Gibblestone House, Main Street, Scalloway

Gibblestone House is a late 18th century building that underwent alterations in the late 19th century. It is a two-storey and attic, three-bay symmetrical former merchant's house with harled walls, margined windows, and corners.

The south elevation features a symmetrical design with a corniced and parapetted stone entrance porch at the center. This porch has a four-panel timber door with a rectangular fanlight, flanked by paired pilasters that clasp the corners. Above, there is a piend-roofed timber bay window with a bipartite window and sidelights on the upper floor. On either side of the entrance porch are single-storey, four-light canted and parapetted stone bay windows. The outer bays on the first floor have regular fenestration.

The west gable has a two-bay design, blank at the ground level, with a window in each bay on the first floor. The north (rear) elevation includes a two-storey lean-to addition with a catslide roof in the center, and regular fenestration in the outer left and right bays. The east gable is blank.

The principal elevation features plate glass timber sash and case windows, while the west gable and rear elevation have 12-pane timber sash and case windows. The roof is covered with purple-grey slate, and there are piend-roofed slate-hung canted timber dormers over the outer bays of the south pitch, each with four-pane timber sash and case principal windows and plate glass sidelights. The harled gablehead stacks have stone copes and octagonal cans, and the skew-copes are painted with bracketted skewputts.

The boundary walls and gatepiers create a formal arrangement enclosing the gardens, which step down to the south. The upper garden is enclosed by a rubble wall, with the lower wallhead featuring an ashlar cope and modern railing, centered by a pair of tall ashlar gatepiers topped with corniced and ball-finialled pyramidal caps, along with two-leaf cast-iron gates. The lower garden to the south is enclosed by a random rubble wall facing Main Street, which has a triangular cope and is terminated to the east and west by square rubble piers with pyramidal caps.