Plas Dol-y-moch

House comprises hall and parlour (now dining room) in main range; staircase in wing to rear. Kitchen and scullery are in the west wing, drawing room in wing to right. Larders and stores to north and west of enclosed yard. The older parts of the house retain large collared trusses with angled struts and massive chamfered cross beams and exposed joists; a staircase constructed of slate slabs is raised from the hall to the top of the house and there is a slate slab floor along the rear passageway. Running around the walls of the drawing room, in the E advanced wing, is a plaster frieze depicting the shields of arms of the 15 tribes of Gwynedd; only 8 of which now remain, some others have been defaced or lost. In the principal upstairs room is a plaster overmantel that bears an armourial bas-relief with a shield of the arms of Gollwyn ap Tangno implaing a chevron between 3 spear heads (Hywel Coetmor); the shield is encircled by a floriate motif and flanked by human heads. In the back room is a similar overmantel that bears of shield of arms Quarterly Iestyn ap Gwrgan and Gollwyn ap Tangno. The crest is the Paschal Lamb, and the motto: Velle quod vult Deus; the whole flanked by human figures on pedestals.

Gentry house of 2-storeys and attics. Built of coursed and dressed local stone; slate roof with exceptionally tall stone stacks with dripstones and capping. Main range with later flanking wings. Main range of two and a half storeys, a 4-window range with the doorway offset to the R (E) with 2 windows to L and one to R. The windows are modern mullioned and transomed timber casements of 3-lights and the attic windows are 2-light casements in gable dormers. The gable end of the advanced wing to R has similar ground and 1st floor windows and the 2-light casement attic window is set in a rendered gable apex; the ground floor window in a partially blocked doorway. The L lateral wall has a single ground and first floor window and the R lateral wall is a 3-window range with central doorway and gable dormers. A stone on the outer wall is inscribed with the date: 1643. The L (W) advanced wing is slightly lower, and has similar windows to ground and first floor, the R lateral wall has a single window and the L (W) wall is a 2-window range with first floor windows in raking dormers that break the eaves line. At the NW corner is a single storey range built to an L-shaped plan along the N and W sides of an enclosed yard; the range has boarded doors and small paned casements of 2 and 3-lights.