The set up costs of the Homes and Communities Agency (HCA) and Tenant Services Authority (TSA) are set out in the Housing and Regeneration Bill-Impact Assessment, a copy of which is in the House Library
http://www.communities.gov.uk/publications/housing/housingregenactimpactassess
The running costs for both the HCA and the TSA can be found in the published financial statements for 2008-09.
http://www.homesandcommunities.co.uk/annual-report-2009.htm
and
http://www.tenantservicesauthority.org/server/show/ConWebDoc.19672