The council estimates it would cost the average Hamilton ratepayer $13 per year for 10 years, and is one of two options to be put forward for public feedback as part of draft plan.
The second option would see a brand new pool being built in the city in 2025/26 at a forecast cost of $26 million.
Community committee chairman Mark Bunting is a big fan of the dome proposal.
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The Centennial Pool complex in Thames has got more use out of its outdoor pool since it placed a dome over it in winter months.
“It’s a reasonably quick fix and would give the city seven more months of summer at Waterworld ... It means we would have a fantastic city asset being fully used instead of sitting there doing nothing for half the year,” he said in a statement.