Old Dover Road

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Whole house retrofit and formation of new habitable roof structure
Images Graphs Figures Description Strategies Building

Old Dover Road : Project images

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CO2 emissionsPrimary energy requirement
Energy target
AECB Silver

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 - 74 kWh/yr -
Natural gas use- 172 kWh/yr -
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement - 2 kWh/m².yr -
Annual CO₂ emissions - - -
Annual space heat demand 139 kWh/m².yr 30 kWh/m².yr -

Renewable energy

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

Calculation and targets

Whole house energy calculation method PHPP
Other whole house calculation method-
Energy target AECB Silver
Other energy targets-
Forecast heating load 16 W/m² demand


Pre-development air permeability test27 April 20157.94m³/m².hr @ 50 Pascals
Final air permeability test01 September 20161.79m³/m².hr @ 50 Pascals

Project description

Start date
Occupation date
Location Canterbury Kent  England
Build typeRefurbishment
Building sectorPrivate Residential
Property typeDetached
Construction typeMasonry Cavity
Other construction type
Party wall construction
Floor area 163.6
Floor area calculation method Treated Floor Area (PHPP)
Building certification  AECB silver standard certified building AECB silver standard certified building

Project Team

OrganisationConker Conservation Ltd
Project lead personPaul Mallion
Landlord or ClientJoy and Nick Shaw
ArchitectConker Conservation Ltd
Mechanical & electrical consultant Built Environment Technology Ltd
Energy consultantConker Conservation Ltd
Structural engineerSCGreen Ltd
Quantity surveyor
ContractorRichard Walder Carpentry Developments Ltd

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

Occupancy2 persons plus guests
Space heatingCondensing gas boiler firing underfloor heating to ground floor, and heated towel rails to wet rooms. Radiators to new bedroom and study in new roof.
Hot waterHot water cylinder with rigid foam insulation and metal jacket.
VentilationVent Axia Sentinel Kinetic Plus B with inline frost unit, rigid PVC ductwork and attenuators.
Controls7 day programmer and thermostats to each area with underfloor heating.
LightingLED downlight
Renewable energy generation system
Strategy for minimising thermal bridgesInsulated cornice used in rooms where existing roof retained. To perimeters of whole house external XPS insulation taken down from DPC to top of foundations.

Building construction

Storeys 2
Volume 477
Thermal fabric area 53167
Roof description I joists 300mm deep fully insulated with recycled denim, overlaid with 52mm dense wood fibre boards. underlined with 11mm OSB.
Roof U-value 0.13 W/m² K
Walls description Existing block/block cavity walls with original 50mm injected mineral wool insulation, topped up and replaced where missing. Upgraded with 150mm graphite EPS external insulation system with acrylic render system.
Walls U-value 0.15 W/m² K
Party walls description
Party walls U-value -
Floor description Original floor of 150mm concrete slab with 50mm EPS insulation under screed. Upgraded with 50mm PIR foil faced insulation, and a dry screed/underfloor heating board.
Floor U-value 0.27 W/m² K
Glazed doors description Timber aluminium composite triple glazed
Glazed doors U-value 0.87 W/m² K uninstalled
Opaque doors description Insulated timber panels
Opaque doors U-value 0.90 W/m² K uninstalled
Windows description Timber aluminium composite triple glazed, outward opening with aluminium cills
Windows U-value 0.87 W/m² K uninstalled
Windows energy transmittance (G-value) 0.53 %
Windows light transmittance -
Rooflights description Triple glazed units in timber frame with insulated external aluminium cladding, and aluminium external solar blackout blinds
Rooflights light transmittance 0.44%
Rooflights U-value 0.92 W/m² K