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“We’re wrapping our whole house in insulation”

Eleanor and Chris Retrofit in East Oxford

Eleanor and Chris wrapped their 1930s house in insulation to make it warmer, greener, and cheaper to run.

About the home

Eleanor and Chris live in a 1930s three-bed end-of-terrace in East Oxford with cavity walls and solar PV panels on the roof. The home is very typical of the area with features of an interwar semi-detached, such as bay windows and it is heated by a gas boiler.

1930s three-bed end-of-terrace in East Oxford. Contractors keep the door open on a hot summer day.

They usually keep the home at around 19C when the heating is on in the winter, and when they are working from home they wear pullovers and use hot water bottles to help keep warm.

They made the decision to focus their retrofit on the main living area – a combined kitchen, dining room and living room where triple glazing has been installed. The Cosy Homes Oxfordshire team tailored their advice to help improve the energy efficiency of the home in a way that would work for them.

“Sixteen years ago we weren’t really conscious of saving energy at all and I think we had our thermostat up at 21°C, or something like that, but we’ve reduced it partly because of climate change, partly because of fuel bills.”

Eleanor, Cosy Homes Oxfordshire Client


Eleanor and Chris are both concerned about the impact of climate change and felt a responsibility to reduce the carbon emissions from their home.

The couple had both recently retired and wanted to get started on the project now they had extra time and funds. With fuel bills on the rise, they invested in their property to make it cheaper to run in the future.

“We’re both very worried about climate change, but also because of hugely rising energy bills.”

They also took the choice to retrofit their home to show what can be done, and perhaps inspire others in the local community too.

While upgrading insulation and draught proofing, they both understood they would need to improve ventilation and create good airflow to avoid issues related to dampness.

More Background

Eight years before the retrofit project they had a thermal image taken of the house which revealed the bay windows leaked a huge amount of heat. There are around 200 other houses on the estate which have the same windows. From thermal images of these houses, it appears the connection between the bay window and the wall is where the heat is leaking out.

Also, front doors with single-glazed glass panels were leaking heat, whereas those houses with an extra external front door performed much better at keeping the heat in.

Bay windows on the estate were shown to be a source of leaking heat.

They had 10cm of loft insulation alongside cavity wall insulation put in 12 years ago, paid for by a government grant. Since that time, they discovered the job wasn’t done competently and some of the cavity wall insulation had slumped.

The home had double glazing in some areas, but it was beginning to fail with condensation appearing on the inside of windows, and some of the window frames were beginning to buckle.

They already had solar PV panels installed on the roof.

What measures were installed?

The retrofit measures included:

  • External wall insulation
  • Loft insulation and boarding, and insulated loft hatch
  • High-performance triple-glazed doors and windows
  • Demand controlled ventilation

The Whole House Plan also recommended the installation of an Air Source Heat Pump, which the couple was considering installing once the house had met a high standard of insulation.

External wall insulation was wrapped around the house to keep the heat in.
Project coordination

Cosy Homes Oxfordshire drafted a Whole House Plan to create a prioritisation of measures and project plan for making the home as energy efficient as possible.

An example of a Whole House Plan with estimated savings for Fuel Bills and Carbon emissions.

Taking on a retrofit project can be very technical, and the couple recognised the value of the expertise Cosy Homes could provide.

“If we’re going to spend money on a big measure such as loft insulation, we want to make sure it’s properly done.

Chris, Cosy Homes Oxfordshire Client

When they had the loft insulation put in, the Retrofit Coordinator provided a quality assessment which identified some snagging issues which were then rectified by the building contractor.

Eleanor and Chris appreciated that Cosy Homes take a whole-house approach.

Before and After External Wall Insulation Install
Gaining expert guidance

They wanted to have expert input and guidance from their Retrofit Coordinator to consider several different measures and how they would combine and interact to fully reduce their home’s carbon impact for the future.

We’ve been very pleased with Cosy Homes, actually because neither of us is technical, we’ve very much valued their advice.”

Eleanor, Cosy Homes Oxfordshire Client
Retrofit Coordinator was on hand to oversee the project
A quality assessment of the loft insulation
Estimated Savings

Savings are based on Whole House Plan estimates and following the recommended measures. The following savings are estimated for the home calculated in November 2022:

  • 27% saving on carbon emissions, from 3.07 tonnes to 2.23 tonnes
  • 26% saving on fuel bills, from £1,590 to £1,180 per year
  • A boost from EPC rating C to B

Want to get started?

If you’re interested in retrofitting your home, and you live in Oxfordshire, get in touch with our expert team who will help you consider the options available.

Our Free Plan Builder can help Oxfordshire residents build an energy efficiency scheme for their homes. Simply enter your postcode, and you’ll see everything we know about the current energy efficiency and performance of your home, based on existing data. Then, choose your budget and priorities, and the Plan Builder will create a draft retrofit plan for your home – which you can edit to suit your needs.

Read more retrofit stories

Get your free draft retrofit plan

Curious about what home retrofit could do for your home’s energy bills and carbon emissions? Get started by using our Plan Builder to create a draft home retrofit plan, and then submit your plan to our team to start the Cosy Homes process.

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