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Tethera

Aerial view courtesy Lunar AI

Replacement of an existing worn out bungalow in the Lake District with a new build Passivhaus holiday home.

Existing:

  • Stunning location on north shore of Ullswater with view across lake to Hallin Fell.

  • Existing bungalow built in late 1950s as staff accommodation for Outward Bound Centre; no architectural merit, modular build, no insulation, cold and damp.

Brief:

  • New home to have three bedrooms, oriented to take advantage of views.

  • Simple form, highly energy efficient, low maintenance, robust.

Planning:

  • Located in World Heritage Site of National Park.

  • Replacement build to have similar footprint form and materials as existing property.

  • Full permission granted August 2020.

Proposals:

  • New home to have three bedrooms, oriented to take advantage of views.

  • Exceptional location and lake views have driven design concept.

  • Simple rectangular, pitched roof form sits comfortably in the context.

  • Improved accessibility by lowering internal floor level has allowed sufficient height for additional mezzanine floor at one end.

  • Designed to certifiable Passivhaus Classic standard.

  • Triple glazed windows and doors; quad glazed rooflights; larger windows on south and west elevations to maximise winter heat gain.

  • Entirely timber frame, built as pre-fabricated and insulated panels in local factory.

  • Roof and wall U-value 0.090W/m2K.

  • Isoquick insulated raft and 60/40 concrete slab U-value 0.10W/m2K.

  • Integrated in-roof PV panels powering Givergy battery storage, Mixergy dhw cylinder, radiant heating panels, Myenergi EV charge point.

  • Full mechanical ventilation with heat recovery (MVHR).

Progress:

  • Demolition and site clearance started in January 2021.

  • Isoquick insulation installed in half a day.

  • Concrete poured February 2021.

  • Timber frame panels erected, windows installed, first fix started March 2021.

  • Intermediate airtightness test achieved n50 of 0.14 ach/h in April 2021 with all penetrations complete.

  • First fix and plasterboard completed by mid May.  External render carrier boards, roof slating and PV panels mostly complete by mid May.

  • June: plastering, decorations, tiling and kitchen installed.

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Existing bungalow
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Oops
Ground floor plan
First floor plan
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Isoquick installation 10am
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Isoquick installation 2pm
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Ready for concrete.
Concrete. 40% GGBS replacement
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Frame panels from Eden Insulation
That view
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Frame panels took a day and a half to erect and make weathertight
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View from A592
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Hidden gutters span end to end
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1st fix complete, ready for plasterboard
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Craftsman at work
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Much as though we liked the green Smartply Propassiv OSB, we prefer the plasterboard
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Plastered