West Blatchington church fell into disrepair in the 18thc. and was rebuilt in 1890 with a nave, chancel and vestry. The foundations of the W end of the nave, which extended beyond the present building, have been uncovered. A N aisle was added in 1961-62 to a design by J L Dedman. In 1973 the VCH mentioned the presence of fragments in the N wall. These are no longer visible and were probably removed in 1961-2.

By 1596 West Blatchington church was used only as the chapel to the local manor house. It fell into ruin in the 18thc. and was rebuilt in 1890. The N aisle was added in 1961-62. According to the VCH (1973): 'built into the interior face of the north wall, opposite the S door, are a number of architectural fragments, including portions of a 12thc. arch showing roll-and-billet mouldings, portions of tracery, and what appears to be part of a medieval grave slab'. These stones were found in the ruins approximately between the nave and chancel, and are thought to be the remains of the chancel arch. The stones are no longer visible, and were presumably removed when the N arcade was erected in 1961-62. The VCH entry may have been prepared many years before publication, and it is significant that the plan accompanying the article does not show the N aisle. The current location of the stones is not known.