The building dates back to 1865
This rare shot inside Derby Guildhall Market's roof shows it has more than a hint of St Pancras station about it.
BBC Radio Derby's Andy Potter was given access to the grand ceiling as work begins on its £500,000 restoration.
A survey last year suggested the roof needed £2m worth of repairs but with money tight, Derby City Council is having to prioritise essential work.
So rotten parts of the decking are to be fixed, copper and lead will be replaced and the roof repainted.
Since July, constructors have been erecting scaffolding during the night to minimise disruptions to market stall holders.
Now work is ready to begin on the 145-year-old building.
Derby City Council's Head of Maintenance Phil Derbyshire said: "We've decided to do the essential work.
"The paint is flaking and there are some areas of rotten timberwork.
"We're going to replace a lot of that locally and do some copper and leading replacement.
"We're also going to give it a big clean down and a good thorough decoration."