A quarter of a million pounds is being spent on repairing Felbrigg's roof
Felbrigg Hall near Cromer is undergoing extensive restoration thanks in part to a donation from a late volunteer on the National Trust-owned site.
The £250,000 project will see parts of the building re-roofed to protect the collections housed in the hall.
"When it's finished no-one will notice any difference - although we will notice we can't see the sky anymore," said property manager Ray Sandham.
Building work is expected to be completed in April 2011.
During renovations a viewing platform has been installed in order to give pre-booked visitors a chance to see the roof at close quarters, as well as providing a bird's-eye view of the grounds.
"We know they love to get closer to conservation in action, so what better way than to let them see more with access to a platform at roof height, whilst work progresses," said Mr Sandham.
The repair work has required 25,000ft (7,620m) of scaffold tubing, almost enough to reach the top of Mount Everest when laid end to end.
"Visitors looking up from ground level wouldn't know it, but one of Felbrigg's previous owners did a patch repair job on the roof, using tiles thought to have originated from an estate barn," said Paul Coleman, a National Trust building surveyor.
"Not matching the style or make of the original roof tiles, it is mainly these that are now in need of replacing," he added.
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