The city council wants to make changes to Belgrave Hall as part of its plans to use the historic building for events.
It wants to put in a new semi-permanent 18m by 9.5m marquee, move a greenhouse, install two new wrought-iron gates and put in lighting between the marqee and the house.
The hall in Church Road, Belgrave, is no longer open as a museum due to declining visitor numbers, but the council wants to use it for 20 to 30 events each summer.
The council's planning committee will decide on the changes to the hall at a meeting on Wednesday.