The restoration of Castle Gardens, a Lisburn City Council project costing £4.2 million, is one of the ten largest urban park conservation schemes grant aided in the UK by the Heritage Lottery Fund. This project has restored Castle Gardens, conserving and enhancing its unique historic character and ensuring that the park plays a positive key role in the changing social and economic fortunes of Lisburn City. The archaeological works carried out uncovered some significant historical artifacts such as a 17th Century Gazebo (summer house), Terrace Walls and a stone perron stairway.
New facilities in the gardens now include an Information Point with displays outlining the history of the Gardens and their restoration, fully accessible public toilets and an Education Centre located in an original Second World War air raid shelter. The Education Service is managed by the nearby Irish Linen Centre & Lisburn Musuem.