Parish Church of St Denys

The Parish Church of St Denys is a Grade I listed building located in Sleaford's Market Place. The tower dates from around 1180, with a spire added around 1220, making it one of the earliest examples of stone broach. The tower was rebuilt in 1884 after being struck by lightning. The church features a 14th-century Decorated nave and aisles that extend westwards, along with a large north transept. A clerestory was added around 1430, and the chancel was remodeled during this period. In 1853, an outer north aisle was added by architects Kirk and Parry, who reused old windows. The church is noted for its impressive mid-14th-century tracery and ornamentation, including a series of carved corbels and heads in the nave depicting a Turkish man and woman.

Inside, there is a medieval Rood screen that retains the original platform and pulpitum, with a balustrade and Rood restored by Sir Ninian Comper in 1918. The communion rail, believed to be by Sir Christopher Wren, was originally from Lincoln Cathedral. The church also features a decorated font that has undergone significant repairs, a piece of 17th-century Sheldon tapestry in the north aisle, a 17th-century dole cupboard, and a desk with 15 chained books.

The church has a peal of eight bells, cast in 1796, and contains Carre monuments. A 15th-century window, which was removed from the west front during the 1884 restoration, has been reconstructed and now stands at the east end of the churchyard. The Parish Church of St Denys, along with the Vicarage, Lock-up, War Memorial, and Nos 7-12, forms a group of historically significant buildings.