Thermal Performance of Windows and Doors - A Brief Guide
Approved Document L of the Building Regulations (commonly called Part L) sets out the legal requirements for the conservation of fuel and power in buildings in England and Wales. In Scotland, it is covered by section 6 of the building standards technical handbook. The purpose is to reduce carbon emissions by improving the energy efficiency of buildings.
Thermal Performance Matters
A Mandatory Requirement
New buildings, extensions & many refurbishment projects must comply with building regulations, which govern energy efficiency standards.
Energy Efficiency Focus
Limits placed on heat loss (U-values), air permeability, and overall building performance to ensure energy efficiency and compliance.
Applies to Windows and Doors
Critical for achieving compliance, as poor performance leads to wasted energy and higher energy bills.
Demonstrating Compliance
U-Values – Products must meet the required maximum U-values (thermal transmittance).
Energy Ratings – Replacement windows and doors can also be certified through recognised rating schemes.
Approved Calculation Methods – Only certified methods and registered simulators may generate compliance values.
Certification – An independent Certification Body verifies results and provides approvals, giving your customers additional reassurance that the data is correct and up to date with current requirements.
The PLC-Scheme from ER Certification Ltd
To support manufacturers and installers, ER Certification Ltd. has introduced the PLC-Scheme:
- Covers Window & Door Energy Ratings and U-Values.
- Provides Unlimited Approvals under a single price.
- Designed to simplify compliance with Part L for fabricators, installers, and specifiers.
- Backed by independent certification and impartial auditing.
- Approved customer listings published on our website for full transparency.
Key Takeaway
Part L compliance is a legal requirement. The PLC-Scheme from ER Certification Ltd. makes it easier, faster, and more cost-effective to demonstrate that your products meet the standards — giving peace of mind to customers and building control.
⚡ Find out how the PLC-Scheme can help you meet Part L today — contact ER Certification Ltd. for details.
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