Olney Post Office will open for an additional 59 hours a week next month - but first it will close for a ten-day refurbishment.
The branch in Market Place will be shut from 5.30pm on October 27, although the retail store will remain open.
When it re-opens on November 12 the site will start to offer a range of new services, and will be open seven days a week from 6am-9pm.
Services offered will include bill payment, banking, benefits and travel money, home shopping returns and Local Collect, plus a new open plan layout.
Regional manager Kevin Shepherd said: “We know how important Post Office services are to residents in Olney and we are confident this vibrant modern Post Office at the heart of the community will be popular.
“The modernisation is part of a major government investment programme enabling us to continue investing in the Post Office network and to map out a bold growth strategy to the end of the decade.”