Decorating Cumberland Terrace

Cumberland Terrace was designed by John Nash and built between 1826 and 1828 by William Mountford Nurse, one of Nash's preferred builders. Named after Ernest Augustus, Duke of Cumberland (later King of Hanover), the terrace was intended to face a proposed royal pleasure palace that Nash envisaged for the centre of Regent's Park — a scheme that was never realised but which explains the extraordinary ambition of the terrace's design. At over 800 feet in length, Cumberland Terrace is the grandest of all the Regent's Park terraces, its centre block crowned by a massive triangular pediment filled with terracotta statuary representing Britannia surrounded by the arts and sciences. The terrace was conceived as three distinct blocks linked by triumphal arches, creating a composition that evokes the garden facades of Versailles or the Hermitage in St Petersburg. Nash's intention was frankly scenographic: the terrace was designed to be viewed from across the park, its creamy stucco facades shimmering above the tree line like a palace in an Arcadian landscape. The original houses were substantial but not exceptional in their internal arrangements — Nash's genius lay in the facade rather than the plan. The terrace was extensively restored in the 1960s and 1970s under the direction of Sir Denys Lasdun, who retained the facades while reconstructing the buildings behind them as modern apartments. This approach, pioneered at Park Crescent, proved successful and has since been adopted for other Nash terraces. The Crown Estate continues to manage the terrace, maintaining its facades to the exacting standard that Nash's masterwork demands.

The decoration of Cumberland Terrace represents perhaps the most significant ongoing maintenance project among the Nash terraces, given the facade's scale and complexity. The Crown Estate's specification mandates Keim mineral silicate paint for all stuccoed surfaces, applied in the warm cream tone designated 'Nash Cream' that has become the standard for the Regent's Park terraces. The mineral silicate system is essential because it bonds chemically with the hydraulic cement render, avoiding the catastrophic delamination that conventional film-forming paints undergo on these substrates. Application requires meticulous preparation: all loose or hollow render must be cut out and replaced with compatible repair mortar, and the surface must be clean, sound, and uniformly absorbent before paint application. The sculptural elements in the pediment require particular care, as the Coade stone has a different porosity from the surrounding Roman Cement and may require a different dilution ratio of the mineral silicate paint to achieve uniform colour and sheen. The cast-iron column cores must be inspected for corrosion at regular intervals, with any corroded sections treated by localised render removal, mechanical de-rusting, application of rust-inhibiting primer, and careful re-rendering. The balustraded parapet demands periodic inspection for water ingress, which can penetrate the concealed roof structure and cause internal damage before becoming visible externally. Lead flashings at parapet level must be maintained using traditional rolled and bossed techniques, and modern mastic sealants should be avoided. Timber sash windows, replaced during the 1960s-70s reconstruction, require maintenance with traditional linseed oil paint systems in off-white to match the stucco tones.