1 Castle Hill, formerly known as Wantage, outbuilding to the north-north-east, and sundial to south

1 Castle Hill, formerly known as Wantage, is a detached house built in 1901 to designs by Herbert Buckland of the architectural practice Buckland and Farmer. It is listed together with an outbuilding to the north-north-east, boundary wall, and sundial. The house is an example of Arts and Crafts Domestic Revival style.

The building is constructed partly in roughcast and partly in Flemish-bond brick with stone dressings, under plain clay tile roofs. It is built on sloping ground and comprises two storeys with attic and basement. The roof is hipped with stone coped gables and deep sprocketed eaves, wrought-iron gutter brackets and decorated rainwater heads bearing cast dates of 1901. The chimneys are tall and battered, rendered in roughcast.

The entrance front to the north presents an asymmetrical composition with a 3:1:1 window range. The right side has two projecting bays under a pyramidal roof, whilst a projecting brick gable rises to the left. The second bay features a wide semi-circular arch surrounding a deeply-set integral porch. Above the porch, under the eaves, is a large carved stone corbel displaying an interlaced monogram of the letters spelling WANTAGE, with the letter A used twice. To the right of the gable stands a stone canted bay window with a flat roof. The elevation is punctuated by stone and wooden mullion windows with leaded panes; ground-floor windows include transoms, and the attic features wide dormers with flat roofs and leaded panes.

The western side displays a projecting brick gable with stone mullioned and transomed windows. The first-floor central light contains a datestone inscribed A 1901 D. The rear garden front comprises a three-bay gabled range in roughcast to the right, with various wooden and stone mullioned and transomed windows, a stone bow window, and a verandah with tiled canopy to the left corner, with a further stone bow window set back. The east side incorporates a gable with timber mullioned and transomed windows and a lean-to outshut.

The metal windows are likely by Henry Hope and Sons of Birmingham, manufacturers who frequently supplied windows for Buckland's houses; identical models appear in contemporary Hope & Sons catalogues.

The interior retains most of its original features in the principal rooms. Rooms are finished with shallow moulded coving, and doors are six-panelled with high mid-rails, some part-glazed. The central entrance hall features a stone and brick corbelled fireplace with Delft tiles and coloured glass panels. The oak staircase has heavy square-section newels, a moulded handrail and closed string with paired stick balusters. The hall is panelled to dado height, with panelling continuing on the enclosed dog-leg stair section.

The drawing room contains a large painted and panelled chimneypiece with figural tile inserts set in an arched alcove with integral bookshelves. The former dining room features a deep panelled inglenook with a stone fireplace having a moulded arched opening and bowed moulded mantelshelf on corbels, panelled settles with curved arms, and built-in shelving. An inset arch with integral sideboard contains elaborate hinges and a coat of arms in the stained glass window above. The room is decorated with a much-painted scrolling plaster frieze to the cornice, possibly by Robert Catterson-Smith. The study's chimneypiece includes small cupboards with copper strap hinges. Ground-floor service rooms have simpler ledged and braced plank doors with segmental arches over, set within painted brick walls.

First-floor rooms display visible ceiling beams, whilst those within the gables show partly visible trusses. The principal bedrooms at the east end of the first floor contain small fireplaces with tile inserts in timber surrounds (now with gas fires) set within fitments with panelled overmantels and double wardrobes with moulded architraves. One bedroom has a smaller but similar fitment with a fireplace, panelled cupboards above and an arched niche to the left. The first-floor east end has undergone significant recent alteration: the roof structure has been partly replaced, three rooms stripped of lath and plaster with decorative features removed, and new floorboards introduced. Original doors from this section are retained in storage. The former attic stair has been removed, though ladder access shows that attic rooms have been plastered and painted.

An extensive basement, accessible only from outside, contains multiple brick-divided areas including wine cellarage with segmental-arched openings.

The outbuilding to the north-north-east is a small single-storey structure built in brick with stone dressings and a hipped roof with sprocketed eaves. A painted timber dovecote with finial is mounted on the ridge. The west wall bows outward at the centre, whilst the south side has a double doorway (fitted with temporary doors at the time of inspection in March 2016) and a gateway linking it to the house.

The long boundary wall defining the plot frontage to Castle Hill is constructed in the same pinkish brick as the house with regular piers at 4–5 metre intervals topped with moulded brick caps. Three larger gatepiers are built in brick with stone quoins and stone cushion caps. The pedestrian gateway at the western end has been infilled in brick; the wide vehicular opening and pedestrian gateway at the eastern end retain their contemporary timber gates.

On the terrace immediately south of the house stands a stone plinth supporting a sundial inscribed: 'Abuse me not, and I will do no ill: I stand to serve thee with goodwill; as careful then be sure thou be, To serve thy God, as I serve thee'.