Record the shape, not just a list of widths
A bay window brings several glass sections into the room at different angles. A corner window may have only two sections, but the meeting point can still make an ordinary straight-window order unsuitable. The important information is how the blinds relate to one another in space. A list of individual widths can miss the roll, bracket or bottom rail that projects into the neighbouring blind's path.
Sketch the opening from above as well as from the front. Mark each section with a room-based label, such as left return, centre and right return, using the view from inside. Add the walls, posts and sill. This does not need to be a construction drawing. Its purpose is to stop an order for several separate blinds losing the fact that they all meet within the same bay.
In an established Beaconsfield or central Pakenham home, decorative trim can be part of the decision. In another home, the main constraint may be a shallow recess or a corner without a substantial post. Avoid assuming the age or suburb tells you the shape. Show the actual opening, including trim you want to keep visible. The fitter needs to assess the junction and the fixing positions together.
Photograph the whole bay from the room and take a closer photograph of each junction. Open the windows as they are normally used and record which sections move. A photo from straight in front of the centre pane can hide a projecting handle on a side return. If an existing blind rubs or overlaps awkwardly, show that condition before taking it down so the replacement can address the cause.
Decide which blind leads through the corner
When two blinds meet at an angle, their hardware and fabric need an agreed relationship. One may continue closer to the corner while the other finishes short, or a different mounting arrangement may be needed. Ask the fitter to mark the proposed positions at the actual opening. The useful answer is a visible layout that explains the remaining gap and clearance, not a universal deduction applied to every corner.
Look at the roll or headrail first. It can project farther into the room than the lowered fabric, and its size may vary with the chosen product. A layout that works for a single roller may not work for a double roller bracket. If you change from one layer to two after the measure, ask whether the corner arrangement needs reassessment. Treat that as a design change rather than a simple fabric upgrade.
Next consider the bottom rails. With adjacent blinds at different heights, one rail can sit beside the other blind's fabric. Ask how the arrangement behaves while raising and lowering, not just when both are fully down. Demonstrating the full travel helps identify a junction that appears tidy in a still drawing but becomes awkward during normal independent operation.
Privacy and light control need their own assessment at the junction. A small space over a solid corner post may have a different effect from a space opening onto clear glass. Sit where you use the room and look towards the meeting point. For a bedroom bay, discuss the light path from the pillow. For a living-room bay, you may place more value on a clean view when the blinds are raised.
Do not assume a photograph of touching fabric proves the same treatment will work in your bay. The angle, frame, hardware and mounting depth can all differ. Ask for the selected product to be assessed against your actual junction. If a supplier proposes a particular corner accessory, request its compatibility and care details with the quote rather than treating it as an interchangeable finishing strip.
Choose the mounting plane deliberately
Blinds within each reveal can preserve the outline of the bay and leave decorative trim visible. Their suitability depends on the depth, fixing area and shape of each opening. Ask whether the headrails will sit at the same height and distance from the glass. A bay can look uneven if each blind is measured in isolation and the finished line has not been considered across the whole arrangement.
Face mounting can offer a different coverage pattern but brings the blinds farther into the room. At an angled return, that change affects where neighbouring units meet. Ask the fitter to demonstrate the front edge of the proposed hardware, not just the line of the glass. A wider fabric might improve one edge while creating an overlap or obstruction at the corner.
Check the sill and window seat beneath the blinds. A deep sill may hold plants or ornaments that obstruct the fabric path. An upholstered seat can meet the bottom rail before the blind reaches its intended position. Decide whether those items will move permanently or whether the blind should be specified around them. Clearing the seat only for installation does not solve a recurring obstruction.
Opening sashes need a separate check. Show the handle movement and how far the window normally opens. The proposed fabric line should be assessed with that movement, including access to locks. Do not assume the old blind's position was correct; it may have been kept raised precisely because it obstructed the window. Describe what you want to improve so that an existing inconvenience is not copied into the replacement.
If the bay also has a curtain track, decide whether it stays. Show the track, brackets and where the curtains gather. A new roller or venetian can change the space available for that layer. Coordinate the two systems before either supplier finalises an order. A bay with several separate trades involved benefits from a shared sketch showing the final positions, rather than separate measurements with incompatible assumptions.
Use separate sections for a reason
One advantage of a bay is that different panes face different directions. You may want to lower a side blind while keeping the centre view open. In a front sitting room, you may want to screen the footpath-facing return but keep a view to the garden. Explain those uses so the operating arrangement follows them. Matching fabric does not require every section to move at the same time.
Choose control positions from the normal room layout. A chain or wand placed at an internal corner may be difficult to reach behind a window seat. A cordless rail also needs to be reachable throughout its travel. Ask to demonstrate the reach without standing on furniture. If the bay is deep or access is restricted, discuss a different control arrangement before settling on a product solely for its appearance.
Motorisation may be useful for a genuinely inaccessible section, but decide whether each blind needs independent control or whether a group command suits the room. Ask how you will operate one return without moving the others. Include any charging access and the position of removable components in the discussion. The general motorised-blinds guide covers those system questions in more detail.
For venetians, consider the tilt as well as the lift. Slats in adjoining sections can present different views because of the bay angle. A setting that screens the centre pane may not screen a side return from somebody approaching along the path. Try the intended slat position from the room's normal seating area and explain any external sightline. The privacy guide helps organise that check.
A bedroom bay needs more than choosing an opaque material. Ask how light around the individual panes and between the blinds will be handled. Luxaflex's bedroom guide discusses layered window treatments; in a bay, any additional layer still needs to fit the angled geometry. A proposed curtain or channel should be assessed at the junction, not assumed to remove every light path.
Make the complete arrangement reviewable before manufacture
Ask for a labelled drawing or clear written schedule that links each blind to the sketch. It should identify the mount, fabric, control side, intended leading section and any different treatment at a return. Confirm which dimensions are opening measurements and which are manufacturing sizes. Avoid applying your own corner deductions and then allowing the supplier to apply another set without realising what has happened.
Review the appearance when fully open, partly lowered and fully closed. A continuous top line may matter in a formal bay, while independent light control may matter more in a study. State which is the priority if there is a compromise. It is easier to make that choice before manufacture than after discovering that equal-looking units cannot all occupy the same corner space.
At handover, operate every blind separately while the neighbouring blinds are at different heights. Open the windows and reach the controls from the normal furniture positions. Check that the specified labels and fabric selections match each opening. If you notice rubbing or an unexpected gap, compare it against the agreed junction layout rather than assuming it is an unavoidable feature of all bay windows.
Number the panes on your sketch and use the same numbers on the quotation and fabric selections. Similar widths are easy to confuse once several blinds arrive together. Record any deliberate differences, such as the return with a different control side or a centre blind using another mount. If more than one person is involved in approving the order, circulate that single labelled arrangement. This avoids a later colour or hardware substitution being approved for the wrong pane while everyone assumes they are discussing the centre window.
Ask how a future replacement would be identified without removing all the blinds. Keep the range, fabric code and opening label together. This is particularly helpful if one sun-exposed return ages differently or a single mechanism needs service while the other sections remain usable.
Questions about bay and corner blinds
Can I order each window as if it were separate?
Have the combined geometry checked first. Individual units can each fit their measured opening yet collide at the meeting point. The headrail or roll, fabric path, bottom rail and control access all need to work together across the junction.
Should the centre blind always sit in front of the returns?
There is no universal answer. The angle, posts, hardware and coverage priorities determine the arrangement. Ask the fitter to show the proposed relationship and its visible gap on your bay before the order is finalised.
Can I replace only one section?
Possibly, but identify the existing hardware and fabric first. A replacement can change the junction depth or appearance even if its nominal width matches. Ask whether the old fabric is still available and whether the new unit will operate beside the retained sections.
What if the bay is noticeably out of square?
Show the fitter the irregularity and ask how the chosen mount will present it. A straight blind cannot reshape the opening. The decision is about an appropriate fit and an acceptable appearance, with the expected gaps explained before manufacture.