How to measure for replacement windows
Measure wrong, pay twice. Five minutes with a tape measure gets it right first time.
Just 5mm too big and your new window is an expensive doorstop. Here is our method.
1. Grab three things
- Tape measure
- Pen and paper
- Your phone
Use millimetres only. Inches are how mistakes happen.
2. Measure the width three times
Top, middle and bottom. Windows are rarely square, so keep the smallest number.
| Top | 1198 mm |
| Middle | 1200 mm |
| Bottom (keep this one) | 1195 mm |
3. Measure the height three times
Left, middle and right. Same rule: keep the smallest number.
| Left | 1092 mm |
| Middle | 1095 mm |
| Right (keep this one) | 1090 mm |
4. Measure the frame, not the glass
The glass is not the window. Go frame edge to edge. For bay windows, measure from inside and make sure you measure the bay angles.
5. Take notes like a detective
- Which panels open
- Frame colour
- Glass type
Then photograph it, inside and out.
Not sure? Send us your measurements
Planning new windows or doors? Send us your ideas, a photo and approximate measurements to get started, and we’ll talk you through your options.
