St John's Wood Underground Station

St John's Wood Station is a single-storey structure occupying the corner of a much larger residential building, which is not of special interest.

The station is a steel-framed building set back from the corner of Finchley Road and Acacia Road, with a forecourt garden bound by brick dwarf walls with concrete coping. It is faced with russet brown bricks on a plinth of polished black granite. The building comprises a central cylindrical drum with clerestory windows of thick glass between concrete mullions, and low flanking curved wings containing shops. A sweeping concrete lintel canopy supports an illuminated fascia displaying the station name, with pole-mounted roundel signs at each end. The original opaque circular light fittings in bronze frames on the canopy soffit survive. The shop fronts have bronze-framed windows. There are curved bronze-framed information signs to each side of the entrance, which retains its original glazed oak doors with bronze glazing bars.

The ticket hall is lined with faience slabs, and a band of biscuit-coloured tiles edged in yellow and brown to the exposed concrete ring beam, with fair-faced brick above. Pale grey tiles frame the doorways and poster spaces, and also run along the skirting. All tiles are replicas of the originals. The ticket hall has a suspended ceiling of cream painted boards in a frame of radiating metal T-sections. Hanging from this are the original spherical opal pendant lamps above the main ticket hall, with opaque circular lights in the lower ceilinged area near the ticket booths. The ticket booth surrounds and counters are brass and include brass microphone fittings with the words 'Speak Here' incised and painted in red; these were added in the 1980s. The ticket hall clock survives.

Two escalators and a central flight of steps link the ticket hall and the platforms. At the top, these are lit by a large curved window with concrete mullions in the rear wall of the circular drum. In the escalator shaft, bronze uplighters provide lighting, each comprising a square base, circular widening fluted stem, and a semi-circular bowl-shaped shade placed at an angle. There are 58 uplighters in total, arranged in pairs on the two balustrades between the escalators and the central steps. The first and last pair comprise an uplighter and an original bronze-framed Underground roundel sign, also on a fluted stem, reading 'To Trains' at the top of the down escalator and 'Way Out' at the bottom of the up escalator. The concourse at the bottom of the escalators retains additional opaque globe lamps.

At platform level, biscuit-coloured tiles line the walls, containing the station name and a coloured roundel repeated in a continuous frieze along the platform. Below the frieze, plain tiles are interspersed with low-relief decorative tiles designed by Harold Stabler. There are seventy-six tiles in eighteen different designs: depictions of famous London buildings (the Houses of Parliament, the Crystal Palace, St Paul's Cathedral and 55 Broadway); the Underground roundel; the Thames represented by five birds over a river; a portrait in profile of Thomas Lord, captioned with his name in capital letters; and ten heraldic emblems representing the London County Council (lion against a cross above a river) and the Home Counties—Surrey (coronet and oak), Middlesex (crown and three swords), Bedfordshire (eagle), Kent (horse), Sussex (martlets), Berkshire (five princesses), Buckinghamshire (swan), Hertfordshire (stag) and Essex (three swords). The Houses of Parliament design is particularly charming, depicting the famous Barry and Pugin building alongside a royal crown, a baronial coronet, and a bowler hat, presumably representing the constitutional makeup of the Palace of Westminster: Monarch, Lords and Commons.

Each platform has nine large wall-mounted Underground roundel signs announcing the station name, complete with feathered directional arrows pointing to the 'Way Out' below and 'Jubilee Line' signs above. All are modern replicas of the originals. On each platform's far-side tunnel wall are small roundels, seventeen in total, again replicas. The platform clocks survive, with roman numerals enclosed in brass casing. There is a bronze staff letterbox on the southbound platform. Both platforms have timber benches set back in recesses.