No. 18 And Attached Railings

No. 18, Portland Place, is a house, now converted into flats, dating to circa 1786, with alterations in the 20th century. The front of the house is constructed from limestone ashlar, while the lower parts have rubble walls. It is a double-pile house with a parapeted mansard roof covered in Welsh slate. The building is wider at the front than the rear and features a staircase at the front.

The house has three main floors, an attic, a basement, and a sub-basement, with a two-bay, three-window front. The first floor has a six/six-pane sash window in a splayed reveal to the left, and two similar paired sashes to the right. The second floor mirrors this arrangement. The ground floor has paired six/six-pane sashes in splayed reveals on the right, with a continuous stone sill, and a six-panel door with flush beaded and glazed panels to the left, accessed by two pennant steps. There is a small 20th-century window in a splayed reveal to the left of the door. The basement has paired six/six-pane sashes in splayed reveals and a small opening to the sub-basement below. A double and single dormer window are present with six/six-pane sashes in moulded architraves. Features include a band course above the ground floor, weathered sill bands to the first and second floors, a modillion eaves cornice, and a coped parapet. Blocked windows, likely later insertions, are visible on the ground, first, and second floors. The rear elevation features three grouped windows with six/six-sashes on each of the ground, first, and second floors, along with a double and single dormer window.

The interior, partially inspected during conversion, includes a cantilevered stone staircase with a moulded soffit, a mahogany grip handrail, and a stone-paved hall. The ground floor room at the rear right has a 19th-century marble fireplace with a late 19th/early 20th-century grate, moulded cornice and frieze, replicated around a partition. A similar stone fireplace is found on the ground floor front left. A 19th-century marble fireplace with an early 20th-century grate and tiles is located on the first floor at the rear right. The first floor front right has a marble and timber fireplace dating from circa 1900, using possibly re-used earlier marble, and a marble hearth. The second floor right has a stone fireplace with a double architrave, frieze and cornice, paired with a grate similar to those in the house. Remains of a similar fireplace with early 20th-century alterations are found on the second floor rear. A 19th-century staircase leads to the attic. A small stone fire surround with a timber shelf on brackets is found on the third floor front right, along with remnants of a similar fireplace on the second floor rear. The basement was not inspected.

Attached to the house are wrought iron railings and a gate with urn heads and an urn finial to the left, set on limestone bases. This building shares a history with Nos. 1-10 Portland Place.