Collection: Developers

Thermal performance drives everything we do. 

Our windows and doors achieve market-leading U-values through intelligent engineering—combining the superior insulation properties of timber with the durability of aluminium cladding.

Every element contributes to efficiency: our argon-filled glazing units provide 60% better insulation than air-filled alternatives, while warm-edge spacer bars eliminate thermal bridging. Advanced sealing systems ensure minimal air leakage, creating windows and doors that significantly reduce energy consumption, help projects achieve incredible blower-door test results, and maintain perfect comfort year-round.

The result? U-values as low as 0.64 W/m2K while supporting your most ambitious architectural visions.

Timber-aluminium composite windows are the pinnacle of window engineering. 

While aluminium alone conducts heat over 1000 times more efficiently than timber (making it a poor insulator), our engineered timber frames provide exceptional thermal insulation. External aluminium cladding protects the timber from the elements while enabling deeper glazing units for enhanced performance, delivering the best of both materials without compromise.

This hybrid approach eliminates the thermal performance limitations of all-aluminium systems while overcoming the maintenance challenges of exposed timber. 

Each frame is precision-manufactured to your exact specifications, accommodating complex geometries and custom profiles while maintaining structural integrity and thermal performance.

Available in any RAL colour combination and custom finishes, our frames enhance both traditional and contemporary style buildings without compromising on performance.

Advanced glazing technology maximizes thermal performance while optimizing natural light and visual clarity. 

Our double and triple-glazed units feature low-emissivity coatings that allow beneficial solar gain while reflecting interior heat back into your spaces.

Triple glazing delivers superior performance for passive house standards and demanding climate conditions, while our high-performance double glazing offers excellent efficiency for most applications. Each configuration uses argon gas filling between panes, dramatically reducing heat transfer compared to standard air-filled units.

Warm-edge spacer bars eliminate the thermal bridging common in conventional glazing systems. Made from advanced low-conductivity materials, they maintain optimal glass separation while accommodating thermal expansion and preventing moisture infiltration.

Specialized glass options include acoustic glazing for noise reduction, security glazing for enhanced protection, and decorative options including integrated blinds and pattern glass.

Design freedom extends to every detail.

Our comprehensive customization capabilities include dual colour finish, custom shapes and designs for unique architectural features, and specialized hardware selections that complement your aesthetic vision.

Opening configurations adapt to any architectural requirement: inward and outward opening windows, sliding systems, bi-fold doors, and tilt & turn windows - all engineered to maintain our thermal performance standards. Custom glazing bars, decorative glass options, and integrated shading systems provide additional design flexibility.

Advanced features include automation-ready hardware for smart home integration. Our technical team collaborates with you to develop solutions for challenging architectural details, ensuring that performance and aesthetics work in perfect harmony across your entire project.

All Norrsken products conform to PAS 24:2016 enhanced security requirements.

Multi-point locking systems engage at multiple points around the frame perimeter, providing superior resistance against forced entry while maintaining smooth operation.

High-security glazing options include laminated glass that remains intact when broken, and toughened glass for areas requiring enhanced impact resistance. Advanced locking hardware meets the highest security standards while integrating seamlessly with our aesthetic design options.

Regular security testing ensures our systems meet evolving standards. During testing, products are put through loading tests – 200kg of pressure on windows and 500kg of pressure on doors. Once these tests are passed, the products are put through manual attack. 

Rigorous safety standards ensure that your specifications deliver both protection and performance throughout the building's lifecycle