The government failed to meet its target for social housing last year.
The Department of Housing says more than 4,000 social homes were built in 2018, which was 4% below target.
However, the rate of construction last year was 85% higher compared to 2017.
Roughly one in four homes built last year was for social housing.
The Housing Minister says it's a sign their plan is working - but acknowledged much more needs to be done.