Fianna Fáil's spokesperson on Housing Darragh O'Brien has described new rules to crack down on property owners violating Airbnb regulations as a "miserable failure".
The rules have been in place since 1 July and were designed to increase the volume of housing stock available in the private rental market.
The regulations focused on areas where the crisis is most acute, like Dublin and Cork, and require anyone with a second property that is being used for short-term lets only to seek planning permission from their local authority.
Those renting out their primary residence for more than 90 days per year must also seek planning permission.
New figures uncovered by Mr O'Brien, show that only 3% of eligible Airbnb properties have registered under the new rules.
Speaking on RTÉ's Today with Miriam O'Callaghan, he said the regulations are not being properly implemented.
"That's about 14,500 homes. As of the week before last, 417 applications had been made, which is less than 3%. It's a miserable failure. It's an example of big fanfare and press releases not followed up with actual implementation".
Mr O'Brien said that despite being told additional staff and resources would be provided to ensure the regulations were enforced, only three new staff have been appointed, all of whom are in Dublin.
He said a number of local authorities around the country have had no applications for Airbnb planning permission.
He acknowledged that short-term lettings and Airbnb type platforms "have a place here" and are "important for our hospitality sector", but said he doesn't believe the Government was serious about tackling problems in the sector.
"The issue is about housing. The vast majority of people falling into homelessness are coming through the private rental sector. Many different things needed to be done, like supply, affordability and more social housing".
Mr O'Brien said he believes the Minister for Housing "rushed it" because he was "feeling a bit of heat".