Pupils and staff of St Nicholas NS in Nicholas Street are looking forward to the completion next year of a €3 million extension to the school.
Work began in February and is expected to be finished in April 2022.
On the ground floor of the two-storey extension to the front of the original building will be a special needs unit for children with autism, with three new mainstream classrooms overhead.
The development also includes a sensory room and sensory garden.
At the moment pupils are accommodated across three sites. Junior Infants, Senior Infants and 1st Class remain in the school, while 2nd to 6th Classes have moved to Wellington Hall.
The Autism Classes, Infants and 1st Class returned on 22 February, followed by 2nd to 6th on 1 March.
The autism unit, The Haven, is housed in a prefab on the adjacent Coláiste Rís playing fields, where it has been for the last couple of years.