Ysgol Gynradd Gymraeg Lôn Las opened on 5 September 1949 (officially opened on 12 September) in Ebenezer Chapel's school room in the Llwynbrwydrau area, in the eastern most part of the borough. The school was the Borough of Swansea's first Welsh-medium school. The authorities expected 57 children but 71 turned up. Lôn Las has its roots in the Nonconformist chapels' efforts, with Cyngor Eglwysi Rhyddion Treforys (CERT) being the first organisation to specifically ask and demand from Swansea Primary Education Committee for a Welsh language primary school in the area. In May 1948 Swansea’s Education Committee decided to establish its first Welsh language school, with Lôn Las opening a year later. Many of the teachers for the first 30 years at Lôn Las were members of local chapels in Morriston, and so one could possibly view Lôn Las as a Welsh Christian school as such. The school later moved into brick school premises on Frederick Place (SS7035597217 - built likely early 20th Century, demolished in 1995) and moved to current location on Walters Road in the early 1990s.

The school building on Walters Road was built in 1927 by contractors Messrs John Goodridge & Sons, Neath as Llansamlet Mixed and Infants School. The school was designed by Borough Architect Ernest Morgan as an open air school in a figure 8 shape with two quadrangles and an assembly hall in the middle. Officially opened on 3 June 1929. Cost of build £15,700. Walters Road school first appears on OS 25-inch Fourth Edition (1928-1943) and OS 6-inch Fourth Edition (1927-1954). These buildings have now been demolished to make way for a new build under Welsh Government's 21st Century Schools Programme. The new school is a split-level design with the main reception and administrative areas at the front of the school. The classrooms are on the top level designed in a horseshoe around a central courtyard play area. New school opened in 2017. Cost £9.8m. In 2018, there were 482 pupils between 3 and 11 years old on roll, including 70 part-time nursery pupils.

M. Powel, RCAHMW. April 2024.

Sources: 'School Stones Saved', South Wales Evening Post, 7 May 1996; Trevor Lloyd Evans,‘Ysgol Gymraeg Lon-Las, Abertawe yn 25ain Oed Medi 1949-Medi 1974’. EDU64, West Glamorgan Archive Service; 'A £9.8m brand new school opens in Swansea on Tuesday for pupils returning from the Easter break', Wales Online, 30 April 2017; OS Historic Mapping.