Compton, Berkshire

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This project involves a radical whole house approach to the refurbishment of a 1950s semi detached property. The idea is to upgrade the thermal performance. Our approach to energy saving and CO2 reduction is to follow a lean-clean-green hierarchy: seeking to minimise heat losses from the propertys thermal fabric and ventilation method; to supply residual space and water heating using replicable, low carbon technology; to minimise lighting and appliance energy loads; and finally to consider micro-generation using proven, renewable energy systems.

Retrofit for the future ZA343S
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Compton, Berkshire : Project images

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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 37050 kWh/yr 3738 kWh/yr -
Natural gas use- - -
Oil use- - -
LPG use- - -
Wood use- - -
Other Fuel - - -
Primary energy requirement 962 kWh/m².yr 97 kWh/m².yr -
Annual CO₂ emissions 227 kg CO₂/m².yr 23 kg CO₂/m².yr -
Annual space heat demand - 57 kWh/m².yr -

Renewable energy

Electricity generationForecastMeasured
PV1671 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 SAP
Other whole house calculation method-
Energy target Retrofit for the Future
Other energy targets-
Forecast heating load -


Pre-development air permeability test-4.19m³/m².hr @ 50 Pascals
Final air permeability test-2.54m³/m².hr @ 50 Pascals

Project description

StageUnder construction
Start date01 March 2010
Occupation date26 July 2010
Location Compton Berkshire  England
Build typeRefurbishment
Building sectorPublic Residential
Property typeSemi-Detached
Construction typeMasonry Cavity
Other construction type
Party wall constructionSolid masonry
Floor area 96.3
Floor area calculation method Treated Floor Area (PHPP)
Building certification

Project Team

OrganisationECD Architects
Project lead personEnergy Conscious design, Studio 3, Blue lion Place 237 Long Lane, London SE1 4PU
Landlord or ClientSouthern Housing Group, PO Box 643 Horsham, West Sussex RH12 1XJ
ArchitectEnergy Conscious design, Studio 3, Blue lion Place 237 Long Lane, London SE1 4PU
Mechanical & electrical consultant Environmental Design Associates, 31 Wick Road, Teddington, Middlesex, TW11 9DN
Energy consultantECD Project Services, Studio 3, Blue lion Place 237 Long Lane, London SE1 4PU
Structural engineerCarter Clack Partnership, 49 Romney Street, Westminster, London, SW1P 3RF
Quantity surveyorThe Keegans Group, Studio 2, 193-197 Long Lane, London, SE1 4PD
ConsultantPublic Participation, Consultation and Research, Studio 2, 193-197 Long Lane, London, SE1 4PD

Design strategies

Planned occupancyExisting Tennants - Family, 2 adults and 2 children.
Space heating strategyHeating will be provided by a Ground source heat pump and new radiator system. Heat will be recovered from exhaust air via the use of mechanical ventilation with heat recovery unit.
Water heating strategyHot water will be provided by solar thermal panels and large capacity thermal store with a ground source heat pump as backup..
Fuel strategyElectricity
Renewable energy strategyOnsite electric production by 1.4 kWp photovoltaic panels and solar thermal.
Passive Solar strategyWindow fenestration has been simplified in proposed replacement windows to maximise solar gain.
Space cooling strategyHRV with summer bypass combined with natural ventilation for summer period. Night purging during heat waves.
Daylighting strategyWindow fenestration has been simplified in proposed replacement windows to maximise day light.
Ventilation strategyHeat recovery ventilation and additional natural ventilation by opening windows during summer months as required.
Airtightness strategy All existing vents and chimneys blocked up. New air barrier created by OSB board at ceiling level with taped joints and perimeters taped to masonry walls and plastered over. Service void created bellow this to eliminated penetrations. Windows, floors, junctions and all penetrations sealed with proprietary air tight tapes, membranes and grommets. All voids such as cavities filled to mitigate thermal bypass.
Strategy for minimising thermal bridges Continuous insulation maintained throughout. Geometric thermal bridges minimised. Junctions assessed include: Ground floor junction, external corner, party wall, party roof, party floor, eaves, verge, window jamb, head and sill, door jamb, head and threshold.
Modelling strategyWhole house modeling was undertaken in SAP, with the use of extension sheet produced for this competition. Dynamic simulation was used to assess the impact of our proposed micro CHP heating system with the results fed back into the SAP extension sheet.
Insulation strategy- The solid ground floor slab will be left un-insulated to minimise tenant disruption. - The existing walls will be clad externally with an insulated render system to give a U-value of 0.15 w/m2K. - The existing windows will be replaced with high perfo
Other relevant retrofit strategiesWe propose to fit an intelligent heating controller designed to save energy and improve comfort in residential buildings. The system controls both central and water heating, reducing energy consumption by automatically monitoring and learning occupant behavior and preferences. It also provides an easy to use and simply user interface as well as covering all energy monitoring requirements. Also the works will be carried out with a tenant in-situ, a common issue with retrofit works.
Contextual informationA large proportion of the UK housing stock consists of semi detached houses with gardens in suburban or rural locations. There are still many places in the UK which have no supply of mains gas, in particular rural villages such as Compton in Berkshire. Manor Crescent is a house which has already undergone Decent Homes improvements but does not presently provide satisfactory living conditions. Works such as window replacement and loft/cavity wall insulation have previously been carried out in a piecemeal fashion and have resulted in condensation and mould growth and the tenant reports less than satisfactory comfort levels

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