Precise measurements are essential for proper PVC window installation. Errors can lead to drafts, misalignment, and extra costs. Here’s a step‑by‑step guide to measure your opening correctly.
What you’ll need:
tape measure (5–7 m);
level (laser or spirit);
notebook and pen;
camera (to document the opening’s features).
Step1. Preparation
Clear the area around the window. Remove curtains, furniture, and any obstructions.
Step 2. Measure the width
Take three readings: at the top, middle, and bottom of the opening.
Record the smallest value.
Subtract 2–6 cm for mounting gaps.
Step 3. Measure the height
Take measurements on the left, in the centre, and on the right.
Note the smallest value.
Deduct 2–3 cm at the bottom (for the sill plate) and 1–2 cm at the top (for expansion gaps).
Step 4. Check the geometry
Use the level to detect any vertical or horizontal deviations.
Pay attention to rebates (ledges): if present, add 2–3 cm on each side for the window fit.
Mark any irregularities or distortions — they affect final dimensions.
Step 5. Record the data
Carefully write down all values.
Label each measurement (width, height, notes).
Photograph the opening from different angles.
Key tips:
Measure inside the opening.
Consider the windowsill and drainage sill if they remain in place.
If in doubt, consult a professional: a 5–10 mm error can compromise installation.
Conclusion:
Accurate measurements save time and money. Take your time — double‑check every dimension.