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  • True Window & Glass Centre

What to Expect from uPVC Window Installation

If you’re considering upgrading your windows, uPVC window installation is an excellent choice, offering a range of benefits including energy efficiency, durability and aesthetic appeal. Unless you’ve had new windows installed before, you may be unsure of what’s actually involved, so the glazing services experts at True Window & Glass Centre are here to tell you exactly what to expect from a window installation.

Expert Consultation and Assessment

Before diving into the installation process, our team at True Window & Glass Centre begins with a thorough consultation and assessment. Understanding your specific needs and preferences is crucial for a successful installation. During this phase, we’ll discuss design options, energy efficiency requirements, and any other preferences or concerns you may have. Our experts will also assess your existing windows to provide tailored recommendations.

The Preparation Stage

If you’re looking to just replace an old window, refrain from removing the frame before your scheduled appointment - after all, you don’t want to be left with a gaping hole where the window should be if any issues arise during the installation stage.


Prior to installation, our team will measure the new window against the current frame and confirm what size windows are required for your new uPVC window installation. Once this has been established, we will run a sharp blade along the edge of the old window to break the seal between the frame and the wall, before then removing as much glass as possible to reduce the weight of the frame. We’ll also remove any external silicone and brick corners in order to detach the frame from the wall.

The Installation Process

While it is possible to fit uPVC windows from the inside, doing it externally is often smoother and poses less risk of damage to surrounding walls. Opting for internal fitting is fine, but you should be aware that you will likely need to replaster the perimeter of the window frame.


Whether you’re fitting uPVC windows into a timber or uPVC frame, the process remains the same. The new window will be carefully positioned into the space that the old window left behind. There needs to be a 5mm expansion gap around the window, meaning the window needs to be centralised with packers inserted around the entire frame.


Once the frame is in the correct position, we’ll use a drill to create two fixing holes in each side of the frame. For the top and bottom corners, we’ll drill 150mm into the frame and for the side holes, we’ll drill 600mm into the frame. It’s important that we don’t over-tighten any of the fixings, as this can create a hole in the frame, so we’ll take extra care over this step to ensure proper installation.


After the frame is securely fixed to the wall, we’ll seal it using a silicone sealant to ensure that moisture can’t get through. Once the sealant dries and the frame is secure, we’ll remove excess packers using a chisel.


For glazed windows, glazing platforms are used around each aperture to centralise the glass. The glass is then positioned and a nylon mallet is employed to gently tap the beading into place, starting with the horizontal beads before moving onto the vertical ones. After cleaning the glass and confirming measurements, the window is sealed into place using a silicone sealant.


Ready to experience the benefits of uPVC window installation for yourself? Contact True Window & Glass Centre today for a consultation tailored to your needs. Our team of experts is ready to guide you through the process, ensuring a seamless transition to more energy-efficient, durable, and aesthetically pleasing windows.

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