17 Heol Dulyn (Dublin Street)

This is a terrace of 1½-storey cottages located at 9-25 Dublin Street, Tremadog. The cottages are constructed of roughly coursed and squared quarried stone, with boulder footings visible at Nos 9 and 11. They have a slate roof and five stone stacks, with each cottage featuring a raked half dormer. No 9 is a two-window house with a half-glazed door on the left side. Replacement windows are set within original openings. Nos 11-25 are single-fronted, arranged in reflected pairs, and mostly feature 20th-century replacement doors and windows, some of which have been enlarged while others remain in original openings. No 11 has a small-pane horizontal-sliding sash window in its dormer. A lower doorway is blocked between Nos 13 and 15. No 25 has a two-window addition on its right side, topped with a skylight, and is adjoined by a single-storey addition named Yr Efail, which incorporates modern details.

The rear of the terrace has undergone extensive alterations and additions, featuring modern details. Specifically, No 9 includes a two-storey wing, Nos 11 and 13 have outshuts, Nos 15 and 17 incorporate two-storey wings, Nos 19 and 21 feature two-storey flat-roofed extensions, No 23 has an outshut, and No 25 has a two-storey wing.