Estate agents Strutt and Parker said Unthank Hall, near Stanhope, is one of the oldest unaltered L-shaped mansions in northern England.
The Grade II* listed residence, described by art historian Sir Nikolaus Pevsner as “a beautiful building”, was built in the 17th century.
However, it incorporates older elements, including Tudor-style arched fireplaces, mullioned windows and exposed beams.
Historical records suggest that a house existed on the site before 1200, with specific references to ‘Unthank’s Manor’ from 1395.
The property has passed through several families over the centuries, with estate agents claiming this is the first time the house has been on the market in 400 years.
Situated on the south bank of the River Wear, the property offers views over the Weardale Hills.
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The house, which is in need of some modernization, retains many period features including a sitting room with exposed wooden floor and open fireplace, family room with Tudor fireplace and kitchen with bread oven and wood burning stove.
The first floor, accessed by stone stairs, has four spacious double bedrooms, all with fireplaces, and a family bathroom with a freestanding claw foot bath.
The upper levels include a master bedroom with en-suite shower room, three further bedrooms and two attic rooms which can be renovated to provide two further bedrooms.
Accessed via a gravelled driveway, the property also includes a generous utility room, cloakroom and large outside store.
The grounds, extending to 1.8 acres, include two spacious stone walled garden areas, a flagstone courtyard and a more formal garden surrounding the house.
Estate agents said various locations on the grounds provide an ideal space for ‘alfresco’ dining and offer views of the surrounding area.
Unthank Hall is located on the outskirts of Stanhope, a popular tourist destination in the Weardale Area of Outstanding Natural Beauty.