How to Measure Bay Windows for Blinds
Bay windows require special attention when measuring. This guide walks you through measuring each section correctly for a perfect fit.
What You'll Need
Understanding Bay Window Configurations
Bay windows project outward from the wall, creating a cozy alcove. They typically consist of:
- 3-section: One center + two angled sides (most common)
- 5-section: One center + two sides + two corners
- Bow window: 4-6 curved sections (measure each)
Key Insight
Each window section is measured independently - treat each as its own window. You'll order separate blinds for each section.
Step-by-Step Measuring Guide
Choose Your Mount Type
Inside mount (recommended for bay windows): Blinds fit inside the window frame, preserving architectural detail.
Outside mount: Blinds mount on the wall/frame and cover the entire window.
Inside mount requires at least 1.5" depth in the window frame. Check each section.
Label Each Section
Before measuring, label your sections clearly. Standing inside looking out:
- • L = Far left section
- • LC = Left center (if 5-section)
- • C = Center section
- • RC = Right center (if 5-section)
- • R = Far right section
Measure Width (Each Section)
For inside mount: Measure the inside width at three points - top, middle, and bottom. Record the smallest measurement to ensure the blind fits.
For outside mount: Measure the width you want to cover, adding 2-3 inches on each side.
Measure Height (Each Section)
For inside mount: Measure height at three points - left, center, right. Record the longest measurement.
For outside mount: Measure from where you want the top of the blind to start to where you want it to end. Add 3-4 inches above and below window frame.
Check for Obstructions
Look for anything that might interfere with blinds:
- • Window cranks or handles
- • Locks or latches
- • AC units or vents
- • Molding or trim
Note these on your measurement sheet.
Double-Check Everything
Measure each section twice. Record width × height for each section. Confirm your mount type. Remember: measure twice, order once!
Sample Measurement Recording
| Section | Width | Height | Notes |
|---|---|---|---|
| Left (L) | 24 1/4" | 48" | Crank handle on right |
| Center (C) | 36 1/2" | 48" | Fixed window |
| Right (R) | 24 1/8" | 48 1/4" | Crank handle on left |
Mount type: Inside mount | Frame depth: 2.5"
Common Mistakes to Avoid
❌ Measuring all sections together
Each section needs its own measurement
❌ Using a cloth tape measure
Cloth stretches - use steel tape only
❌ Assuming sections are identical
Angles often make sections slightly different
❌ Forgetting window hardware
Cranks and handles affect blind operation
Frequently Asked Questions
Should I use one blind or multiple blinds for a bay window?
Multiple blinds (one per section) is recommended. Each fits properly within its angled section and provides better light control.
What's the best blind type for bay windows?
Cellular shades, roman shades, and roller shades work well. They mount easily in angled openings. Avoid vertical blinds.
How do I measure the angles in a bay window?
You don't need to measure angles. Each window section is a standard rectangle - measure each independently.
Ready to Order?
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