As the population of Bishop’s Stortford grew in the first half of the nineteenth century, it was decided to carve out two new parishes from the original parish of St Michael’s and new churches were provided for these.  Thus, All Saints Church at Hockerill was opened in 1851, followed by Holy Trinity Church, on South Street, in 1860, to serve the New Town and southern end of Stortford.

Holy Trinty was on a more modest scale than All Saints, with a sitting capacity of 200.  It was designed by the noted ecclesiastical architect, Joseph Clarke.  He was the local diocesan architect and had already designed Hockerill Teacher Training College which had opened in 1841.  The church is built of Kentish ragstone, in an Early English style, with a chancel, single nave and belfry.  There were plans in 1896 by the Stortford architect George Pritchett, to expand the church but these did not proceed.  There was, instead, a more limited extension at the rear of the church, adding a wrap round extension, by the noted church architect Sir Arthur Bloomfield.

A small school room, New Town Infants, had already been built at the rear of the site, opening in 1852. This provided temporary accommodation for the congregation whilst the church was being built, was then used as a church hall and is now the Holy Trinity Night Shelter.  A small cottage was also built in the grounds, to provide accommodation for the school mistress.