Numbers 33 to 63 (Consecutive) and Attached Railings

Numbers 33 to 63 form a terrace of 31 houses built around 1836 to 1842 on Thornhill Square. The houses are constructed using Flemish bond brickwork, with brown and yellow stock brick, and have stucco finishes to the basement, ground floors, and cornices. Most have pitched slate roofs and internal party-wall stacks.

The terrace is symmetrical and curved. Each house has a sidehall entrance with a staircase. They are arranged over three storeys, with basements and some incorporating attics and dormers, typically featuring two windows per property. The ground floors are banded with stucco and have segmental arched sash windows, some incorporating margin lights. Each house has low steps leading to a square-headed doorway with a panelled door, flanked by glazing bars, and an elaborate rosette frieze and console bracketed cornice. Number 33 is distinguished by a stucco portico on its left return wall with a side entrance.

The upper floors are of brick and feature a plain sill band below the first-floor sash windows. The first floor is arranged in blocks of three houses, each displaying a pedimented three-light sash window; central windows of these blocks have segmental pediments, alternating with blocks of four or six houses, each with two architraved windows. The first-floor windows are accompanied by cast-iron balconies, while the remaining windows have cast-iron window guards. The second floors have single three-light architraved sash windows divided by pilasters, incorporating apron panels. Stucco cornices are present, some with blocking courses. Attached iron railings run along the front. Numbers 64 and 65 were demolished around 1906 to make way for the West Islington Library.