A seventeenth century house with an older, sixteenth century cross-wing, later modified and otherwise altered. It is two storeys throughout. The walls are of roughly coursed rubble, more massive in the cross-wing, with longer stones at the corners and gable. It has slate gabled roofs with north and west gable end stacks.
The house faces west towards a later farmyard. The main range presents an irregular facade with an off-centre doorway in a nineteenth century gabled porch. Its interior retains original beams and an oak dog-leg stair. There is a massive chimney breast abutting the cross wing. This lacks a chimney. The cross wing itself has a blocked fireplace and two blocked doorways.

A garden or gardens have been identified (NPRN 86359)

Sources: RCAHMW Caernarvonshire Inventory I (1956), No. 624, 175 fig 172
CADW Listed Buildings Database (5893)

John Wiles 09.05.07

[ADDITIONAL 2011:] Tree-ring dating has established that the older range was built in the late sixteenth century. Report and site description prepared for Vernacular Architecture 42 (2011):

x. PENMACHNO, Dulasau-uchaf (SH 8308 5165) South Wing Felling date range: 1562-92
Principal rafters (1/2) 1551(H/S); Purlin (0/1). Site Master 1450-1551 dluc2 (t = 7.7 GWYDWN; 7.3 WALES97; 7.3 PORCHBC)

Dulasau-uchaf is a multi-period farmhouse incorporating an early storeyed house as the south wing. This early house was of end-chimney two-unit (?Snowdonian) type with evidence for a post-and-panel partition under the ('re-set) beam between hall and outer bay. Latterly the wing may have had an end-chimney lobby-entry plan and possibly functioned in a unit-system arrangement. Plan in RCAHMW, Caernarvonshire Inventory, Volume I: East (1956), p. 175, fig. 172 (mon. 624). Dating commissioned by NWWDP in partnership with RCAHMW. (R.F. SUGGETT/RCAHMW/July 2011)