Hinged Unit
Our hinged secondary glazing units provide a discreet, high-performance solution for a wide range of window types. Designed to open inwards like a door, each single-panel unit is easy to operate using a choice of standard espag handles or flush inline handles, available in a variety of colours and finishes.
With slim 60–72mm sightlines and no transoms or mullions, these units offer an unobstructed view while maintaining the character of your existing windows. Multi-point locking provides additional security, and side or base-opening configurations are available to suit different requirements.
For larger or more robust installations, heavy-duty hinged units and tilt-and-turn options deliver the same clean, discreet appearance with enhanced durability. Ideal for both commercial and residential applications, our hinged units combine unobtrusive design with superior acoustic, thermal, and security performance.
Enhanced Performance
Enhanced acoustic and thermal performance – designed to reduce noise and improve energy efficiency for commercial and heritage projects.
Flexible Installation
Flexible installation for large areas – units can be coupled or stacked to cover long runs of windows or oversized glazing.
Timber Subframe Compatible
Compatible with bevelled timber subframes – ideal for bays, splayed reveals, and complex window openings.
Sizes
Note: all sizes are for guidance only, and depend on several factors (including glass and subframe). Units and styles outside of those listed are sometimes possible – please contact us for advice.
Hinged Unit – Hinged options will house up to 28mm Double Glazed Sealed Unit (not available on Slimline units).
Hinged Unit Range
| Style | Description | Max Width | Max Height | Max Weight |
|---|---|---|---|---|
| SLHU | Slimline Hinged Unit | 1,560mm | 3,060mm | 100KG |
| HDHU | Hinged Unit | 1,571mm | 3,071mm | 180KG |
| DHU | Double Hinged Unit | 3,076mm | 3,071mm | 180KG |
| HUTT | Hinged Unit Tilt & Turn | 1,171mm | 2,871mm | 170KG |
| SDHU | Slimline Double Hinged Unit | 3,060mm | 3,120mm | 180KG |
Installation Options
Slimline:
| Product Range | Glass Options | Max. Window Size (Including 16mm Timber) | Installation Options | |||||
|---|---|---|---|---|---|---|---|---|
| Width (mm) | Height (mm) | Area (m²) | Face Fix Through Timber | Reveal Fix Through Frame | Bevels | Specials | ||
| Classic | 4.0mm tough | 1560 | 2060 | 1.7 | TIM-25×16 | TIM-25×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 6.0mm tough | 1560 | 3060 | 4.8 | TIM-25×16 | TIM-25×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 6.4mm Laminate | 1560 | 3060 | 4.8 | TIM-25×16 | TIM-25×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 6.8mm Laminate | 1560 | 3060 | 4.8 | TIM-25×16 | TIM-25×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 8.8mm Laminate | 1560 | 3060 | 4.8 | TIM-25×16 | TIM-25×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 10.8mm Laminate | 1560 | 3060 | 3.9 | TIM-25×16 | TIM-25×16 | TIM-62×50 | TIM-90×90 |
Heavy Duty:
| Product Range | Glass Options | Installation Options | |||||
|---|---|---|---|---|---|---|---|
| Face Fix Through Timber | Reveal Fix Through Frame | Reveal Fix Through Timber | Deep Reveal Fix Through Timber | Bevels | Specials | ||
| Classic | 4.0mm tough | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 6.0mm tough | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 6.4mm Laminate | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 6.8mm Laminate | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 8.8mm Laminate | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 10.8mm Laminate | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 12.8mm Laminate | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 24mm DG | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Enhanced | 28mm DG | TIM-50×16 | TIM-50×16 | TIM-62×16 | TIM-70×16 | TIM-62×50 | TIM-90×90 |
| Product Range | Glass Options | Max. Window Size (Including 16mm Timber) HS2 | HS3 | HS4 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Width (mm) | Height (mm) | Area (m²) | Width (mm) | Height (mm) | Area (m²) | Width (mm) | Height (mm) | Area (m²) | ||
| Classic | 4.0mm tough | 2534 | 1968 | 3.0 | 3762 | 1968 | 4.5 | 4934 | 1968 | 6.0 |
| Enhanced | 6.0mm tough | 4934 | 2068 | 10.2 | 4934 | 2068 | 10.2 | 4934 | 2068 | 10.2 |
| Enhanced | 6.4mm Laminate | 4934 | 2068 | 10.0 | 4934 | 2068 | 10.2 | 4934 | 2068 | 10.2 |
| Enhanced | 6.8mm Laminate | 4934 | 2068 | 9.4 | 4934 | 2068 | 10.2 | 4934 | 2068 | 10.2 |
| Enhanced | 8.8mm Laminate | 4934 | 2768 | 7.3 | 4934 | 2768 | 10.9 | 4934 | 2768 | 13.7 |
| Enhanced | 10.8mm Laminate | 4934 | 2768 | 5.9 | 4934 | 2768 | 8.9 | 4934 | 2768 | 11.9 |
You can choose from a comprehensive palette of more than 200 powder-coated RAL colours to achieve a precise match with your Granada secondary glazing system. Suitable for new developments, heritage buildings, and complex commercial environments, our finishes are specified to meet the requirements of each project.
Other Secondary Glazing Options
Frequently Asked Questions
What is the benefit of the subframe?
Our glazing products are supplied with a hardwood subframe as standard (please note that insert panels are not supplied with a subframe). Both the timber subframe and aluminium window frame are pre-drilled and countersunk to simplify installation. The subframe adds rigidity to the unit, ensuring a smooth, secure fit.
Aluminium is an excellent conductor of heat, and the hardwood subframe acts as a thermal barrier, preventing cold bridging from the building fabric to the frame. This helps maintain the temperature of the aluminium and glass, reducing the risk of condensation.
Because all units are manufactured in-house, by our suppliers we can also tailor your secondary glazing to your specifications. Please let us know at the quotation stage if a subframe or pre-drilled units are not required.
What is the difference between face fix and reveal fix?
Secondary glazing can be installed using either reveal fixing or face fixing, with each method optimised for specific performance benefits.
Reveal Fix – For maximum acoustic performance, we recommend installing secondary glazing with acoustic glass and a 150–200mm air cavity (glass-to-glass). Positioned within the window reveal, this method can reduce noise levels by up to 80% (54 dB).
Face Fix – To enhance thermal performance, face-fixed installations are recommended. The secondary glazing is mounted to the internal face of the primary window, ideally with no more than an 80mm gap. When combined with Low E glass, this can reduce heat loss by up to 65%, improving comfort and energy efficiency.
What materials are used for the frames?
Our secondary glazing is available in a variety of styles to complement all window types. Our range includes horizontal and vertical sliding units for easy access and cleaning.
Hinged unit mechanisms can be fitted to the side, top, or bottom of a window, depending on your requirements, while fixed and lift-out units offer practical, flexible solutions for maintenance and ventilation.
Designed in-house, our secondary glazing products combine discreet appearance with high performance. Suitable for all window types, the range can be tailored to meet specific project needs and budgets, making it ideal for both commercial and residential applications.
Contact us now on 07584 699685 for more information.