The restoration of the laundry building will be followed by the redevelopment of its surrounding allotments and gardens thanks to the Woodland Routes to Wellbeing project funded by the BIG Lottery Fund.
Justin Albert, Director for the National Trust in Wales, said: “It was a great honour to welcome Lord Elis-Thomas to Tredegar House today and to acquaint him with some of the superb work happening at National Trust places across Wales.
“We are delighted the Welsh Government shares our commitment towards the local community here in Duffryn, and we thank the Government for the important role they are playing in opening up this new space for everyone to enjoy.
“Following a successful project to repair to roof of the mansion house last year, it is fantastic to see further investment that helps look after the long-term well-being of the Tredegar House estate. We are also delighted to be able to bring a previously derelict and disused building back to life and deliver on our promise to create opportunities for those living on the Duffryn estate.”