Schoolroom Pavilion, St John's East Church, Constitution Street, Leith, Edinburgh

St John's East Church, located on Constitution Street in Leith, Edinburgh, was built in 1773 and later remodelled and re-fronted by David Rhind in 1843. This rectangular-plan preaching-box features a later Gothic refacing, a west tower, and a single-storey wing to the north. The church is constructed of cream sandstone with a polished ashlar front and tower, while the rear and sides are made of coursed rubble with ashlar quoins. It has a cavetto eaves cornice, a front base course, and principal openings adorned with 4-centred arches, ashlar mullions, and hoodmoulds with angled label stops. The structure also includes angle buttresses topped with octagonal pinnacles, gabletted faces, and elongated ogee heads.

The west elevation features a three-stage lantern tower at the centre, with a pointed-arch doorway and a row of blind quatrefoils above. The second stage has two tall bipartite windows on the south, west, and north faces, while the top stage has a broached base of the spire with corner pinnacles and clock faces (without faces) framed by corbelled shafts. The tall octagonal belfry has lancet windows and octagonal corbelled shafts that break the eaves, leading to a pierced arcaded parapet. Y-traceried windows flank the tower.

The east elevation is gabled and has two tall windows flanking a blocked oculus and a square blank ashlar cartouche, along with a keystoned bull's-eye window in the gablehead. The original round-arched and keystoned openings, which are blocked, include a doorway flanked by two windows, and a tall window in the gablehead is flanked by smaller windows.

Both the north and south elevations feature three tall arched openings and large Velux rooflights.

The side wing is constructed of stugged ashlar and is a single-storey rectangular-plan structure. It has rectangular openings with chamfered reveals and ashlar mullions, along with pinnacled buttresses. The west elevation has four bays, with a doorway to the left of centre, a four-light canted window with a parapet rising to a finialled gable above to the right of centre, and single windows in the outer bays. The south return has a single window and a stepped parapet.

The church has replacement windows throughout and a slate roof with lead flashings, as well as triangular ashlar skews. The interior has been gutted with three storeys inserted. The front features a low rubble wall, cast-iron railings, two square coped gatepiers, and the base of an octagonal gatepier.