{"id":759825,"date":"2025-03-12T08:07:13","date_gmt":"2025-03-12T08:07:13","guid":{"rendered":"https:\/\/www.architectsjournal.co.uk\/?p=759825"},"modified":"2025-03-12T08:24:03","modified_gmt":"2025-03-12T08:24:03","slug":"case-study-challoner-house-by-hut-architecture","status":"publish","type":"post","link":"https:\/\/www.architectsjournal.co.uk\/specification\/case-study-challoner-house-by-hut-architecture","title":{"rendered":"Case study: Challoner House by HUT Architecture"},"content":{"rendered":"

Challoner House is a renovation project, converting and extending a locally listed building into high-quality office space for an owner-occupier using natural and recycled materials.<\/span><\/p>\n

Originally comprising two townhouses and an iron printing press, the building is situated in the heart of the Clerkenwell Green Conservation area, renowned for its architectural and historic interest. HUT was briefed to sympathetically transform, extend and thermally upgrade the existing building while preserving the building\u2019s character and history.\u00a0<\/span><\/span><\/p>\n

The project commenced by undertaking studies to understand alterations to the building from the original plan form through to its current layout. The original plan form is mapped out in brick tiles within the new offices. Brick arches and historical patina are left exposed and expressed within the renovation works. A section of flooring at ground floor has been removed to create a spacious \u2018town hall\u2019, which connects to the basement. Door and window openings from the original townhouse remain suspended along the elevation at high level to preserve the building\u2019s heritage and contribute to its story.
\n<\/span><\/span>Alicia Sardi, senior architect, HUT Architecture<\/i><\/span><\/p>\n

\n

\u00a0<\/span>\"\"<\/p>\n<\/div>\n

Project data<\/span><\/h2>\n

Start on site <\/b>September 2022
\nCompletion <\/b>September 2024
\nGross internal floor area <\/b>1,738m2
\n<\/sup>Net internal floor area <\/b>1,228m2<\/sup>
\nConstruction cost<\/b> Undisclosed
\nArchitect <\/b>HUT Architecture
\nClient <\/b>Akelius
\nStructural engineer <\/b>Morph Structures
\nCivil engineer<\/b> Morph Structures
\nM&E consultant<\/b> Harley Haddow
\nQS<\/b> Johnson Associates
\nProject manager<\/b> Johnson Associates
\nPrincipal designer <\/b>Peligro
\nApproved building inspector <\/b>Quadrant
\nAcoustic consultant<\/b> Clement Acoustics
\nBREEAM consultant<\/b> Build Energy
\nFire engineer<\/b> Semper Fire
\nMain contractor<\/b> Copper Projects
\nCAD software used<\/b> Revit
\nAnnual CO<\/b>2<\/sub><\/b><\/span> emissions (predicted)<\/b> 43.45 kgCO2<\/sub><\/span>\/m2<\/sup>\/yr\u00a0<\/span><\/p>\n

\n

\u00a0<\/span>\"\"<\/p>\n<\/div>\n

Architect\u2019s choices<\/span><\/h2>\n

Lime hemp plaster was used to thermally upgrade and line the existing solid brick external walls. Selected for its breathability, thermal properties and flexibility, it was ideally suited to the undulating original brick walls in order to improve airtightness. Made from a renewable plant fibre, lime hemp plaster locks in CO<\/span>2<\/sub><\/span> and has a lower embodied carbon than traditional plasters.<\/span><\/p>\n

Selected for its fire-resisting properties and recycled content, Fermacell has been used where possible in place of traditional gypsum board. We actively seek to specify materials that consider their environmental cost and Fermacell has a carbon-negative production process, with 100 per cent recycling \u2018from cradle to gate\u2019<\/span>.\u00a0<\/span><\/span><\/p>\n

Alicia Sardi, senior architect, HUT Architecture<\/i><\/span><\/p>\n

\n

\u00a0<\/span>\"\"<\/p>\n<\/div>\n

Specification<\/span><\/h2>\n

The building was originally constructed from brick and timber. Steel structural members were added at a later date when the individual buildings were amalgamated.<\/span><\/p>\n

The envelope had little to no insulation and required significant thermal upgrades while preserving the historical fabric. Breathable materials \u2013 sheep\u2019s wool, wood fibre board, hemp and lime render \u2013 were selected due to their low embodied carbon, thermal benefits and breathability. Internal walls were constructed using Fermacell, selected for its recycled content, moisture control and fire-resisting properties. The existing steel structure has been reused and repurposed to avoid unnecessary waste. The new butterfly roof is constructed using a glulam ring primary structure, with the vaulted, sculptural form being expressed; creating a strong visual connection to the form and heritage of the original building.<\/span><\/p>\n

Internally, original door and window openings have been left in situ. While they no longer serve a functional purpose, they visually describe the building\u2019s previous uses and layout. The external fa\u00e7ades have been upgraded and now feature double-glazed, timber-framed sash windows in keeping with the heritage while vastly improving the building\u2019s thermal performance<\/span>.\u00a0<\/span><\/span><\/p>\n

Alicia Sardi, senior architect, HUT Architecture<\/i><\/span><\/p>\n

\n

\u00a0<\/span>\"\"<\/p>\n<\/div>\n

Selected products<\/span><\/h2>\n

Lime hemp plaster wall lining
\n<\/b>T\u0177-Mawr
\nLime hemp plaster wall lining
\nExternal walls
\nlime.org.uk<\/a><\/p>\n

Timber sash windows with slim glazing<\/b>
\nOriginal Sash
\nThroughout
\noriginalsash.co.uk<\/a><\/p>\n

Aluminium rooflights
\n<\/b>Glazing Vision
\nPitched and flat Roof Lights
\nglazingvision.co.uk<\/a><\/p>\n

Sliding doors
\n<\/b>Assa Abbloy
\nSlim-Eco 2 Sliding Door
\nMain entrance
\nassaabloy.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Challoner House is a renovation project, converting and extending a locally listed building into high-quality office space for an owner-occupier using natural and recycled materials. Originally comprising two townhouses and an iron printing press, the building is situated in the heart of the Clerkenwell Green Conservation area, renowned for its architectural and historic interest. HUT …<\/p>\n","protected":false},"author":1,"featured_media":760629,"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":[3530,5111,2832,1342,3122],"yoast_head":"\nCase study: Challoner House by HUT Architecture<\/title>\n<meta name=\"description\" content=\"The conversion and extension of a locally listed building in Clerkenwell, London, uses natural and recycled materials to create an office space. 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