Robert 
The estimated cost to repair "one of the most important buildings in Surrey" has reached more than £1.7m after a number of additional issues were discovered.
Wilmer House, the Grade I Listed building which is home to Farnham Museum, was due to receive essential repairs funded by a £734,000 grant from the Arts Council.
But more problems, including decaying brickwork and collapsing window arches were found, increasing the costs to £1.72m.
Waverley Borough Council will have to foot £735,000 of the bill, according to the Local Democracy Reporting Service.
A third of that amount was agreed for the project in a council meeting on Tuesday.
Another 230,000 will be provided by National Lottery funding and about £20,000 of "other external funding", the council said.
'Statutory obligation'
Councillor Kika Mirylees, portfolio holder for community services and leisure said: "As we know, the challenges that come with a Grade I listed building are not easy.
"The first phase was always going to be one of uncertainty.
"Like it or not Waverley has a statutory obligation to carry out the repair work in a timely manner due to planning law and health and safety concerns – and the funding given to us by the Arts Council."
It is expected that the work will take about 18 weeks to complete and will be finished by mid-October, the meeting heard, but further delays would push the project into 2026 and add £69,000 to the costs.
