No 3 Rock Houses (Grey Rock House) including area railings

No 3 Rock Houses, also known as Grey Rock House, is a terraced house that forms a pair with No 4. It features a painted stucco street elevation that rises four storeys and includes a basement, with a one-window range. The building has a slate hipped roof that is hidden behind parapets. Notably, the ground floor window does not align with the windows above it. There is a band over the ground floor that aligns with a similar band on the adjoining Nos 2 and 4.

The house displays a heavy stucco entablature with a dentil cornice and a parapet. The windows are framed in stucco surrounds. The third-floor window has a plain surround and is a hornless 9-pane square sash. The second-floor cross window features a shouldered surround with a thin cornice, 6-pane lower casements, Gothic tracery in the upper two lights, and small brackets supporting the sill. The first-floor window, a 12-pane hornless sash, has a shouldered surround with a full entablature and cornice, along with larger brackets beneath.

On the ground floor, there is a 12-pane hornless sash window to the left of centre, which lacks an architrave, and a broad door to the right. The ground floor is characterized by an irregularly spaced 3-bay Roman Doric pilastrade, complete with pilasters, a deep entablature, and a moulded cornice. To the left, there is a narrow blank bay, the second bay matches the width of the window, and the wide right bay features broad steps leading up to a recessed 6-panel door with four raised and fielded panels and two flush panels, flanked by sidelights and an overlight with latticed glazing bars. Matching panels are found in the reveal.

The property includes spearhead area railings that are similar to those found before Nos 1 and 2 and Lexden Terrace. An iron gate opens to basement concrete steps, which lead to a 20th-century metal window and door. The front facing the sea is slate-hung and tall, rising four storeys with a three-storey canted bay, and all the windows feature top lights along with a cross-window on the third floor.