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The Crossway Passivhaus is a breathtaking, ambitious and pioneering sustainable family home set within rural Kent countryside. Nestled beneath a soaring 9m high, 20m wide yet only 120mm think terracotta arch crafted from clay dug and handmade within 4 miles of the site is a highly insulated timber frame orientated to maximise passive solar gain and daylighting. Externally the building is complimented by a palette of local clay and timber. These natural materials instil this iconic structure with a strong sense of place. The arched roof supports a native wild-flower meadow roof in 300mm of clay subsoil excavated from the foundations. The interior incorporates an array of natural products and finishes.Crossway is a living, breathing research project which is continuing to help test and develop new sustainable techniques and technologies. Its also a healthy and inspiring family home!
Images Graphs Figures Description Strategies Building

Crossway : 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

Renewable electricity generation This project has used the contributions from renewable electricity generation equipment to either meet the Retrofit for the Future target or otherwise reduce the Primary energy requirement and CO₂ emissions associated with the project.

Measured data from renewable generation is not yet available.

Fuel use

Electricity use - - -
Natural gas use- - -
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement - - -
Annual CO₂ emissions - - -
Annual space heat demand - - 14.82 kWh/m².yr

Renewable energy

Electricity generationForecastMeasured
Renewable electricity-5500 kWh/yr
Other Renewables Tech--
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
--54 kWh/m².yr
Annual CO₂ emissions
offset by renewable generation
--13 kg CO₂/m².yr

Calculation and targets

Whole house energy calculation method
Other whole house calculation method-
Energy target PassivHaus
Other energy targets-
Forecast heating load -


Pre-development air permeability test--
Final air permeability test-0.72m³/m².hr @ 50 Pascals

Project description

Start date
Occupation date01 February 2009
Location Staplehurst Kent  England
Build typeNew build
Building sectorPrivate Residential
Property typeDetached
Construction typeOther
Other construction typeTimbrel vaulted arch & timber frame
Party wall construction
Floor area 255
Floor area calculation method Treated Floor Area (PHPP)
Building certification  Passivhaus certified building Passivhaus certified building

Project Team

OrganisationHawkes Architecture
Project lead personRichard Hawkes
Landlord or ClientMr & Mrs Hawkes
ArchitectRichard Hawkes
Mechanical & electrical consultant Scott Wilson & Cambridge University
Energy consultantAnthony Morgan Newform Energy
Structural engineer
Quantity surveyor
ContractorEcolibrium Solutions

Design strategies

Planned occupancy
Space heating strategy
Water heating strategy
Fuel strategy
Renewable energy strategy
Passive Solar strategy
Space cooling strategy
Daylighting strategy
Ventilation strategy
Airtightness strategy
Strategy for minimising thermal bridges
Modelling strategy
Insulation strategy
Other relevant retrofit strategies
Contextual information

Building services

Space heating
Hot water
Renewable energy generation system
Strategy for minimising thermal bridges

Building construction

Volume -
Thermal fabric area -
Roof description
Roof U-value 0.12 W/m² K
Walls description
Walls U-value 0.12 W/m² K
Party walls description
Party walls U-value -
Floor description
Floor U-value 0.11 W/m² K
Glazed doors description
Glazed doors U-value 0.70 W/m² K installed
Opaque doors description
Opaque doors U-value - -
Windows description
Windows U-value 0.70 W/m² K -
Windows energy transmittance (G-value) -
Windows light transmittance -
Rooflights description
Rooflights light transmittance -
Rooflights U-value -