Major repair work is to be carried out at a public building in Lincoln after part of a slate broke away and fell into the street.
Scaffolding and netting was placed around the Terrace on Grantham Street after the incident in June.
The city council's planning committee has since approved plans to re-clad the structure with a more stable material.
Work will begin in January once the authority has sourced the replacement cladding.
Kate Ellis, economic sustainability and tourism programme manager, said: "We've now investigated the material and after taking specialist advice have opted to replace the cladding on the whole building with a more suitable material.
"We believe there is a fault with the original cladding and are now looking into the matter. We're pleased that planning permission has been granted to carry out this work.
"We will now source a suitable alternative material and, subject to the approval of that material by the planning committee, set about replacing the cladding."
The Terrace, which is managed by the council, contains workshops, studios and offices.