4 Portland Place

4 Portland Place consists of a group of buildings, with No 1 (Portland House) dated 1855 and Nos 2 to 7 likely constructed shortly after. The buildings feature a simple classical design, with two stories for most, except for No 1, which has three stories. They have three-window fronts and advanced hipped end pavilions. The structures display rusticated quoins, except for No 6, which has end pilaster strips, and are finished in scribed render, cement render, and roughcast. The roofs are slate with wide boarded eaves, and there are six cement render and two rubble chimney stacks.

The windows are predominantly 12-pane sash, with Nos 1 and 7 having 16-pane windows on the ground floors. No 1 features lintels, while Nos 2 to 7 have lugged architraves, some adorned with keystones. No 2, formerly the Customs House, has cill and decorative bands. The entrances to Nos 2 to 6 are arched, with No 2 having a rusticated surround, Nos 3 and 5 featuring bracketed hoods, and Nos 4 and 6 displaying panelled architraves with keystones. Nos 1 and 7 have open pedimented doorcases with slender columns. The doors are recessed, with Nos 2 and 4 to 7 having six panels, No 3 having a modern door, and No 1 featuring an eight-panel door. All except No 6 have five-pane fanlights, and Nos 1 and 7 have panelled reveals at their doorways.

The right end wall is plain scribed render, and there are various cross ranges at the rear. The left end wall overlooks the River Aeron and features sash windows and a side entrance. A datestone at the base reads: "Portland House built by Benjamin Evans in 1855."