Interior
The lofty nave has ashlar walls and a flat-pitched keeled wagon roof continuing to the chancel with a full-height Tudor chancel arch between. The roof has boarded panels and thin ribs. The principals stand on polygonal shafts rising from foliage corbels. The S aisle has a 5-bay Early-English style arcade (built for the C19 N aisle) with piers composed of 4 clustered shafts, moulded capitals and 2-centre arches with 2 orders of chamfers. The taller N arcade is 3 bays with octagonal piers, moulded capitals and 2-centred moulded arches. At the W end is a lower, narrower moulded arch without capitals. The N aisle has a simple lean-to roof. The S aisle has plastered walls except the Lady Chapel where rubble stone is exposed. The roof has arched braces and diagonal struts above collar beams, and is boarded behind the principals. The round-headed tower arch is plastered and probably early medieval. The moulded lancet arch to the Lady Chapel (formerly the chancel arch) is C19 and has no capitals except for an inner order with a moulded capital on a shaft with foliage corbel.
In the chancel is a 4-centred arch to the Lady Chapel set within 2 blind 4-centre arches. The sedilia have vaulted canopies and crocketed finials. The piscina is similar and the basin is contained within a polygonal projection. The N transept houses the organ.
The font is C12 or early C13, a plain square bowl with lobed undersides, on a round pedestal and square base. The tall Perpendicular style font cover is late C19. In the Lady Chapel is a circular pillar piscina with moulded base and block-shaped capital containing the basin. A tall rood screen by Barnard was erected as a memorial to the 1914-18 war and the names of the war dead are carved in relief on the dado. The screen is 5 lights, the central light of double width, and has ribbed coving, a pendant frieze, a cornice of vine trails and shields, and brattishing. Above is a rood image. The S aisle chapel also has a rood screen, commemorating Captain Edward Strich (d 1915), an inscription to whom, with linenfold panelling, forms the dado. The remainder of the screen is composed of a central doorway flanked by 3 Gothic traceried lights, above which is a moulded cornice and brattishing. The pulpit has an inscription at its base but the date is obscured. A shaped, polygonal stone base has blind Gothic panels to the stem and a moulded cornice. The pulpit itself is of wood and richly detailed, with open ogee arches and diagonally set pinnacles. In the chancel, the choir stalls have moulded ends with poppy heads. The communion rail was added c1929 and has panelled, fret-cut balusters and is infilled with ironwork tracery with a moulded hand rail. The rail is wholly replaced in the centre. The reredos, depicting scenes from the Life of Christ in the style of manuscript illuminations, was added in 1951 and is by Faith Craft Works of St Albans.
The windows have glass demonstrating changes in style from the late C19 to late C20. In the traditional style E window of c1929 is Christ flanked by saints Peter and Paul, Asaph, John, David, Deiniol and Woolos. The chancel S wall has a window depicting Faith, Hope and Charity commemorating Isabel Crawshay (d 1863). Glass in the Lady Chapel is dated 1918 and 1923. In the S aisle are windows with allegorical scenes by Curtis, Ward & Hughes of London, dated 1903, and by Joseph Bell, dated 1880. In the N aisle are 3 similar traditional-style windows of c1915, including the Bible story of the loaves and fishes to commemorate the loss of the Mumbles lifeboat in 1903, and Christ walking on water, with a lifeboat below, commemorating the loss of the lifeboat in 1883. Post-war glass is mostly by Tim Smith: In the north aisle is a large representation of the lifeboat and crew dated 1977, and a Remembrance Window of 1989. In the S aisle is commemorative glass entitled 'Adoration of Our Senses' dated 1986. A window dedicated to the Mumbles Railway dated 1982 is in the W wall of the N aisle.