Summerfold, The Spinning Walk

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A detached house to the Passivhaus standard, built in a traditional style in keeping with the village vernacular. Offsite closed panel timber frame construction on an ICF basement.
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Summerfold, The Spinning Walk : Project images

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CO2 emissionsPrimary energy requirement
Energy target

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions

Measured data from renewable generation is not yet available.

Fuel use

Electricity use - 2500 kWh/yr -
Natural gas use- 6000 kWh/yr -
Oil use- - -
LPG use- - -
Wood use- 1500 kWh/yr -
Other Fuel - - -
Primary energy requirement - 80 kWh/m².yr -
Annual CO₂ emissions - 15 kg CO₂/m².yr -
Annual space heat demand - 15.3 kWh/m².yr -

Renewable energy

Electricity generationForecastMeasured
Renewables Technology--
Other Renewables Tech--
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
80 kWh/m².yr -
Annual CO₂ emissions
offset by renewable generation
15 kg CO₂/m².yr -

Calculation and targets

Whole house energy calculation method PHPP
Other whole house calculation method-
Energy target PassivHaus
Other energy targets-
Forecast heating load 8.5 W/m² demand


Pre-development air permeability test--
Final air permeability test13 June 20140.45m³/m².hr @ 50 Pascals

Project description

StageUnder construction
Start date01 March 2013
Occupation date25 July 2014
Location Shere, Guildford Surrey  England
Build typeNew build
Building sectorPrivate Residential
Property typeDetached
Construction typeSoftwood frame
Other construction typeBlown cellulose insulation with cavity face brick/stonework
Party wall construction
Floor area 185.5
Floor area calculation method Treated Floor Area (PHPP)
Building certification  AECB silver standard certified building AECB silver standard certified building

Project Team

OrganisationCocreate Consulting
Project lead personWill South
Landlord or ClientLow Energy Developments
ArchitectJAG Architechs
Mechanical & electrical consultant subcontractor design
Energy consultantCocreate Consulting
Structural engineer
Quantity surveyor
ContractorLow Energy Developments, Ecohomes (Ireland), Integraspec ICF

Design strategies

Planned occupancyBetween 2 and 6 full time residents, design amended during construction for 2 full time residents.
Space heating strategyCondensing gas fired system boiler feeding a thermal store and steel panel radiators.
Water heating strategyCondensing gas fired system boiler feeding a thermal store. Radial microbore distribution pipework.
Fuel strategyMains Gas
Renewable energy strategyNone
Passive Solar strategyLarge double storey lightwell to ground floor and basement to make use of limited solar gain to site.
Space cooling strategyLarge deciduous tree in front of house. Secure openings to quiet and private gardens, and rooflight at the top of stair well.
Daylighting strategy
Ventilation strategyBrink Renovent 300 Ventilation with heat recovery. Manifold and semi-flexible ductwork distribution
Airtightness strategy 15mm OSB with junctions taped
Strategy for minimising thermal bridges
Modelling strategyPHPP
Insulation strategyICF basement with additional external EPS. I-joist timber frame by Ecohomes above ground, fully filled with Cellulose insulation blown on site. Cold roof with blown Cellulose insulation.
Other relevant retrofit strategies
Contextual informationVery strict local planning laws in the Surrey Hills AONB and green belt. Site gently slopes to the North and has excellent views in this direction.

Building services

Occupancy2 residents full time
Space heatingSEDBUK A rated mains gas condensing system boiler feeding thermal store. Flat panel radiators.
Hot waterSEDBUK A rated mains gas condensing system boiler feeding thermal store. Plastic microbore radial distribution from manifold next to tank.
VentilationWhole house ventilation with heat recovery (MVHR). Passivhaus Certified Brink Renovent 300 unit (84% efficiency). Distribution to manifold and semi flexible U-bink ducting. Recirculating cooker hood in kitchen.
ControlsThree stage fan controller in plant room.
CookingGas hob and electric oven
Renewable energy generation system
Strategy for minimising thermal bridges

Building construction

Storeys 3
Volume 528
Thermal fabric area 568
Roof description Half 'room in the roof' truss roof, fully filled with blown cellulose insulation.
Roof U-value 0.09 W/m² K
Walls description Basement ICF with additional EPS external insulation. Above ground closed panel timber frame fully filled with blown cellulose insulation. Cavity and face brick/stone work, hung tiles to first floor.
Walls U-value 0.09 W/m² K
Party walls description
Party walls U-value -
Floor description Floating structural raft using EPS formwork foundation system.
Floor U-value 0.11 W/m² K
Glazed doors description Rationel french doors
Glazed doors U-value - installed
Opaque doors description
Opaque doors U-value 1.40 W/m² K installed
Windows description Rationel Aura windows
Windows U-value 0.90 W/m² K installed
Windows energy transmittance (G-value) 50 %
Windows light transmittance -
Rooflights description Fakro U6 triple glazed rooflight
Rooflights light transmittance 50%
Rooflights U-value 1.14 W/m² K