Eco Extension, Sussex

External wall and roof insulation upgrade.
Solar PV panels and air-source heat pump.


The Challenge

Maria & Frank moved down to Sussex from London in persuit of a more sustainable lifestyle. The modest 1960's detached home they bought desperately needs to be thermally upgraded to reduce running costs and will need an extension to capitalise on the views of the South Downs.

Our approach

Our solution is to place a two-storey extension on the south side creating a new living living room, master bedroom and library with extensive views to the South Downs. A single-storey lobby extension on the north side allows a new spacious staircase to be accommodated.


Sustainable features

The new timber-framed extensions will be super-insulated with natural cellulose and the existing fabric of the house will be upgraded with external wall insulation and render and a new zinc roof with integrated solar PV panels. The old oil-fired boiler will be replaced with a modern and efficient air-source heat pump.

"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

Studio 221, 91 Western Road,
Brighton and Hove, BN1 2NW


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