St Peter's was built between 1824 and 1827 during the first development of Eaton Square. The interior was, as was common at the time, a "preaching box", with galleries in three sides and the organ and choir at the west end. James Elmes called the effect "chaste and simple". This building burnt down, and in 1837 was rebuilt from Hakewill's drawings by one of his sons. The original building was a Commissioners' church, receiving a grant from the Church Building Commission towards its cost. The full cost of the building was £22,427, towards which the Commission paid £5,556. In 1875, the church was enlarged and reordered to designs by Sir Arthur Blomfield, who added a chancel at the east end and north and south transepts and "fiercely normanized" the interior. Internally Blomfield's chancel and transepts are Romanesque Revival, but externally they conform with Hakewill's neoclassical style. From its founding St Peter's, Eaton Square, Pimlico and until at least 1878 was usually recorded as St Peter's, Pimlico. In 1953 the crypt containing some 400 burials was cleared and the remains reinterred at Brookwood Cemetery in Surrey. Choristers for the choir were provided by until 1958 when the choir school closed. On 20 October 1987 an anti-Catholic arsonist set fire to the east end, in the mistaken belief that the building was a Roman Catholic chapel. Within hours the church was engulfed. By the next day the fire was out but only the Georgian shell of the building remained. It was roofless, with most of its furnishings destroyed. The church needed total rebuilding. The Braithwaite Partnership of architects was appointed to completely redesign the building with a new and simpler interior, and to incorporate within the site a vicarage, offices, flats for a curate, verger and music director, a meeting hall, nursery school rooms and a large playroom for the church's youth club. Work on the new church began at Easter 1990 and was completed in 1991. It retained the grand Georgian portico but beyond that the interior is described by visitors as clean, bright and modern. The choir and organ are at the west end, as in the 1827 plan, but the fittings are thoroughly modern. The church is accessible and has disabled-accessible toilets. Behind the altar is an apse that is decorated entirely with gold mosaic. Around the side of the apse, part of the 1873 sanctuary which survived the fire can be seen, and also a side chapel now used as the vestry office, complete with stained glass.
