St Ola's Kirk Including Memorial Enclosure, Brettabister

St Ola's Kirk, located in Brettabister, was built in 1794 and is a 4 x 1-bay symmetrical hall church with a rectangular plan. The walls are made of harl-pointed rubble with sandstone margins and details.

The north (principal) elevation features a symmetrical design with tall round-arched windows on either side of the center, which has fixed Y-traceried timber glazing. The outer bays have 12-pane timber glazing. The west elevation is also symmetrical, with a doorway at the center that has vertically-boarded timber infill and a 3-pane fanlight set in a keystone arch-head.

On the north (rear) elevation, there is a symmetrical design with a gabled vestry wing projecting from the center. This wing has vertically-boarded timber infill for the door on the east side, a 4-pane timber fixed-light on the west side, and a tall square gablehead stack. The east (entrance) elevation mirrors the design of the west elevation but includes a 2-leaf vertically-boarded timber door. It has a square ashlar plinth that breaks the eaves and rises to an open-work birdcage bellcote topped with a stepped pyramidal cap; the bell has been absent since 1996. The principal roof and vestry are clad in modern grey tiles.

Inside, there are stone flagged entrance porches on the east and west sides, leading to a flagged center aisle on the ground floor. The hall features timber fittings, including 4-panel doors, vertically-boarded wainscoting, and horizontally-boarded pews with panelled fronts to the south of the center aisle. There are grained pews flanking a canted panelled and grained pulpit, which is accessed by a balustraded stair. The pulpit has a grained back panel that rises to a corniced circular canopy with a sounding board and an octagonal ogee dome topped with an urn finial. Timber half-turn stairs lead from the porches to a U-plan gallery with horizontally-boarded pews and a panelled front over a dentilled cornice, supported by timber columns. The ceiling is timber-lined with a coombed design and decorative ventilators.

The memorial enclosure consists of a concrete-coped harl-pointed rubble wall that surrounds memorials at the center of the south elevation. Access is provided by a cast-iron gate on the east side, and there is a sandstone Greek Revival headstone containing a marble memorial slab dedicated to Reverend Inches.