Sash Window Certificates & Test Reports
U-Value & PAS 24 Sash Window Certificates
Sash window certificates provide independent proof that our products meet strict UK standards for both energy efficiency and security. At Sash Window Shop, we make these documents publicly available so you can be confident in the performance of your windows. All sash window certificates are issued by UKAS-accredited testing bodies and include both U-Value performance reports and PAS 24 security test results.
U-Value Certificate – Cords & Weights Sash Window
PAS 24 Security Test – Spiral Balance Sash Window
U-Value Certificate – Spiral Balance Sash Window
Drawing – PAS 24 Spiral Balance Sash Window
Why Sash Window U-Value Testing Matters
Alongside energy efficiency, security is a key factor in modern window design. PAS 24 is a recognised British standard that tests the ability of windows and doors to resist forced entry. Our sash window certificates for PAS 24:2022 demonstrate that the spiral balance sash window has passed the required manipulation, mechanical loading, and infill tests at UL International.
For traditional cords & weights sash windows, a PAS 24 specification is available, detailing the hardware and construction features required to achieve enhanced security. This gives homeowners, developers, and contractors the assurance that our products meet insurance and security expectations.
Why PAS 24 Certification is Important
When choosing new timber sash windows, U-Value performance is one of the most important measures. The U-Value shows how well a window retains heat – the lower the number, the better the thermal performance. Our sash window certificates confirm a U-Value of 1.2 W/m²K for both cords & weights and spiral balance sash windows.
This level of performance ensures compliance with Part L of the UK Building Regulations, meaning our windows contribute to reduced heat loss, improved comfort, and lower energy bills. The sash window certificates also confirm the test conditions and independent verification by ERC Testing Ltd
Who Issues Our Sash Window Certificates
All sash window certificates are issued by independent UKAS-accredited testing laboratories. ERC Testing Ltd has provided the U-Value performance results, while UL International (UK) Limited conducted the PAS 24:2022 security testing. Both organisations are recognised authorities, ensuring that our certifications are accurate, reliable, and trusted across the construction industry.
Benefits of Certified Sash Windows
Having sash window certificates available provides peace of mind to homeowners, architects, and developers:
Building Regulation Compliance – Certificates confirm that U-Values meet UK requirements.
Security Assurance – PAS 24 sash window certificates show products have been tested against forced entry.
Energy Efficiency – Lower U-Values mean reduced heat loss and lower running costs.
Project Documentation – Certification downloads provide evidence for planning, building control, and insurance.
Learn More About Our Sash Windows
Our sash window certificates are just one part of the assurance we provide. Explore our full range of sash windows to see design options, glazing choices, and technical resources. For conservation projects, you may also find our Conservation Areas Guide useful.
FAQ
Q: What U-Value have your sash windows achieved in testing?
A: Independent testing confirms a U-Value of 1.2 W/m²K for both cords & weights and spiral balance sash windows.
Q: Which sash windows are PAS 24 tested?
A: The spiral balance sash window is fully tested to PAS 24:2022 at UL International.
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