Watermouth House, Including Garden Outbuilding Immediately to Rear

Watermouth House, including the garden outbuilding immediately to the rear, is a house built in the late 19th century. It is constructed of unrendered stone rubble and features a slate roof with gable end brick stacks and an axial brick stack. The building has lion's head guttering and a double-depth plan, built into a bank, allowing rear access to the first floor principal rooms and an off-centre front doorway to the ground floor rooms. The house has three storeys, and all windows on the front and rear have hoodmoulds with returned ends.

The facade consists of three bays, prominently featuring a first-floor verandah that projects on decorative wrought iron brackets. This verandah has a hipped tiled roof supported by slender chamfered timber posts and is enclosed by a balustrade of shaped splat balusters. The central bay of the facade breaks forward and is supported below by raking struts resting on stone corbels. The hipped roof of the projecting balcony is topped with a clay ball finial. Transomed French windows provide access to the balcony, while the upper and ground floor windows are 12-paned sashes. The ground floor features an off-centre six-panelled door.

The interior of the house is not accessible for viewing. The garden outbuilding at the rear is also made of stone rubble with brick dressings and has a pyramidal slate roof. It is square in plan, three storeys high, and built into the bank with garden access to the first floor. Watermouth House served as the dower house to Watermouth Castle.