--- title: "Case Study: EEH-Solutions' work on a Heritage Site" description: EEH-Solutions successfully completed a pioneering re-render and insulation project on a heritage site in Letchworth Garden City. image: https://www.eeh-s.com/hubfs/BLOG/EEH-S_CASE_STUDY_Work_on_a_heritage_site.jpg --- [Skip to the main content.](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#main-content) [![EEH-Solutions\_logo](https://www.eeh-s.com/hs-fs/hubfs/EEH-Solutions_logo.png?width=1931&height=1804&name=EEH-Solutions_logo.png "EEH-Solutions_logo")](https://www.eeh-s.com/) [![EEH-Solutions\_logo](https://www.eeh-s.com/hs-fs/hubfs/EEH-Solutions_logo.png?width=1931&height=1804&name=EEH-Solutions_logo.png "EEH-Solutions_logo")](https://www.eeh-s.com/) - [Home](https://www.eeh-s.com) - [About Us](https://www.eeh-s.com/about-us) - [Residential](https://www.eeh-s.com/residential) - [Partnerships](https://www.eeh-s.com/partnerships) - Services - [EWI & Rendering](https://www.eeh-s.com/ewi-and-render) - [Insulation Measures](https://www.eeh-s.com/installation-measures) - [ASHP](https://www.eeh-s.com/ashp) - [Renewables](https://www.eeh-s.com/renewables) - [Heating Upgrades](https://www.eeh-s.com/heating_upgrades) - [Ventilation](https://www.eeh-s.com/ventilation-system-upgrades) - [Retrofit Services](https://www.eeh-s.com/retrofit-installation-solutions) - Warm Homes - [Warm Homes Local Grant](https://www.eeh-s.com/warm-homes-local-grant) - [Boiler Upgrade Scheme](https://www.eeh-s.com/boiler-upgrade-scheme) - [Warm Homes: Social Housing Fund](https://www.eeh-s.com/warm-homes-social-housing-fund) - [News](https://www.eeh-s.com/news) - [FAQ](https://www.eeh-s.com/faq) - [Careers](https://www.eeh-s.com/careers-0) - [Contact](https://www.eeh-s.com/contact) Search Toggle Menu Search Toggle Menu - [Home](https://www.eeh-s.com) - [About Us](https://www.eeh-s.com/about-us) - [Residential](https://www.eeh-s.com/residential) - [Partnerships](https://www.eeh-s.com/partnerships) - Services - [EWI & Rendering](https://www.eeh-s.com/ewi-and-render) - [Insulation Measures](https://www.eeh-s.com/installation-measures) - [ASHP](https://www.eeh-s.com/ashp) - [Renewables](https://www.eeh-s.com/renewables) - [Heating Upgrades](https://www.eeh-s.com/heating_upgrades) - [Ventilation](https://www.eeh-s.com/ventilation-system-upgrades) - [Retrofit Services](https://www.eeh-s.com/retrofit-installation-solutions) - Warm Homes - [Warm Homes Local Grant](https://www.eeh-s.com/warm-homes-local-grant) - [Boiler Upgrade Scheme](https://www.eeh-s.com/boiler-upgrade-scheme) - [Warm Homes: Social Housing Fund](https://www.eeh-s.com/warm-homes-social-housing-fund) - [News](https://www.eeh-s.com/news) - [FAQ](https://www.eeh-s.com/faq) - [Careers](https://www.eeh-s.com/careers-0) - [Contact](https://www.eeh-s.com/contact) [Facebook](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#0) [Instagram](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#0) [Linkedin](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#0) [X](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#0) [YouTube](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#0) [Medium](https://www.eeh-s.com/news/case-study-eeh-solutions-work-on-a-heritage-site#0) 1 min read # Case Study: EEH-Solutions' work on a Heritage Site [![Picture of Emily](https://app.hubspot.com/settings/avatar/7a65d0c840a8b298e8ba7eab80c5cf9a) Emily](https://www.eeh-s.com/news/author/emily) : Published November 20, 2024 Updated January 8, 2025 ![Case Study: EEH-Solutions' work on a Heritage Site](https://www.eeh-s.com/hs-fs/hubfs/BLOG/EEH-S_CASE_STUDY_Work_on_a_heritage_site.jpg?width=1920&height=1080&name=EEH-S_CASE_STUDY_Work_on_a_heritage_site.jpg) The following case study details a re-rendering project that is the first of its kind, EEH-Solutions taking the challenge within Letchworth Garden City, a heritage site. The ensuing project was a re-render and External Wall Insulation (EWI). **WHAT IS THE SIGNIFICANCE OF THE CONSERVATION AREA?** EEH-Solutions have gained license to work on various dwellings directly from the Letchworth Garden City (LGC) Heritage Foundation, as any unapproved maintenance can lead to a complete removal of the home’s historical value. Any proposed changes by the homeowner and subsequent contractors must meet certain criteria according to the Letchworth Scheme of Management and Design Principles. This applies to all freehold premises within the Letchworth area, highlighting the restrictions on various home alterations (e.g. tree removal). Design Principles relate to the guidance of how an alteration should be conducted, split between the *Heritage Character Area* and *Modern Character Area*. **THE CHALLENGE** Undertaking the trial to insulate two homes within the heritage site, EEH-Solutions found that the previous concrete render was produced nearly one hundred years ago, sometime in 1920. Any new render applied must, therefore, replicate the original aesthetic. However, due to the age of the render, it was hacked away to find the original substrate used during the early 20th century. After uncovering the substrate of the first home, we discovered that there was a mixture of varying substrates, blockwork and calcium silicate brickwork, indicating that the house had been rebuilt. The original heritage was unknown. ![EEH-Solutions\_heritage\_site\_two\_by\_two](https://www.eeh-s.com/hs-fs/hubfs/Website/EEH-Solutions_heritage_site_two_by_two.png?width=620&height=331&name=EEH-Solutions_heritage_site_two_by_two.png) Overcoming this hurdle, EEH-Solutions carefully sourced a product that was suitable for this mix of substrate - the decision landing on a first-time-use cork and lime based render: Diathonite, with its own energy efficiency qualities such as thermal and moisture regulation.  This render was then applied to the front and alleyway of the building, while additional Webertherm XP system rockwool insulation boards were applied to the back - creating a hybrid. All of which provides additional insulation and structural integrity to the home – discreetly modernising the structure without erasing its original history. [If you would like to learn how EEH overcame these challenges, download our case study today.](https://share-eu1.hsforms.com/1ilVh6jZ6RDqTiqOkX43lOg2eexsh) [![EEH Partnerships with Schools](https://www.eeh-s.com/hubfs/schools_blog_thumbnail.jpg)](https://www.eeh-s.com/news/eeh-partnerships-with-schools) #### [EEH Partnerships with Schools](https://www.eeh-s.com/news/eeh-partnerships-with-schools) [Raja Naveed](https://www.eeh-s.com/news/author/raja-naveed) : Mar 25, 2025, 9:15:00 AM EEH-Solutions partners with East of England schools to offer students career pathways in retrofit, fostering skills and employment opportunities. [News](https://www.eeh-s.com/news/tag/news) [Read More](https://www.eeh-s.com/news/eeh-partnerships-with-schools) [![South East Consortium 2024: #CallForAction](https://www.eeh-s.com/hubfs/BLOG/EEH-S_%20Call_For_Action.jpg)](https://www.eeh-s.com/news/south-east-consortium-2024) #### [South East Consortium 2024: #CallForAction](https://www.eeh-s.com/news/south-east-consortium-2024) [Raja Naveed](https://www.eeh-s.com/news/author/raja-naveed) : Sep 30, 2024, 3:00:00 PM South East Consortium 2024, sustainable housing solutions, retrofitting strategies, and future-proofing green skills. Insights from industry leaders,... [News](https://www.eeh-s.com/news/tag/news) [Read More](https://www.eeh-s.com/news/south-east-consortium-2024) [![Cut Your Electricity Bill: Solar PV with EEH](https://www.eeh-s.com/hubfs/install.png)](https://www.eeh-s.com/news/cut-your-electricity-bill-with-solar-pv) #### [Cut Your Electricity Bill: Solar PV with EEH](https://www.eeh-s.com/news/cut-your-electricity-bill-with-solar-pv) [![Picture of Emily](https://app.hubspot.com/settings/avatar/7a65d0c840a8b298e8ba7eab80c5cf9a) Emily](https://www.eeh-s.com/news/author/emily) : Jul 16, 2026, 10:15:00 AM Discover how solar PV can reduce your electricity bills and provide potential income by selling surplus energy. Find out if your home qualifies for... [News](https://www.eeh-s.com/news/tag/news) [Read More](https://www.eeh-s.com/news/cut-your-electricity-bill-with-solar-pv) Contact EEH Contact EEH   **Registered Address: Kao Hockham Building, Edinburgh Way, Harlow. 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