Eco Extension | Sussex
A low-energy transformation with panoramic views of the South Down
Maria & Frank relocated from London to Sussex in search of a more sustainable lifestyle. Their new home—a modest 1960s detached house—had great potential but was outdated, poorly insulated, and expensive to run. They approached us to reimagine it as a warm, efficient, and future-proofed home that better connects to the landscape.
Our design strategy focused on thermal performance, modern living, and capturing the site's best asset: the spectacular views of the South Downs.
We proposed a two-storey extension to the south, introducing a light-filled living room, a master bedroom, and a library—each oriented to take in the sweeping rural views. A single-storey lobby extension to the north accommodates a new staircase and provides a practical buffer to the main living areas.
The new timber-framed extensions are super-insulated with natural cellulose and built to high airtightness standards. The existing house will be thermally upgraded with external wall insulation, a new rendered finish, and a zinc roof integrated with solar PV panels. The outdated oil-fired boiler will be replaced with a modern air-source heat pump, slashing carbon emissions and reducing energy bills.
The result is a comfortable, low-energy home that blends modern living with deep sustainability—perfectly aligned with Maria & Frank’s lifestyle goals.
"Mark came up with a wonderful design which maximises the natural attributes of our rural site”
Geoff & Gail Aucock
“Mark’s contribution has been invaluable. I have recommended him to others and I would be happy to work with him again”
Ruth Stoton
“Mark has been very straight-forward and professional and has given me sound practical advice.”
Roger Ross
“Working with Mark was a fantastic experience from start to finish. We couldn't have been happier with the end result.”
Andrew & Emma Wilkie
"It's his quiet confidence that makes you feel more confident about what it is you’re doing. We would definitely recommend working with Mark from Koru."
Adele O’Hehir
"Koru Architects have been a 'breath of fresh air’ in helping me develop my concept and taking this through to design."
Gino Fox
"Mark’s designs have been very innovative, making good use of a difficult site. His service has pleased me enormously!"
Herb Etkin
Ready to discuss a project? Get in touch today.
01273 204065
info@koruarchitects.co.uk
Studio 221, 91 Western Road,
Brighton and Hove, BN1 2NW
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