Exterior
Imposing, 2-storey, Classical style chapel. Comprising 5-bay, pedimented front flanked by shorter staircase and entrance bays, main body of chapel a 5-window range recessed behind staircase bays; set to rear of chapel is a 3-window, double-pile block which links the chapel to the 5-bay schoolroom over the manse, set at right angles to the rear. The entrance and staircase bays to front are faced with snecked rubble masonry with freestone dressings; other elevations are pebbledashed with smooth-rendered dressings, stressed quoins at angles. The main part of the chapel has a hipped slate roof; linking block and schoolroom to rear have gabled roofs with rendered end stacks. The doors are panelled (12-panel entrance doors to front); windows are small-paned, fixed lights to front, other elevations with sliding sashes.
The principal elevation, to front, faces W; a strongly symmetrical facade, 5-bays to centre, central 3-bays of which are slightly advanced under a triangular pediment, and recessed, shorter, flanking staircase bays. The pedimented central 3-bays are divided by pilasters; Tuscan to ground floor, Corinthian to 1st floor, plain entablature with moulded cornice, and mid floor course. Ground floor has a central, keyed oculus with coloured glass window; flanking bays have paired, round-headed lights with Tuscan pilasters as jambs supporting moulded arches with keystones. First floor has paired, round-headed lights to each bay, with Corinthian pilasters as jambs supporting moulded arches with keystones; corbelled sills. The triangular pediment has a moulded surround surmounted by an urn finial. Set within the tympanum is a pedimented plaque with scrolled shoulders; in the pediment is the date and name 1897 MORIAH, below the inscription reads: CAPEL COFFADWRIAETHOL / JOHN ELIAS / METHODISTIAID CALFINAIDD.
The flanking bays are slightly recessed; with rusticated angle pilasters, plain entablature with moulded cornice and balustraded parapet with urn finials on square piers at angles. The 1st floor has single, round-headed windows with Tuscan pilasters as jambs supporting a moulded arch with keystone; ground floor windows are similarly detailed but with jambs supporting triangular pediments.
The lower, flanking, recessed staircase bays have quoins at the angles, plain entablature with moulded cornice and parapet as for central flanking bays. The front (W) elevation has a keyed oculus with coloured window over a segmental, corbelled, pediment to a Tuscan doorway; 12-panel entrance doors recessed within. Side elevations to staircase bays have 2 tall round-headed stair windows, with Tuscan pilasters as jambs supporting moulded arches with keystones.
The side elevations to the main part of the chapel have round-headed 1st floor, and segmental-headed ground floor windows; each with smooth-rendered architraves with keystone, and each floor with continuous sill-band. The linking block has similarly detailed segmental-headed windows (without sill bands) and stressed quoins at angles. The schoolroom and manse also have similarly detailed windows; square-headed to ground floor, round-headed to schoolroom above.
The chapel is set within enclosed grounds; the sides and rear with rubble walls, the front forecourt with spear-pointed iron railings on stone-capped snecked masonry bases, similarly detailed gates between large square rendered piers with moulded cornice and shaped cap.