Window Grid Styles Explained: Colonial, Prairie, Craftsman, and More

Most homeowners picking out replacement windows eventually reach a question they weren't expecting: "What grid style do you want?" And most people have to admit they don't know — they just know what they like when they see it.

Here's the thing: window grids have actual names, and those names come from architectural history. Colonial grids are named after Colonial-era American homes. Prairie grids come from the Prairie Style movement. Once you know what to call each one, it's much easier to communicate what you want and to figure out what suits your home.

Here's a plain-English guide to the most common window grid patterns and where each one belongs.

What Are Window Grids, Exactly?

Window grids — sometimes called grilles or muntins — are the strips that divide a window into smaller panes. In old single-pane windows, those dividers were structural: each piece of glass was small because large sheets were hard to produce. Modern windows don't need them functionally, but many homeowners want them for appearance, particularly on the front of the home where they contribute to curb appeal and architectural character.

The Main Grid Styles

Other Patterns You May Encounter

2-Over-2

Two panes in the top sash, two in the bottom. A simplified version of colonial grids — still traditional in feel but less busy. Works well on homes where you want some architectural detail without the full six-pane look.

Colonial 3-Over-1

Three panes in the upper sash, one clear pane on the bottom. This was a common configuration on traditional American homes — the upper sash has visual interest while the lower provides unobstructed outward sightlines. You'll still see this on older craftsman and colonial revival homes being faithfully restored.

Perimeter / Marginal

A thin border of smaller panes runs around the edge of the sash, leaving a clear center. Similar in spirit to prairie but more delicate. Often seen on Victorian and Queen Anne homes where windows are meant to be decorative features.

Custom / Geometric

Arched windows, radius tops, and specialty shapes sometimes use custom grid patterns — sunburst, fan, or other configurations — designed specifically for the opening. These are ordered custom and typically found on focal-point windows like entryways or stairwell landings.

Why "Colonial" Grids Are Called That

The 6-over-6 pattern — six panes in the upper sash and six in the lower — came directly from the constraints of Colonial-era glassmaking. In the 17th and 18th centuries, glass could only be produced in small sheets. To fill a window opening, glaziers had to use multiple small panes held together by thin wooden strips called muntins. Six panes per sash became a standard configuration for that era's proportions, and the look became so closely associated with Colonial American architecture that it kept the name long after glass technology made large single panes possible.

Today's "colonial grids" are purely decorative — there's one piece of glass behind them — but the pattern is so ingrained in American residential architecture that it remains the most popular grid style by a wide margin.

How Grids Are Actually Built Into the Window

There are a few different ways manufacturers construct window grids, and it's worth knowing the difference before you order:

Grids Between the Glass (GBG)

The grid strips are sandwiched inside the insulated glass unit — between the two panes of glass. From the outside they look like traditional muntins, but there's nothing on the surface to collect dust or require cleaning. This is the most popular option for replacement windows today.

Simulated Divided Lite (SDL)

Individual grid pieces are applied to the exterior and interior of the glass separately, with a spacer between the panes to create the illusion of true divided glass. Looks the most historically authentic from both inside and out. Costs more and requires occasional cleaning of the surface grids.

Applied Grids

Snap-in or glued grid strips applied to the surface of the glass. The most affordable option, but they can warp, discolor, or come loose over time in Florida's heat. Generally not what you want on a quality replacement window.

Choosing the Right Grid for Your Home

The best rule of thumb is to match the grid style to the architectural character of your home — or to the character you want it to have. A few quick guidelines:

• Traditional, colonial revival, or craftsman homes: Colonial 6-over-6 or 2-over-2 grids are the natural match. They reinforce the period character without looking forced.
• Craftsman bungalows: Prairie grids are a historically accurate and visually fitting choice. The geometry of the border pattern complements craftsman trim details.
• Florida ranch or mid-century homes: No grids or a simple 2-over-2 tends to look cleaner and more appropriate than a full colonial pattern.
• Contemporary or modern homes: Full view (no grids) is almost always the right call. Grids can look out of place on clean-lined architecture.
• Tudor or cottage-style homes: Diamond grids are the historically correct choice, though they're relatively rare in Central Florida.

When in doubt, look at what the rest of the neighborhood is doing — particularly homes of the same era as yours. Matching the neighborhood pattern usually looks more intentional than breaking from it.

And if you're replacing every window in the house, consistency matters. Mixing colonial grids on some windows and no grids on others tends to look patchy rather than planned. Pick one style and carry it through — or at minimum, be deliberate about where you do and don't want grids.