The oldest part is the Nave which dates to around the 12th century. Over the next 100 years, the Chancel was built; it later received various alterations and refurbishments in the 1400s. The three-stage west tower was the last stone section of the building to be built, in around the 1300s. The building has a wooden south porch which dates to the 1400s. At around the same time, the north aisle and clerestorey were added. There were numerous repairs made in the 1600s and further refurbishments carried out in the 1800 and 1900s, most notably by the English architectSir Charles Nicholson. The stone work is predominantly ashlar, rubble, flint and has some Roman brick. The building has a central moulded hammer beam roof with moulded arched braces and is covered by red plain tiles. The tower has clock faces to the north and south walls.
Interior
The Chancel has a roof of four bays, four armed octagonal crown posts with moulded capitals and bases. There is a piscina which dates to the 1400s. Most of the stained glass dates to mainly the 1800 and 1900s and was designed by Nicholson's brother, Archibald, however there is some medieval glass to east and north west windows. The panelling to the choir walls were designed by Charles Nicholson with decoration by his mother. Nicholson also designed the traceried screen and features decoration by his daughter, Barbara. There is a font, the base of which dates to the 1200s, with a much later bowl. The pulpit is from the 1900s. The church organ was built to the designs of Nicholson's younger brother, Sidney who later became the organist at Westminster Abbey and founder of the Royal School of Church Music.
Churchyard
Sir Charles Nicholson, who died in 1949, is buried on the south side of the west tower in a family plot that also contains both his wives, Evelyn Louise, Olivier, who predeceeced him and who was an aunt to the actor Laurence Olivier, and Catherine Maud Warren. Other monuments include a table tomb from the 1720s which belongs to James Matthews, a local farmer and hoyman. The inscription reads "Sixty three years our Hoyman sailed merrily around. Fourty four lived parishioner where he's aground. Five wives bear him thirty three children. Enough, land another as honest before he gets off." The monument is listed at Grade II, as are a group of four, 1800 headstones to Catherine and Robert Hewson ; Mary Nash ; and John Greenway. The stones are around 18 and 22 meters south east of the south porch. Just adjacent to the church yard, at the junction of Essex Way and the High Street, is the Grade II listed South Benfleet War Memorial, also designed by Nicholson.
