The building is constructed from limestone ashlar with hipped Welsh slate roofs and comprises a square main block with flanking pavilions.

The rotunda staircase was designed by James Paine and is 144 feet (44 m) round; the balustrade is fitted with glass candle lamps.

The surrounding balustrade is made of fine ironwork with gilded flowers and a wooden handrail.

[2] From its beginning, it served the needs of a substantial local recusant community and still holds regular Sunday masses.

[4] By the entrance is a marble relief of the Virgin and Child, sculpted by P-E. Monnot in 1703; inside are giant fluted pilasters and a groin vault.

The sanctuary added by Soane at the west end has Ionic columns and a domed ceiling with gilded plaster.

The marble altar is by Giacomo Quarenghi, who later worked in Imperial Russia; the painting behind it is by Giuseppe Cades, and stained glass in the lunette window above is by Francis Eginton.

In 1992 the house – along with five cottages, six tennis courts, and a swimming pool in the walled garden – was sold for under £1 million to Nigel Tuersley, and was converted into ten apartments by designer John Pawson.

The two main floors of the central block, incorporating the rotunda and the original state rooms, form the principal apartment.

It has eight reception rooms arranged in a circle around a piano nobile at the top of a 60ft rotunda that rises to a magnificent glazed dome supported by eight composite columns.