mm

Nuthatches use a nestbox with a smaller hole.

 

28mm

Robins typically require an open-fronted nestbox that should be hidden behind vegetation.

Open-fronted nestbox

As starlings are slightly larger birds, the nestbox hole would ideally be approximately 45mm.

 

45mm