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Castell Gwylan

A Grade II Listed Building in Llanddaniel Fab, Isle of Anglesey

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Latitude: 53.1828 / 53°10'58"N

Longitude: -4.229 / 4°13'44"W

OS Eastings: 251146

OS Northings: 367397

OS Grid: SH511673

Mapcode National: GBR 5K.3K62

Mapcode Global: WH54D.08GB

Plus Code: 9C5Q5QMC+49

Entry Name: Castell Gwylan

Listing Date: 23 April 1998

Last Amended: 23 April 1998

Grade: II

Source: Cadw

Source ID: 19744

Building Class: Domestic

Location: On the banks of the Menai Strait, SE of Porthamel Hall.

County: Isle of Anglesey

Community: Llanddaniel Fab

Community: Llanddaniel Fab

Locality: Porthamel

Traditional County: Anglesey

Find accommodation in
Port Dinorwic


Probably built in early C19 as the boathouse for Porthamel Hall, situated in Llanidan community. The hall was remodelled, probably during the C18 and the boathouse was built with a similar Gothick facade.


Early C19 castellated Gothic style house of rubble masonry rendered and colourwashed. Symmetrically planned main elevation overlooking Menai Strait. Two storey 5-window range, 1-3-1 with outer bays advanced and carried up as angle towers. Castellated parapets with band below. Sash windows with pointed arches and with glazing bars interlaced at head. Four-centred arched entrance in flat roofed porch. Modern flat roofed extensions to rear.


Modernised, retains no original features of note.

Reasons for Listing

Listed as an elaborately detailed early C19 boathouse retaining its original Gothic facade (notwithstanding alterations to rear); a prominent feature on the Menai Strait shoreline and forming a group with Porthamel Hall.

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Other nearby listed buildings

  • II Privy tower at Porthamel
    Located to the S of Porthamel house, in the corner of the garden. The tower is set alongside a former road (now disused) leading up from the the Menai Strait.
  • II Porthamel
    Located 700m SE of the A4080 Brynsiencyn Road, at the end of a single track drive. In front of the house is a walled terrace with dressed coping; central steps down to the lawn are flanked by dressed
  • II The Old Cutter
    Sited on the NW shore of the Menai Strait, facing Y Felinheli. Reached by a single track road leading off the A4080, passing Plas Coch.
  • II Church Lodge
    Located at the right side of the western entrance to St. Edwen's Parish Church, along the Moel-y-don road, c.1.10km SSE of the crossroads with the A4080 Brynsiencyn Road.
  • II Church Lodge entrance walls and gatepiers
    Forming the western entrance to St. Edwen's Parish Church, along the Moel-y-don road, c.1.10km SSE of the crossroads with the A4080 Brynsiencyn Road.
  • II Barn at Plas Coch
    Located in an enclosed area c200m S of Plas Coch, on the edge of rolling parkland.
  • II Decorative walling in front of Plas Coch
    Length of decorative walling with steps, to the E of the main front of Plas Coch.
  • II* Plas Coch
    Standing in parkland 600m NW of the parish church of St. Edwen.

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