Delays in planning appeals are hiking costs
The majority of planning appeals are not being dealt with in the required 18-week time frame.
An Bord Pleanála has a "statutory objective" to determine planning appeals in that time frame.
However, a backlog in cases has led to delays, despite the ongoing housing crisis.
Details provided to Fianna Fáil by the Department of Housing show that at the end of October the compliance rate for normal planning appeals was 38pc.
Meanwhile, for all planning cases it was 43.5pc.
If the 18-week deadline is not able to be met, the board must contact the parties involved and indicate when a decision will be made.
Housing Minister Eoghan Murphy noted that problems including a staff shortage on the board and a significant increase in the number of cases it is dealing with have contributed to the delays.
But he insisted the level of funding and the replacement of board members means the board is fully resourced and said its output is now at around 250 cases per month.
Fianna Fáil housing spokesperson Darragh O'Brien said: "I have been contacted by several builders about undue delays that are frustrating their plans to put bricks and mortar in the ground.
"These lengthening delays are hiking up costs for builders and preventing badly needed homes from being delivered," he added.
The party is calling for extra board members and a reduction in the quorum for decisions on smaller developments to speed up the process.