In the year 1906, the Mission district of St Barnabas’, Mitcham was formed as an initiative of Christ Church, Colliers Wood. An iron room was built to accommodate the services and meetings for those congregating in this area. That room became known as ‘the tin church’. However, with the construction of the church hall in 1908 and its opening by the bishop of Kingston on 23 January 1909, the services and meetings were held in the hall.
From the beginning, the church greatly benefitted from the aid of the South London Church Fund and the City of London School, whose members assisted the church personally and financially. On 17 May 1913 the foundation stone of the church building was laid and on 14 November 1914 the church was consecrated by the bishop of Southwark. According to the records of that time, ‘The church has been erected to meet the needs of that part of the parish of Mitcham which borders on Tooting and Streatham’. Then, a month later St Barnabas’ became an independent Parish.