A side hall was later added to the main church building in 1877, followed by an ornate belfry replacing the previous simpler steeple in 1879. In 1900 the church became part of the United Free Church of Scotland, when the majority of Free Church and United Presbyterian Church of Scotland congregations united. The Rev. Morgan continued to lead it until his death in 1910. Following passage of the Church of Scotland Act 1921 and the Church of Scotland (Property and Endowments) Act 1925, in 1929 the Viewforth Church became a Church of Scotland congregation, when most United Free Church congregations joined that denomination. In 1973 Viewforth merged with Viewforth (St David's and St Oswald's), and a new minister was ordained and inducted to the united charge, which in 1981 became known as the "Viewforth Parish Church". The St David's Viewforth buildings where the former had been meeting were sold to Newcastle Breweries (owners of the McEwan’s Brewery site) and demolished for redevelopment. Viewforth (St David's and St Oswald's) was itself a product of the 1957 merger between St Oswald's Parish Church (located in nearby Montpelier Place) and Viewforth St David’s, with both buildings remaining in use for worship until 1963, when the St Oswald's church and hall buildings were sold to the local Education Authority, use which they retain to the present as the "Boroughmuir High School Annexe". The belfry section of the steeple was removed in 1976 due to its precarious condition, leaving it with its current "truncated" look. In 2009 the congregation combined with the nearby Church of Scotland Barclay Bruntsfield Church, moving into their premises to form the Barclay Viewforth Church. The following year the building was purchased by the Kings Church Edinburgh, an evangelical church part of the Newfrontiers group of churches.