The tower is round and of C12 or earlier.
It has C13 pointed windows at belfry level and below on the west side, and a plain tower arch perhaps also remodelled in C13.
The nave has Norman walling
possibly of C13 origin but may be rebuilt in C19.
Early C16 porch in pink/buff brick with plaintiled roof.
C12 font with cauldron-type bowl on a chamfered square stem.
TM0159 : St John the Baptist, Onehouse - Font
Around the rim, 4 carved defaced figures have their arms outstretched to link hands.
The chancel of early C19 is of flint rubble with many inclusions of moulded medieval limestone.