How to Measure for a Wall-Fixed Bay Window Curtain Track
For curtains hanging within the bay to a deep window sill when ceiling fixing isn’t possible
If you can’t fix your curtain track to the ceiling — because of coving, a beam, or limited space — then a wall-fixed track is usually the next best option.
This guide shows you exactly where to measure from and what sizes we need. Don’t worry if your bay window isn’t exactly the same shape as the examples below — the measuring method is the same for most bays.
Is this the right guide for you?
This page is for you if:
- your curtain track will be wall-fixed on brackets
- your curtains will hang within the bay
- your curtains will finish at the top of a deep window sill
- you can’t fix directly to the ceiling
If you can ceiling fix, that’s usually the better option. In that case, take a look at our ceiling-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 the walls over your window where the brackets will be fitted.
This gives us the correct shape for your bay and makes the whole process much easier. Measuring above the windows will almost certainly need two people
If your bay has small side walls inside the bay, 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 internal returns.
The good news is that the measuring method is the same. You’re still working from the walls over the window and measuring each section so we can map the full shape.
One thing to be aware of
If there isn’t much wall space on the left and right sides of your bay, your curtains may sit slightly across the side windows when they’re pulled back.
That’s completely normal with this type of setup. Because the curtains are staying within the bay, there’s sometimes limited space for them to stack at each side.
It’s much better to be aware of that now so you know what to expect.
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 across the wall over the window
Measure each straight section from one corner to the next along the wall.
If your bay has more sections, you’ll simply have more measurements — that’s 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 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 track fits properly rather than just “roughly” matching the shape.
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 expected.
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 perfectly.
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 you prefer.
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.