A total of $5 million has been allocated to the project by the Catholic Archdiocese of Canberra and Goulburn.

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Restoration committee member Trish Groves said so far there had been almost $6 million spent on restoration works with a Federal Government grant awarded in 2006 and millions raised by the community since then.

Mrs Groves said the additional money "might not see the renovation to completion but it will be close."

While there were no fixed dates for completion, she hoped the restoration would be completed reasonably quickly.

"The scope of works will be determined by professionals after an inspection," she said.

St Peter and Paul's Old Cathedral is the only green stone building of its type in the world. The cathedral started construction in 1844 and was finished 46 years later in 1890

After decades of neglect the building requires extensive work to restore it to former glory.

Wall rotation on the north wall, water seepage, stabilisation of the floor, rendering and plumbing issues all still need to be fixed.

"We want to make sure the building is treated with the respect it deserves," Mrs Groves said.

One of the main issues was rising damp that had made its way "a few feet up the walls".

"It took a lot of money and a lot of time [to fix]," Mrs Groves said.

She said the majority of rising damp had been dealt with but there was still a portion from roof leakage.

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"You name it everything has been an issue," Mrs Groves said and laughed.

"It's an exciting time."

The history enthusiast was Goulburn born and bred and has strong connections with the cathedral.

Her grandfather George Stanley Wyles and father George Frederick Wyles had both worked on the building with the latter undertaking gold leaf detailing in the 1950s.

Mrs Groves said she felt like she was paying homage to her father's work by helping with the restoration.

"We are temporary custodians of the building and need to leave it for future generations to enjoy."

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