Together with the introduction of welfare caps on large families, Dent is concerned about moves to uprate local housing allowance payments with the consumer price index (CPI).
It is feared that when the policy is introduced in 2013, it could leave families worse off than under the current system, which increases payments based on local rent price increases.
She said: "These changes to the small print on housing benefit could mean some families and children are on the move for a lifetime.
"With average rental increases outstripping CPI for the past decade it’s not hard to imagine generations on the move, always seeking cheaper accommodation as rental increases bite into family income and housing support fails to cover these increased costs.
"The planned welfare cap will only add to the struggle to find affordable accommodation that many large families already face."
