In its research on inter-jurisdictional and cross-border planning, the International Centre for Local and Regional Development (ICLRD) has shown how one of the first entry points to developing cooperation is providing information and shared evidence on common issues such as housing, trade, environment, transport and services. The process of collection, joint analysis, reports and forums can help to build an agenda for action around common interests and challenges. Today, one of the major challenges within the Irish economy and society (North and South) relates to issues within the housing market. The All-Island Research Observatory (AIRO) at the National Institute for Regional and Spatial Analysis (NIRSA), has developed an interactive mapping and querying tool for housing market indicators combining data from both Northern Ireland and The Republic of Ireland. By facilitating access to comparable statistics, the Island of Ireland Housing Monitoring Tool can be a key step towards addressing common difficulties in the housing sector. This on-line housing atlas is one of three spatial data indicators projects undertaken by AIRO under ICLRD’s Cross-border Spatial Planning and Training Network (CroSPlaN).