Measuring for new UPVC windows involves precisely determining the size of the opening (aperture) from the outside to ensure a proper fit.
To accurately measure UPVC windows, always measure the aperture from the outside and in three separate locations for the width and height and record your measurements in millimetres (mm). Take the smallest of the three measurements and deduct 10mm for white frames and 15mm for any coloured frames.
Why Measure from the Outside?
Measuring from the outside is crucial as it reveals the true size of the opening, including any inconsistencies in the brickwork or rendering that the internal finish might hide. Walls and window openings are rarely perfectly square, which is why taking multiple measurements is essential.
Step-by-Step UPVC Window Measurement Guide
Follow these steps to get the correct measurements for ordering your new UPVC windows:
- Gather Your Tools: You will need a reliable tape measure (preferably a steel one) and a notepad and pen to record your measurements in millimetres (mm). An assistant can also be helpful.
- Measure from the Outside: Stand outside the building to measure the window opening (the brickwork aperture).
- Measure the Width: Measure the horizontal distance across the opening in three different places:
- Across the top
- Across the middle
- Across the bottom
Record all three measurements in millimetres (mm).
- Measure the Height: Measure the vertical distance from the bottom sill up to the top of the opening in three different places:
- Down the left side
- Down the middle
- Down the right side
Record all three measurements in millimetres (mm).
- Find the Smallest Measurements: For both width and height, take the smallest of the three measurements you recorded. These represent the narrowest points of your aperture.
- Apply Deductions: To allow for fitting tolerances and ensure the new window fits without needing to force it into the opening, you must deduct a small amount from the smallest measurements.
- If you are ordering a white frame, deduct 10mm from the smallest width and the smallest height measurement.
- If you are ordering a coloured frame, deduct 15mm from the smallest width and the smallest height measurement.
Measurement Deduction Summary
Here's a quick reference for the required deductions:
| Frame Colour | Deduction (Width) | Deduction (Height) |
|---|---|---|
| White | Subtract 10mm | Subtract 10mm |
| Coloured | Subtract 15mm | Subtract 15mm |
The final figures after applying the deduction are your ordering size for the new UPVC window.
Important Considerations
- Accuracy is Key: Measure carefully and double-check your figures. Errors can lead to incorrectly sized windows.
- Record Clearly: Note down which measurement is for which window and clearly mark the final ordering size.
- Building Structure: Be aware of the building's construction. These steps apply to standard brick or blockwork openings. Other structures might require a different approach.
Following these steps ensures you obtain the necessary dimensions to order replacement UPVC windows that will fit correctly into the existing opening.
