An historic medieval house in the centre of Ruthin is to get a £600,000 facelift.
The house has never been open to the public
The Grade One-listed Nantclwyd House, which was recently saved from collapse, will have its interior restored and be opened to the public.
Historians believe the house was built by a medieval merchant and extended during the Elizabeth period.
More additions were made in the Georgian and Victorian times.
The house was owned privately until the 1980s, when the owner sold the building to the former Clwyd County Council.
It has never been open to the public.
The structure was in danger of collapsing before the Historic Building Trust carried out essential work, with support from the Welsh heritage organisation Cadw.
The Welsh assembly government has provided £400,000 to help with the latest restoration project.
And Denbighshire council received over £200,000 of Objective One funding from the EU as part of the package.
Samples of wood have been taken from beams at the house and are being sent for testing to provide an exact date for the house's initial construction.
Conservation architect Phil Ebbrell said: "If we can get through to the core of the timber, we can quite literally date the time, the year and even the season when the tree was felled for construction purposes.
"It would have been built for somebody of some status. Castle Street was where people of status tended to live.
"It was a large house for its time.
"We've had somebody do research into its occupancy and we've managed to trace ownership records back to the 17th century."
In its time the building has been used as a school house and a doctor's surgery as well as a private residence.
Denbighshire's head of development services Gareth Evans said: "I am delighted that the council has received this further injection of funds from Europe.
"It will allow the house to be developed to its full potential as a working townhouse, weaving Ruthin and Denbighshire's rich cultural, historical and architectural heritage into an attractive place for tourists to visit."