Until the 1940s the houses and farms of the Llanuwchllyn area were part of the Glan-llyn estate owned by Sir Watkin Williams Wynne. Glan-llyn Hall (Y Plas) was used as a 'shooting box' by Sir Watkin's friends, and Glan-llyn Isa' was the estate steward's home, with estate tenants going there to pay their rents.

When Glan-llyn came into the care of Urdd Gobaith Cymru in the 1950s, Glan-llyn Isa' was used as accommodation for boys (with the girls sleeping at the Plas) From the 1960s onwards Glan-llyn Isa' was used as a home for Glan-llyn staff and their families, and over a period of over 50 years many scores of centre staff have lived there. 

Bringing Glan-llyn Isa' back into residential use will bring the building back to its first use by the Urdd in the early days of Gwersyll Glan-llyn.