Controversial work to Hove’s Carnegie Library has faced delays after flooding during heavy rain last week.
The work is set to reconfigure the ground and basement floors to make space for a children’s nursery.
Campaigners opposed the move, claiming by removing radial shelves it would ‘vandalise’ the library’s heritage features.
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Work was set to be complete by Monday (August 20), but the council said that as a result of delays, it will now be closed until Tuesday, August 28.
It said contractors have found that the drains and some sections of the flooring need more extensive works than previously thought.
Cllr Emma Daniel, chair of the council’s neighbourhoods committee, said: “Our contractors will be working seven days a week to complete all the work that is needed.
“We’re really sorry for this delay and we apologise to all the users of Hove Library for any inconvenience.”