Accurate measurement of your old window opening is essential when installing double glazed windows and double glazed doors. Since UPVC double glazed windows are custom-built, an incorrect size cannot be returned. Therefore, for all replacement windows and doors, as well as some new constructions, our trained technicians take precise measurements before manufacture in Sydney. Most windows and doors are crafted to a +/-2 mm accuracy for the best possible fit.

We recommend that the installation and glazing of our energy efficient windows be carried out by qualified technicians such as window installers or glaziers. However, many DIY enthusiasts have shown interest in a supply-only option. While we provide double glazed windows and doors on this basis, we have observed that self-installation or work done by independent tradespeople can sometimes compromise the quality. For example, a significant gap between the wall and the window that isn't properly filled can reduce noise insulation and energy efficiency.

Please note, we cannot be held responsible for incorrect installations if we did not perform the work. We suggest contacting the party responsible for the installation. Although we are skilled at fixing poor installations, including those of our competitors, a fee will apply depending on the job's complexity and the number of items involved. We also offer consultation services for builders unfamiliar with UPVC double glazed windows.

To help avoid DIY disasters, we've created installation tips based on our experience correcting numerous problem installations. These tips are suggestions, not a step-by-step guide. Each installation may present unique challenges, such as weather or architectural issues, requiring expert knowledge. Therefore, while our information is accurate, it should not be solely relied upon.

Before beginning, verify the size, style, and position of your new double glazed window against your order. Even a perfectly installed window is ineffective if it is upside-down or intended for another room. Since UPVC windows are not loadbearing, a lintel may be needed above the window. If uncertain, consult a qualified fitter or surveyor. The new window should be about 10 mm smaller in height and width than the brick opening. Clear the area around the window by removing curtains, blinds, and ornaments.

To remove the existing window:

1. Cover the area with durable dustsheets inside and out.

2. Remove all opening sashes with a screwdriver or nail bar.

3. Carefully crack the glass in fixed lights with a screwdriver/punch and light hammer, starting at the top corner.

4. Remove cracked glass shards and dispose of them in a plastic bin.

5. Use a Stanley knife to break the plaster seal around the window frame.

6. Cut through the vertical (mullion) and horizontal (transom) frame members with a crosscut saw and remove.

7. Minimize damage to plaster, brickwork, and damp-proof membrane by carefully cutting through the outer frame jambs, head, and sill.

8. Use a nail bar to lever the framework away from the plaster line.

9. Clean away any debris around the opening with a masonry chisel.

To fit the new window:

1. Position the cill profile onto the brickwork, ensuring the upstand is snug against the plaster line of the jambs.

2. Level the cill using plastic packers, leaving approximately 5mm clearance between it and the brickwork.

3. Secure the cill with 8 x 100 mm fixing bolts, 150 mm from each end and at 600 mm centers.

4. Apply silicone along the back edge of the cill upstand.

5. Secure the end caps into position with silicone or superglue.

6. Remove all glazing beads from the window frame and mark them for replacement.

7. Position the new window with the base snug against the cill upstand, ensuring a tight silicone seal.

8. Wedge the window into position with plastic packers, checking for vertical alignment with a spirit level.

9. Secure the window to the cill with #8 x 40 posidrive screws and the window jambs to the brickwork with 8 x 100 mm fixing bolts, avoiding the head of the window to prevent damage.

10. Check for squareness within the outer frame.

Glazing notes:

1. Position 25 x 100 x 15 glazing bridges in the frame recess with a dab of silicone.

2. Place a 28 x 100 x 5 glazing packer on the bottom glazing bridges.

3. Position the glass sealed unit in the aperture, ensuring it is central.

4. Use hand pressure to position additional 2 mm glass packers for squareness.

5. Open and close the sashes to check for smooth operation and adjust packers as needed.

6. Clip back the glazing beads in the order of top, bottom, then sides.

7. Apply a silicone bead between the outside masonry and window frame, and an acrylic bead between the inside plaster and window.

8. Remove protective tape from the window frame and clean with warm soapy water.

Once the window is installed, check its operation. It should open and close smoothly and be airtight when closed. If the window looks crooked, it has not been correctly installed. Verify the sash fits into the frame without gaps and operates smoothly.