Check what building cover you need
The Society of Chartered Surveyors Ireland (SCSI) has a handy re-building cost calculator on its website: You just need to put in the information pertaining to your property and it will give you typical rebuild costs.

For example, a typical 4-bed semi-detached house (1,500 sq ft) in the Cork area would cost €194,600 to rebuild. If it has a garage attached, then you can expect to pay an additional €13,730 to rebuild.

The same property would cost €247,520 to rebuild in Dublin, or €169,960 in the north-west region.