Selmeston Church is Grade II listed and built of flint in the typical Sussex style with a red-tiled roof and a tall bell turret with tiled walls and a shingled spire. The dedication is unknown. It was largely reconstructed in 1867 by the then vicar, Chancellor W.D. Parish under the direction of the architect, Ewan Christian, and very little of the original building remains. The Domesday Book, however, records that there was a church here served by a priest, whose patron was William de Cahanges, the Lord of the Manor.
In the 12th century the patronage was transferred to the Bishop of Chichester, who attached it to the cathedral prebend of Heathfield to which it still belongs. The list of vicars dates from 1350 and the registers from 1667.
The churchyard is circular and contains the gravestone of Frederick Stanley Mockford (1897-1962) who was the inventor of the "Mayday" distress call in 1923. He was a senior radio officer at Croydon Airport in London and was asked to think of a word that would indicate distress and would easily be understood by all pilots and ground staff in an emergency. Since much of the traffic at the time was between Croydon and Le Bourget Airport in Paris, he proposed the word "Mayday" from the French m'aider. "Venez m'aider" means "Come help me".
At the East end of the south aisle there is a "brass" with the following wording:
The body of Henry Rogers a painfvll Preacher in this churche two and thirty yeeres who dyd the sixt of May Ano dni 1639, and in the yeere of his age 67 lyeth heere expecting the Second Coming of Our Lord Jesus Christ. I did beleeve and therefore spake Whereof I tavght I doe pertake. Henry Rogers
Today "painfvl" would be better understood as "painstaking" or "industrious".
The small South aisle is separated from the nave by a timber arcade of three bays supported on two octagonal wooden pillars resting on modern stone bases. It is early 15th century, but has been considerably restored. Such arcading is unique in Sussex churches.
The altar has its original marble slab with five consecration crosses; while there are also in the Sanctuary a 13th century piscina and two modern corbels, one praying and the other playing a harp. There is a medieval holy water stoup in the modern porch.
The beautiful stained glass windows in the church are mainly copies of the originals: the East window being of the Decorated and the rest of the Perpendicular period. The Annunciation window is by Charles Kempe.
In front of the chancel is a ledger stone with the inscription:
"Ann Widow of William Cox of Stanstead in the county of Kent, and daughter of Robert and Elizabeth Rochester. Died 1741, aged 57 years".
On the North wall is a monument of 1532, which was originally used as an Easter Sepulchre, and contains the following lines on the back:
"Here lyeth Dam Beatris Braysvm tyme the wyffe of Syr Edward Bray and dawgter of Ratte Sherley of Wyston and wyffe of Edward Elderton".
Also on the North side is an inscribed ledger and brass belonging to the Caldicott family, who held Sherrington Manor from the 17th to the 19th century. Other ledgers aare inserted into the vestry floor, one of which has the curious wording:
"Here lyeth ye body of Henry Rochesterd Dyed May 28 1646. Apostrophe AD Omnes. This life that's packt with ielovsies and fears I love not. That's beyond the lists of fears. That life for me. For here I cannot breathe my prayers ovt. There I shall have breath to say Ovr Father that's in heaven wth me where chores of sancts and innocents there be Christianos. No sooner christened bvt possession I took of the heavenlie habitation."
The church possesses a silver communion cup dated 1632 and inscribed "William Wenham his gift", a silver paten cover of the same year, and a silver flagon of 1674 with the words "altare sanctificat munus" on its lid.
The church has a wonderful set of embroidered kneelers - both at the altar rail and in the pews.