Eastbourne Association of Voluntary Services and South Downs Council for Voluntary Service have asked stakeholders whether they should come together to form one organisation covering three local authority areas in East Sussex.
Adam Chugg, chief executive of Eavs, said the move was motivated by a desire to improve services for local groups rather than by concerns about funding.
"We want to maintain and improve our services, and we think this structure will do that," he said.
The two organisations employ about 20 staff between them. The consultation will run until March.