The developer behind Tasmania's proposed AFL stadium has hit back at a report that recommended the project not go ahead, warning more delays will bump up the cost.

Macquarie Point Development Corporation chief executive Anne Beach also said the state planning commission's criticism of the stadium's size was a "matter of opinion".

Construction of a roofed stadium at Macquarie Point in Hobart is a condition of the Tasmania Devils entering the AFL and AFLW in 2028.

The project copped a scathing assessment on Wednesday from the planning commission, which said the stadium was not worth the cost, too big and would impact heritage values.

To get the green light, the stadium must be approved by Tasmania's parliament, with a vote expected to be held by the end of the year.

Under the AFL deal,

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