In an uncertain future of climate change and energy scarcities there is an increasing urgency for homes to be more sustainable, both in their building methods and running costs. Our building plans particularly focus on reducing fuel poverty by making it more affordable for households to warm their homes.


Eco-retrofit is the refurbishment of an existing building focusing on insulating the to significantly reduce space heating demand through improved built fabric thermal performance, whilst also reducing hot water, lighting and appliance energy demand and improving ventilation systems.


The aim of this is to significantly reduce household energy use whilst improving occupant comfort and indoor air quality as compared with the average existing UK house. This has a number of positive effects:

– reduced household fuel bills up to 80%, meaning residents are less vulnerable to fuel poverty

– better comfort and indoor air quality, improving the health and wellbeing of residents.

– reduced carbon dioxide emissions, lessening the contribution of each household towards climate change.


To minimise potentially damaging ‘rebound’ effects and to keep in line with required UK carbon emissions reductions targets of 80% or more in the residential sector requires that retrofit measures go beyond a standard loft top up, double-glazing and boiler replacement approach.


The T21 retrofits will seek to achieve an absolute space heating requirement of 40kWH/m2.a or less (as calculated in SAP – 60kWH/m2.a when calculated in PHPP). If this target can be exceeded within budget constraints, we will seek to do so. This will be achieved through a mix of measures to include: solid wall insulation, triple glazing and attention to thermal bridging and air-tightness. This will be deployed alongside efficient heating, lighting and ventilation ┬ásystems. This target is equivalent to a roughly 80%-90% reduction when compared with similar existing UK homes.


We will aim for an absolute carbon emissions target of 25kgCO2/m2.a, to include all appliance use but exclude any on-site renewable energy generation. Again equivalent to an approximately 70-80% reduction when compared with existing housing. If renewables such as PVs are included, the target will be improved to 17kgCO2/m2.a.


In addition to the building works, all members of the Terrace 21 project are committed to lifestyles that reduce carbon consumption wherever possible. For example, the majority of members travel by foot or by bike for all of their journeys within the city.

Terrace 21 Mutual Home Ownership Society Limited © 2021
Address: 54 St James Street, Liverpool L1 0AB
Legal: Our Financial Conduct Authority registration number is 4173.
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