Certifed Passivhaus Retrofit - Totnes Passivhaus

Passivhaus Project: hybrid retrofit and new build extension

One of the UK's first Certified Passivhaus refurbishment projects

Winner of the Passivhaus Trust's 2013 Award for best private housing project

Stay in the Totnes Passivhaus - find out more here - read the build blog - watch the video

Totnes Passivhaus front view
Totnes Passivhaus side view
Totnes Passivhaus bathroom
Totnes Passivhaus window detail
Totnes Passivhaus Entrance
Totnes Passivhaus Kitchen
Totnes Passivhaus Living Roof
Totnes Passivhaus certification plaque
  • Totnes Passivhaus front view
  • Totnes Passivhaus side view
  • Totnes Passivhaus bathroom
  • Totnes Passivhaus window detail
  • Totnes Passivhaus Entrance
  • Totnes Passivhaus Kitchen
  • Totnes Passivhaus Living Roof
  • Totnes Passivhaus certification plaque

Totnes Passivhaus project statistics

Retrofit element: conventional cavity wall construction with high performance external insulation; self-coloured render (wall U-value 0.10W/m²K)

New build element, using natural, breathable materials: Steico timber I-frame with woodfibre and sheepswool insulation, clad in UK sourced, FSC sweet chestnut cladding (average wall U-value 0.11W/m²K), living roof.

Usable floor area (TFA): 162m² | form factor (ext. area/TFA): 2.62 | design space heating demand: 13.3kWh/m² per annum; heating load 9.3W/m²

Ventilation: PHI Certified heat recovery (MVHR), Paul Novus 300 with Lindab Safe ducting

Air tightness: 0.2 air changes/hour on final airtightness test for Certification.

Windows: Internorm Varion/Varion 4, integrated blinds for summertime shading, installed whole window U-value from under 0.85W/m²K, g-value 0.6 on solar gain facades, double e-coated, argon filled.

Renewables: photovoltaics - Mobasolar panels, total 3.99kWp, Fronius IG TL transformerless inverter; solar hot water - Rotex 500 litre thermal store with 9.4m² of integrated roof panels

Construction cost (exc. VAT) per m² gross floor area: ca. £1400

Location: Totnes, Devon | completed in Aug 2011 | certified in Sept 2011.

Stay at this Passivhaus: experience a Passivhaus firsthand. Visit www.passivhausbandb.co.uk for more details.

AECB PHT member © Passivhaus Homes Ltd.
RIBA PH designer