It is a relatively modern area with housing stock dating mainly from the late 1980s and beyond. The area has a centralised precinct providing services, comprising a community centre, a Sainsbury'ssupermarket, with an integral Post Office and Pharmacy; and a Medical Centre. There are three public houses located in Thornhill: the Old Cottage, Pendragon, and the Ffynnon Wen. Though on Thornhill Road, The Traveller's Rest to the north is on Caerphilly Mountain and in Caerphilly based on its postcode and council locale. Thornhill Cemetery is a major cemetery located adjacent to Thornhill, in Rhiwbeina. Thornhill crematorium was built on this site during the 1950s as a dedicated crematorium. This differs from the crematorium that was set up in nearby Glyntaff; this in contrast was a chapel that was originally used for traditional burials and modified to serve as a crematorium. Most of Thornhill's residential development took place during the 1990s, Cardiff Council originally planned Thornhill as "The Villages of Thornhill"; with clusters of houses interspersed by large "green" areas. These green areas were short lived as rapid housing development resulted in homes being built in areas adjoining the "Villages". Thornhill also houses a few tucked away historical sites including the remains of a castle situated close to the Caerphilly/Thornhill border known as Castell Morgraig.
Transport
Thornhill is served by Lisvane and Thornhill railway station which replaced Cefn Onn Halt railway station which closed in 1986. bus on Service 27 Thornhill is served by bus services operated byCardiff Bus,. The 27 and 28 service runs through Thornhill and terminates at the Central Bus Station at regular intervals. NAT Group have its X8 services, running from Thornhill to Cardiff city centre and onto Cardiff Bay. Stagecoach service 25 follows a route along Thornhill road on its way to the University Hospital of Wales and Cardiff City Centre. This service replaced the A and B services in 2017. Stagecoach Wales have operated the 86 service since 1 April 2019 after Cardiff Bus withdrew from the route. Cardiff Council tendered for a new operator for two years after designating the 86 service as one of several new 'socially necessary' routes in Cardiff. The M4 motorway passes Thornhill between junctions 30 and 32.
