Statistics in relation to the social housing stock of local authorities are gathered by the National Oversight and Audit Commission (NOAC), in their annual reports on Performance Indicators in Local Authorities. These reports provide a range of information in relation to social housing stock, including the total number of dwellings in each local authority area.
The most recent NOAC report covers the 2015 period and is available at the following link: http://noac.ie/wp-content/uploads/2016/12/2015-PI-Report.pdf. Prior to NOAC's work in this area, the Local Government Management Agency (LGMA) published Performance Indicator Reports from 2004 to 2014, which are available on their website at the following link: http://www.lgma.ie/en/serviceindicators/2004to2013.
My Department does not record details of the number of houses owned by approved housing bodies. However, details on the number of accommodation units delivered by approved housing bodies under my Department's Capital Assistance Scheme, Capital Advance Leasing Facility and the Capital Loan and Subsidy Scheme since 2010 are available on my Department's website at the following link: http://www.housing.gov.ie/housing/social-housing/social-and-affordble/overall-social-housing-provision.