12, Devonshire Street W1

No. 12 Devonshire Street is a town house built between 1912 and 1914 by Sydney Tatchell. It features a Portland stone façade and a slate roof, designed in a strongly modelled "Dixhuitieme" French pavilion style. The building has two main storeys and a dormered mansard roof, with a basement below.

The façade is three windows wide, with a set-back entrance bay to the right. The bolection moulded doorway is decorated with garlands and a mask keystone, topped by an elliptical fanlight framed in an architrave that also has a keystone. The tall ground floor windows have recessed glazing bar casements and balustrading below the sills, positioned between prominent panelled piers that are crowned with festoon-enriched vases at the first floor level. Above the window heads, there is cornice moulding, with panels and fret-ornamented bands, finished with low cast iron ornamental guards over the first floor recessed casements. The first floor window above the doorway has a similar iron guard, and its corbelled sill is swagged.

The building is topped with a dentil crowning cornice and a balustraded parapet, which is solid over the entrance bay and features panelled dies capped by stone vases. The dormers are also corniced. Additionally, there are cast iron area railings with Vitruvian scroll ornamentation running between stone piers. This property is part of an early 20th-century effort by the Portland Estate to restore the domestic character of an area that had become overly professional.