Fewer sections, sharper turns.
A bay window usually has a larger centre window with two angled side windows. Window manufacturers commonly offer 30-degree and 45-degree configurations, but the finished interior angle still has to be field-measured.
Custom window shutters - Toronto & GTA
Bay windowsBow windowsCustom vinyl shutters
Bay and bow window shutters, built around the angle.
A bay or bow is not one flat opening. Sunny Shutter measures every window section, corner angle, frame depth and panel clearance before planning a continuous custom shutter solution.
Why professional measurement matters: a nominal “30-degree” or “45-degree” bay description is not enough to manufacture the shutter frame. The actual interior geometry and obstructions must be checked on site.
Start with the architecture
Bay and bow windows create different fitting problems.
Both project beyond the wall, but the number of window sections and the direction change between them determine how shutters meet at every corner.
More sections, a gentler curve.
A bow window typically uses four or more similarly sized units connected by smaller repeated angles. More corners mean more opportunities for frame build-up, louver overlap or panel interference.
The practical issue: each window section normally needs its own shutter treatment. Without enough corner clearance, the frame, louvers, tilt mechanism or opening panel from one section can interfere with the next.
Angle planning, not angle guessing
We measure the window that is actually there.
A bay may be sold as a 30-degree or 45-degree window, but those labels describe the overall projection—not a production-ready shutter joint. We work from the finished opening, one junction at a time.
The goal is practical: keep neighbouring frames aligned while leaving enough room for louvers, tilt mechanisms and shutter panels to operate without colliding.
Establish the shutter line.
We identify where each shutter frame will actually sit. Trim, drywall returns, sill shape and frame depth can move that line away from the glass.
Check each corner independently.
Every included angle is recorded at the finished opening. Even a symmetrical-looking bow window can vary slightly from one junction to the next.
Plan the joint and panel movement.
The measured geometry is considered together with posts, mitred frame ends, louver projection, hinge position and the space needed to open each panel.
Professional site survey
An angle alone is never the full measurement.
A reliable bay or bow shutter plan combines geometry, depth, obstruction and operation data for every individual section.
01 / OPENINGSWidth and height.Each section is measured at multiple positions to identify taper, unequal units and out-of-square conditions.
02 / CORNERSIncluded angles.Every adjoining pair is checked. A bow window may not repeat the exact same angle at every corner.
03 / DEPTHRecess and frame depth.Available depth affects inside-mount options, louver projection, frame selection and handle clearance.
04 / OBSTRUCTIONSHandles, locks and trim.Casement handles, screens, mullions, casing returns and window cranks must remain usable.
05 / OPERATIONPanel swing paths.We check where each panel can open and whether adjacent shutter sections, furniture or the bay seat will block it.
06 / ALIGNMENTRails, posts and sightlines.Divider rails, T-posts and frame joins are planned to relate to the window structure and neighbouring panels.
Custom-mitred frames.
Frame ends can be cut to calculated angles so adjoining sections meet with a deliberate joint. This works only when the measured geometry, selected profile and installation surface support the detail.
Bay posts and corner posts.
A purpose-selected post can connect neighbouring shutter frames while managing the directional change. It can help individual shutter sections read as one continuous architectural treatment.
T-post planning.
T-posts establish where shutter panels hinge or meet within a larger framed section. Their position is coordinated with window mullions, panel width, operating access and the desired sightline.
Independent or unframed sections.
Separate frames, or an appropriate unframed layout, can reduce corner build-up when a continuous joint would restrict louver or panel movement. Small planned gaps may be necessary for reliable operation.
Sunny custom vinyl shutters
Light, privacy and structure without hiding the bay.
Custom shutters follow the individual window sections instead of flattening the projection behind one large treatment. Adjustable louvers allow each section to manage daylight and privacy while keeping the bay or bow architecture visible.
01
Made for the measured opening.Frame, post, panel and divider-rail decisions are based on the actual site survey.
02
Independent light control.Louvers can be adjusted by section to respond to changing sun, street exposure and room use.
03
Durable, wipe-clean finish.Vinyl shutters provide a practical low-maintenance surface for busy living and dining spaces.
04
Full-height or café-style planning.Coverage height, louver size and frame style are selected during consultation according to privacy and design goals.
From geometry to installation
A custom process for a multi-plane window.
Bay and bow shutters should be designed as an assembly, not ordered as unrelated rectangles.
Free consultation.
We review the room, privacy goals, preferred shutter style and how the windows need to operate.
Geometry survey.
Our team records every opening, angle, depth, obstruction, post line and panel swing condition.
Design and fabrication.
The frame, post and panel layout is translated into a custom production plan through Sunny's local team.
Professional installation.
Sections are fitted, aligned and checked for louver clearance, panel operation and a consistent finished line.
Bay and bow shutter examples
Different window rhythms, one considered finish.
Full-height shutters can follow sharper bays or gentler multi-section bows while keeping the room bright, balanced and architecturally clean.
Bay and bow window shutter FAQ
Answers about angles, frames and fit.
What is the difference between a bay window and a bow window?
A bay window usually has three sections with sharper direction changes, often a larger centre window and two angled sides. A bow window typically uses four or more similarly sized sections connected at smaller angles to create a gentler curve.
Why does the bay window angle matter when fitting shutters?
The angle determines how neighbouring shutter frames, posts, louvers and opening panels meet. If it is not planned with the frame depth and panel swing, one shutter section can interfere with the next.
Is there one standard production angle for every bay window shutter joint?
No. The measured corner is only part of the decision. The production detail also depends on the selected frame or post, mounting surface, joint symmetry and whether the opening is out of square. A simple two-piece mitre calculation should not be treated as a universal shutter cut.
Can I use the nominal 30-degree or 45-degree bay window angle to order shutters?
No. Those labels describe common window configurations but are not sufficient production measurements. The finished inside angle, opening dimensions, frame depth, trim, handles and panel clearances should be measured on site.
Does a bay window need one large shutter or separate shutters?
Each window section normally receives its own planned shutter module so the treatment follows the bay or bow shape. Frames, bay posts or T-posts can visually connect the modules as one composition.
What is the difference between a bay post and a T-post?
A bay or corner post helps connect shutter frame sections through a change in direction. A T-post divides a larger framed section and provides a planned location for panels to hinge or meet. The site geometry determines which is appropriate.
Will bay window shutter panels open fully?
That depends on the corner angle, panel width, frame build-up, sill depth, nearby furniture and neighbouring shutters. Sunny checks panel swing during the site survey and may recommend a different hinge, post, frame or panel layout to preserve practical access.
Are vinyl shutters suitable for bay and bow windows?
Yes, custom vinyl shutters can provide a durable, wipe-clean finish with adjustable light and privacy control. The frame and panel configuration must still be designed specifically for the multi-section opening.
Does Sunny Shutter measure and install bay window shutters in Toronto?
Sunny Shutter provides free in-home consultation, professional measurement and installation for custom bay and bow window shutters across Toronto, Scarborough and many GTA communities.
Have a bay angle that is hard to describe?
Book a free in-home consultation. We will measure the individual openings, included angles, frame depth and panel clearances before recommending the shutter layout.
