Peregrine falcons nesting at the Palace of Westminster are set to have an "unavoidable and major impact" on a planned £26 million restoration of the House of Lords roof, according to parliamentary assessments. The birds, which are legally protected, effectively dictate when and how construction work can proceed, meaning contractors must work around their presence rather than the other way round.

Peregrine falcons have become a well-known fixture at Parliament in recent years, drawing public interest as they nest among the historic building's towers and stonework. Because the species is protected under UK wildlife law, any building work affecting their habitat is subject to restrictions, and officials have acknowledged that accommodating the birds will significantly complicate the scale and timing of the roof replacement project.