The church has a single-cell nave and a semi-circular apse preceded by a straight bay. Romanesque sculpture is found on a capital reused as a piscina. The church also contains a plain font.

Upwaltham is mentioned in DS. Troarn Abbey held some land there, but no church is mentioned.

The volute capital is very similar to ones in Chichester Cathedral, and is more likely to have been brought from there than to have come from the Upwaltham site.