16 Broadway Market forms part of a ‘family’ of interventions by Delvendahl Martin Architects which collectively establish a new vernacular language across the vibrant area of Broadway Market in Hackney.
This mixed-use project involved refurbishing the existing ground-floor shop and duplex flat above and constructing a rear extension to provide a new triplex flat. Most of the existing brick structure at the ground-floor level was retained as a plinth for a new lightweight timber-framed extension, the timbers exposed on the interior and clad in light grey standing seam cladding on the exterior.
The shapes of the addition emerged through iterative processes, taking into careful consideration the impact of development on neighbouring properties. The use of light-coloured standing seam aluminium cladding further enhances the reading of the intervention as something new and yet anchored comfortably in its established context. Daylight penetration is maximised by incorporating a central courtyard, which helps set a clear visual definition between the volumes.
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The design takes formal cues from the sequence of existing back buildings, particularly the adjacent No 14 Broadway Market by Peter Barber Architects.
Nikolai Delvendahl, partner, Delvendahl Martin Architects
Project data
Start on site August 2018
Completion May 2020
Gross internal floor area 258m²
Construction cost £685,000
Construction cost per m2£2,650
Architect Delvendahl Martin Architects
Client Private
Structural Engineer PHI Design
Principal designer Delvendahl Martin Architects
CDM co-ordinator BWA
Aproved building inspector AIS
Main contractor Sail & Sons
Party wall surveyor WAND Projects
Fire engineering consultant IFC Group
CAD software used Vectorworks
Predicted design life 50+ years
Architect’s choices
In addition to setting up a new vernacular language in the area, the standing-seam aluminium for the cladding and roofing was selected on the strength of Delvendahl Martin Architects’ familiarity with the product and, critically, our successful experience of collaborating with specialist installers PMF Roofcraft. The use of a flexible plywood, combined with the in-situ fabricated laminated plywood beams, provided an efficient and lightweight structural solution enhanced by the geometry of the roof and expressed internally as the ceiling.
The use of clear-varnished birch plywood for the kitchen cabinets and joinery and bright yellow rubber flooring were selected with the client to provide a warm, welcoming environment.
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Nikolai Delvendahl, partner, Delvendahl Martin Architects
Specification
Environmental considerations played a central role in the design and development of the scheme. The decision to retain and re-use much of the existing building fabric and structure not only harnesses the heritage value of the area, but it also critically contributes to the sustainable regeneration of the current built stock.
New materials and construction systems were selected for their low embodied carbon, including the lightweight timber frame construction of the extension. The characteristic shape of the extension roof was created using laminated plywood beams in combination with softwood timber joists to form a structural grid. A double layer of exposed flexible plywood was used to shape the curved ceiling, expressing the lightweight nature of the construction while minimising the use of plasterboard.
Contrasting with the complex geometry of the extension’s superstructure, a simple material palette informs both cladding and roof external finishes.
The use of standing-seam aluminium cladding echoes the choice of materials in other nearby interventions of similar scale by Delvendahl Martin Architects.
Nikolai Delvendahl, partner, Delvendahl Martin Architects
Selected products
Standing seam aluminium cladding
PREFA
Prefalz, Metallic Silver, installation by PMF Roofcraft
Façade to extension
uk.prefa.com, pmfroofcraft.co.uk
Windows
Viking
Viking DK-88 triple-glazed timber window. External finish Aluclad, RAL 9006
Façade in extension
rationel.co.uk
Curtain walling
Aluprof
MB-SR50N curtain walling, MB-86 Aero window and door, RAL 9006
Internal courtyard
aluprof.eu
Internal finishes
WISA
Birch plywood, clear varnish finish
Kitchen cabinets, stair to mezzanine
wisaplywood.com
Curved ceiling
Latham
Superform Thin Birch Plywood. Two layers of 8mm-thick panels
Curved ceiling in extension
lathamtimber.co.uk
Rubber flooring
Nora
Noraplan uni colour 6179 (yellow)
Floor finishes to extension
nora.com
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