Bay windows need a segment plan, not one width
A bay bends through space. Measure each straight section, decide whether curtains travel through the corners or live on separate sections, and only then choose rods, tracks and panels.
Write down each straight segment
| Segment | Measure | Also note |
|---|---|---|
| Left return | Length along the wall/track path | Corner, radiator, handle, furniture and stack space. |
| Centre section | Length along the centre face | Whether curtains need to meet in the middle and where supports can go. |
| Right return | Length along the wall/track path | Corner and usable stack space. |
| Drop | Planned hardware point to floor/sill | Check more than one point if floors/sills vary. |
Do not replace the bay with one straight chord
If you measure only from the far-left edge to the far-right edge through open air, you have not measured the path the curtain hardware follows around the bay. For a continuous system, the relevant length follows the actual rail/pole segments and corners. For separate systems, each segment is its own treatment.
Three hardware strategies
Separate straight rods
Each bay face gets its own rod and curtains. This avoids asking fabric to travel through corners, but creates separate opening/closing zones.
Corner-connected pole system
Uses compatible elbows/joints from a pole system. Confirm whether rings can pass the joint; many decorative connectors are not designed for continuous travel.
Bent or cornered track
Some track systems offer bends, custom curves or corner pieces that let gliders follow the bay. Bend radius and carrier travel are product-specific.
Ceiling-mounted track
Can simplify mounting when wall faces are narrow or irregular, but ceiling construction and fixing requirements still need product-specific verification.
Decide where the curtains park when open
A bay often has less flat wall beside the glass than a normal window. If all fabric stacks inside the bay, it can cover part of the side windows. If it stacks outside, you need wall/ceiling run beyond the bay and a system that can move there. Make this decision before choosing fullness, because more fabric also means a larger open stack.
Projection is easy to forget
Bay windows frequently contain handles, deep sills, radiators or furniture. Measure how far the hardware must project from the mounting surface so the curtain can pass without catching. Rod brackets and tracks achieve projection differently; use the exact product dimensions.
Panel planning: continuous vs separate
For separate rods, calculate each section individually instead of averaging widths. For a continuous track, use the full travel path as the coverage span, then decide how many drawing panels the heading/system expects. Ready-made panels may be awkward around corners because they were not designed for a custom bay geometry; made-to-measure workrooms can define finished widths differently.
Make a corner map before ordering anything
Sketch the bay from above and label every straight segment, corner and obstacle. The drawing does not need to be to scale; its job is to preserve the order of the measurements. Mark where the hardware starts and stops, where curtains are meant to stack, and whether a carrier or ring must cross each corner. That one sketch prevents a list of numbers from losing the geometry that gives those numbers meaning.
Common bay-window failure modes
Rings stop at the corner joint
The pole technically turns the corner, but the chosen rings cannot pass the connector. Decide whether that is acceptable before assuming one curtain can travel through the whole bay.
Stack covers side glass
There is no flat wall outside the bay, so all fabric parks in front of the side panes. Reduce the stack requirement, change the draw layout or use separate sections.
Track collides with handles
The plan followed the ceiling/wall line but ignored projection. Measure the deepest handle, sill or radiator that the moving curtain must clear.
One total width hides unequal sections
Combining every segment into a single number makes it impossible to decide where curtains meet or which section needs which panel quantity.
When separate sections are easier to buy ready-made
Ready-made panels are rectangular and usually sold by flat width and listed drop. Separate straight sections let you use those familiar dimensions without asking the heading or hardware to negotiate a corner. A continuous bay track can look cleaner and move differently, but it often benefits from a system designed specifically for bends and from curtains made to its finished-width method.
Do not average the drops either
Bay floors, sills and ceilings can vary across the projection. If one side of the bay is higher or lower, an average drop can make one panel drag while another floats. Measure the intended hanging point to the floor or sill at each section that will receive a separate curtain, especially before ordering custom lengths.
Bay-window checklist
- Every straight segment length along the intended hardware path.
- Corner type/angle and the exact compatible hardware solution.
- Whether carriers/rings must move through corners.
- Projection needed to clear handles, sills or radiators.
- Open-curtain stack location.
- Drop at more than one point.
- Separate-section vs continuous finished-width ordering method.
Use the room planner for separate bay sections
If each face uses its own straight curtain set, enter the sections as separate window types instead of forcing one average measurement.
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