Chorley’s historic Astley Hall will close for two months for restoration work.
The Grade I-listed building, which is owned and managed by Chorley Council, is scheduled to shut in January and February.
It is part of a 10-year building maintenance programme to ensure the hall is in good condition for the future.
A team of surveyors specialising in historic buildings have been inspecting Astley Hall for the last few months, which has already seen some rooms, including the Long Gallery on the top floor, closed to visitors while work is ongoing.
The main focus of the conservation work is on the misuse of materials in the 1950s and 1980s.
The work during the closure will include an inspection of the foundations and footings of the timber frame.
There will also be a close inspection of the render to the front of the building and a review of the front elevation windows.
Coun Bev Murray, who oversees the Astley complex for the council, said: “It is a shame that we have to completely close Astley Hall to visitors for two months, but this work is essential to ensuring the condition of the hall for the future.
“The initial inspection work has revealed some issues that require further exploration but we are confident that these can be resolved.
“We made the decision to close the Long Gallery first, as specialist surveyors have been investigating the structure beneath the floor, but this should reopen once the survey is complete and the remedial work has been done.
“It is important that these works take place and we are looking forward to reopening in March and welcoming visitors back to Astley Hall every weekend.”
Astley Farmhouse, Astley Park, the Walled Garden and the Coach House will remain open as normal.