My Department has not been required to carry out a disability impact assessment, but should the requirement arise, an assessment will be carried out as required by the Cabinet Handbook.
Guidelines on how to complete a Disability Impact Assessment can be found on Dept. of Justice site here: http://www.justice.ie/en/JELR/Pages/PB12000078.
There are 4 agencies under the aegis of my Department: Pobal (Pobal is not classed as an agency for the purposes of the Disability Acts), the Charities Regulatory Authority, Water Safety Ireland, and the Western Development Commission. Disability impact assessments are a matter for the relevant boards and management of those agencies as they are independent entities who manage their own corporate affairs and staffing issues.