John Nash was commissioned to design the house in the early 1790s; construction work began in 1794 and was completed by 1799. Materials included locally quarried stone as well as stone from other parts of Britain. The house was laid out to a classical Georgian plan. 60,000 trees were sourced from John Mackie, a Norwich nursery man, and hundreds of tons of topsoil were brought in.
Inigo Thomas, in contrast, remodelled the house in the style of an Italian
palazzo. He added the east and west wings, creating a library and an ornate dining room and music room with a cross vaulted tunnel roof. Other buildings on the wider estate were listed in November 1994. The service range, comprising stables and a kitchen court, is listed at Grade I. Other ancillary buildings are listed at Grade II including the
game larder, and a large outbuilding. The entrance gates and
gatepiers to the estate piers and the piers, steps and walls in the North Court are all listed at Grade II. The gardens and parkland at Ffynone are designated Grade I on the
Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales. Structures within the gardens with listings include: the terrace to the south of the house, together with its enclosing walls and
balustrades, which are listed at Grade II*; and a
sundial on the west lawn; the Western Terrace; a fountain; and a
gazebo, all of which are listed Grade II. ==References==