Roman Shades for Large Windows: What Actually Works for Wide, Oversized Windows?

Roman Shades for Large Windows: Quick Answer

Large windows are one of the best places to use Roman shades—and also one of the easiest places to make an expensive mistake.

The issue is not simply whether a Roman shade can physically cover a wide window.

As a Roman shade becomes wider or taller, it contains more fabric, lining, hardware, and weight. That affects how the shade lifts, how evenly the folds stack, how easy it is to operate, and how clean it looks when fully lowered.

For that reason, the best solution for a large window is not always the largest single Roman shade you can make.

This guide explains what actually works for wide and oversized windows, when one large Roman shade makes sense, when multiple shades are better, and how factors such as motorization, blackout lining, mounting style, and window construction should affect your decision.

For Morrahome Roman shades:

• A single corded Roman shade can be made from 18" to 78" wide and 20" to 90" high.
• A single cordless Roman shade can be made from 18" to 78" wide and 20" to 90" high.
• A no-drill Roman shade can be made from 24" to 62" wide and 20" to 90" high.
• A motorized Roman shade can be made from 22" to 78" wide and 20" to 110" high.

If your window is wider than 78 inches, that does not mean Roman shades are unsuitable.

It usually means the opening should be divided into two or more shades instead of being covered by one oversized shade.

The important question is therefore not:

“Can I make one Roman shade wide enough?”

It is:

“What Roman shade configuration will operate reliably and look balanced on this window?”

How Wide Can a Morrahome Roman Shade Be?

Morrahome's current maximum width for a single Roman shade is 78 inches for corded, cordless, and motorized systems.

The no-drill system has a smaller maximum width of 62 inches.

These are Morrahome manufacturing specifications, not universal size limits for every Roman shade on the market.

Different manufacturers may use different fabrics, headrails, motors, lift mechanisms, construction methods, and testing standards.

Morrahome's factory established these production ranges through internal testing to balance two things that matter on a finished Roman shade:

1. reliable, smooth operation;
2. a neat and consistent finished appearance.

Making a Roman shade larger is not necessarily difficult from a purely manufacturing perspective.

Making it larger while still maintaining predictable operation and appearance is the more important challenge.

That is why a responsible maximum size matters.

What If My Window Is Wider Than 78 Inches?

A window wider than 78 inches can still be an excellent candidate for Roman shades.

Instead of trying to manufacture one extra-wide shade, the opening can usually be divided into two or more independently operated Roman shades.

For example:

• A 100-inch-wide opening might use two shades of approximately 50 inches each.
• A 120-inch-wide opening might use two shades of approximately 60 inches each.
• A 144-inch-wide opening could potentially use two approximately 72-inch shades or three smaller shades.

But those numbers should only be treated as starting points.

When dividing a large window, do not simply divide the total width mathematically.

Look at the architecture first.

If the window has vertical mullions, separate glass panels, or clearly defined sections, the breaks between Roman shades should usually follow those lines whenever possible.

A 120-inch opening with three equal glass panels may therefore look better with three Roman shades than with two 60-inch shades.

The goal is not to use the fewest shades possible.

The goal is to make the entire installation look intentional while keeping each individual shade within a size range that allows it to function properly.

One Large Roman Shade vs. Two or Three Roman Shades

For wide windows, this is usually the most important design decision.

Neither approach is automatically better.

When One Roman Shade Is Better

A single Roman shade creates one uninterrupted surface of fabric across the window.

That can be especially attractive on:

• large picture windows;
• wide windows without strong vertical divisions;
• rooms using patterned fabrics;
• interiors where a clean, minimal appearance is the priority.

A single shade also avoids the small vertical gaps that naturally occur between separate shades.

If the finished dimensions fall comfortably within the product specifications, one shade can provide a very clean result.

When Multiple Roman Shades Are Better

Multiple shades become more practical as the total opening becomes wider.

The biggest advantage is that each shade contains less fabric and has its own operating system.

That can make the shades easier to manage and gives you much more control over light.

Imagine a wall of three windows.

At 4:00 p.m., direct sunlight may hit only the right side of the room.

With three individual Roman shades, you can lower the right shade without covering the entire window wall.

That is impossible with one oversized shade.

Multiple shades are particularly useful for:

• windows wider than 78";
• banks of two, three, or more windows;
• windows with visible mullions;
• rooms where sunlight varies across the opening;
• large windows where independent light control matters.

There is one trade-off.

Separate Roman shades normally create a small space between individual shades. If maximum room darkening is the priority, those gaps need to be considered.

A Simple Large-Window Decision Guide

For Morrahome Roman shades, this is a practical starting point:

This table should be used as a starting point rather than a substitute for measuring the actual window.

Recommended Morrahome Roman Shades for Large Windows

There is no single Roman shade that is best for every oversized window. The more useful approach is to match the product to the mounting conditions, desired light control, operating method, and dimensions of each individual window section.

For most Morrahome large-window projects, the following two products are the primary starting points.

If the main priority is maximum flexibility for a large or tall window, start by evaluating the standard-mounted Harper Roman shade. If avoiding drilling is the primary requirement and each window section falls within the no-drill size range, the no-drill Harper option may be the better fit.

Why Very Wide Roman Shades Become More Difficult

A Roman shade appears simple when it is hanging on the window.

Behind that simple appearance is a system that has to repeatedly raise and lower a large piece of fabric while keeping the folds controlled.

As the width increases, several things change.

More Fabric Means More Weight

A 72-inch-wide Roman shade contains considerably more fabric than a 36-inch-wide shade of the same height.

If blackout lining is added, the finished weight increases again.

The operating system has to lift that material every time the shade is opened.

Alignment Becomes More Visible

A small difference in fold alignment may be almost invisible on a narrow window.

Across a large shade, the same difference is easier to notice.

This is one reason manufacturers establish size specifications instead of simply offering unlimited width.

Fabric Construction Matters More

Decorative fabrics are produced in specific usable widths.

Depending on the finished width of the Roman shade and the fabric selected, very wide shades may require seams.

With solid or subtly textured fabrics, those seams may be relatively unobtrusive.

With stripes, geometric patterns, or large-scale prints, pattern matching becomes much more important.

The Headrail Has More Work to Do

A wider shade places greater demands on the top structure and lift system.

Proper installation therefore becomes increasingly important as the treatment gets larger.

For a large custom Roman shade, the brackets must be installed into an appropriate mounting surface rather than treated as a purely decorative attachment.

Are Motorized Roman Shades Better for Large Windows?

Motorization can be extremely useful on large Roman shades, but not for the reason many homeowners assume.

At Morrahome, motorization does not increase the maximum width beyond 78 inches.

Both cordless and motorized Roman shades have a maximum width of 78".

The main size advantage of the motorized system is height.

Morrahome's standard corded and cordless Roman shades can be made up to 90 inches high, while motorized Roman shades can be made up to 110 inches high.

That makes motorization especially relevant for tall windows.

It can also make everyday operation easier when:

• the shade is large;
• the window is tall;
• furniture makes the shade difficult to reach;
• several shades are installed across the same wall;
• the homeowner wants more convenient daily control.

Motorization should therefore be viewed as an operating upgrade, not as a way to ignore manufacturing size limits.

A motorized shade still needs to be designed within the approved dimensions of the system.

If motorized operation is a priority, the Harper Custom Linen Roman Shades are the primary Morrahome option to evaluate for a standard-mounted large window.

When Does a Tall Window Need Motorization?

For Morrahome, height provides a particularly clear decision point.

If a Roman shade needs to be between 91 and 110 inches high, motorization is the available operating system within the current manufacturing specifications.

For example:

70"W × 88"H Window

This size may potentially work with several operating systems.

70"W × 102"H Window

The width is still below 78", but the height exceeds the 90" limit for the standard corded and cordless systems.

A motorized shade becomes the appropriate option.

82"W × 102"H Window

Motorization does not solve the problem entirely.

The height fits within the motorized range, but the width exceeds the 78" maximum.

The opening should therefore be evaluated as a multiple-shade installation.

This distinction is important:

Motorization can extend the available height, but it does not extend Morrahome's maximum width.

Can No-Drill Roman Shades Work on Large Windows?

Yes, but no-drill Roman shades have a smaller size range than Morrahome's other systems.

The current no-drill range is:

24"–62" wide × 20"–90" high

This means a window can be considered “large” without necessarily being suitable for one no-drill Roman shade.

For example, a 70-inch-wide window may still fit within the width range of a cordless or motorized Roman shade, but it is wider than the current 62-inch maximum for a single no-drill system.

In that situation, the homeowner has three basic choices:

• use a standard mounted Roman shade;
• evaluate whether the window can logically be divided into multiple no-drill shades;
• select a different installation approach.

No-drill should therefore be chosen because the installation method fits the window—not simply because it sounds easier.

If no-drill installation is the priority, review the Harper Custom No-Drill Roman Shades and confirm that each individual window section meets the required dimensions and mounting conditions.

What Is the Best Roman Shade Style for a Wide Window?

For most large functional windows, a flat Roman shade is usually the strongest starting point.

Flat Roman shades have a relatively simple face and form clean horizontal folds when raised.

On a wide window, that has several advantages.

The treatment tends to look less bulky, patterned fabrics remain easier to see when the shade is lowered, and the overall appearance works with a wide range of interior styles.

Flat Roman Shades

Best suited for homeowners who want:

• a clean look;
• modern or transitional interiors;
• large picture windows;
• wide window banks;
• patterned fabrics;
• a relatively structured finished appearance.

Soft or Hobbled Roman Shades

Hobbled styles retain visible folds even when the shade is fully lowered.

They can create a richer, more traditional appearance, but they also use more fabric.

On an oversized shade, more fabric also means more material for the lift system to manage.

This does not make soft-fold Roman shades unsuitable for large windows. It simply means finished size matters even more.

Relaxed Roman Shades

Relaxed Roman shades have a curved or softly drooping bottom.

They can work beautifully when the goal is decorative softness rather than architectural precision.

For a very wide functional window, however, a flat style is often easier to keep visually balanced.

If precise symmetry is important, particularly across several adjacent windows, a more structured Roman shade style is usually the safer option.

What Fabric Works Best for Roman Shades on Large Windows?

Fabric selection becomes more important as the Roman shade gets larger.

A fabric that behaves beautifully on a 30-inch shade may behave differently across a 70-inch-wide surface.

Instead of choosing based only on color, consider four things.

1. Fabric Weight

Heavier fabric creates a heavier finished shade.

That does not automatically make it unsuitable, but weight needs to be considered together with shade width, height, lining, and lift system.

2. Fabric Stability

Roman shades need fabric that folds predictably.

Some fabrics naturally hold structure better than others.

Very soft, loose, stretchy, or unusually heavy fabrics may require additional consideration before being used on a large functional Roman shade.

3. Pattern Repeat

Large geometric designs, stripes, florals, and directional prints should be planned carefully.

The larger the window, the more noticeable pattern placement becomes.

If multiple shades are installed side by side, pattern alignment between the shades can become part of the overall design.

4. Fabric Width

Extra-wide Roman shades may require multiple fabric widths depending on the textile selected.

This can introduce seams.

For customers who strongly prefer an uninterrupted surface, fabric construction should therefore be considered before the final shade configuration is selected.

For a large custom Roman shade, ordering fabric samples before purchasing is especially useful.

A computer screen can show approximate color, but it cannot accurately show weight, texture, weave, opacity, or how the fabric behaves in real light.

Are Blackout Roman Shades Good for Large Windows?

They can be, particularly in bedrooms, nurseries, media rooms, and other spaces where light control matters.

Blackout lining significantly reduces the amount of light passing through the face of the Roman shade.

However, homeowners should distinguish between:

blackout fabric

and

a completely blackout window installation.

They are not the same thing.

Even with blackout lining, light can enter:

• around the sides of an inside-mounted shade;
• above or below the treatment;
• through the space between two adjacent Roman shades.

This becomes especially important on oversized windows that need to be divided into multiple shades.

If maximum room darkening is required, consider:

• outside mounting;
• additional overlap around the window opening;
• carefully positioning the breaks between shades;
• layering Roman shades with drapery.

Blackout lining also adds material to the shade, so its effect on the finished treatment should be considered when designing a very large Roman shade.

For a large window where blackout is a priority, the Harper Custom Linen Roman Shades are the primary standard-mounted option to compare.

Inside Mount vs. Outside Mount for Large Roman Shades

Both can work.

The better choice depends on the window construction and the result you want.

Inside Mount

An inside-mounted Roman shade is installed within the window opening.

It creates a clean, built-in appearance and leaves the window trim visible.

For a large window, check:

• available mounting depth;
• whether the top of the opening provides a suitable mounting surface;
• whether the window is square;
• the position of mullions or other obstructions.

Large older windows can sometimes vary slightly in width from top to bottom.

Accurate measurements therefore matter.

Outside Mount

An outside-mounted shade is installed above or beyond the window opening.

This is often useful when:

• the frame is too shallow for inside mounting;
• greater light coverage is needed;
• you want to visually enlarge the window;
• trim or hardware interferes with an inside installation.

An outside mount can also help reduce edge light around blackout Roman shades because the fabric can extend beyond the glass opening.

The trade-off is that an outside-mounted shade covers more wall or trim.

Neither installation style is inherently better for a large window.

The correct decision depends on mounting space, light control, appearance, and the actual window construction.

Roman Shades for Large Picture Windows

Picture windows are one of the most natural applications for Roman shades.

Because the glass is usually fixed, there is no need to account for a door that must be opened repeatedly.

The key decision is whether the window should visually read as one opening or several sections.

For a picture window under 78 inches wide, one Roman shade may create the cleanest appearance.

For a picture window wider than 78 inches, look for architectural divisions.

If there is a center mullion, two Roman shades may look more natural than trying to treat the entire opening as one oversized unit.

If there are three distinct window sections, three shades may provide better proportions and greater control.

Use the window's structure to guide the layout.

Roman Shades for a Wall of Windows

A wall of windows should usually be designed as a group rather than treated as several unrelated openings.

If four windows sit side by side, the Roman shades should normally share:

• the same fabric;
• consistent mounting heights;
• coordinated proportions;
• similar fold appearance.

The shades can still operate independently.

That is one of the biggest advantages of using multiple Roman shades.

You can lower one section for glare or privacy while leaving the rest of the wall open.

Motorization can make a multi-window installation even more convenient, particularly when the windows are tall or difficult to reach.

The key visual principle is consistency.

Multiple Roman shades should look like one deliberate window-treatment system rather than several shades that happened to be installed next to one another.

Should You Align Roman Shades With Window Mullions?

In most cases, yes.

This is one of the most useful rules for designing Roman shades across a large opening.

A mullion already creates a vertical interruption in the window.

Placing the gap between two Roman shades over that same line makes the separation feel intentional.

By contrast, placing the gap across the middle of an uninterrupted glass pane can make the installation appear visually arbitrary.

So when deciding how many Roman shades to order:

A 120-inch window does not automatically need two 60-inch shades.

If the window is actually composed of three approximately 40-inch sections, three shades may produce a better result.

Are Roman Shades Good for Sliding Glass Doors?

Sometimes—but not always.

This is one situation where the answer should be based on function rather than appearance.

Roman shades travel vertically.

Sliding glass doors open horizontally.

If one Roman shade covers an entire sliding door, it usually needs to be raised before someone can comfortably walk through the active door panel.

If the door is used only occasionally, that may not be a major inconvenience.

If the door is used dozens of times every day, it may become frustrating.

One option is to use separate Roman shades corresponding to the individual glass panels so the active section can be raised independently.

But depending on how frequently the door is used, a horizontal-moving treatment or drapery may simply be more practical.

Roman shades are not automatically the best treatment for every large opening.

A good window treatment should work with how the window or door is actually used.

Will a Wide Roman Shade Sag?

A properly designed Roman shade should be manufactured within the specifications of its components and installed correctly.

However, as a shade gets wider, the mechanical and visual demands increase.

That is one reason Morrahome does not treat maximum size as a competition to produce the widest possible shade.

The current manufacturing limits are intended to maintain reliable operation and a clean appearance within the tested production range.

For homeowners, the practical takeaway is simple:

Do not assume that the largest technically possible shade is automatically the best configuration.

If a window is wider than the recommended single-shade range, dividing the opening into multiple Roman shades is often a better long-term solution.

How to Measure a Large Window for Roman Shades

Custom Roman shades depend on accurate measurements.

For a large opening, small measuring errors can become especially important.

For an Inside Mount

Measure the inside width at:

• the top;
• the middle;
• the bottom.

Also measure the height at multiple points.

Follow the measuring instructions for the specific product rather than making your own deductions.

If the manufacturer applies an inside-mount deduction during production, deducting again yourself can result in a shade that is too narrow.

For an Outside Mount

Measure the coverage you actually want rather than simply measuring the glass.

Consider:

• how far the shade should overlap each side;
• where the brackets will be installed;
• whether trim should remain visible;
• whether additional overlap is needed for privacy or room darkening.

For Multiple Roman Shades

Measure more than the overall opening.

Also record:

• the position of each mullion;
• the width of each individual window section;
• trim dimensions;
• obstructions;
• available mounting areas.

For a 140-inch-wide window wall, saying “my window is 140 inches wide” is not enough information to determine the best shade configuration.

The structure of that 140-inch opening matters just as much as the overall width.

When Roman Shades Are Not the Best Choice for a Large Window

Roman shades are versatile, but there are situations where another treatment may work better.

Consider another solution when:

The Opening Is a Frequently Used Sliding Door

Repeatedly lifting a large Roman shade to walk through the door may become inconvenient.

Your Desired Configuration Exceeds the Manufacturing Range

It is usually better to divide the window or select another treatment than to force a Roman shade beyond the size range for which it was designed.

Near-Total Darkness Is Essential

Multiple shades can introduce small gaps.

Depending on the room, a layered window treatment may provide better room darkening.

You Want an Extremely Soft Wall-to-Wall Fabric Treatment

Drapery may create that appearance more naturally than several Roman shades.

Choosing another treatment when it functions better is not a compromise.

It is good window-treatment design.

So, How Wide Is Too Wide for a Roman Shade?

There is no universal industry number that applies to every Roman shade.

But for Morrahome's current products, the answer is clear:

If your opening is wider than that, Roman shades can still work.

The solution is generally to use multiple shades.

For example:

These are configuration examples, not exact ordering dimensions.

The actual width of each shade should be determined from the window measurements and mounting method.

FAQs About Roman Shades for Large Windows

Can Roman shades be made for a 100-inch-wide window?

Yes, but not necessarily as one shade.

Morrahome's current maximum width for an individual Roman shade is 78 inches, so a 100-inch-wide opening would normally be divided into two or more Roman shades.

If the window has a center mullion, two shades aligned with that mullion are often a practical solution.

Can Morrahome make a 100-inch-wide Roman shade?

No. Morrahome's current maximum width for a single corded, cordless, or motorized Roman shade is 78 inches.

For an opening wider than 78 inches, the recommended approach is generally to use multiple shades.

What is the widest Morrahome Roman shade?

The maximum width is:

• 78 inches for corded Roman shades;
• 78 inches for cordless Roman shades;
• 78 inches for motorized Roman shades;
• 62 inches for no-drill Roman shades.

What is the tallest Morrahome Roman shade?

Motorized Roman shades can currently be made up to 110 inches high.

Corded, cordless, and no-drill Roman shades have a maximum height of 90 inches.

Does motorization allow a wider Roman shade?

No.

Morrahome's motorized and cordless Roman shades both have a maximum width of 78 inches.

The main size advantage of motorization is height. A motorized Roman shade can be made up to 110 inches high compared with 90 inches for the standard corded and cordless systems.

Motorization can also make large or difficult-to-reach shades more convenient to operate.

Are two Roman shades better than one large Roman shade?

It depends on the window.

One Roman shade provides a cleaner, uninterrupted fabric surface.

Two or more shades provide independent light control and allow very wide openings to be treated without exceeding the size limits of an individual shade.

For windows with mullions, multiple shades often work particularly well because the gaps between the shades can align with the existing window divisions.

Can I put three Roman shades on one large window?

Yes.

For a large window composed of three glass sections, three Roman shades can often be more visually balanced than two.

The best layout should follow the architecture of the window rather than simply dividing the total width into equal numbers.

Are Roman shades good for large picture windows?

Yes.

Roman shades are particularly well suited to large picture windows because the treatment can provide privacy, light control, softness, and fabric texture without requiring the floor space of traditional drapery.

For picture windows wider than 78 inches, multiple Roman shades are usually required with Morrahome's current manufacturing specifications.

Are motorized Roman shades worth it for large windows?

They can be.

Motorization is particularly useful for tall shades, hard-to-reach windows, shades behind furniture, or groups of windows that are operated frequently.

For Morrahome, motorization is also required when the finished Roman shade height exceeds 90 inches and remains within the motorized maximum of 110 inches.

Can no-drill Roman shades be used on wide windows?

Morrahome's no-drill Roman shades can currently be made up to 62 inches wide.

For a wider window, a single no-drill shade would fall outside the current size range.

Depending on the window structure, multiple no-drill shades may be an option if each individual section meets the required dimensions.

Can blackout Roman shades cover a large window?

Yes.

Blackout lining can significantly reduce light passing through the Roman shade itself.

However, light may still enter around the outside edges or through gaps between multiple shades.

For stronger room darkening, outside mounting, additional overlap, or layering with drapery may be worth considering.

Should Roman shades on a wide window be inside mounted or outside mounted?

Both can work.

Inside mounting creates a cleaner recessed appearance but requires sufficient mounting depth.

Outside mounting can provide greater coverage around the window and may improve privacy and room darkening.

The right option depends on the window frame, mounting surface, shade configuration, and desired appearance.

What Roman shade style is best for a large window?

For most large functional windows, flat Roman shades are a strong starting point.

Their cleaner construction works well across wide openings and with many different interior styles.

Soft-fold or relaxed Roman shades can also work, but the additional fabric and more decorative shape should be considered carefully on very large shades.

What Is the Best Roman Shade Setup for Your Large Window?

For a large window, start with three questions:

1. How Wide and Tall Is the Opening?

If a single shade is wider than 78 inches, plan for multiple shades.

If the shade needs to be taller than 90 inches but no more than 110 inches, consider motorization.

2. How Is the Window Divided?

Look for mullions and individual glass sections.

Whenever practical, align separate Roman shades with those divisions.

3. How Will You Use the Room?

Consider whether you need:

• privacy;
• blackout;
• independent light control;
• frequent operation;
• motorization;
• no-drill installation;
• easy access to a door.

The best large-window Roman shade is not simply the biggest shade.

It is the configuration that balances appearance, reliable operation, light control, installation, and everyday use.

For one large picture window, that may be a single flat Roman shade.

For a 10-foot wall of windows, it may be two or three coordinated shades.

For a tall bedroom window, it may be a motorized blackout Roman shade.

And for a frequently used sliding glass door, another type of treatment may sometimes be the more practical choice.

That is what makes custom window treatments useful: the product should be designed around the window rather than forcing every window into the same solution.