Frequently Asked Questions
What does POPT mean in retrofit wall insulation projects?
It quantifies the proportion of a property’s treatable external wall area that has been insulated as part of a retrofit project, expressed as a percentage. A higher POPT % reflects a more comprehensive treatment. POPT is a critical metric for demonstrating compliance with PAS 2035 and plays a key role in evidencing the scope and effectiveness of energy efficiency improvements.
How do you calculate treatable vs untreatable areas?
POPT Calculator does the heavy lifting for you.
You enter basic wall, window and door dimensions, and we automatically deduct untreatable areas — delivering an accurate POPT % instantly.
Why is POPT important for PAS 2035?
POPT isn’t just a number — it’s a compliance requirement.
A well-documented POPT score shows that your project meets PAS 2035 guidelines and energy
efficiency targets.
POPT Calculator ensures your documentation is accurate, consistent and audit-ready.
What happens if my POPT % is too low?
If your POPT score falls short, it could impact your project’s ability to achieve maximum project scores which could impact your funding.
By using POPT Calculator early in the design process, you can identify shortfalls, adjust plans and increase wall coverage — before it’s too late.
I’m a Compliance Officer. Can I check someone else’s survey?
Absolutely.
POPT Calculator generates clear, detailed, exportable reports. You can quickly review a surveyor’s inputs, assess wall-by-wall calculations and verify compliance — in minutes.
Does it work on mobile or tablet?
POPT Calculator is optimised for computer and laptop usage. It can be used on mobile phones but for the best experience, we recommend desktop settings.
Is there a free trial?
Yes — try it out, no strings attached.
You can test the full power of POPT Calculator with our free trial. No credit card required. Just log in, explore and see how fast compliance can be.
Can I change my subscription plan?
You can upgrade your plan anytime.
Downgrades are available at the end of your current annual term — just let us know and we’ll make sure your plan matches your needs.
Is POPT Calculator suitable for larger teams?
POPT Calculator is built for scalability. Whether you’re running a solo operation or managing dozens of projects across multiple teams, we support consistent, compliant delivery at every level.
What if I need support?
We’re here to help.
Our team understands the pressures of retrofit compliance. If you need hands-on help with using POPT Calculator, just reach out via the contact form or email support@poptcalculator.com — and we’ll respond promptly. For queries relating to determining POPT , we recommend you contact your Retrofit Coordinator or Funder.