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Secondary Windows


Replacing old windows and doors can be challenging, especially in heritage-listed buildings where period features must be preserved. Permissions from the body corporate or council are often required to ensure new double glazed windows and double glazed doors match the existing ones. While these energy efficient windows and doors are rarely rejected, obtaining approval can be time-consuming and effort-intensive. For those looking for a simpler solution, installing secondary windows is an effective option.

Energy efficiency consultants and acoustic engineers frequently recommend our services for secondary glazing. This method provides excellent insulation against heat, cold, wind, water, and noise. Secondary double glazing offers the benefits of triple glazing with a wider air gap, ensuring maximum comfort and luxury.

Secondary glazing needs at least a 50mm gap from the existing windows to the wall or a windowsill with a minimum of 50mm wall space. If in doubt, you can send us photos or arrange a free consultation with our surveyor.

Installation Process: Our installers retain the existing windows when installing secondary double glazed windows and doors, avoiding the need for removal.

Tools Required:

  • Gloves, Goggles

  • Tape Measure, Spirit Level, Pencil

  • Electric Screwdriver, Hand Drill with 3, 3.5, or 4mm drill bits

  • Screws (various sizes)

  • Saw (to cut an aluminum angle)

  • Expanding Foam

  • Window Packers (1, 3, 7, 12mm)

Fitting Secondary Double Glazed Windows and Doors: The process involves leveling the window horizontally with packers and securing it with screws. Proper leveling is crucial to prevent tilting. Screws should be initially tightened lightly and fully secured after all screwing points are attached.

Sealing Secondary Double Glazed Windows and Doors: Sealing the new windows requires skill due to limited access. A corner nozzle for sealant ensures complete weather sealing. Clean the area thoroughly before applying expandable foam and silicon for optimal insulation and a neat finish. Use waterproof silicon outside and, if desired, paintable silicon inside.

Glazing of Secondary Double Glazed Windows and Doors: Glazing involves handling heavy double glazed units, necessitating safety precautions and additional tools like glass suction cups and rubber hammers. Proper positioning and centering of the glass within the frame are essential for a stylish and modern appearance.

Final Step: Fit handles and hinge covers where appropriate, and test the window to ensure smooth operation and airtight sealing. Any gaps or crookedness indicate improper installation, which should be adjusted for user comfort and preference.