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Retrofit Validation & Post-Retrofit Monitoring
A retrofit is only as good as its results. ResiSure gives social housing providers, landlords and property managers measured evidence of how energy efficiency works are performing by monitoring temperature, humidity, mould risk and air quality before, during and after works.
That evidence helps you close the performance gap, catch condensation and mould early, support retrofit funding applications and keep a clear record for Awaab's Law.
What Is Retrofit Validation?
Retrofit validation is the process of measuring how a home actually performs after energy efficiency works, and comparing it with how it performed before. Instead of relying on modelled predictions such as an EPC, it uses real in-home data to confirm that measures have delivered the expected improvement.
Typical measures validated include:
- Loft, cavity, internal and external wall insulation
- Replacement windows and doors
- Heating upgrades, including heat pumps and new boilers
- Ventilation and airtightness improvements
The gap between predicted and measured performance is known as the retrofit performance gap. Validation shows whether that gap exists, how large it is, and which homes need attention.
Key features
Explore how ResiSure can assist with Retrofit Validation…
24m
An estimated 24 million homes across the UK require some form of retrofitting according to Net Zero Go
4m
Around 4.5 million energy-saving measures have been installed in properties across the UK via government support schemes (USwitch)
250bn
RICS estimates that decarbonising homes across the UK over the next 29 years will require an investment of approximately £250 billion in the housing sector
Why Is Retrofit Validation Important?
Predicted savings don't always show up in real homes. Validation turns assumptions into evidence you can act on.
Confirms Energy Efficiency: Insulation, glazing and heating upgrades are designed to cut heat loss. Measured data shows whether homes now hold heat better and stay at stable temperatures for less energy.
Closes the Performance Gap: Poor installation, thermal bridging or incorrect controls can stop a retrofit from delivering. Validation spots underperforming homes early, while contractors can still put things right.
Supports Compliance and Standards: Retrofit projects increasingly need to show outcomes against PAS 2035, funding conditions and housing standards. Continuous data gives you an objective record.
Strengthens Funding Bids: Funders want proof that money delivers results. Before-and-after data from completed schemes makes your next application more credible.
Reduces Tenant Complaints: When residents report cold rooms, high bills or condensation, you can check the data straight away and respond with facts, not guesswork.
At ResiSure, we give you the tools to track the metrics that matter, so you can prove your retrofit investment is working.
How Retrofit Validation Works
- Before works (baseline). Install sensors a few weeks ahead of works, ideally during the heating season, to record how the home currently holds heat and manages moisture.
- During works. Keep monitoring while measures go in. Temporary spikes in humidity from wet trades or open walls are normal, but prolonged problems are worth investigating.
- After works. Monitor for at least one full heating season. Comparing like-for-like weather conditions shows whether temperature stability, heat retention and humidity control have genuinely improved.
Retrofit Validation and Awaab's Law
Awaab's Law sets strict timeframes for social landlords to investigate and fix damp and mould hazards. Retrofit validation helps show that improved homes stay safe and healthy, with a continuous record of temperature, humidity, ventilation and mould risk.
When a resident reports a problem, that record helps housing providers investigate quickly, document findings and show what action was taken. It also demonstrates that retrofit works haven't created new hazards.
Supporting PAS 2035 Monitoring and Evaluation
PAS 2035 is the UK framework for whole-house retrofit of existing homes. It includes monitoring and evaluation requirements, with basic monitoring expected on every project and more detailed evaluation where the project calls for it.
ResiSure gives Retrofit Coordinators objective pre- and post-works readings, including early evidence of unintended consequences, to feed straight into that evaluation.
Can Retrofit Cause Damp and Mould?
Yes, if it isn't monitored. Making a home warmer and more airtight also traps more moisture from cooking, washing and breathing. Without enough ventilation, indoor humidity rises and condensation forms on colder surfaces, creating the conditions for mould growth.
Continuous humidity monitoring and mould risk alerts flag these problems within days, not months. That protects residents' health and your investment and gives you early warning before a disrepair claim.
Funding and reporting
Funders increasingly want proof that retrofit measures deliver real-world results. ResiSure data demonstrates improvements in temperature stability, humidity control and heat retention, giving you measurable evidence for reporting and future bids.
Warm Homes: Social Housing Fund
The Warm Homes: Social Housing Fund is the government's main retrofit funding route for social housing providers, succeeding the Social Housing Decarbonisation Fund (SHDF). Validated performance data from past schemes can strengthen applications and help evidence outcomes during delivery.
Other Funding Routes
Other national and local schemes may support retrofit under certain conditions. For the latest options, see our guide to how housing providers can access retrofit funding in 2026.
How Does ResiSure Help With Retrofit Validation?
ResiSure monitors your homes before, during and after works. Whether you've installed insulation, new windows or a heat pump, our sensors take readings every 30 minutes on temperature, humidity, mould risk, heat loss and air quality. You get clear evidence that retrofits are working, and early warning where they aren't.
Prove the Impact of Your Retrofit Programme
Talk to our team about validating your next scheme. We'll help you plan sensor placement, baselines and reporting so your data is ready for funders, boards and regulators.
Frequently Asked Questions
News & Insights
28 October 2026
In Summary John Healey delivered his first Budget as Chancellor one day after Awaab’s Law turned one, and a month before Phase 2 comes into force on 30 November. It eases household […]
20 October 2026
In summary… Damp and Mould Awareness Week puts a spotlight on the fact that over 7 million UK households are affected by damp and mould, and illness linked to cold and damp […]
9 October 2026
Private landlords in England are a step closer to legal deadlines for fixing damp, mould and other serious hazards. On 9 October 2026, the Ministry of Housing, Communities and Local Government (MHCLG) published its consultation on extending Awaab's Law to private rented tenancies. It runs until 11.59 pm on 18 December 2026.