A joint statement from the council and charity OneRen said work has proved “complex and challenging, with a number of unforeseen issues only able to be identified when construction was underway”.
The statement added: “The contractors Kier, have encountered a number of unforeseen issues which have impacted the timeline for completion and by extension, the opening.”
However both organisations now expect work to be completed by the end of 2025, which would then let the local authority begin filling the museum with items.
Once completed the museum should host 60 digital displays, a new garden gallery, a public courtyard, a caf茅 and picnic areas.
Gallery space should increase by around 25%, giving room for hundreds more items to be put on display.
It has been funded by Renfrewshire Council, the Scottish government, the National Lottery Heritage Fund, Historic Environment Scotland and a charitable fundraising campaign.