The Collared Flycatcher is a hole nester with essentially the same nest-box requirements as its close relative the European Pied Flycatcher, and the two species often compete for the same boxes where they occur together. Note that nest-box tips for the species are only relevant within its Swedish range — see the section on geographical limitation below.
| Measurement | Value | |---|---| | Entrance hole | approx. 32 mm round | | Internal floor dimensions | approx. 12 × 12 cm | | Height of hole above floor | 12–17 cm | | Mounting height | 1.5–4 m |