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Cof Cymru: National Historic Assets of Wales · Wales

Kitchen garden walls and former coach house (The Studio) at Plas Tan-yr-allt

Porthmadog, Gwynedd, Wales

The record

Designation
Listed building, Grade II
Broad class
No class recorded
Date of designation
26 September 2005
Locality
Tremadog
Community
Porthmadog
Unitary authority
Gwynedd
Country
Wales
Coordinates
52.94219, -4.13662
Cadw reference
85388

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

Shown on 5 historical map sheets, the earliest the 1795 "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

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This record in Cadw's own full report ↗

Cadw's description

On the W side of the house.

Tan yr Allt was built by William Madocks (1773-1828) in the first decade of the C19. The walled garden was probably an original component of the gardens and is shown on the 1842 Tithe map. The coach house at the upper end is first shown on the 1871 Tremadog estate plan and the water tank at the upper end is first shown on the 1888 Ordnance Survey.

On a sloping site and approximately 90m N-S by 40m, the garden is defined by rubble stone walls which, on the E and W sides, converge at the S (downhill) end. Part of the W wall has an inner brick face. E and W walls have pointed doorways, which on the E side has a wrought-iron gate with quatrefoil and trefoils in the arch (also used at 4 Church Street, Tremadog, and possibly made at Britannia Ironworks, which produced architectural ironwork for Clough Williams-Ellis in the early-mid C20). In the NW corner is a large stone water tank, later used as a swimming pool, with brick and render inner walls.

The N side is occupied by a former coach house of rubble stone and slate roof. It has replacement windows and door to the S side facing the garden. Its N side facing the drive to the house, retains original openings but the details are all modern. On the E side is an added lower tack room.

Listed as an original component of the gardens complementing the setting of Plas Tan yr Allt, as well-preserved C19 garden walls, and for their contribution to the historical integrity of the house.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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