Builth Wells is a market community and neighborhood in the area of Powys and historical region of Brecknockshire (Breconshire), mid Wales, existing at the confluence of rivers Wye as well as Irfon, in the Welsh (or upper) part of the Wye Valley. It has a population of 2,568. A lot of the town's structures, including the 1876 Market Hall, were constructed from rock from Llanelwedd Quarry. Much of the facing as well as various other clothed rock made use of in the building and construction of the Elan Valley dams was also quarried here. The quarry generated the first occurrence of laumontite in Wales. The quarry is presently operated by Hanson Aggregates. Builth is a longstanding anglicization of the Old Welsh Buellt/Buallt which combines bu be, equivalent to some Middle English orthography), implying "ox" with gellt (later gwellt), indicating "lea or leas"; the exact same form is made use of no matter sex of the pet. The town added "Wells" in the 19th century when its springs were advertised as a site visitor attraction. Its modern Welsh name Llanfair-ym-Muallt means "Saint Mary in Ox Leas".