Garage/coach house range at Plas Tregayan

Lofted linear range with principal elevation facing NE, away from the enclosed courtyard of which it forms the NE side. Built of rubble masonry, the principal elevation of dressed, coursed stone. Slate roof with squat gable stack at L (SE) end raised by brick. At the L end is a shallow basket arched opening with chamfered jambs and slightly stressed keystone; above the arch is a stone tablet which bears the name and date: ADMIRAL LL / 1839. To the right of the arch is a single doorway with flat arch and there is a modern casement window set under the eaves between the 2; a further 2 loft windows along the range to the R. At the R end are 4 double garage doors with stone piers between; all under a long RSJ and with iron and glass canopy above. At the end of the range external stone stairs lead up to a loft doorway in the NW gable.

Single storey addition along the NW end of the rear wall of the coach house under a catslide roof; another single pitched outbuilding has been built at right angles to its NW corner. Access to the addition is through a flat arched doorway in the NW gable, a further doorway opens into the courtyard to the rear of the range and is flanked by small paned sash windows. The single pitch roofed outbuilding now has a roof of profiled material and has a single doorway in the SW gable; principal doorway in the SE wall has flanking ventilator windows.

The interior of the coach house appears to have been modernised when the early-mid C20 alterations were made.