{"id":729958,"date":"2024-02-22T08:00:14","date_gmt":"2024-02-22T08:00:14","guid":{"rendered":"https:\/\/www.architectsjournal.co.uk\/?p=729958"},"modified":"2024-02-23T08:14:22","modified_gmt":"2024-02-23T08:14:22","slug":"case-study-cosway-street-by-bell-phillips","status":"publish","type":"post","link":"https:\/\/www.architectsjournal.co.uk\/specification\/case-study-cosway-street-by-bell-phillips","title":{"rendered":"Case study: Cosway Street by Bell Phillips"},"content":{"rendered":"

Cosway Street is a 49-home residential development in Marylebone, central London, and forms part of the first phase of Westminster City Council\u2019s Church Street masterplan programme. The council\u2019s brief required that the development should provide a significant dowry to fund the social, economic and cultural aspirations of the wider masterplan transformation and so the site was allocated to private housing, with affordable development provided on neighbouring sister sites.<\/p>\n

The development presented an opportunity to repair a degraded streetscape and create a contextual yet modern addition within the Lisson Grove Conservation Area. We responded to the neighbourhood\u2019s predominantly late Victorian and Georgian architecture with a design featuring scalloped brick fa\u00e7ades that reflect the rhythms and proportions of the neighbouring streets through variations in dimension, depth and tone.\u00a0<\/span><\/p>\n

The development provides a range of apartment sizes arranged within a three-sided perimeter block, which rises to five storeys and frames a new communal garden. Daylight is maximised with double and tripartite windows that sit within the bay rhythm of the fa\u00e7ade. Balcony openings are intended to read as carved apertures in the fa\u00e7ade, adding to the sculptural quality while integrating neatly with the rhythm of windows and providing privacy for residents.
\n<\/span>Hari Phillips, founding director, Bell Phillips<\/i><\/span><\/p>\n

\n

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Project data<\/b><\/h3>\n

Start on site <\/b>March 2021
\nCompletion <\/b>October 2023
\nGross internal floor area <\/b>5,203m\u00b2
\nConstruction cost <\/b>Undisclosed
\nArchitect <\/b>Bell Phillips
\nDelivery architect <\/b>David Miller Architects
\nClient <\/b>Westminster City Council
\nStructural engineer (pre-planning)<\/b> Stantec
\nStructural engineer (post-planning)<\/b> Robert Bird Group
\nM&E consultant (pre-planning)<\/b> Stantec
\nServices engineer (post-planning) <\/b>CBG Consultants
\nMain contractor<\/b> Osborne
\nInterior design <\/b>Amos & Amos
\nPlanning consultant <\/b>Stantec
\nEcology consultant<\/b> Stantec
\nHeritage consultant <\/b>MOLA
\nFa\u00e7ade supplier<\/b> Decomo
\nCAD software used <\/b>Revit
\nAnnual CO<\/b>2<\/sub><\/b><\/span> emissions <\/b>47.3 tonnes CO2<\/sub>\/yr (estimated regulated emissions)<\/p>\n

\n

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Architect\u2019s choices<\/b><\/h3>\n

Cosway Street occupies an entire block within the Conservation Area and its materiality responds to four historic street characters. The dominant material is brickwork, with reconstituted stone details, offering longevity to the fa\u00e7ade. The design features three brick hues, reflecting those of surrounding buildings. A single manufacturer was selected to provide a consistent finish and complementary tones. Vertical hierarchy is introduced by different grades of mortar to create a darker plinth and lighter crown.High-performance windows vary to mirror the scale of fenestration across each street. This subtle application of shifting tones and proportions celebrates the unique material heritage of Lisson Grove.
\n<\/span><\/span>Hari Phillips, founding director, Bell Phillips<\/i><\/span><\/p>\n

\n

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Specification<\/b><\/span><\/h3>\n

Cosway Street is conceived as a sculptural building that offers a highly contextual response to the Lisson Grove Conservation Area, while providing high-quality new homes close to central London.\u00a0<\/span><\/span><\/p>\n

The fluted fa\u00e7ade motif, which echoes the arched windows and circular columns of the adjacent Grade II*-listed church, is repeated at various scales to create a distinctive new building that ripples with visual interest while being rooted in its context. A carefully selected palette of three soft-toned bricks, alongside crisp stone dressings and contrasting mortar shades, splits the building into three distinct sections that respond respectively to the character of a building across the street.<\/span><\/p>\n

The fa\u00e7ades were constructed off-site using precast components faced with brick. Eight panels were installed daily to significantly reduce build time and disruption to the neighbourhood, and to ensure an exceptional finish. The additional depth of the elevations was exploited to provide super-insulated external walls as part of a wider strategy to reduce operational energy.<\/span><\/p>\n

Among the engineering challenges of the scheme was the location \u2013 adjacent to the Bakerloo tube line. Cantilevered piling was designed to ensure the requisite no-build offsets from the tunnel were maintained, while the building sits on anti-vibration pads.
\n<\/span>Hari Phillips, founding director, Bell Phillips<\/i><\/span><\/p>\n

Selected products<\/h3>\n

Brick type A
\n<\/b>Vandersanden
\nLima
\nSouth block fa\u00e7ade, east block fa\u00e7ade, north block fa\u00e7ade
\nvandersanden.com<\/a><\/em>
\n<\/b><\/p>\n

Brick type B
\n<\/b>Vandersanden
\nWoodland Mixture
\nEast block fa\u00e7ade
\nvandersanden.com<\/a><\/em><\/p>\n

Brick type C
\n<\/b>Vandersanden
\nCayenne
\nNorth block fa\u00e7ade
\nvandersanden.com<\/a><\/em><\/p>\n

Reconstituted stone
\n<\/b>Sourced by Decomo
\n<\/i>Ivory White with soft shades of grey-brown
\nCornice, entrance surround
\ndecomo.co.uk<\/a><\/em>
\n<\/b><\/p>\n

Aluminium window frames
\n<\/b>Wicona
\nWicline 75 evo, RAL 7006 Beige Grey
\nWindows
\nwicona.com<\/a><\/em>
\n<\/b><\/p>\n

Steel balustrade
\n<\/b>Sourced by Decomo
\nPPC aluminium, RAL 7006 Beige Grey
\nBalconies
\ndecomo.co.uk<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

The 49-home private housing development in Marylebone, central London, will help fund affordable homes on neighbouring sites<\/p>\n","protected":false},"author":1,"featured_media":729977,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_oasis_is_in_workflow":0,"_oasis_original":0,"ep_exclude_from_search":false},"categories":[721],"tags":[2297,1621,1155,3858,1849],"yoast_head":"\nCase study: Cosway Street by Bell Phillips<\/title>\n<meta name=\"description\" content=\"The 49-home private housing development in Marylebone, central London, will help fund affordable homes on neighbouring sites. 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