Hen Dwr Llandudno · Conwy · Wales

Hen Dwr stands on a ridge above Llandudno, at the end of Nant-y-Gamar Road and about 500 metres south of Bodafon Hall. It is a former tower windmill, later adapted to domestic use, and retains the distinctive form of its mill tower.

The site has an early windmill history. A windmill was built on the hill between 1617 and 1642, and a mill on the site of the present building is apparently shown on a 1748 map by Lewis Morris. A windmill is also clearly shown at this site in the illustration in Pennant's Tour of Gloddaeth Hall. By 1840 the building was in domestic use as the Old Windmill, and the small two-storey extension probably belongs to that phase of conversion. Coflein records that by 1842 the Old Mill was a dwelling.

The former windmill tower survives as a two-storey tapering structure, pebbledashed externally and covered by a pointed conical slate roof with a brick chimney. The roof dates from about 1930. The tower has windows at two levels with modern glazing. A small two-storey extension in matching materials adjoins it, also with a brick chimney, while a larger late twentieth-century extension is attached but excluded from the listed description. The old tower retains two exposed beams on the ground floor and a single stop-chamfered beam on the upper floor.

The building was extensively renovated and modernised from the late twentieth century. It was designated as a Grade II listed building on 10 January 1951, notwithstanding later additions, as a picturesque structure with probably eighteenth-century origins.