It is not in an emergency homeless shelter, but usually a room or apartment in a residence with support services.
But, due to the on site services, transitional tends to be more expensive than permanent supportive housing.
[1] In the USA, federal funding for transitional housing programs was originally allocated in the McKinney–Vento Homeless Assistance Act of 1986.
[3][4] In Hong Kong, as part of the Chief Executive of Hong Kong’s policy address in 2018, a Task Force on Transitional Housing was set up under the then Transport and Housing Bureau to actively assist and facilitate various short-term initiatives proposed and implemented by the community to increase the supply of transitional housing.
[5] An example of Transitional Housing designed specifically for youth is the Foyer model.