How to Save Energy and Money by Improving Your Home in Coventry and Warwickshire

Energy Saving Case Study 15

Thr property
Thr property
Condensing combination boiler
Condensing combination boiler
External wall insulation
External wall insulation
Loft insulation
Loft insulation

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Location: Warwickshire
House Age: Post War (1940 - 1970)
Bedrooms: 1-4

Energy Saving Improvement 1

Type: Boilers
Contractor: Homeworks Energy
Description: Glow Worm Flexicom 30 cx gas boiler
Cost: £0 (£2,000 in 2013)

Energy Saving Improvement 2

Type: Solid Wall Insulation
Contractor: Homeworks Energy
Description: 100mm urethane foam boards fixed to existing external wall surface with an acrylic render finish
Cost: £0 (value £9,000 in 2013)

Energy Saving Improvement 3

Type: Loft Insulation
Contractor: Unknown
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.

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