Built of roughly coursed grey rubble with grey or yellow ashlar dressings; slate roof with stone apex finials. Plan of large W tower, nave, S porch, chancel, NE chapel and N wing. Dominating and defensive W tower has a saddleback roof, with embattled and corbelled parapets only to N and S; stone tiled gable coping surmounted by a compass weather vane. N and S faces have 4 storeys of small tower openings, round or square headed, one to S trefoil headed, some with relieving arches, some chamfered surrounds; wide angle buttresses with deep offsets at each corner. E face has large shouldered opening above massive corbel table presumably formerly supporting a timber platform; wide relieving arch above steep pitched nave roof, the weathercoursing of old stone slates visible just above present roof and incorporating a tiny light above the swept eaves on S side. W face has a face corbel, reputedly of John the Baptist, above louvred gable opening; clock; 3 light W window with cusped panel tracery and hoodmould in a deep concave surround finishes on a sillband defining the W entrance. Late medieval moulded pointed arched W doorway has small shallow attached triple shafts with polygonal capitals standing on a stone bench and rising at sides to form crocketed finials incorporating shield-bearing angels; a cross rising from the apex of the ogee arched outer order interrupts the sill band; eye level recess to right of door and stone step.
Deep late medieval S porch with deep, swept and overhanging eaves, ridge stones, coping and kneelers and deep quoins. Shallow moulded basket arched S doorway has a raised plinth standing on a ledge, hoodmould with plain angled stops and keystone with tree motif; blank rectangular recess above doorway and sundial below decorative apex stone. Inside the porch is broad, with stone benches to sides, stone flagged floor, wall monuments and re-set slab with floriated cross repaired 2 bay arch braced roof with lowered ridge beam; moulded similar S doorway with broached base, small niche above doorway under a relieving arch, stoup with stiff leaf decoration. S nave Perpendicular windows, C19 restorations, either side of porch have 3 lights and voussoirs.
Chancel S has square headed priests' doorway with heavy hoodmould with angel stops and pointed arched hollow chamfered doorway with decorative spandrels; to left a square headed 2-light window with hoodmould continuous with door mould; SE window similar to S nave but smaller and with a surviving hoodmould; weathered wall monument; battered plinth to chancel. Tiered diagonal buttresses of large dressed stone blocks at SE and NE end in bulky finials with crockets; gargoyles at each corner; Perpendicular E window similar to nave; some lime render survives. N windows to chancel and chapel are 2- light square headed.
N side has similar windows on either side of later extensions. The church stands in a large roughly rectangular walled churchyard with main entrance and lychgate SW and additional entrance NE. Churchyard contains monuments of many locally important families, including the Brogdens, founders of C19 Porthcawl and the Knights, the Lords of the Manor, since neither Porthcawl nor Nottage had churches with cemeteries. Also contains graves of many sailors and rescuers drowned in the nearby Bristol Channel, including a group of 3 mid C19 headstones SW of the porch with discursive inscriptions and SE a headstone to James John and his two sons who were sea rescuers and drowned 1839.