Custom Cut Mirrors: Polished vs. Beveled Edges

You are standing in a Toronto bathroom, staring at the wall where the old medicine cabinet used to be. The drywall behind it has seen better days. Maybe there is a patch, maybe the texture does not quite match, maybe the paint colour is off by a shade. You want a frameless custom mirror to cover it all up and open the room visually.

The glass shop asks: polished edge or beveled?

And you realize you have no idea what the difference is. That is fine. Most people do not, until they are standing in front of two samples and trying to guess which one will look right on their wall. This article will sort it out.

The Two Edge Types, Explained Without Jargon

Polished Edge

A polished edge mirror has its edges ground flat and then buffed to a smooth, glossy finish. The edge is perpendicular to the face of the mirror — a clean 90-degree angle. When you run your finger along it, it feels like the face of the glass itself: smooth, with no lip, no angle, no step.

A polished edge does not add any visual frame to the mirror. The mirror just... ends. Cleanly.

This is why designers reach for polished edges in contemporary bathrooms, wall-to-wall mirror installations, and commercial settings where mirrors need to look like part of the architecture rather than a hung object.

Beveled Edge

A beveled edge mirror has its perimeter ground at an angle — typically between 22 and 25 degrees — to create a sloped border that is usually between half an inch and two inches wide. That angled strip acts like a tiny prism. It catches light, refracts it, and throws off subtle rainbow effects depending on the light source and angle.

A beveled edge turns the mirror's border into a built-in decorative frame.

This is the edge you see on traditional vanity mirrors, formal dining room mirrors, and the kind of mirror your grandmother had above the fireplace mantel. It says "this is a mirror" in a way that a polished edge deliberately avoids saying.

Polished vs. Beveled: Side-by-Side

Property	Polished Edge	Beveled Edge
Edge angle	90° (flat, perpendicular)	22–25° angled slope
Visual effect	Clean termination, no frame	Decorative border, light refraction
Style read	Modern, minimal, architectural	Classic, ornate, traditional
Wall gap	Minimal — sits flush	Slightly visible — bevel angles outward
Hides wall imperfections	Better	Worse
Dust collection	Low — flat surface	Higher — groove at bevel junction
Cost (relative)	Base price	10–30% premium
Fabrication time	Standard	Longer — requires angled grinding
Best for	Wall-to-wall, frameless, contemporary	Standalone mirrors, vanity focal points

Which Edge Hides Wall Imperfections?

This is the question that actually drives the decision for most Toronto homeowners. Not style. Not cost. Whether the mirror edge is going to reveal or conceal the state of the wall behind it.

Polished edges win here, and it is not close.

A flat polished edge sits flush against the wall surface. The transition from wall to mirror is abrupt and tight. If there is a slight dip in the drywall, a texture mismatch, or an old anchor hole that was patched — the polished edge covers it by pressing right up against the surface. There is no gap, no angle, no shadow line to draw the eye.

A beveled edge, by contrast, angles away from the wall. That bevel creates a small but visible gap between the thinnest point of the glass (at the very edge) and the wall. Light gets into that gap. Shadows form. If the wall behind is not perfectly flat and uniformly painted, the bevel will announce it.

Quotable nugget: "A polished edge covers your wall's sins. A beveled edge puts them in a spotlight."

This matters most in renovation scenarios — and in Toronto, most mirror installations are renovations, not new builds. You are working with existing drywall that has seen decades of use. You might be covering the footprint of a removed medicine cabinet, a relocated light fixture, or just a section of wall that was patched and repainted by a previous owner who was not especially careful about texture-matching.

If the wall is perfect — freshly mudded, sanded, primed, and painted by a good drywall finisher — then the choice is purely aesthetic. Pick whichever edge you like. But if the wall has any history at all, a polished edge is the more forgiving option.

How Custom Mirror Edges Are Made

Understanding the fabrication process explains why beveled edges cost more and why the price difference is justified.

Polished Edge Fabrication

1. The mirror is cut to size on a cutting table using a glass scoring wheel.
2. The raw cut edge (called a "seamed" edge) is rough and sharp — it will cut you.
3. The edge is run through a series of grinding wheels, starting coarse and finishing fine, that smooth and polish the edge to a glossy finish.
4. The result is a flat, smooth, transparent edge with a slight greenish or bluish tint (that is the colour of the glass itself, visible from the side).

The whole process is straightforward. It can be done on a standard flat edging machine. Labour time is moderate.

Beveled Edge Fabrication

1. The mirror is cut to size, same as above.
2. Instead of flat grinding, the edge is fed through a beveling machine that grinds the glass at a precise angle — removing material to create the sloped border.
3. The bevel width is set by the machine. A half-inch bevel removes less glass. A two-inch bevel removes substantially more.
4. The beveled surface is then polished through multiple stages to achieve optical clarity on the angled face.
5. The result is a mirror with a prismatic border that refracts light.

Beveling removes glass. That means material waste. It also means the mirror blank needs to start slightly larger than the finished size to account for the material removed during beveling. The process takes longer, uses specialized equipment, and requires more skilled operators to maintain consistent bevel width and angle across all four sides of a mirror.

That is where the 10–30% price premium comes from. It is not markup — it is labour, equipment time, and material.

Cost Breakdown: What to Expect in Toronto

For custom-cut mirrors in the Greater Toronto Area, here is a realistic pricing range as of early 2026:

Mirror Type	Per Sq Ft (Glass Only)	Per Sq Ft (Installed)
1/4″ polished edge	$8–$14	$16–$24
1/4″ beveled edge (1″ bevel)	$12–$20	$22–$32
3/16″ polished edge	$6–$10	$14–$20

These numbers assume standard clear mirror glass, not antiqued, tinted, or low-iron. Installation costs include mirror mastic adhesive, any required clips or J-channel, wall prep, and labour. Complex shapes (arches, circles, custom cutouts for outlets) add to the price regardless of edge type.

For a typical Toronto bathroom vanity mirror — say 48 inches wide by 36 inches tall with a polished edge — expect to pay $150–$250 installed. The same mirror with a one-inch bevel runs $200–$340 installed.

The difference is real but not dramatic. If you prefer the beveled look, the premium is manageable. If you are covering a full wall — say, a 10-foot dining room feature wall floor to ceiling — the percentage difference on a larger surface adds up faster, and polished edge becomes the more budget-conscious choice.

When to Choose Polished

Polished edges make sense when:

• The mirror is frameless and flush-mounted. No frame to hide the edge transition, so the edge itself needs to be the finished detail. Polished edges do this cleanly.
• The installation is wall-to-wall or mirror-to-mirror. When multiple mirror panels butt up against each other, polished edges create tighter joints than beveled edges. Two beveled edges meeting create a V-shaped groove that collects dust and looks fussy.
• The design language is contemporary. If the bathroom has clean tile lines, floating vanities, and minimal hardware, a polished edge mirror matches the vocabulary.
• You need to hide wall imperfections. As covered above — polished wins.
• The mirror will be behind a backsplash, shelf, or other element. If part of the mirror edge will be concealed by another element, there is no point paying for a bevel you cannot see.

Quotable nugget: "Polished is the edge you choose when you want people to notice the room, not the mirror."

When to Choose Beveled

Beveled edges make sense when:

• The mirror is a standalone statement piece. A beveled edge gives a frameless mirror its own visual weight. Without a frame or a bevel, a standalone mirror on a wall can look like a placeholder.
• The room has traditional, transitional, or glam styling. Crown moulding, wainscoting, crystal fixtures — beveled mirrors belong in this world. They echo the same language of detailed trim and layered surfaces.
• You want light play. A beveled edge in a well-lit bathroom catches light from vanity fixtures and creates subtle prismatic effects. In a south-facing Toronto bathroom with morning sun, the bevel will throw small rainbows on the adjacent wall. That is a feature, not a flaw.
• The wall is already perfect. If you have fresh, flat drywall with a good paint job, the bevel will not expose any problems.
• The mirror is going above a mantel or in a formal space. Dining rooms, entryways, powder rooms — these are the traditional homes of the beveled mirror.

The Pencil Polish Option: A Middle Ground

Some fabricators offer a pencil polished edge — a slightly rounded edge profile that is neither flat nor beveled. Think of it as a polished edge with the sharp corners softened into a gentle curve.

Pencil polish works well for:

• Oval and round mirrors where a flat edge can feel too hard
• Bathroom mirrors in homes with young children (rounded edges are slightly safer)
• Situations where you want something more finished than polished but less decorative than beveled

It sits at roughly the same price point as a flat polished edge. It is worth asking your fabricator about if the straight-edged polished look feels too stark for your space.

Mirror Thickness: The Edge Choice Depends on It

Edge type and glass thickness are linked. Here is how:

• 1/8″ mirror: Too thin for beveling. The glass does not have enough depth to create a meaningful bevel. Polished or seamed edges only. Suitable for small decorative mirrors, closet doors, or temporary installations.
• 3/16″ mirror: Can take a narrow bevel (1/2″) but not a wide one. Polished is the more common choice at this thickness. Good for bathroom vanity mirrors under 36 inches.
• 1/4″ mirror: The standard for custom work. Thick enough for bevels up to 1.5 inches. This is the thickness most Toronto glass shops stock and recommend for residential installations. It is rigid enough to stay flat on the wall without flexing.
• 3/8″ mirror: Heavy-duty. Can take wide bevels (up to 2 inches). Used for large standalone mirrors, feature walls, and commercial lobbies. The weight requires more robust mounting hardware.

For most residential bathroom and bedroom mirrors in Toronto, 1/4-inch glass with either a polished or 1-inch beveled edge is the standard spec. Going thinner saves a few dollars but risks flexing. Going thicker is unnecessary unless the mirror is very large or takes heavy use.

Installation Considerations: How Edge Type Affects Mounting

The edge you choose affects how the mirror meets the wall and what hardware you need.

Polished Edge Installation

Polished edge mirrors are typically mounted with:

• Mirror mastic adhesive applied in vertical beads to the back of the glass. The mirror presses flat against the wall. The adhesive cures in 24–48 hours.
• J-channel or mirror clips at the bottom edge to support the weight while the mastic cures. Clips can be removed after curing or left in place.
• No frame required. The polished edge is the finished edge. Nothing else needed.

Because the edge is flat and the mirror sits flush, installation is straightforward. The mirror can go right into corners, against tile edges, or up to adjacent mirrors with minimal visible gaps.

Beveled Edge Installation

Beveled edge mirrors use the same mounting methods — mastic and clips — but with a few differences:

• The mirror sits slightly proud of the wall because the bevel creates a lip. This is usually only a millimetre or two, but it means the mirror is not perfectly flush.
• Edge-to-wall transitions are more visible. If you are installing the mirror in a niche or recess, the bevel adds a shadow line at the perimeter.
• Butting two beveled mirrors together creates a V-shaped seam that is more noticeable than two polished edges meeting. For multi-panel installations, polished edges produce cleaner joints.

If your installation involves residential window replacement work happening at the same time — and many Toronto bathroom renovations do combine mirror and window work — coordinate the scheduling so the mirror goes in after the window casing and trim are finished. Mirror mastic needs a stable, dust-free wall surface.

Maintenance and Longevity

Both edge types last equally long. Mirror failure comes from moisture attacking the silver coating on the back (called desilvering), not from edge degradation. That said, edge type does affect day-to-day maintenance:

Polished edges collect less dust and moisture along the perimeter. The flat edge does not create any channel or groove where water can pool. In a bathroom environment, this matters — less moisture at the edge means less risk of desilvering starting at the perimeter.

Beveled edges have a small groove where the bevel face meets the mirror face. In a steamy bathroom, water condenses along this groove, and over years, can accelerate edge desilvering. Wiping the bevel dry after showers extends the mirror's life.

Quotable nugget: "Every mirror dies from the edges in. The question is whether your edge type speeds up the process or slows it down."

For both types, make sure your installer uses mirror-specific mastic — not regular construction adhesive. Standard adhesives contain solvents that attack the silver coating on the back of mirror glass, causing black spots to appear within months. Mirror mastic is formulated to be chemically neutral to the silver layer.

Custom Shapes and Edge Options

Not every mirror is a rectangle. Toronto homes — especially older neighbourhoods like the Annex, Cabbagetown, Rosedale, and High Park — have arched niches, angled walls, bay window alcoves, and other geometries that call for custom-shaped mirrors.

Polished edges work on any shape. Curves, angles, irregular outlines — the flat grinding process follows whatever contour the glass has been cut to.

Beveled edges are more limited. Beveling machines run the glass along a straight path, which means beveling works well on straight sides but gets complicated on curves. A beveled arch mirror is possible but costs significantly more because the curved sections must be beveled by hand or on specialty equipment.

If you need a custom shape with curves, polished edge is the practical choice. If you insist on a bevel, expect to pay a premium for the curved sections — and make sure your fabricator has experience with curved beveling. Not all shops do.

Mirrors for Gyms and Commercial Spaces

If you are installing mirrors in a commercial setting — a gym, dance studio, yoga studio, or retail fitting room — edge type matters less than safety backing. Commercial mirrors need safety backing to hold glass fragments in place if the mirror breaks. The edge choice is secondary to the safety spec.

That said, most commercial mirror installations use seamed or polished edges, not beveled. The reasons are practical: commercial mirrors are typically installed panel-to-panel in long runs, and polished edges create tighter joints between panels. Beveled edges in a gym would create V-grooves along every seam — dust traps in an environment where hygiene matters and cleaning crews do not have time for edge-detailing.

The Toronto Context

Toronto is a renovation city. The housing stock ranges from Victorian-era homes in Cabbagetown to 1950s bungalows in Scarborough to 2020s condo towers along the waterfront. Mirror edge choice should respond to the architecture:

• Victorian and Edwardian homes: Beveled edges feel right. The existing trim, moulding, and millwork have the same language of shaped, detailed edges.
• Post-war bungalows and split-levels: Polished edges suit the simpler, more functional aesthetic. A beveled mirror in a 1960s bathroom can look like it is trying too hard.
• Modern condos: Polished, always. The clean lines of condo architecture — flush doors, minimal trim, slab cabinetry — demand an edge that disappears.
• Transitional renovations (older home, modern update): Either can work. If you are keeping the original trim and adding a frameless mirror, a bevel ties new to old. If you are gutting to the studs and going contemporary, polished keeps the language consistent.

Making the Call

Here is the honest summary:

Choose polished if the wall is imperfect, the design is modern, the installation is multi-panel, or the budget is tight. Polished is the workhorse edge — clean, practical, forgiving.

Choose beveled if the mirror is a standalone statement, the room has traditional character, the wall is perfect, and you want the mirror to announce itself. Beveled is the dress-up edge — decorative, classic, intentional.

Neither choice is wrong. Both edges are durable, both look professional when installed correctly, and both are available on custom-cut mirrors in any size a Toronto glass shop can handle.

The one you pick should match the room, not the trend.