15 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 to Nos 9 and 11, and have a slate roof and 5 stone stacks. All the cottages feature raked half dormers. No 9 is a 2-window house with a half-glazed door on the left side. The windows throughout the terrace are replacements, though set within original openings. Nos 11-25 are single-fronted, arranged in reflected pairs, and largely feature 20th-century replacement doors and windows. Some of these replacements have enlarged openings, while others are in original locations. No 11 retains a small-pane horizontal-sliding sash window in its dormer. A lower doorway is blocked between Nos 13 and 15. No 25 has a 2-window addition on its right side, topped with a skylight, followed by a single-storey addition named 'Yr Efail', which incorporates modern detailing.

The rear of the terrace has undergone extensive alterations and additions, incorporating modern details. These include a 2-storey wing to the rear of No 9, outshuts to the rear of Nos 11 and 13, 2-storey wings at the rear of Nos 15 and 17, 2-storey flat-roofed extensions at the rear of Nos 19 and 21, an outshut to the rear of No 23, and a 2-storey wing to the rear of No 25. The properties belong to a group at 9-25 Dublin Street, Tremadog.