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New Cross House
New Cross house is a sustainable refurbishment and extension of a Victorian house in south London. A new two storey timber framed rear extension comprises of a first floor study that embraces views to the mature maple trees at the rear of the garden whilst the lower ground floor creates connectivity between the garden, kitchen, dining and lounge. White oiled timber flooring throughout the house harmoniously connects all the new and existing spaces together, creating a warm and characterful family dwelling.
The project briefing sessions started out by exploring and testing spaces that could cater for 3 teenage children, a homeworking environment and a vibrant social space. The existing kitchen, conservatory and utility were in poor condition and there was no clear connection to the long garden which is elevated from the lower ground floor level. Journeys between existing social and private spaces also felt dark and disconnected.
Our discussions around the client’s Jamaican Heritage and strong connections to nature and well being were important personal stories and struck a chord with our own beneficial experiences of courtyard architecture in Asia. This led us to designing a new intimate courtyard garden as the centre point for the lower ground floor and develop a timber narrative for the extension, kitchen and furniture. Through intricate detailing, the UK grown timber frame extension achieves a lightweight, forest like appearance, rooted in context whilst presenting a global story. A careful balance of different timber species for windows, beams, fronts and furniture ensure a playful and meaningful atmosphere that heightens experiences of light, shadow, sound and touch.
We used timber to mediate between nature, building and the family. The surfaces are inviting to the hands, as are the stair handrails, kitchen handles and bookcase furniture, which form 'an elaborate network of touch'. Finishes are allowed to wear in time imbibing a sense of honesty and expression. Utilising homegrown timbers including English Douglas fir for the entire extension and a contrasting English fumed oak, for furniture and kitchen panels, echo the tropical hardwoods of the Caribbean, whilst also ensuring consideration of locally sourced materials and sustainability.
Joinery and Furniture designed by Poroban and Pinfold Workshop. Windows fabricated by CAB Workshop.
Photos by Ollie Hammick
Details
Structural timber frame and kitchen fronts - Douglas Fir, England
Engineered Flooring - French Oak, manufactured in the UK
Kitchen Backsplash, Bookcases - Fumed Oak, England
Facade Cladding - Larch, England
Dining Table - Cherry, American
Facade Windows - Red Grandis, Uruguay
Staircase - European Oak, France
Roof and Wall Insulation - Woodfibre, Poland/France
Sustainability
Upfront carbon emissions (A1-A5): excluding biogenic carbon
250 kgCO2eq/m2
Stored biogenic carbon:
220 kgCO2e/m2
Operational energy (B6): 80 kWh/m2/yr
Embodied Carbon % improvement against standard construction . TBC
The narrative of timber not only responds to the desired experience of a space, but also has wider contextual impact with regards to sustainability. When designing and constructing the timber frame we ensured that all bolts and fixings were exposed and visible to enable deconstruction at the end of life. Beams and columns were also designed in smaller sections to facilitate re-use and ease of man handling. All new timber elements can be re-used at the end of life, before ultimately ending up back to soil or being chipped for biofuel/chipboarding.
All the kitchen fronts are biscuit jointed and back strapped with visible screw heads to enable repair and re-use at the kitchen's end of life. As an ethos, we did not want to promote laminated products that would deform or delaminate in time.
A zero-concrete ground floor slab built from recycled glass (foamglass) and a limescreed allowed for reduced excavations and higher insulation levels. The entire house and extension was internally insulated using natural woodfibre insulation (for roof and walls) allowing for An air Source Heat pump to be located ontop of the lightweight extension roof. This holistic approach to the construction, with timber as the core element, helped achieve a low carbon building championing the use of UK grown structural timber sourced from sustainable silvicultural managed forests. C18 Graded English douglas fir was sourced from East Brothers in Wiltshire, who are one of the few suppliers that can provide small orders of Kiln dried structurally graded Douglas fir to a machined profile within a 6-8 week lead time. Supply chains are one of the limiting factors to constructing low carbon domestic building and we hope that this project showcases techniques and suppliers that can help change our construction industry to a lower carbon future.
















