1920s Extension and Retrofit: Still Enjoying the Fresh Air – Impington

Sat 24 Sep 2022, Various

Meet your hosts, Hannah and Joe

Hannah and Joe have retrofitted and thoroughly insulated their 1920s home, adding on a large extension which nearly doubled the footprint of their home. Despite the extra space they’ve managed to reduce their heating bills significantly. Hannah and Joe say that their well insulated home is cheaper to run, but the biggest benefits are non-financial. Hannah likes fresh air, and before they installed the mechanical ventilation heat recovery system, she’d be inclined to open lots of windows, even in the winter. Now the house is a comfortable temperature and full of fresh air year round, and importantly for them, it felt good making sure that everything was energy efficient.

Hannah and Joe say: “We moved into the property knowing that it had been somewhat neglected for many years, but it had a lot of potential. The original house was cold, draughty, expensive to heat and too small for a growing family, so we started planning an extension. As part of that we wanted to do as much as possible to improve the insulation of the existing part of the property as well as create a warm, comfortable family home that was cheap to run and had as small an environmental impact as possible.”

PDF case study with more details of this retrofit

Key Features of this home

• 2.2kW solar PV system
• DIY fitted mechanical ventilation & heat recovery (MVHR) system
• Internal PIR insulation fitted DIY with the warm batten method
• External wall insulation
• Mineral wool underfloor insulation under suspended floor
• New walls built to better than building regulations (timber frame, mineral wool insulation and PIR)
• Mixture of double and triple glazing
• Brise soleil sun shading to reduce overheating
• All south facing windows either shaded, or fitted with solar reduction film

Tour details

1 hour in-person tour with a maximum of 8 people per tour, running:

• Sat 24 Sep, 11.00am
• Sat 24 Sep, 1.30pm

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Thanks to our 2022 Open Eco Homes funders and supporters

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