Fullwell Cross Leisure Centre, in High Street, Barkingside, temporarily closed on June 3 after reinforced autoclaved aerated concrete (RAAC) was identified in parts of the building.
There is no timeframe for the remedial works to be complete, Redbridge Council said, but it is “committed to completing them as soon as is practically possible”.
A spokesperson added that expected costs have been drawn up for both the replacement and repair of the roof above the pool, where RAAC was found.
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The mechanical and electrical systems at the leisure centre could also need replacing if no longer fit for purpose, and are being reviewed by officers.
RAAC was identified by engineers during a routine structural assessment at the beginning of June.
Although there was no “immediate risk” to customers, RAAC can weaken and eventually collapse if it is exposed to moisture.
The centre was therefore shut as a “precautionary measure” by its operator Vision RCL and Redbridge Council.
In its most recent statement on the closure, the council said: “This is not a decision based on funding, nor does it reflect a lack of commitment to the centre.
“It is a necessary measure to ensure the safety of everyone who uses or works in the building.
“We are working closely with Vision RCL and our appointed engineers to finalise the scope of remedial works and to develop a costed plan for the future of the site.”
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The spa, reception and studio spaces at the centre have since reopened, with extra signs in place to ensure the safety of visitors.
Swimming lessons have been temporarily relocated and access to alternative leisure centres is being offered for members.
The council has promised to provide regular updates on the situation and share a confirmed timeline for the remedial works when ready.