Denford added that, while they hoped all five eggs would hatch, often the final egg did not.
The birds’ nest box is also fitted with a webcam, and visitors to the Woking Peregrine Project website can watch a live stream.
The box was first installed in Export House in 2016.
Peregrine falcon populations in the UK neared extinction in the 1960s due to human persecution and pesticides in their food chain. However, improved legislation and protection helped the birds.
Despite peregrines historically living on cliffs, tall buildings also make an ideal nesting place, and the population has expanded to urban areas including large office buildings and churches.