Delivering retrofit at scale, Retrofit technical considerations

Retrofit Testing with Letchworth Garden City Heritage Foundation

Introduction

Adam Armour-Florence is joined by Kris Karslake, Sustainability Policy and Programme Manager at Letchworth Garden City Heritage Foundation, to explore the challenges and opportunities of retrofitting historic and heritage homes. Drawing on lessons from the Retrofitting the First Garden City project, the conversation considers how communities can be brought along on the journey towards decarbonising older homes while respecting their character and heritage.

The episode highlights the importance of taking a long term, whole home approach to retrofit, considering planned improvements such as kitchens, bathrooms and extensions as opportunities to incorporate energy efficiency and low carbon measures. Kris also discusses practical actions available to homeowners and renters, from improving heating controls to introducing shading measures that can reduce overheating and reliance on air conditioning. The discussion emphasises that successful retrofit is not simply about installing new technology, but about understanding people, place and individual circumstances. Ultimately, the episode offers valuable lessons for creating a more sustainable future for historic communities while ensuring residents are part of the process.

For further information visit:

www.letchworth.com

www.letchworth.com/news/retrofitting-the-first-garden-city-a-feasibility-study

This podcast is an informal discussion between interested parties associated with Retrofit Information, Support and Expertise. Any views expressed are those of the individuals concerned and do not seek to represent the government.

Published: 2 September 2026

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