Improvement works totalling £2m will be carried out at The Nene Centre at Thrapston and The Pemberton Centre in Rushden.
East Northamptonshire Council says the improvements will result in a revamp of services at both centres, with the ultimate aim of making them more attractive to visitors as part of the council’s business plan to increase income.
Money has also been set aside to replace the roof at The Nene Centre, following a series of problems of leaking and other issues over the years.
A report from roof specialists has advised complete replacement as the most cost effective option and the council intends to recover the cost of the replacement through legal proceedings.
It is expected that The Nene Centre will need to close for work to start in September 2012 and is likely to remain closed for up to nine months while the work takes place.
The planned revamp will also take place while the centre is closed, so when it reopens customers will see improvements in the fitness suite and other services.
The local authority says the revamp work at The Pemberton Centre can be done with most of the centre remaining open.
The council says customers will be notified in advance of the exact date of closure and will be kept informed throughout the work.
Cllr Steven North, leader of East Northamptonshire Council, said: “The council apologises for the inevitable inconvenience this will cause customers but the roof work is essential to ensure the long term future of the Nene Centre.”