Curved Curtain Poles

How to measure a curved bay.

Also could be known as a Bow Window or a Round Bay.

Curved bay window curtain pole 25mm
“Good evening Stephen
I thought I’d send you a photograph of the curtain pole you made for me, fitted. And I wanted to thank you for fabricating and delivering it.
Thank you”
Matthew Dale.

How to measure up for a curved bay window pole

We want to get it right…

Please read carefully: By default, these poles are for bay windows with smooth continuously curved walls of constant radius (i.e. a simple curve). If your bay  also has straight wall sections at the mouth of the bay please measure per “Curve with flat ends” , or as a “multi-angle bay” if appropriate, shown at the bottom of the page. These poles may require compound elememts of simple curves and straight sections combined to achieve the best fit.

 25mm diameter tube is used for curved poles. These are now only entirely ceiling fixed or ceiling fixed with wall fixings at the finials. Max curve length is 3.5 m.

Please could you also send a photo of your bay window 🙂

Schematic drawing of bay window and pole
Curved bays are often fairly shallow circle arcs

Along the face of the curved wall
Measure in millimetres along curve A,B,C =
Depth of the Bay
Measure in millimetres from B to D =
Across the front
Measure in millimetres from A to C =

Along the Return walls too?

showing left return wall
Left return wall


Showing right hand return wall
Right return wall

If you’d like the pole to continue around the return walls please also measure:

Measure in millimetres from 1 to A =
Measure in millimetres from 2 to C =


Drawing to show curved bay with falt side walls
Curve ending in flat side walls

Along the face of the curved wall
Measure in millimetres along curve A,B,C =
Depth of the curved part of Bay
Measure in millimetres from B to D =
Across the front of curve
Measure in millimetres from A to C =
Side Walls
Measure in millimetres from A to E =
Measure in millimetres from C to F =
(If the walls  are not parallel (i.e. splay out) also measure the diagonals A to F and  E to C as well as E to F)

Along the Return walls too?

Measure in millimetres from 1 to E =
Measure in millimetres from 2 to F =

Take the measurements along the walls where the pole is to fix and include the full length of each wall section (even though these are ceiling fix poles). We will work out the pole size to fit allowing for any required offset from these measurements.
•If necessary state the distance (offset) you’d like between the wall and the pole (the default is 50mm)
•If necessary state where you’d like the finial to end (the default is the mouth of the bay). The poles can have return bends too.
•Measure in millimetres as errors can accumulate
** Use a  metal tape measure, held taut for the straight lengths.
** Use a fabric or fibre-glass tape flat along the face of the curved wall.

For your sake and ours you must take the time to provide careful and accurate measurements. We won’t make bay poles unless we are confident they will fit!

You’ll need someone to give you a hand especially for the curve depth B to D length. Please be as accurate as possible here as a small error can make a big difference.

We can make a pole fit with remarkably little space for brackets but please let us know if there are any potential issues.

A note on French Bay Window Poles:

For French Bay Window Poles, the bracket plates are the “finials”. Once you’ve measured your bay window, let us know where you’d like the bracket plates located as these should not be on the bay corners.

showing a curved pole in angled bay
This example shows how to measure for a Five Bend bay.

For an angled bay with a curved pole, you should measure the diagonals and walls of the bay window. Please refer to the relevant measuring guide for other multi-angle bays e.g. Six Bend Bay

Notice how a curved pole of constant radius varies in distance from the wall, being greatest at the wall angles (vertices). That’s why it’s better to fix the pole to the ceiling to avoid varying wall fix bracket projections.

How much will it cost?

There’s a price calculator which will give you a good idea of the cost.

How to Order?

Here’s a link to the ordering page.

Hi Stephen I have finally put up the curtain pole. Just didn’t have the time but finally it’s up. 

Kenrick…  Aug 2022

Example of a curved pole fitted in an angled bay