My department does not collect data on the overall number of homes under construction at any one time.
That said, combined quarterly data on new residential planning permissions and construction activity are captured by the four Dublin local authorities in the '4Dublin Housing Supply Pipeline Monitor'. While the monitor doesn't capture the full extent of planning and construction activity across the four authorities - as it is limited to developments of ten or more units and excludes local authority own developments, social housing units and student accommodation - it gives a good indication of activity in the four areas. This data is published on a quarterly basis by my department at the following link: www.gov.ie/en/collection/ca75e-planning-initiatives/.
Separately, my department publishes the Social Housing Construction Status Report. The report provides details of social housing developments, and their location, that have been completed, are under construction or are progressing through the various stages of the design and tender processes. The Quarter 2 2024 report is available at the following link: www.gov.ie/en/collection/cb885-social-housing-construction-projects-status-reports/.