Frameless Glass Extension to a Grade II Listed House in Warwickshire

Frameless Structural Glazing for Maximum Transparency

IQ Glass designed, manufactured and installed the complete glazing package, creating a virtually frameless extension that maximises transparency and natural daylight. A key feature of the design is an impressive 8-metre frameless strip rooflight that spans the length of the extension, flooding the interior with balanced natural light throughout the day. 

The structural glass rooflight consists of four silicone-bonded toughened glass panels, providing uninterrupted views of the sky and creating the minimalist appearance required for a heritage setting. 

Along the garden elevation, slim framed sliding glass doors with ultra-minimal 21mm sightlines provide floor-to-ceiling glazing and direct access to the outdoor terrace. The sliding door system was carefully aligned with the timber structure of the extension to create a clean and symmetrical architectural design.

Seamless Integration with Historic Stonework

One of the most important aspects of the project was ensuring the new glazing complemented the original building rather than competing with it. Bespoke fixing channels were discreetly incorporated into the existing stone walls, allowing the glass to meet the historic structure with almost no visible framing. 

This approach preserves clear views of the original masonry from both inside and outside the extension, enabling the historic fabric of the building to remain a key visual feature of the design. The original timber ceiling beam was also retained and exposed, helping to maintain a strong connection between old and new.

• Grade II listed 17th-century stone property in Warwickshire
• Contemporary frameless glass box extension
• 8-metre structural glass strip rooflight
• Ultra-slim sliding glass doors with 21mm sightlines
• Bespoke frameless connections to historic stonework
• High-performance double glazing with low-E coatings
• Flush thresholds for seamless indoor-outdoor living
• Conservation area compliant design solution

The Old Mullions project showcases how specialist architectural glazing can transform listed buildings while respecting their heritage significance. Through careful design, minimal glazing systems, and close collaboration between architect and glazing specialist, this Warwickshire home now benefits from a contemporary living space that complements its historic character and strengthens its connection to the surrounding landscape.