A new report from the Irish Home Builders Association also says first time home buyers are facing an affordability gap of more than 100,000 in urban areas around the country.
The report looks at the issues related to housing affordability and supply.
The average deposit paid by first time buyers is 14% of the property price.
The time it takes to save that ranges from 1.7 years in Kilkenny to 15 years in Galway City, Wicklow, Waterford, Cork and Dublin.
The association says it will now present the report to government.
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