Energy Saving Case Study 15
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House Age: Post War (1940 - 1970)
Energy Saving Improvement 1
Energy Saving Improvement 2
Energy Saving Improvement 3
Type: Loft Insulation
Description: Loft insulation topped up to 200mm using glass fibre quilt
Cost: £0 (value £250 in 2008)
Energy Saving Improvements Details
This is a 3 bedroom semi-detached house dating from the 1950s. It was built by the local council for social housing but is now owned by the householder. It is a “System” built property with “no-fines” concrete walls, solid floors, a pitched roof, has a mains gas supply and is located near the centre of a small village.
It its original condition the house would have scored SAP47 in EPC band D and is estimated to have required 355kWh/m2 of gas for heating and hot water, producing 5.4 tonnes CO2 and costing £1,136 per year.
The loft insulation was increased a few years ago so that it is now 200mm thick and this has resulted in a reduction in the heating load of 14.8%, saving 0.8 tonnes CO2.
The property was included in a pilot scheme in 2013 run by the County Council and was amongst a number of homes fitted with external wall insulation at the same time. This reduced the energy requirement to 210kWh/m2 and carbon emissions to 3.2tCO2. A new condensing combination boiler was also installed as part of the scheme to replace the previous one which was over 20 years old. This achieved a further energy reduction, bringing the total saving up to 53.7% based on the EPC assessment.
The householder was already considering renewing the windows and brought this forward so they were installed before the external wall insulation was applied. This saved a further 0.3 tCO2 bring the total saving from energy efficiency measures to 59.3%.
This indicates that a difficult to heat home can achieve significant savings with a number of different improvement measures applied. The house now achieves an energy efficiency rating of SAP74 in band C with a combined heating and hot water energy cost estimated to be no more than £550 each year. The annual environmental impact of the property has reduced from 5.4 to 2.2 tonnes CO2.