Types of secondary glazing

Ideal for large windows and spaces with limited access
The most common secondary glazing style, horizontal sliders feature panels that slide from side to side. This type is perfect for wide windows or areas where vertical space is constrained. The sliding mechanism is smooth and efficient, providing easy access to the existing window and excellent insulation without the need for additional space for opening.

• Features: Space-efficient, smooth sliding operation, effective thermal and acoustic insulation.
• Best For: Large or wide windows, areas with limited vertical space.

Perfect for traditional and heritage properties
Incarnation secondary vertical sliders are designed from the ground up to fit over traditional sliding sash or modern ‘mock sash’ windows. As one of the most popular window styles found in listed buildings, they use tensioned balances to support the sashes, letting them slide up and down easily. This style is particularly suited for sash windows and properties where maintaining a traditional look is important.
There is also the option of upgrading to tilting vertical sliders, allowing for easy cleaning and maintenance of both the primary and secondary windows.

• Features: Traditional design, smooth vertical sliding, effective thermal and acoustic insulation.
• Best For: Heritage properties, sash windows, and traditional aesthetics.

Ideal for enhanced functionality with a modern touch

Tilting vertical sliders offer the same advantages as our standard option, with the added benefit of a 45-degree tilt-in function. This advanced feature allows the sashes to tilt inward for safe cleaning. Additionally, the sashes can be fully removed for even greater convenience.

• Features: Tilt-to-clean functionality, easy access, smooth sliding operation, effective thermal and acoustic insulation.
• Best For: Modern and versatile spaces, where easy access and style are key.

Ideal for frequent access and versatility

Hinged secondary glazing units operate like a door, swinging open to provide easy access to the original window. This type is ideal for areas where regular maintenance or ventilation is needed. Hinged units offer excellent insulation and can be customised to fit various window sizes, styles and can also be hung from either side. Hinged units typically open inwards, so it is important to consider any current factors like blinds or curtains.

• Features: Easy to open, versatile for access, effective insulation.
• Best For: Rooms requiring frequent access, such as kitchens or utility areas.

Ideal for occasional access and discreet installation

Lift-out secondary glazing panels are designed to be easily removed and replaced. This type is ideal for windows where access is infrequent but where a high level of insulation is still required. The lift-out design ensures that the secondary glazing is discreet when in place and easy to handle when removed.

• Features: Removable for cleaning, discreet, high insulation.
• Best For: Windows where access is not needed regularly but insulation is a priority such as bays, corner windows and tight spaces.

Ideal for permanent installation with no need for access

Fixed secondary glazing units are permanently installed and non-opening, making them ideal for windows that don’t require regular access. These offer excellent thermal and acoustic performance while preserving the original window’s design with no sightlines. Fixed units can also be combined with other window styles as part of a larger secondary window. offer excellent thermal and acoustic performance while preserving the original window’s design with no sightlines.

• Features: Permanent fixing with discreet sightlines, high insulation and acoustic performance.
• Best For: Properties where windows do not need to be opened or require a secondary window to enhance thermal or acoustic performance.