Repairing Douglas Promenade could cost in the region of ?10 million.
Director of Highways Richard Pearson says the carriage way is effectively made up of concrete slabs with a poor quality fill-in material.
Over the years that has led to an uneven surface that's susceptible to frost.
The ?10m figure is in the forward capital programme although, since there is no detailed design at the moment, that amount is not definite.
It would also be subject to Tynwald approval.
Mr Pearson says whenever the work is carried out, it could pave the way for transport changes on the promenade - starting by relocating the horse trams from the middle of the road.
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