W. Barker, a long-serving minister in the 19th century, revived the church after it was split by a secession and later helped to establish Baptist chapels in two other parts of Hastings.

The church forms the northwest corner of Wellington Square, one of the town's earliest residential developments, and its stuccoed Neoclassical exterior harmonises with the surrounding houses.

Development of Wellington Square began in 1817, two years after the land was bought by the Hastings Bank—a local financial institution owned by Messrs Breeds, Farncomb and Wenham.

Work started in the southeastern corner of the site, initially called Wellington Place, and continued until well into the 1820s.

[2][3][4] A group of friends began to meet for worship in 1836, initially in a hired room in Waterloo Passage near the High Street in Hastings Old Town.

[7] Around 1864 a secession occurred which caused Wellington Square's minister at the time to leave and set up a new church, the Memorial Chapel.

[10] The secession took away many members of the church and left its membership very low: for a time "things were in such a bad state" that it was decided to close and sell the chapel, but under new minister Rev.

[5] Under his ministry the church was responsible for founding a Baptist mission hall in the Halton area of Hastings.

[19] Wellington Square Baptist Church remains in use for worship and by a wide range of community groups.

At ground-floor level is a projecting porch with a side entrance, central window and two pairs of plain pilasters.