The number of new homes built in July, August and September of this year was 9,235, a rise of 4% on the same period last year, according to the Central Statistics Office.
Apartments were up 3%, homes in estates increased by 1% and one-off houses rose by 15%.
Over a third of completions, or 36%, were in Dublin with 19% in the Mid-East region.
The local electoral area with the most completions in the third quarter of 2025 was Clondalkin in Dublin.
Today's CSO figures show that the commuter belt of Kildare, Meath, Louth and Wicklow had a 35% rise in new residential properties.
When the figures for the third quarter are adjusted for seasonal factors it shows the number of new completions was down 4%.
However, when the data for the first nine months of this year is compared to the same time in 2024 it shows a stronger increase.
"In the first nine months of 2025 there were 24,325 new dwelling completions, which was an increase of 13% on the same period in 2024," the CSO's statistician Steven Conroy said.
"Apartment completions between January and September 2025 were up 30% when compared with the same period in 2024," he added.
Commenting on today's figures, Trevor Grant - the chairperson of Irish Mortgage Advisors - said that after a promising second quarter, there was a muted start to home building in the second half of the year.
Mr Grant said the country needs an "exponential" increase in the number of new homes being built in Ireland.
"Second-hand home stock levels have fallen to record lows and not enough new homes are coming on board. The biggest driver of Irish house price inflation is the shortage of homes coupled with the pent-up demand for housing and an expanding population," he said.
"Without a significant boost to housing supply, steep house price inflation will persist and homes will continue to be unaffordable for a large cohort of young people as well as the many others who wish to buy," he added.
