---
title: Retrofit Evaluation | BuildingGT
description: Accurate U‑value measurement for retrofit decisions in existing buildings. Assess heat loss, insulation performance, and improve energy efficiency with real data.
---
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# Retrofit Evaluation Support with U-Value Measurements.
Understand why accurate U-value measurements in existing buildings matter. They support confident retrofit choices and improve building performance.
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## The Importance of U-Value Measurements in Retrofitting
Retrofitting projects are often challenged by incomplete data, reliance on assumptions, and limited understanding of the actual building performance. Each building behaves differently, and without real measurements, we can't easily see where energy is lost.
In situ U-value measurements enable accurate measurements of U-value under real operating conditions. By capturing real U-value measurement data for external walls and other building envelope elements, building professionals can assess the true thermal performance of a build before and after its retrofit.
U–Value measurements are vital for showing how much heat a building part loses. This helps link design plans with real-world results. Using an ISO 9869 U-value measurement system gives reliable thermal resistance measurements, and supports better retrofit decisions and energy savings.
Measured U-Value addresses key retrofit challenges of:
- Unclear problem spots or heat loss areas.
- Limited visibility of building envelope performance in existing buildings.
- Uncertainty in retrofit outcomes and energy performance improvements.
- Lack of reliable data for structured retrofit strategy development.
- Difficulty reaching sustainability targets or building regulations.
### Make Retrofit Evaluations with UVAL Wired and UVAL Wireless.
UVAL Wired and UVAL Wireless are complete U-Value measurement systems. They deliver accurate building envelope measurements on windows, walls, roof, floors and various façades.
Our UVAL Wired and UVAL Wireless solutions enable:
- Accurate in situ U-value measurements and real-time validation of retrofit solutions.
- Reliable baseline and post-retrofit comparisons using real U-value measurements.
- ISO 9869 U-value measurements using a non-invasive approach.
- Clear comparison of retrofit impact.
#### Explore relevant retrofitting publications featuring both of our UVAL systems.
[](https://www.sciencedirect.com/science/article/abs/pii/S0360544225037430)
Steven et al., (2025)
###### ["A new approach to retrofitting FHE campus buildings using a whole life carbon assessment."](https://www.sciencedirect.com/science/article/abs/pii/S0360544225037430)
[](https://onlinelibrary.wiley.com/doi/abs/10.1002/htj.70117)
Mansouri et al., (2025)
###### ["Noncontact Measurement of Thermal Resistance in 3D Concrete Printing Building Envelopes Using Infrared Sensing and Arduino."](https://onlinelibrary.wiley.com/doi/abs/10.1002/htj.70117)
[](https://www.mdpi.com/1996-1944/18/18/4330)
Marta Pomada and Janina Adamus (2025)
###### ["Analysis of Material Solutions for Internal Insulation of Masonry Walls—A Case Study."](https://www.mdpi.com/1996-1944/18/18/4330)
##### Discover our UVAL Systems:
Do you have questions on our UVAL systems? Explore our FAQs, or reach out to us via our contact page.
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UVAL Wired
###### [Precision U-value measurements, made simple.](https://info.greenteg.com/building/uval-wired?hsLang=en)
[](https://info.greenteg.com/building/uval-wireless?hsLang=en)
UVAL Wireless
###### [Flexible U-value insights, from anywhere.](https://info.greenteg.com/building/uval-wireless?hsLang=en)
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