Astley Hall will open its doors for one day only for people to have a glimpse of some features that have been hidden for decades.
The historic hall, which is located at Astley Park, is undergoing extensive restoration work as part of an ongoing 10-year building maintenance programme.
Visitors will be able to have a look behind the panels and see the work that has already taken place when it opens for one day on Friday for 45-minute guided tours.
The Grade I-listed building, which is owned and managed by Chorley Council, has been closed while a team of specialist surveyors inspect and review the foundations and materials to ensure the historic building is in good condition for future generations.
Booking for the tours is essential as places are already filling up, with the only slots still available at 5pm, 6pm and 7pm.
The tours cost £5 and the fee can be paid on the day by either cash or card.
To book a place, email AstleyHall@chorley.gov.uk or call 01257 515926.
Astley Farmhouse, Astley Park, the Walled Garden and the Coach House, including the Chorley Remembers Experience and Cafe Ambio, remain open as normal.