Citizens Advice has said an extra room "can be a lifeline" for a disabled person, calling it "as vital as a guide dog or a wheelchair".
Chief executive Gillian Guy said for many people a spare room "is essential to their wellbeing" as it is needed for dialysis equipment or room for a carer.
Ms Guy said: "Many sick and disabled people have bedrooms which have been adapted to help them to cope with their condition.
"Moving disabled people out of their houses is not only a potential risk to their health, but can cost the individuals affected and councils significant amounts of money if they need to start from scratch in a new home."
More top news
Lavinia Woodward attacked her Cambridge-educated partner at her university accommodation in December last year.
Labour's election pledge is its most symbolically powerful break with the economics of Tony Blair and Gordon Brown - but will it save money?
Ross Brennan, 28, conspired with Aarron Gledhill, 30, to import and sell powerful class A drugs to thousands of customers.