The move will save money and help to foster more collaboration between the two organisations, according to Peter Kyle, deputy chief executive of Acevo.
The plan, which is still being finalised, involves moving all of Acevo’s approximately 30 staff from New Oxford Street in central London to NCVO’s headquarters at Regent’s Wharf in Islington, north London.
Kyle said Acevo would be activating a break clause in its current lease and that the move would result in "significant savings", although he declined to supply figures because of the continuing negotiations with the NCVO.
"There are many shotgun marriages forced by finance at the moment, but we weren’t forced into it by financial necessity," said Kyle. "It’s a step towards working more closely together based on mutual strengths."
It was not a first step towards a merger, he said. He added that Acevo chief executive Sir Stephen Bubb had said in the past that at some point, a merger could happen, but not soon.
"There’s a lot of potential for shared services such as office costs, IT and shared reception areas," Kyle said."That might be extended to financial services in the future – we’ll see how it works out."
Kyle said the two organisations' "turbulent relationship" would continue. "The sector benefits from some of that friction, and we need to retain the good bits. Stephen and Stuart Etherington, chief executive of the NCVO, have different ways of doing things.
"This is the biggest risk that we’ve taken since I’ve been with Acevo and I think it’s a risk worth taking in the spirit of partnership."
Sir Stuart Etherington, chief executive of NCVO, said: "This move is a great example of collaborative working within the sector and strengthens our commitment to becoming an accessible hub for voluntary organisations and facilitating greater networking and knowledge sharing.
"We look forward to welcoming Acevo at Regent’s Wharf and hope to work with other partners in due course."