Passivhaus Affiliate

First certified Passivhaus in Cumbria

Stoneworks Garth is a compact detached 4 bedroom Passivhaus of timber frame construction. It is designed to reflect local Cumbrian farmhouse style but has a contemporary feel. To the south, large floor to ceiling windows catch the sun, with shading provided by a brise soleil.

On the roof, 4kw of solar PV panels provide electricity. Space heating and hot water is provided by an air source heat pump connected to several radiators with a small wood-burning stove for further heating options.

Stoneworks Garth, south elevation. Image credit - Eco Arc Architects

The house was awarded certification in August 2015, and is constructed from a pre-insulated timber frame build method, employed by Eco Arc Architects, Alan Clarke, Eden Insulation and Ecological Building Systems.

An interview with the new owners can be viewed below.





Plasterboard, Vapour block lining board, 300mm Warmcell 500, 40mm Gutex multitherm cavity and rendered blockwork. U-value = 0.103 W/m2K


Plaster board, ceiling substrate board, 600mm Warmcell 300 to bob tail truss rafter roof with slate covering. U-value = 0.067 W/m2K


Engineered oak, reinforced concrete, 300mm Isoquick insulated raft on stone piles. U-value = 0.143 W/m2K

Windows & doors

Timber/aluminium. U-value = 0.69 W/m2K. G-value = 0.53


Predicted performance

Thermal energy demand

12 kWh/m2.yr

Thermal energy load

8 W/m2

Primary energy demand

101 kWh/m2.yr

Airtightness, n50

0.3 ach@50 pascals


Key team


Cheryl Hitchcock & Dudley Thompson


Andrew Yeats, Eco Arc Architects


Alan Clarke (M&E)


Alan Brockbank, B&H Construction
Trevor Lowis, Eden Insulation

Structural engineer

Tweddell and Slater (below ground)
Eden Insulation (above ground) 


WARM: Low Energy Building Practice

16th September 2015

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