Navigating building regulations Part L: How W20 TE simplifies commercial retrofits

• 3 June 2025
• News

For commercial property owners and designers, staying ahead of evolving building regulations is as much about embracing progress as it is about fulfilling requirements – offering a unique moment to champion energy efficiency and sustainability in every project.

For those seeking Part L compliance, Crittall Windows offers a solution that marries high quality with advanced performance, all within a robust steel system that architects and developers trust.

Why is part L compliance so crucial for commercial retrofits?

Part L of the Building Regulations sets the standard for energy efficiency in both new and existing buildings, ensuring that every retrofit or renovation project delivers measurable improvements in insulation and energy rating.

For commercial property owners, this means navigating complex requirements around U-values, thermal bridging, and air tightness. The right steel window and door system can make all the difference – simplifying compliance while delivering durable, high-performance results.

How does W20 TE help achieve part L compliance without major structural changes?

The answer is straightforward: W20 TE steel windows and doors are engineered with thermally enhanced adaption and high-performance glazing, achieving the stringent energy efficiency standards demanded by Part L.

Their robust steel frames are cleverly modified to create a thermal barrier, reducing heat loss and minimising air leaks. This allows commercial property owners to upgrade windows and doors without significant alterations to existing structures, maintaining the building’s integrity while improving its energy rating and functionality. The slim sightlines and large glazing options also maximise natural light, supporting occupant wellbeing and reducing reliance on artificial lighting.

The elegance and versatility of W20 TE in commercial settings

Crittall Windows’ W20 TE system stands out for its combination of classic aesthetics and modern performance. Available in a range of colours and textured finishes, W20 TE steel windows and doors adapt seamlessly to both heritage and contemporary commercial buildings. Their durability and resistance to corrosion make them a reliable choice for internal doors and external applications alike.

The system’s compatibility with advanced glazing solutions ensures outstanding thermal performance, supporting compliance with Part L and contributing to a healthier, more sustainable built environment.

A question of confidence: Can W20 TE deliver both compliance and style?

W20 TE steel windows and doors not only meet the rigorous standards of Part L but also offer a timeless, elegant appearance that complements any commercial or residential building. Their advanced performance and robust construction mean they are built to last, providing peace of mind for homeowners, architects, and developers.

With Crittall’s reputation for high quality and innovation, W20 TE is the preferred choice for those who demand both compliance and design excellence.

Sustainability at the heart of W20 TE design

Sustainability is woven into every aspect of the W20 TE system. Manufactured from recycled steel and designed for longevity, these windows and doors support the circular economy and help reduce the environmental impact of commercial retrofits.

Their minimal maintenance requirements and exceptional durability ensure they remain a sound investment for years to come. For environmentally conscious property owners, W20 TE offers not just compliance but a clear commitment to responsible design and construction.

Navigating compliance with Crittall’s expertise

Crittall Windows’ heritage and expertise in steel window and door manufacturing provide assurance that every project will meet the latest building regulations. The W20 TE system is backed by rigorous testing, ensuring it delivers consistent performance across a wide range of commercial and residential applications.

Whether upgrading a listed building or specifying windows for a new development, Crittall’s advanced steel systems offer the flexibility and reliability needed to navigate Part L with confidence.

Discover the W20 TE difference

For commercial property owners, architects, and developers seeking Part L compliance, Crittall Windows is the partner of choice. Explore the full range of W20 TE steel windows and steel doors and discover how their advanced performance, elegant design, and commitment to sustainability can transform your next project.

Contact Crittall today and take the first step towards a more efficient, beautiful, and compliant building.