An estimated 10,000 new affordable homes are needed in Devon in the next five years, a housing study has found.
The Exeter and Torbay Housing Market Assessment study looked at population trends and the housing needs of different groups.
It said new houses in Exeter, Torbay, mid-Devon, Teignbridge and east Devon must be affordable for those who are not currently able to buy or rent.
The study said an extra 19,200 properties will be needed overall.
The study identified that 7,200 properties should be provided as social rented homes and another 2,800 as intermediate affordable homes.
It said better use could be made of existing homes by encouraging owners to downsize to smaller properties, thereby releasing larger housing stock.
The study also recommended local authorities, the development industry and landlords work together to meet demands in a more balanced way.
It said problems were identified with the condition of 21,800 homes across the Exeter and Torbay areas, of which 8,100 are unlikely to be brought up to an acceptable standard without investment or intervention.
Chairman of the South West Regional Housing Body and Teignbridge District councillor Alan Connett said: "We haven't built enough to keep pace with demand and that's built up the problems we face nowadays, so we are going to take some time to build ourselves out of the difficulties we've got."
The study was jointly commissioned by Exeter City Council, Torbay Council, Devon County Council, the Dartmoor National Park Authority and the District Councils of East Devon, Mid Devon and Teignbridge.