Extended 1920s semi-detached house

Construction: 1920s semi with filled cavity walls and a modern cavity wall extension

Key Features:  A well insulated house (cavity walls, loft and floor) with double glazing, condensing gas boiler and solar PV

The owner extended the house in 2012, creating a larger kitchen and dining area and additional bedroom above. One of their key motivations in making improvements was to reduce their carbon footprint. They commented that the resulting savings on their bills ‘have been a welcome bonus’!

As with this owner, moving into a new house gives the opportunity to make energy efficient improvements, so that a new boiler with modern controls was fitted, and new double glazed windows replaced the old and draughty ones. Other works, such as topping up the loft insulation and insulating under the suspended timber living room floor, were DIY. The cavity walls were filled at no cost, with a grant from the energy company. Once the insulation and heating was complete, the south-facing roof meant that solar pv made sense as a renewable energy option, and a 2.5 kwp system was installed.

The improvements that have been made so far have improved the homes Energy Performance Certificate from a band D rating of 56 up to a B rating of 84.

‘My advice would be to find out what the financial gains might be for making energy efficient improvements to your home. ‘Going green’ doesn’t mean making sacrifices! Be interested in whatever works for you. For example the capital outlay for a solar PV system is less than for a new car, and over time you will also get your money back!’

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For additional information about the impact of each of the improvements for this case study, click on the individual “related opportunities”