Exterior

The chapel is built in buff sandstone with a grey slate roof. Internally the stone is in pink and buff bands. Its plan consists of a five-bay nave that is continuous with a three-bay chancel.^[1] The chancel terminates with a three-sided apse containing the altar. The chapel is oriented with the altar at the west end. The last bay at the east end constitutes a narthex (ante-chapel) with a gallery. On the south of the chapel is a tower which is free-standing, but joined to the chapel at the lower two storeys, and by a bridge above. At the southeast corner is a staircase turret. On the south side of the nave and in the apse are two-light windows and at the east end behind the gallery is a four-light window.^[4] The tower has six stages and contains tall lancet bell-openings.^[1] Above these is the clock stage, corbelled out from the shaft of the tower and surmounted by pinnacles at each corner.^[4] On each side is a clock face made from vitreous enamel; each clock face is 9 feet 8 inches (2.95 m) in diameter.^[2] Over this is a spire decorated with gables and pinnacles. The staircase turret is surmounted by a spire.^[1]

Interior

The narthex at the east end has a groin vaulted oak roof, and is paved with black marble and with encaustic tiles. A stone screen leads into the nave. This also has a groin vaulted roof, but built in stone. Between the nave and the chancel is a low alabaster screen. A continuation of this screen leads to the pulpit: this is also constructed in alabaster with Devonshire marble columns. The reredos and the font are also made in alabaster. The benches in the nave and chancel are in walnut and have carved ends. In the chancel is a recumbent effigy in alabaster of Constance, 1st Duchess of Westminster, by Joseph Boehm. For the effigy, Boehm worked from plaster casts of the face and hands taken after her death.^[5]

The stained glass in the windows of the south side of the nave and the apse, and the mosaics in the blank on the north side of the nave were designed by Frederic Shields. These were commissioned in 1876 and made by Heaton, Butler and Bayne.^[4] The two-manual organ is in an alcove on the south side of the chancel.^[6] It was built in 1870–71 by Charles Whiteley of Chester and is still in good working order. The clock tower contains a carillon of 28 bells which were cast by Chavalier Severian Van Aerschodt of Louvain; it plays 31 tunes. The clock was manufactured by Gillet's of Croydon.^[2]