Published: January 2026

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A Retrofit Costs Comparison

Translating Expenditure to Value

We know that deep retrofit is a proven route to achieving net zero targets, tackling fuel poverty, and improving occupant health, but how much ill we need to spend on it – and what kind of retrofit can we afford? This research report, commissioned by the Passivhaus Trust and conducted by AtkinsRéalis, analyzes real-world social housing data to provide a transparent comparison of retrofit costs across different approaches to the challenge, including EnerPHit, Energiesprong, and AECB CarbonLite.

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