Montague House

Montague House is a town house that has been converted into offices and a surgery. It has origins dating back to the 17th century, with significant alterations made in the mid-18th century and mid-19th century. The building is constructed from squared coursed limestone and brick, topped with roofs made of Collyweston slate, Welsh slate, and concrete tiles. Originally, it likely had a three-unit plan, which was later modified to a U-shaped layout.

The structure stands two storeys tall with an attic and features a six-window range of irregularly spaced unhorned sash windows with glazing bars, all set beneath wooden lintels. To the right of the centre, there is a 20th-century six-panel door framed by a moulded stone architrave and a plain entablature with a cornice above. A 19th-century six-panel door on the far right has been partly glazed and is topped with a 20th-century wooden hood. The building also has three flat-topped roof dormers, with the leftmost dormer featuring a leaded casement window with crown glass. The gable ends are finished with ashlar parapets and kneelers, and there are brick stacks at the ridge and ends.

No. 3/5, which is painted, has a concrete tile roof. A mid-19th-century brick extension attached to the right of No. 3/5 features a two-window range at the first floor and a three-window range at the ground floor, all of which are sash windows with glazing bars under shallow brick heads. The centre window of this extension was originally a door. The rear elevation includes two projecting gabled wings from the 18th century, along with 19th-century additions. The sash windows on the rear are similar to those on the front, with some first-floor windows being early examples of sashes with wide glazing bars.

Inside Montague House, there is an 18th-century staircase with a quarter landing and three turned balusters per tread, as well as a fielded panelled dado in the entrance hall. The interior of No. 3/5 retains remnants of an open fireplace with a bressumer to the left of the entrance, along with evidence of the external corner of the original house before the 18th-century wings were added to the rear. Montague House is noted to have been the home of Sir John Washington, who served as Mayor of Thrapston in the 17th century and was an ancestor of George Washington. His arms, which are now located in the Church of St. James, are said to have originated from this building.