ROOF repairs at the Geoff Moulder Leisure Complex training pool will take a week longer than originally planned.
Schools will have their return to the pool delayed by a week after their summer holidays, resuming use from Monday, September 15.
The council says there will be a small reduction in public general swimming in the evenings and on Saturday morning.
Swimming is unaffected weekdays from 7.30am to 4pm, but three lanes will be set aside in the evenings for club use.
Public swimming times on Saturday will be reduced from 10am to 4pm to 1-4pm.
Coun Yvonne Gunter, Boston Borough Council portfolio holder for leisure services, said: “We do apologise for any inconvenience. The roof replacement works were more complex and extensive than first envisaged but we thought better to get it finished than have more disruption later.”