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Our bay and bow windows feature a solid microcellular PVC construction that offers the window extra strength and insulation. This technology allows manufacturing windows that are more energy-efficient, brighter, and stronger.

Discover the technology

A RevoCell window cutaway with microcellular PVC zoom in showing the strength of the window.

More Efficient.

We build our windows for maximum indoor comfort, year-round. Our RevoCell bay and bow windows lead national charts with the highest Energy Rating (ER) with both double and triple-pane glass – in standard configuration!

40 Double Pane
48 Triple Pane

Energy Rating (ER)

A RevoCell bay window with the Energy Star Most Efficient 2024 logo.


Our window frames, sashes, mullions, and brickmoulds are solid inside, which makes then stronger than the typical hollow chambers used in PVC replacement windows. All of our windows come standard with a 4½” deep frame, 38% more than the industry standard of 3¼”. This makes them more rigid and help seal the wall opening better.

With casement profiles, our bay and bow windows achieve a whopping Performance Grade of 85, levels above the nearest competitors.

85 NAFS Performance Grade
A comparison of RevoCell's Solid-core microcellular PVC engineering versus the hollow chambers of the competition.


The extra strength of microcellular PVC allows manufacturing our bay and bow windows with slimmer frames and sashes. This adds an extra 1½” of glass in each dimension compared to ordinary PVC windows. Our internal mullions are only 4½” wide, as opposed to the usual 6-7”. And our glass is clearer. As a result, you get more glass, and more natural light inside your home.

Isn’t that what you put windows in your wall for?

25% Brighter
A RevoCell bay window showcasing it's thinner mullions and more glass surface area, making them brighter.

RevoCell® Bay / Bow Window Features

Bay and Bow windows protrude outside, expanding the indoor space and allowing for a panoramic view outside. This feature is particularly useful on townhouses or other buildings with reduced fenestration. With sunlight entering the room from 180 degrees, bow and bay windows are great at brightening the interior. With a highly decorative value on the facade, our bow and bay windows add curb appeal. From standard configurations to complex custom arrangements, we’ll build your bow and bay windows to your exact requirements, to match any home style.

Bay Windows - Contemporary Design

Contemporary Design

Modern exterior with understated slim profiles and up to 20% larger glass surface.

Bay Windows - 4½” Solid-Core mPVC Frame

4½” Solid-Core mPVC Frame

The solid-core microcellular PVC frame is 4½”, deeper than the usual 3¼”, making a window that’s stronger and seals the rough opening better.

Bay Windows - Dual and Triple-pane Insulated Glass Units

Dual and Triple-pane Insulated Glass Units

Our bay windows are available with double-pane or triple-pane glass and filled with 98% environmentally-friendly Argon gas.

Bay Windows - Super-clear Glass

Super-clear Glass

Our super-clear low-iron glass allow more visible light through, while low-e coatings help reflect back heat.

Bay Windows - Top-Performance Warm-edge Spacer

Top-Performance Warm-edge Spacer

Our insulated glass units use a top-performance cellular warm-edge spacer to minimize direct heat transfer.

Bay Windows - Triple Weatherstripping

Triple Weatherstripping

We use triple continuous weatherstripping seals at the window frame and sash interface, for an airtight fit.

Bay Windows - Easy-To-Remove Screen

Easy-To-Remove Screen

Our “One-Click” screens are the easiest to operate in the industry, making removal and installation a breeze while withstanding decades of use.

Bay Windows - Seat Option

Seat Option

Bay and bow windows can have a seat in your choice of material. Plywood (left) can be painted, oak (right) can be stained, and formica (centre) provides a ready finish.

Bay Windows - Foam-Insulated Post

Foam-Insulated Post

The angled bay mullions are filled with polyurethane foam for superior insulation.

Put the Finishing Touch on Your Bay Window

Our Energy Star® High Efficiency rated bay windows come with three (3) different options for the interior seat of the window.

Bay Window Interior Seat Options

Bay / Bow Windows Formica Seat Option

Formica Seat Option

Bay / Bow Windows Oak Seat Option

Oak Seat Option

Bay / Bow Windows Plywood Seat Option

Plywood Seat Option

Energy Efficient Bay and Bow Windows

The manufacturing process of all Energy Star® certified bay / bow windows installed by Verdun Windows and Doors are audited by an independent accredited certification body and approved by Natural Resources Canada. Our windows and doors carry the Energy Star® label showing their rating.

All of our RevoCell® mPVC windows meet and exceed the latest Energy Star designation criteria in Canada.

Energy Star's Most Efficient 2024
A map showing the Energy Star Rating Zones.

Bay and Bow Window Ratings

Our Bay / Bow Windows are created using multiple styles of windows depending on the look and feel you wish to obtain. Refer to the Energy Star® Ratings of the style you desire.

Your choice of colour

Most homeowners get their replacement windows in stock white, which is a great all-around colour. But you don’t have to: we offer a comprehensive selection of durable factory finishes on RevoCell® windows, to suit any home style. And if these don’t work for you, custom paint is always an option.

RevoCell® Window Colours

Click Swatch to preview colour.

Iron Ore
Commercial Brown
Black on Black
A White RevoCell® Window Section.

Grilles Patterns and Styles

In the old days, large panes of glass could not be manufactured cost-efficiently, so windows were filled with many smaller pieces of glass held in the sash by bars called muntins. These divided lite looks have become a sought-after architectural element, especially on traditional home styles. Take advantage of our window customization expertise to elevate the look of your new windows.

Internal grilles

Internal grilles are installed between the panes of glass, inside the the insulated glass unit. This allows for the easiest window cleaning. Our internal grilles are available in a variety of profiles, sizes, and finishes.

SDL grilles

Simulated Divided Lites (SDL) are external grilles. They are applied on the exterior of the insulated glass unit and give a more realistic muntin appearance. Like internal grilles, our SDL’s are available in multiple profiles and finishes.

Grille Patterns

Black Rectangular Grille Option


This classic divided-lite look offers a traditional Old-World aesthetic. Works equally well on traditional and newer homes, adding a timeless elegance.

Partial Covering Grille Option

Partial Covering

Our grilles can be aplied to a portion of the window only. Combined with an SDL profile, you can also reproduce a hung sash appearance on a casement window.

Contour Grille Option


Contour grilles go around the perimeter of the sash. Often associated with the Prairie School style, they add a artsy touch that’s distinctively North American.

Diamond Patterned Grille Option

Diamond Patterned

The diamond pattern can add an artistic touch to a traditional home. The understated charm of thin grilles adds extra interest from up close.

Divided Lites Grille Option

Divided Lites

Our grilles can be aplied to a portion of the window only. Combined with an SDL profile, you can also reproduce a hung sash appearance on a casement window.

Speciality Glass

We also offer some alternatives to clear glass in your windows. Tinted glass can be used to lower light levels, or to alter the colour balance indoors. Textured glass adds a degree of privacy as well as decorative interest, while letting natural light inside.

Bronze Glass Finish

Bronze Glass

Grey Glass Finish

Grey Glass

Frosted Glass Finish

Frosted Glass

Gluechip Glass Finish

Gluechip Glass

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