No.4 and Attached Railings and Vaults

No. 4 Montpelier is a terrace house, dating from approximately 1770 to 1776, and later altered in the 20th century. It is now used as flats. The front is constructed of limestone ashlar, painted on the ground floor and basement, with rubble and ashlar to the rear. The roof is a mansard style with Welsh slate, topped with two ashlar chimney stacks incorporating some original clay pots, rising from a coped party wall. The rear has a staircase.

The house has three storeys, an attic, and a basement, with a three-window front. The first floor features a window in a quasi-Venetian style, with a square-headed central light, alongside four/four, nine/six, and four/four sash windows in plain reveals, and a lowered stone sill. A large wrought iron balconette is supported by scrolled wrought iron brackets. The second floor has three grouped plate glass horned sashes, with narrower windows on either side, in plain reveals and a continuous stone sill. The ground floor has a six/six horned sash window to the left and a six-panel door with a plate glass overlight in a semicircular headed opening with an ovolo moulded architrave. A pennant-paved crossover is flush with the pavement. The basement has two six/six horned sashes in plain reveals and a continuous stone sill, a 20th-century plank door in an infill, and openings for access to vaults. A double dormer features two/two sashes. Architectural details include a band course above the ground floor, a sill band to the first floor (now dressed back flush), a bracketed eaves cornice, and a coped parapet that aligns with Nos. 1, 2 and 4 Montpelier.

The interior was not inspected during the listing process.

Attached wrought iron railings with shaped heads on limestone bases are present. Attached vaults feature a raised pennant pavement with a simple wrought iron railing at the front edge, incorporating an opening with four pennant steps leading down to the roadway, and two small openings directly to the roadway.