People in Cornwall are getting only a "fair" housing benefits service, the Audit Commission says.
Cornwall Council was given one star out of a possible three in a new report about it benefits section - which also includes help with council tax.
The report said there were weak performances in some key areas, such as how long people had to wait.
The council was praised for its work when the county became a unitary authority in 2009.
The commission said it had made several recommendations for improvements.
It said the council should work towards providing better value for money.
The commission said the council handled housing improvement grants well.