How to Measure for a Ceiling-Fixed Bay Window Curtain Track
For curtains hanging within the bay down to the top of the window sill.
If you can fit your curtain track directly to the ceiling, this is usually the neatest and best way to do it.
This guide shows you exactly where to measure from and what sizes we need. Don’t worry if your bay window is not exactly the same shape as the examples below — the measuring method is the same for most bay windows.
Is this the right guide for you?
This page is for you if:
- your curtain track will be ceiling-fixed
- your curtains will hang within the bay
- your curtains will finish at the top of a deep window sill
- you can fix directly to the ceiling
If you can’t ceiling fix because of coving, a beam, or another obstruction, take a look at our wall-fixed measuring guide instead.
If your curtains will be floor-length rather than stopping at the sill, you’ll want the floor-length version of this guide.
Where to measure from
The most important thing to get right is this:
You measure at the sill level — not at the ceiling level.
All your measurements should be taken from the back of the window sill, where the sill meets the window frames.
This gives us the correct shape for your bay and helps us make the track to fit neatly and accurately. Because the track is fitted directly to the ceiling, it also allows the curtains to hang straight down and gives a cleaner overall finish.
IMAGE PLACEHOLDER: Ceiling level measuring line (correct) with sill level crossed out
If your bay has small side wall sections, you’ll measure those as part of the process too.
Different bay shapes, same measuring method
Every bay window is slightly different — some have three sections, some have five, and some include small side returns.
The good news is that the measuring method is still the same. You’re measuring the bay shape where the track will be fitted, then giving us the extra sizes we need to map the angles properly.
Why ceiling fixing is usually the best option
If your bay allows it, ceiling fixing is usually the neatest way to fit a bay window curtain track.
Because the track sits flush to the ceiling, while giving you more flexibility on the exact track position.
It also helps keep the track less noticeable, which many people prefer.
How to measure your bay window in 3 simple steps
Once you know where to measure from, the rest is straightforward.
Step 1: Measure each section where the track will fit
Measure each straight section along the ceiling from one bend point to the next.
If your bay has more sections, you’ll simply have more measurements — that’s completely normal.
Step 2: Measure across the front of the bay
Measure across the opening of the bay — usually wall to wall, or from one outer corner to the opposite outer corner.
This helps us understand the overall width and spread of the bay.
Step 3: Measure the diagonals
The diagonal measurements allow us to work out the angles of your bay accurately.
These are what ensure your curtain track follows the shape of the bay properly rather than only being an approximate fit.
It’s simpler than it looks
Measuring a bay window can look a bit technical at first, but once you start, it’s usually much easier than people expect.
Just take your time, measure in centimetres, and write each size down as you go.
If your bay has more sections, we ask for more measurements simply so we can map everything out properly and make sure your track fits as it should.
Want to make it even easier?
You can use one of our printable measuring templates while you work.
They show exactly where to measure and give you a clear place to write each size down as you go.
Example: 5 sided bay measuring template
Once you’ve filled it in, just take a photo of the sheet.
When you come to order, you can either upload that photo or enter your sizes manually — whichever feels easiest.
Print it, fill it in, then upload a photo when you order
A few quick tips
- Use a steel tape measure if possible
- Measure in centimetres only
- Write each size down straight away
- Get help for wider bays if you can
- Double-check anything that doesn’t look right
Still unsure? Just ask
If you’re unsure about anything, just get in touch.
If it’s a quick question, feel free to call. If it’s a bit more involved, send a message and include a photo of your bay window — that always helps.
I’d always rather help you get it right now than have you second guessing later.