A Perth council says it "deeply regrets" a mishap that saw 46 trees mistakenly cut down at a popular park during an $8.1 million redevelopment.

The 4.6-hectare Elizabeth Baillie Park is being upgraded to include 43 new trees and 23,160 new plants, while the accompanying heritage-listed house is being transformed into a hospitality and entertainment district.

As construction nears its end, the Town of Victoria Park has reviewed the works only to find that dozens more trees have been removed than the 30 that had been authorised.

It is unclear exactly how it happened, but the town believes it is likely due to the poor condition of some trees, inadequate site management, and the need to accommodate new infrastructure within the park.

The town said the removals fell short of expectations

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