Old Borough House

Old Borough House is a house, now operating as a guest house, dating from around the early 17th century. It has undergone several phases of extension and alteration in approximately the mid-17th century, late 18th century, mid-19th century, and mid-20th century. The building is constructed of slate stone rubble with a rag slate roof. Gable ends are present on the range set back to the left and on the cross wing to the right; the central range has a hipped end to the left, and the rear of the cross wing a hipped end and gable end. Stone axial stacks are visible, originally a rear lateral stack to the rear of the central range. Other stacks feature stone rubble with a brick shaft on the front gable end, on the rear hipped end of the cross wing, and a projecting stone rubble stack to the gable end of the rear wing.

The original plan has been significantly altered. The original house likely comprised at least a three-room layout, with only the central room surviving, originally heated by a rear lateral stack. The lower end to the left was probably rebuilt in the 19th century, and the higher end to the right has only part of the front wall remaining, now incorporated as a cross wall within the right-hand cross wing, which is set back and out of alignment with the central range. Around the mid-17th century, a likely kitchen wing was added to the rear of the central room, featuring a gable end stack. In the late 18th century, a cross wing was added to the right of the central room, replacing a probable earlier inner room, with a two-room plan and end stacks. In the early 19th century, the lower end to the left was probably rebuilt as an outbuilding, later remodelled in the mid-20th century to become part of the house.

A further service range was added in the late 18th century on the upper, right-hand side wall of the rear kitchen wing, spanning over a well. This range was remodelled in the mid-19th century, with the removal of the roof, a further range added on the upper right-hand side, and the 18th-century range becoming a courtyard. In the mid-20th century, the courtyard was roofed and incorporated back into the house. The building is two stories high. The front elevation has a regular two-bay arrangement, with a recessed range on the left and a gabled cross wing on the right. The left-hand range has a part-glazed 20th-century door, a 12-pane sash window to the right, and two 12-pane hornless sash dormers with raking roofs on the first floor. The main range has dressed stone arches to the ground floor openings, a part-glazed six-panel door near the angle with the cross wing, an early 19th-century 12-pane hornless sash to the left, and two early 19th-century 16-pane hornless sashes on the first floor. The cross wing on the right has early 19th-century 12-pane hornless sashes on both the ground and first floors.

The interior has been remodelled in both the 19th and 20th centuries. The rear kitchen wing contains a circa mid-18th century corner china cupboard with shaped shelves, along with several 18th-century two-panel doors. The building is reputed to have been the house of the mayor of the Borough of Bossiney.