About Granada Secondary Glazing

Granada has led the way in secondary glazing solutions for over 45 years. As the largest UK secondary glazing manufacturer, they have produced nearly a million frames, averaging 100 every day and 25,000 each year. Decades of experience have made them experts in their field, prompting many trade companies to partner with Granada. Granada’s Sheffield-based, state-of-the-art factory sets the benchmark in secondary glazing manufacturing. The latest technology and precision engineering ensure consistent, high-quality frames with every order, and the company takes pride in delivering reliability and accuracy.

Granada has collaborated on major projects with architects, contractors, project managers, and developers across the UK, including hotels, hospitals, religious buildings, educational facilities, and residential properties. A trusted partner for both listed and modern properties, Granada Secondary Glazing is supported by CHAS, Constructionline, and ISO 9001 accreditation.

Listed Properties:

Granada Glazing Ltd’s seamless systems are trusted in heritage and Grade Listed buildings, where preserving original windows and façades is essential. Secondary glazing generally meets the requirements of the Planning (Listed Buildings and Conservation Areas) Act 1990, making it the perfect choice for those looking to increase energy efficiency and reduce noise in listed or heritage properties where they cannot alter or replace the existing windows.

Their work in this sector has established them as a key partner for architects and contractors involved in retrofit and restoration projects across the UK. Granada offers a fully managed solution from design to manufacture and installation; our installers are trained and accredited by us to above industry-standard levels. Our design experts provide CAD measurements for drawings as well as site visits from a dedicated account manager for support and advice.

Benefits:

Their discreet systems improve acoustic insulation, enhancing noise reduction by up to 80%. Secondary glazing can also improve the U-value of windows, reducing heat loss by up to 65% and contributing to an improved EPC rating by raising thermal performance, which in turn increases the property's energy efficiency.

Sustainability:

Sustainability drives Granada’s approach. By extending the lifespan and performance of existing windows, particularly in heritage and Grade-listed buildings, their secondary glazing reduces carbon emissions, lowers energy use, and delivers improved thermal and acoustic performance, supporting long-term environmental sustainability.

BS EN ISO 10140-2