Birdoswald Farmhouse

Birdoswald Farmhouse (also known as Birdoswald Tenement) is a former farmhouse, now serving as headquarters for the archaeological unit excavating the adjacent Roman site. The building was substantially constructed in 1858 by Henry Norman, but incorporates extensive remnants of an earlier structure, possibly dating to the 15th or early 16th century and perhaps erected by the de Vaux family.

The building is constructed of coursed rubble masonry, rendered on all but the rear (north) elevation, with Welsh slate roofs. The plan consists of a principal range aligned east-west, two rooms deep, with main living rooms to the south and scullery and service rooms to the north. Entry is from the south through a central porch. Attached to the west of this range is a two-storey tower, which appears to be almost entirely a 19th-century construction in tower-house form.

An internal dated lintel in the principal range between the service rooms and entrance hall (AQMB1745, commemorating Anthony and Margaret Bowman) and a blocked window indicate that the original range was once only a single room in depth, later extended in 1858. The rear wall of the southeast room and the wall dividing it from the entrance hall are extremely thick and contain features confirming an early date: a four-centred stone doorway arch (partially blocked but visible in the entrance hall), the remains of a newel stair in the southwest corner, and an early blocked window on the first floor of the rear wall. These features suggest the southwest room may once have been a tower-house, though the presence of a high-quality ground-level doorway complicates this interpretation. A 19th-century engraving confirms there was no tower to the west before 1858, though an external stack visible on the east wall of the tower predates the 1858 work; its extensive corbel table survives in the roof space and may have served as a corbelled fireplace, though this seems unlikely in this position.

The south elevation presents a symmetrical four-window range with a castellated gabled porch containing a datestone inscribed HN 1858 beneath a small single-light window. A square-headed doorway with chamfered surround opens below. The first floor features two-light windows with chamfered and vermiculated mullions and surrounds, together with two-pane hornless sash windows. Three-light windows flank either side of the porch with identical treatment. An internal end stack on the east wall (with three brick shafts) has stone coping and includes one 20th-century window.

The rear (north) elevation of the principal range displays 19th-century fenestration in a three-window range, with the righthand (west) windows set well to the west. Eight-pane hornless sash windows appear throughout, though the ground floor left window has been altered. Stone plain surrounds frame the windows. One doorway appears to the left with another blocked right of centre.

The tower is rendered except for its north elevation and battlements, with render cut back at the angles to resemble quoining. It comprises two stages with the upper stage slightly recessed. The battlements are corbelled out with external stacks to east and west. The south side has one window to each floor—two lights to the first floor and three to the ground—all with plain chamfered mullions and surrounds. The west side features two two-pane hornless sash windows to the first floor and a narrow slit to the external stack at the same level, all with stone surrounds. A shield is centrally placed on the battlements. The north side has a two-pane hornless sash window to the first floor, with a lean-to structure featuring stone coping and a studded 19th-century door.

Internally, many early features likely remain beneath plaster. The four-centred doorway, remains of the newel, and the old window with wooden lintel mentioned above are visible. Otherwise, the interior displays standard 19th-century fittings, including one stone fireplace in 16th-century style. The roof is a standard tie, ridge-piece and side purlin construction, difficult to date but predating 1858. The corbelling in the west gable indicates an ancient well at this point, though its date is unknown.

Henry Norman, the 19th-century owner, was an antiquarian who conducted his own excavations of the adjacent Roman site. The tower to the west represents an interesting example of medieval reconstruction, though it is possible that archaeological evidence indicated a tower's presence here, and the surviving 16th-century work may represent remnants of a hall range. Birdoswald Farmhouse demonstrates the long-established and continuous occupation of this site from Roman times.