King William IV Public House

The King William IV Public House is a public house built around 1830-1837. It is constructed of stock brick with a stone cornice and band, and the roof is not visible behind the parapet. The building features a five-bay elevation facing Perrin's Lane and a three-bay return to Hampstead High Street.

The structure has three storeys and cellars. It showcases a moulded stone cornice and a flat band on the first floor. The five-bay elevation to Perrin's Lane has projecting ends, while the intermediate bays are blind on the upper storeys, with recesses designed to resemble the surrounding windows, complete with gauged brick heads and stone sills. The second-floor windows and the central window on the first floor have sashes with glazing bars, while the first-floor windows on either side feature long casements that open onto cast-iron balconies. All first-floor windows are equipped with external louvred shutters.

On the ground floor, there are tripartite sash windows at the projecting ends, and the central area is designed as a symmetrical shopfront with a pair of bowed windows featuring small panes with pointed tops, flanked by heavily moulded panels beside double entrance doors. These doors are set beneath a broad rectangular top light with tracery made of intersecting circles. The elevation facing Hampstead High Street is similar, with sashes on the ground and second floors (the centrepiece of the latter is blind) and first-floor casements with shutters leading to balconies. There is a central door surrounded by a moulded architrave.

Inside, the public house comprises four main bars linked by archways and 20th-century screens, served by a central 20th-century bar counter. The walls feature some tongue and groove panelling, mostly replicated in the bar areas during the late 20th century, but better preserved on the stairs leading to the first floor. There are also early 20th-century fireplaces.

The King William IV Public House is noted as a prominent and well-preserved example of an early 19th-century public house, with little alteration to its exterior.