Stannington Post Office will close for refurbishment on April 22.
The branch, at 652 Stannington Road, will reopen at 1pm on April 25. After that, opening hours will be extended to 6am to 10pm Monday to Sunday.
During the closure, customers’ nearest Post Offices will be 304 Stannington Road and Crookes.
Post Office area manager Caroline Pritchard said: “This modernisation is part of a major investment programme and marks a commitment to no more branch closures.”