Thrapston House

Thrapston House is a town house, now an office, dating from circa 1805. A rainwater head dated 1842 indicates an extension and remodelling of the front entrance during that time. The building is constructed of squared coursed limestone, with an ashlar facade and a plain-tile roof. It follows a double-depth plan and stands two and three storeys high.

The main front features a three-window range. A central ashlar porch has square and reeded columns, a dentilled cornice and a six-panel door. The windows are tripartite sashes with ashlar surrounds and keyblocks. A raised string course, dentilled wood cornice and ashlar gable parapets complete the facade. Attached to the left is a two-window range with a rainwater head dated 1842 set above sash windows with ashlar surrounds; the first-floor windows have keyblocks. This left bay breaks forward slightly. The rear elevation is likely from the early 19th century, displaying a three-window range of sash windows with glazing bars under gauged stone heads. The second floor incorporates a five-window range and some replacement windows. The central bay breaks forward on the ground and first floors, featuring a gabled roof and a large central sash window leading to the staircase. A single sash window with glazing bars is set within the left gable, beneath a wooden lintel.

The interior includes a mid-19th century staircase with square balusters. It is included on the list for its group value.