An early 19th century stable block arranged around a paved courtyard. It dates probably from about 1810 and is very much in the manner of the Reptons, as is the park which was being landscaped for Capel Hanbury Leigh at about that time (1800-1826), but there is no available documentation (but see St Alban's School). It replaced the earlier stable block which stood to the east of the house.

A stable block in a restrained classical style on the quadrangular plan with buildings of different sizes and uses arranged round a paved courtyard. The entrance front has a central two storey block with a tall entrance arch and one window on each side. Beyond these is a lower, recessed, single storey, wing with two windows on the left and a plain doorway on the right. It is rendered and painted, except for the centrepiece which is ashlar stone, with imposts and keystone. The main block has a plat band at first floor level which becomes an eaves band on the wing, as well as the impost blocks on the arch. The ground floor windows are ten over twelve pane sashes, while the upper floor ones are eight over eight. There is a listel frieze, parapets, and a central attic block over the arch with a secondary cornice.

The return elevation on the left has a two storey block facing into the grounds of St.Alban's School. This is rendered with a dressed stone archway with imposts and keystone as on the main front. To the right of this is are three bays of blind panels with a central arch headed doorway. There are plat band between the floors, and a cornice and parapet over all. There is a blind, single storey, block to the right of this.

The river elevation has three doorways, two of which are double doors with arched heads, and between them a small door with a round head. There are three windows above, one 8 over 8 pane on the left and two 6 over 6 to the right. The return elevation on the right is hidden by Park Cottages.

Courtyard elevations : The entrance elevation is largely as the outside except there is no plat band between the storeys and the ashlar centrepiece rises into a gable with plain bargeboards. The archway is flanked by a ten over fifteen sash on the ground floor and a ten over ten above. The left hand side has a single storey block with two windows with 10 over 15 sashes, and a two storey block with the treatment as above on the outside except that the windows are not blind. There are ten over fifteen sashes on the ground and first floors with a central arched doorway. There is a cornice and parapet over all and a tall ashlar arch to the right.
The right hand range is two storeys. The ground floor has eight pairs of coach doors separated by slim cast iron columns which support almost flat stone arches with keystones. Above are eight windows with ten over ten sashes, but the second window from the left is a part glazed taking in door. The rear block is single storey. It has a plain door under a hood on the left and an arched door on the right, three 10 over 15 sash windows between.
The courtyard is paved with cobbles throughout, and in the centre is a circular pond with an iron rim which acted as horse trough.

The building is used as an heritage centre and museum for the Torfaen valley and County Borough. The exhibits so disguise the ground floor that little can be seen of the original building, while the upper floor has been converted into offfices.
(Source; Cadw listing database) S Fielding RCAHMW 18/08/2006