The number of homes to rent nationally has reached its lowest level since 2006.
According to the latest quarterly rental report from Daft.ie just 2,700 homes were available to rent nationwide on 1 May this year.
The shortage of supply has pushed up average rents across the country to €1,366 a month - up over 8% year-on-year.
While the increase in Dublin was less than 7%, in Cork, Galway, Limerick and Waterford rents increased by 10% to 15% over the last year.
Rents have increased by an average of 12% in Connacht this year over last.
Average monthly rent in Dublin is at €2,002, in Mayo its 730 euro, in county Galway 900 euro, in Sligo 760, and in Roscommon 700 euro.