It appears that Plas Coch occupies the site of three medieval burgage plots, in the late 16C all owned by Griffith ap Richard ap Harri ap Sir John, so it looks as if they were amalgamated to form a large plot in the centre of Ruthin. The location at this time was known as TalySarn. (Gareth also described his extensive research into several generations of occupiers of these burgage plots)

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The house was built by Gruffydd ap Richard ap Harri, or his son Robert Parry.

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The house was built of local cut red sandstone, maybe 'recycled' from the decaying castle, and massive timbers of local oak supported a slate roof. The choice of local sandstone is surprising as by now people should have been aware off its low resistance to weathering. The slate would probably have come from the nearest quarries which were then developing on Bwlch Oernant. (Horseshoe Pass)

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It was a two-storey four-bay end chimney house with roof lofts. The facade is broken by three ground floor windows and four large upper-floor windows. It would have been a large and striking town house. Extensions were added at an unknown date. There were eight hearths and eighteen windows - a house of prosperity.

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1673 John Parry left the house, in his will, to trustees to pay off his debts. 

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1692  The Great Sessions assigned Plas Coch to Peter Ellice (sic) and his wife Sarah, of Croes Newydd.

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​1699 The Elis family sold to the ubiquitous Williams Wynns of Wynnstay. Plas Coch became a tenanted home for the gentry and professional people:

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1699-1707 Roger Jones, maltster and alderman

1715-1728 David Francis, apothecary

1748  Mrs Anwyl, widow.

1766-1776 Mrs Hughes, widow.

1780-1793  Rev. Ed. Owen

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From c. 1840 Plas Coch was divided into two or three houses :

​1841 Census : ?Owens and five others .  William Williams , Doctor, wife and 3 others, inc. Sarah Povah, laundress ​

​1851 Census : Ann Maurice, gentlewoman, nephew James and 3 servants.  Sarah Povah, lodging housekeeper, 1 lodger, 2 servants . Robert Edwards, solicitor, two children, two servants.

​1861 Census :Maurice, Mayor of Ruthin, 2 servants . Thomas Compton Jones, wife and three children, one servant. Robert Edwards , solicitor, wife, three children, two servants.

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Robert Edwards became the sole tenant of the whole house.

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1n 1891 occupants were the Jones family, who owned an ironmongers business on St. Peter's Square. They bought the property from the Wynnstay estate.

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In 1906 they sold it, as 24 and 26  Well Street - '... a charming old-fashioned residence with a handsome oak staircase and oak floors throughout. On the ground floor there is an entrance and an inner hall, four entertaining rooms, kitchen, larder etc. on the first floor are four bedrooms and a dressing room, and on the third floor are four spacious attics. The outbuildings comprise a stable, coach house and shed, with a summer house and gardens.'

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In 1963 Plas Coch was sold to become a banqueting hall, the interior being gutted and almost all interior walls removed.

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In 1977 it became the local Conservative Club, and in 2022 it was sold to local company Lavinia Stamps, who tastefully  converted once again to become 'The Dreamatorium', an Arts and Crafts Centre .

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