The spire on St Mary de Castro church in Leicester has been pronounced unsafe and at risk of collapse.
From today the pedestrian route through Castle View and the area around the church will be closed off to the public.
Scaffolding is going to be erected before the spire is dismantled and rebuilt. Work could take six months and the area will be closed off and church closed to visitors
It is believed that the Middle Ages poet Geoffrey Chaucer was married in the church in 1366.