Capel Salem, including forecourt gates and railings

Capel Salem is a classical style chapel with a façade of snecked stone and lighter freestone dressings, and a slate roof behind a coped gable. Built in 1862, it is a 5-bay structure with projecting outer stair towers in line with vestibules and an open lean-to porch added to the original façade.

The porch incorporates a Serliana corresponding to the central bay of the chapel, with rusticated quoins, round columns and a keyed moulded arch with outer moulded lintels. It is surmounted by a coped gable with a tablet dated 1955 commemorating a former minister, and an iron finial. The lean-to roof, of frosted glass, is concealed behind the gable and a low parapet. To the left and right are slightly projecting vestibules, each with a pair of 2-light round-headed windows with a central colonnette of polished pink granite with foliage capital. Inside the porch is a 2-light window with similar polished-granite colonnette and capitals. On the right side of the window is a marble tablet commemorating the First World War (1914-18). The vestibules have panelled doors under overlights with glazing bars.

Behind the porch are the full-height Tuscan pilasters of the earlier façade. These have entablature and cornice in the outer bays, while the central bay has a rusticated glorification arch in the pediment. The entablature is inscribed 'Congregational Chapel 1862', though the first letter and last numeral have been re-set into the sides of the projecting towers. Gallery windows are Italianate with keystones and capitals to moulded heads. The window in the central bay has 2 main lights with narrow arched flanking lights and a sill band, while the outer bays have 2-light windows. The tympanum of the glorification arch has a panel with 'Salem' in raised letters beneath a segmental pediment framing scalloped ornament.

The projecting 3-stage stair towers are rectangular in plan with narrow sides facing the front. In the lower stage the front has a pair of windows under shouldered lintels, while the outer sides have a margin-lit window under a shouldered lintel. The middle stage has a tall 2-light window with central polished pink granite ringed colonnette with foliage capital, under a keyed moulded head, and round-headed margin-lit windows to the outer sides with similar moulded heads. The inner sides have leaded lights. The upper stage has, above a blank entablature and cornice continuous with the pediment of the main chapel, 2 round-headed windows with keystones and capitals to single windows on the inner sides and similar triple windows to the outer sides. Pyramidal slate roofs sit on a moulded stone cornice and incorporate bands of diamond slates below an apex iron finial.

The forecourt, restricted by late 19th-century additions to the front, has segmental double iron gates to hollow cast iron piers, flanked by similar single gates and further piers. The piers have narrow X-shaped panels enriched by scrollwork, while the gates have X-shaped panels to the dog bars. Railings to the right and left are on dwarf rubble-stone walls with freestone coping and terminate in square freestone piers with moulded capitals. On both sides the forecourt railings return to the sides of the towers, where there are similar terminal piers.

The 5-bay side walls are roughcast on a coursed rubble-stone basement, where the ground level falls at the rear. The chapel is lit by tall round-headed windows in architraves with sill band, incorporating Italianate tracery and 2 tiers of 4-pane sashes. The basement has segmental 4-pane sashes. In the right side wall the bay left of centre has a boarded door while a second boarded door is set in from the right-hand bay. The rear has a narrower gabled projection housing the organ and vestry. Its side walls have a tall 2-light window with Italianate tracery above on the right side, 2-pane sash windows to a passage below the organ and the basement. In the left side wall are two 4-pane sash windows to the vestry, while the basement has a 4-pane sash window to the right and boarded door with overlight to the left. The gable end has a 4-pane sash to the right of an external stack (reduced to below the eaves) to the vestry and basement.

Each vestibule has double panel doors to the chapel and stairs to the gallery. The stairs have turned balusters and newels and are reached through lintelled openings with plaster panelled soffit and enriched head consoles. The chapel interior retains detail and fittings of 1862, though the set fawr, pulpit and organ are late 19th-century. A 3-sided raked gallery has fluted cast iron posts and foliage capitals. It projects on a dentilled cornice and has a front of panels framed by panelled pilasters. The date 1862 is painted beneath the replaced clock. The plaster ceiling has a moulded cornice and an arched coving with relief latticework to a higher cornice framing the panelled ceiling. This has marginal panels with slender ribs and diagonal ribs to a central rich ceiling rose. The rere arch of the window facing the porch has Corinthian pilaster capitals and a moulded arch with foliage-enriched keystone. The window has stained glass. The organ recess has similar Corinthian pilasters, while the recess has a ribbed ceiling with central pendant and side windows with stained glass.

Low panelled box pews are retained with original umbrella holders. Other furnishings are late 19th-century. The set fawr has a balustrade over a panelled base. The pulpit has 2 round arches and is flanked by an arcaded balustrade and steps with turned balusters. Behind it is a rich panelled reredos below the organ incorporating fretwork ornamentation.

A panelled door to the right of the set fawr leads to the rear vestry and the hall in the basement. The basement has simple cast iron columns.