Saltdean Lido has lost £250,000 in the past five years, its owner said
An East Sussex outdoor swimming baths which faces closure could have its listed building status upgraded, English Heritage has said.
The 1930s Art Deco lido in Saltdean is currently Grade II-listed, but that could be changed to Grade II*.
It would mean English Heritage would have to be consulted about renovations or developments.
The leaseholder of the lido has proposed turning it into an apartment block and an all-year leisure facility.
Dennis Audley, who has leased the lido from Brighton and Hove City Council for the past 10 years, said it had lost more than £250,000 over five years due to a succession of poor summers.
He said he had "no intention of knocking the building down" and the proposals would see the pool removed and new facilities built.
English Heritage said it would consider recommending the lido's listed status be upgraded.
It said it would be down to the Department for Culture, Media and Sport to make the final decision.
The Save Saltdean Lido Campaign, which was set up to restore the lido to its former glory and protect it from redevelopment, said it would make a formal application to English Heritage.