The New Beginning group says the "devil is in the detail" of proposed legislation aimed at helping tenants.
It has been reported new laws could be put forward preventing banks and receivers from evicting people from buy-to-let properties if they have nowhere else to go.
The legislation would impose a "duty of care" on them with regard to tenants in buildings in the sector that are subject to repossession orders.
Barrister and co-founder of New Beginning, Ross Maguire, wants to know who would decide whether someone can move to another home.
He said: "It's a remarkable piece of legislation, if it's accurate. What it's saying is, what the Irish Times are reporting, is that the receiver would have to look at the tenant and say 'I am not going to put that tenant out unless I am satisfied that tenant has alternative accommodation'.
"Who decides that and what does that mean?
"I think the devil is in the detail in this legislation."