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Made to Measure. Made Simple.
The complete guide to
The complete guide to
measuring your window blinds
A perfect blind starts with a perfect measurement. Follow our step-by-step guides for Recess Fit, Exact Fit and Perfect Fit blinds — no guesswork, no returns, no fuss.
Before You Begin
Four measuring essentials
Measure in millimetres
Always measure in millimetres (mm) for the perfect fit.
Use a metal tape
A metal tape measure provides the most accurate results.
Measure every window
Even windows that look identical can vary by several millimetres.
Don't deduct
Enter the exact measurements you take. We'll make any necessary allowances.
Measuring Guide
Wooden Venetian Blinds
Choose between an inside-the-recess fit for a clean, built-in look, or an outside-the-recess fit for maximum coverage and light control.
Option 1
Recess Fit
Your blind sits neatly inside the window recess.
Step 1
Measure the Width
Measure the inside width of the recess in three places.
- 1 Top
- 2 Middle
- 3 Bottom
Use the smallest measurement.
Step 2
Measure the Drop
Measure the height in three places.
- 1 Left
- 2 Centre
- 3 Right
Use the smallest measurement.
Top Tip · Check your window handles don't stick out too far. If they do, you may prefer an Exact Fit blind.
Option 2
Exact Fit
Your blind hangs outside the window recess.
Step 1
Measure the Width
Measure the width you'd like your blind to cover.
- 1 +50mm each side (recommended)
Add ~50mm each side for better light control.
Step 2
Measure the Drop
Measure from where you'd like the blind to begin to where you'd like it to finish.
- 1 +70mm above the window
- 2 + as required below the sill
Allow enough drop below the sill for the look you want.
Handles
Ensure handles won't interfere with the blind.
Recess Depth
Check your recess is deep enough for your chosen slat size.
Obstructions
Look out for tiles, picture rails and other obstacles.
Recommended
Recess Depth
| Slat Size | Minimum Recommended Depth |
|---|---|
| 35mm | 50mm |
| 50mm | 65mm |
| 63mm | 80mm |
If your recess isn't deep enough, you can still choose an Exact Fit.
Extra Care
Bowed or Curved Windows
Some windows and recesses are not perfectly straight and may have a bow or curve. To ensure your blind fits correctly:
- Measure the width in at least three places and use the smallest.
- Measure the drop in three places and use the smallest.
- Never round measurements up or down.
Measuring Guide
Perfect Fit Blinds
No drilling. No screws. A perfect fit every time.
Perfect Fit
Designed for uPVC windows and doors.
Made to Measure
Made to your exact window sizes.
Easy to Install
Simple clip in / clip out system.
No Drilling
No screws needed. Protects frames.
Child Safe
Cordless design, sleek and safe.
How to Measure
It's important to provide us with the exact measurements of the visible glass only.
Step 1
Measure the Width
Measure the visible glass width in three places (top, middle, bottom).
- 1 Top
- 2 Middle
- 3 Bottom
Enter the smallest of the three.
Step 2
Measure the Height
Measure the visible glass height in three places (left, centre, right).
- 1 Left
- 2 Centre
- 3 Right
Enter the smallest of the three.
Step 3
Check the Depth
Check the depth of the glass and rubber beading to ensure a Perfect Fit.
15mm
minimum
A minimum depth of 15mm is required.
Top Tip · Measure in millimetres (mm) and use a metal tape measure for the most accurate result.
Top Tip · Do not include rubber seals, window beading or the window frame in your glass-only measurements.
Suitable for
- uPVC Windows
- Conservatories
- Patio Doors
- Tilt & Turn Windows
- French Doors
Not suitable for
- Wooden Windows
- Some Aluminium Windows
- Windows where handles or vents prevent the frame fitting correctly
- Square-bead windows (angled beads only)
Handy Tips
Obstructions
Make sure there are no obstructions (vents, handles or locks) that will interfere with the blind.
Vents
If your window has trickle vents, ensure there is enough clearance for the blind.
Angled Beads
Perfect Fit blinds are designed for angled beads only, not square beads.
Golden Rules
Six measuring tips
Measure twice.
Enter measurements exactly as taken.
Never round up or down.
Always use millimetres (mm).
Measure every window individually.
Contact us if you're unsure.
Need Help?
Still unsure how to measure?
Our friendly team is here to help. Contact us before ordering and we'll guide you through the process — window by window.