A2Dominion- North Harrow

download as PDF
as PDF
Retrofit of 2 x Semi detached houses via external insulation allowing tenant to remain in residence during construction

Retrofit for the future ZA568E
Images Graphs Figures Description Strategies Building

A2Dominion- North Harrow : Project images

Click on image to preview full size

CO2 emissionsPrimary energy requirement
Energy target
Retrofit for the Future

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 197 kWh/yr 572 kWh/yr -
Natural gas use213 kWh/yr 532 kWh/yr -
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement 5 kWh/m².yr 14 kWh/m².yr -
Annual CO₂ emissions 1 kg CO₂/m².yr 3 kg CO₂/m².yr -
Annual space heat demand - 31 kWh/m².yr -

Renewable energy

Electricity generationForecastMeasured
Photovoltaic panels4 kWh/yr -
solar thermal panels10 kWh/yr -
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
14 kWh/m².yr -
Annual CO₂ emissions
offset by renewable generation
3 kg CO₂/m².yr -

Calculation and targets

Whole house energy calculation method SAP
Other whole house calculation method-
Energy target Retrofit for the Future
Other energy targets-
Forecast heating load 53 W/m² demand


Pre-development air permeability test--
Final air permeability test--

Project description

StageUnder construction
Start date08 March 2010
Occupation date21 April 2010
Location Harrow London  England
Build typeRefurbishment
Building sectorPublic Residential
Property typeSemi-Detached
Construction typeSolid Brick
Other construction typeUninsulated, pebble dashed finish
Party wall constructionsolid brick
Floor area 144.5
Floor area calculation method Treated Floor Area (PHPP)
Building certification

Project Team

OrganisationBreyer Group PLC
Project lead personBreyer Group
Landlord or ClientA2Dominion
ArchitectCole Thompson Anders
Mechanical & electrical consultant ZBP
Energy consultantZBP
Structural engineer
Quantity surveyorBreyer Group
ContractorBreyer Group

Design strategies

Planned occupancy5 x people.
Space heating strategyHigh efficiency gas fired boiler
Water heating strategyAs above plus solar hot water panels
Fuel strategyHigh efficiency gas fired boiler
Renewable energy strategyRoof mounted PV and Solar hot water panels
Passive Solar strategy
Space cooling strategy
Daylighting strategyGlazing position and size as existing
Ventilation strategyPassivent with trickle vents to glazing
Airtightness strategy 4 m3/hr/m2
Strategy for minimising thermal bridges Overlapping insulation. External insulation covering existing building fabric ensures limited thermal bridges
Modelling strategySAP
Insulation strategyExternal insulation throughout, with ground floor insulation to raised ground floor
Other relevant retrofit strategiesReady for immediate roll out. No decant required, no planning permission required, no technologies specified with tenant interaction, no specialist materials of limited availability..
Contextual information

Building services

Space heatingNULL
Hot waterNULL
Renewable energy generation systemNULL
Strategy for minimising thermal bridgesNULL

Building construction

Volume -
Thermal fabric area -
Roof description NULL
Roof U-value 0.00 W/m² K
Walls description NULL
Walls U-value 0.00 W/m² K
Party walls description NULL
Party walls U-value 0.00 W/m² K
Floor description NULL
Floor U-value 0.00 W/m² K
Glazed doors description NULL
Glazed doors U-value 0.00 W/m² K -
Opaque doors description NULL
Opaque doors U-value 0.00 W/m² K -
Windows description NULL
Windows U-value 0.00 W/m² K -
Windows energy transmittance (G-value) -
Windows light transmittance -
Rooflights description NULL
Rooflights light transmittance -
Rooflights U-value 0.00 W/m² K