Curtains, shades, blinds and shutters: how each works and what it suits

Every window treatment either slides sideways, rolls or folds up, tilts, swings open or stays on the glass. How it moves decides where it stacks, what it blocks when open and how it is operated, and that narrows each window to a short list.

1. How each kind moves Understand

Shops sort window treatments by price, brand and color. For choosing, a better sort is by how the thing moves. Every treatment slides sideways, rises and stacks at the top, tilts, swings open on hinges or stays on the glass. How it moves decides where it goes when it is open, how much glass it still covers, how it is operated and what it needs from the window frame. Once you know the movement, most of the other differences follow.

Curtains and draperies

A curtain is a hanging for a window or another opening, usually cloth, hung by its top edge and finished with hems, a casing, pleats or ruffles. The museum vocabulary that defines it, the Getty's entry for curtains, lists what curtains are for: privacy, light, draft control and decoration. The same vocabulary's entry for draperies describes draperies as curtains, especially long heavy ones, hung in arranged folds at the sides of an opening, sometimes over sheer curtains. A 1977 extension bulletin, Michigan State's How to Make Curtains and Draperies, draws the line by fabric: curtains are sheer or translucent and admit light and air; draperies are opaque or nearly so and usually lined. In this manual "curtain" covers both, and we say "sheer" or "lined" when the difference matters. Convention

A sheer is a curtain thin enough to see light through. A café curtain is a short, straight curtain, often in tiers, that covers the lower part of a window and sometimes the upper part too, as the Getty's café curtain entry puts it. A café curtain leaves sky light at the top and covers the part of the window a passerby looks into.

Curtains are the only family that can reach well past the window on every side. That makes them the family that can cover the light gaps at the edges of a window, make a small window look larger, and hang clear of the glass when open. It also means they need wall: wall beside the window for the stack, and wall above it for the rod.

Shades

A shade is one continuous piece of material that rises to the top of the window. How it rises changes how it looks and how much it takes up.

• Roller shades roll onto a tube at the top of the frame (the Getty's roller shade entry lists "roller blinds" as another name for the same thing). They take up the least room when open.
• Solar shades are roller shades in a screen-like weave. Their openness factor is the share of direct light that passes through the gaps in the weave; one maker gives a typical range of 1 percent to around 13 percent (Draper's note on view-through, 2022). They cut glare and keep some view. Glare in Daylight, glare and darkness explains how the color of the fabric changes what you see through it. Product-specific
• Roman shades are fabric that folds into horizontal pleats as it rises. The folds can be flat and crisp or soft and looped; Style and proportion covers the styles.
• Cellular shades (also called honeycomb shades) are two or more layers of pleated fabric joined so that they form air pockets, or cells, seen from the side. Hunter Douglas's guide to single-cell and cell-within-a-cell shades says both constructions come in many fabrics and opacities, and that the main difference between them is energy efficiency. Product-specific
• Woven shades are made of bamboo, grasses or reeds. They let light through the weave, so they filter light rather than block it unless they have a lining.

Blinds

Blinds are made of slats. The Getty's entry for venetian blinds describes overlapping horizontal slats that open or close, and that can be raised and gathered above the opening. That covers the 1 in vinyl or aluminum mini blind that many rentals come with, and the wider 2 in wood and faux wood blinds. A blind does two jobs that no shade does: tilted, it lets light in while blocking a direct view; raised, it clears most of the glass.

Vertical blinds hang their slats, usually called vanes, from a track at the top. The vanes tilt, and the whole set draws to one or both sides, so a vertical blind stacks at the side like a curtain. That is why it is common on sliding patio doors, where a treatment that rises would have to be raised every time someone walks through.

Shutters

Interior shutters are hinged panels, usually with tilting louvers, set in a frame fixed to the window opening or the trim. Open, the panels fold back into the room. They are the most permanent family: the frame is sized to the window, fixed with screws, and stays. One shutter maker's measuring guide, SelectBlinds' instructions for inside, outside and café-style shutters, calls for at least 2 1/4 in of depth from the glass to the outer edge of the casing for an inside mount, and adds 4 in or more to the width when the shutter is mounted outside the opening on its own frame. Product-specific A café-style shutter covers only the lower part of the window, like a café curtain.

Films

Window film is a thin plastic sheet applied to the glass. It has no stack, no cord and no hardware. The International Window Film Association's 2026 education guide sorts decorative film into diffuse (from partly frosted to fully white or black), patterned (with clear areas) and custom. A frosted film gives privacy all day and night while letting light through, which is why it suits a bathroom where no view is wanted. Reflective film is different: the same guide says its daytime privacy "virtually disappears" once the room is brighter inside than out, so at night it is the same as clear glass to someone outside. Privacy by day and by night explains why. Physical principle

Top treatments

A valance is a horizontal cloth hanging across the top of a window, generally to hide the tops of curtains and their hardware, as the Getty's valance entry describes it. A cornice is a rigid box across the top, made of wood, metal or a composition board and sometimes covered in fabric (the 1977 Michigan State bulletin's description). A lambrequin is a stiff, flat valance with a shaped lower edge that often comes down each side of the window; the Getty's lambrequin entry lists "pelmet" as another name for it. None of the three opens or closes, so none of them meets a privacy or darkness need on its own. They finish the top of a window, hide a roller or a rod, and can block a little light that escapes over the top of a curtain.

2. Where it stacks, and what it blocks when open

An open treatment does not disappear. It gathers somewhere, and wherever it gathers it covers wall or glass. For a shade or a horizontal blind, the gathered material at the top is its stack height. For a curtain or a vertical blind, the wall width the open treatment takes up beside the window is its stackback. Both are worth knowing before you choose, because a kind that stacks over the top third of a short window, or across half of a narrow one, takes away the daylight it was meant to let in.

The Shade Store publishes one of the few stack charts that compares kinds side by side. The figures below are from its stacking chart, for that maker's own products, by the height of the shade or blind. Another maker's product of the same kind can stack more or less; its own chart wins. Product-specific

Three patterns stand out. A roller shade's stack does not grow with height, because the fabric winds onto a tube. A blind's stack grows about an inch for every foot of height in this chart, because each slat adds its thickness. And a fabric Roman or a woven shade stacks several inches deep even on a small window, because the fabric folds back on itself.

Mounting changes what the stack covers

An inside mount fits within the window opening; an outside mount fixes to the trim or the wall around it. Inside, the stack hangs in front of the top of the glass. Outside, the treatment can be mounted above the opening so the stack sits over wall or trim instead, if there is room above the window. Hunter Douglas's inside versus outside mount guide asks for at least 2 in of level surface above the trim for outside-mount brackets, or a mount on the trim itself. Product-specific So measure the wall from the top of the trim to the ceiling before you shortlist a kind with a deep stack. Measuring for blinds and shades covers the two mounts in full.

Curtains stack beside the window

A curtain drawn open folds into a stack on each side (or on one side, for a one-way draw). The 1977 Michigan State bulletin puts the stack at about a third of the fabric width, more for heavy fabric and less for light, and says to plan the rod's length to suit. It also makes the point that matters most for small windows: drawn-back curtains on a small window cover more of the glass and shut out light, air and view, so the inside edge of an open curtain is best placed at the edge of the glass, with the stack on the wall. Convention That only works where there is wall beside the window. Measuring for curtains turns the stack into a rod width, and the curtain rod calculator does the arithmetic.

Shutters and films

Shutter panels fold back into the room, so they need clear space in front of the window: a bed, a desk or a sofa pushed against the sill can stop them opening fully. Film has no stack and nothing to clear, which is its advantage and its limit: it stays in place whether you want the view or not.

3. How it is operated, and a child in the home

How you open and close a treatment matters for daily use, and it matters for safety when a young child lives in the home or visits. The words used in shops and standards:

• Cordless: no operating cord. A cordless shade is raised and lowered by hand at its bottom rail; a curtain on a plain rod is pushed along by hand.
• Wand: a rigid rod that turns a blind's slats or draws a curtain or a vertical blind.
• Motorized: a motor raises and lowers the treatment, run by a remote, a switch or an app.
• Continuous loop: a loop of cord or bead chain at the side that turns a clutch to raise and lower a shade.
• Pull cord: one or more cords that raise the treatment and lock in place.
• Inner cords: the lift cords that run through a blind's slats or behind a shade's fabric. On some older blinds a child can pull them out into a loop.

The current voluntary safety standard, ANSI/WCMA A100.1-2022, counts a motorized product as cordless. It sorts products into stock (made before anyone orders it, including a stock product cut to size in the store or sold online) and custom (anything else). Under it, stock products have to be cordless, have a short static cord of 8 in or less, or have operating cords a child cannot reach; custom products may also use a few corded systems, such as a continuous loop held taut by a tension device. Federal law today makes the stock requirements mandatory through 16 CFR 1120.3, which still cites the 2018 edition. What the law requires of custom products, and the 2026 proposal to change it, are in Buying in Cords, children and fire.

This is one decision where the chapter gives no options. N.C. Cooperative Extension's Buying Blinds or Shades gives the same advice for homes with children or pets. Cord-free forms exist across the families: curtains on a rod pushed by hand, cordless and motorized shades and blinds, shutters, film. A product certified under the industry's Best for Kids program has no reachable cord that can form a loop; Labels and spec sheets explains what the label means and what it does not.

4. What rules a kind out

Before comparing what the kinds do well, cross out the ones the window will not take. Five things do most of the ruling out.

Depth

Depth is how far the window opening reaches from the front edge of the frame back to the glass or the sash. An inside-mount product needs a minimum depth to fix its brackets, and a larger depth to sit flush with the frame. Makers set both figures per product and per operation, so these are examples, not limits for the kind: Product-specific

• Bali's wood and faux wood blind guide: 3/4 in minimum for an inside mount; a 2 in wood blind with a wand tilt needs 3 7/8 in to recess fully.
• Levolor's custom cellular shade guide (2022): 1/2 in minimum for cordless and continuous loop, 5/8 in for corded, 2 in for motorized; 2 1/8 to 3 in to sit flush.
• SelectBlinds' shutter guide: at least 2 1/4 in for an inside-mount shutter.

Anything that sticks out of the sash, such as a crank, a lever handle or a sash lock, eats into the usable depth, because the treatment has to clear it. When the depth is too shallow for the kind you want, the answer is usually an outside mount or a different kind, not a different window. Measuring for blinds and shades shows how to measure it.

Damp rooms

Bathrooms and kitchens add steam, splashes and cooking grease. The Shade Store's Roman shade styles guide says the folds of a fabric Roman make it not the best choice for a bathroom with lots of moisture and humidity, that a flat fold holds less moisture than the gathered folds of its relaxed and pleated styles, and that tightly woven synthetics suit a bathroom better than linen. For kitchens, the same guide prefers a flat Roman in a tightly woven, easy-care fabric that sits close to the window, away from the cooking. Hunter Douglas's drapery buyer's guide says curtains in a kitchen or bathroom can stop just below the sill where longer ones would be in the way. Product-specific

That is as far as the sources we found go. For any other kind in a steamy room, ask the maker whether the product is made for a bathroom, and write the answer on the options sheet. Ask the authority

What is in the way

The window survey from What each window needs lists what sits at the window. The 1977 Michigan State bulletin gives the reasons each one matters. Windows that open inward or crank outward need the treatment clear of the sash and the crank. A baseboard radiator under a picture window is best left uncovered so it can heat the room. A treatment on a French door or a patio door should not stop the door being used. Convention A heater under the window also limits what can hang there: a 1971 Idaho extension sheet, Be an "Aware" Shopper, warns against hanging drapery over a heat unit, for air circulation and fire, and Cords, children and fire gives the current clearance figures for heaters.

Holes, leases and associations

Almost every kind is fixed with screws: brackets for a rod, a shade or a blind, a frame for a shutter. If your lease does not allow holes without permission, the kinds that need brackets stay on the shortlist only with written permission or a no-holes way of mounting them (a tension rod inside a deep frame is the common one). Some leases and associations also say what may show from the street or whether film may go on the glass. Those are terms to read and ask about, not something we can settle; Renters in Hardware and installing says what to ask. Ask the authority

A child in the home

Covered above: with a child under 9 living or visiting, anything with a reachable operating cord comes off the list.

5. Layers and the shortlist

A shortlist starts from the need you ranked first in What each window needs. The kinds left after crossing out are then compared on that one need. The table is compact on purpose: it says which families usually meet each need and what to watch. The kinds compared has the full table, one row per kind, with filters for need, room and a child in the home.

The privacy rows rest on one principle: people see into the brighter side, which is why a sheer works by day and fails after dark (Privacy by day and by night). Physical principle A top-down bottom-up shade opens from the top, the bottom or both, so it can cover the lower part of a window and leave sky light above; Hunter Douglas's top-down bottom-up guide suggests it for bedrooms and bathrooms where both daylight and privacy are wanted. Product-specific The darkness row rests on Hunter Douglas's light control and privacy page, which says opaque fabrics darken a room but do not entirely eliminate light, and names side channels, side panels and drapery as ways to cover the gaps at the edges. Light gaps in Measuring for blinds and shades explains where those gaps come from.

The heat row is the one most often oversold. In a 2013 Lawrence Berkeley National Laboratory simulation study for the Department of Energy, every attachment saved energy in cooling climates, while in heating climates insulating panels, storm panels and cellular shades saved the most and vertical louvered blinds gave little or no benefit. How the treatment was used changed the result. Heat, cold and condensation gives the figures with their conditions.

Layering two kinds

Many windows meet two needs better with two kinds than with one. The old pairing is a sheer for daytime privacy with an opaque curtain drawn at night; the 1971 Idaho sheet describes exactly that. Common modern pairs follow the same logic:

• A shade inside the frame for daily light control, with curtains outside it for the look, the night layer or the light gaps at the edges.
• Decorative curtains that stay put at the sides, with a working shade behind them. The Shade Store's drapery styles guide suggests this for its inverted pleat style, which it says does not stack well enough to be opened daily.
• One product with two layers: Hunter Douglas describes a shade with a sheer or light-filtering front and a room-darkening back panel that work separately. Product-specific

Two layers need two projections from the wall, so the outer one clears the inner one. Style and proportion covers the bracket depths.

Popularity is not suitability

For context only: a Department of Energy fact sheet on cellular shades (2021), citing a 2013 market study, puts vinyl or metal blinds at about 60 percent of US window coverings and curtains at 19 percent. Those are 2013 figures, and they say what people had, not what met their needs. A mini blind is common because it is cheap and often comes with the rental; it is a weak answer to darkness for day sleep: NIOSH's sleep environment page for shift workers notes that blinds can let too much light filter in.

7. See it See it

• Stacking chart, The Shade Store: stack heights for nine kinds of shade and blind at seven heights, on one page.
• Inside vs. outside mount, Hunter Douglas: when a frame is too shallow, and how much flat surface outside brackets need.
• Advanced Solar Control Education Guide 2026, International Window Film Association: the kinds of decorative and reflective film, and why reflective film stops giving privacy at night.
• Buying Blinds or Shades, N.C. Cooperative Extension (2023): a short buyer's view of blinds against shades, with cordless advice for homes with children.

8. Practice Practice

Minimum: one window, its ruled-out kinds crossed off, and two or three kinds written on the options sheet with a reason each. Time: about 30 minutes. Materials: a steel tape measure, the window's row in the window survey, your lease or association rules if you have them, and a phone or notebook.

1. Read the window's first need. Take it from the needs sheet of the window survey. If the sheet is empty, rank the needs first; What each window needs shows how.
2. Measure the depth and note what sticks out. Measure from the front edge of the frame to the glass or sash, then subtract anything that stands proud of the sash: a lock, a handle, a crank.
3. Measure the wall around the window. From the top of the trim to the ceiling, and from each side of the trim to the nearest wall, door, switch or piece of furniture.
4. Cross out. Go down the five tests in What rules a kind out: depth, damp, what is in the way, holes, a child. Write what each test removed.
5. Keep two or three. From what is left, choose the kinds that meet the first need, using the compact table above or the filters in The kinds compared.
6. Check each one's stack. For a shade or blind, look up its stack height in the maker's chart and ask whether it covers glass you want, or fits above the trim. For curtains, check there is wall beside the window.
7. Write the shortlist. One row per kind on the options sheet, with the kind, the operation and the reason in Why.

9. Your windows Your windows

This box reads your setup and points at the kinds that fit your rooms, your first need and whether a child lives with you or visits.

10. Check your work Check your work

Criteria

• Each kind on the shortlist meets the window's first-ranked need, and the Why column says how.
• Each ruled-out kind was ruled out by a named test: depth, damp, what is in the way, holes or a child.
• With a child under 9 living or visiting, nothing on the shortlist has a reachable operating cord.
• Each kind's stack is known, and it fits where it will sit (above the trim, beside the window, or over glass you accept losing).
• Any kind that needs holes in a rental has a note: permission asked, or a no-holes mount.

Worked example

The Adeyemi shortlist, checked. Nursery: both kinds meet darkness; both are cordless; the stack is small; the open depth is written as open, not assumed. Patio door: all three kinds address glare and leave the door usable; the Roman was ruled out by a measured stack, not by taste; the curtains' wall space was checked against the stack rule; nothing is corded. One gap: the solar shade's color is not yet chosen, and color changes how much view and heat it lets through (Glare). They add a sample request to the row. The shortlist passes.

Common mistakes

• Choosing by look first. The look is a real need, but when privacy at night or darkness ranks first, a kind that only looks right fails the window.
• Forgetting the stack. A Roman or a 2 in wood blind on a short window can cover a quarter of the glass when open. Check the chart against the window's height.
• Shortlisting an inside mount without measuring the depth. Measure, and subtract the lock or crank.
• Counting a cord cleat as child-safe. CPSC's interim steps reduce the hazard; cordless removes it.
• Treating reflective film as a night answer. It reverses after dark.
• Choosing what most people have. Market share says what is cheap and common, not what meets your need.

What is still unresolved

• The size to order for a shade or blind: Measuring for blinds and shades.
• The rod width, stack and length for curtains: Measuring for curtains.
• The fabric and lining: Fabric, linings and fading.
• Ready-made, custom or sewn, and samples at the window: Buying, ordering or making.
• Whether you may drill, and what the wall will hold: Hardware and installing, and your landlord or association.
• Whether a product suits a steamy bathroom: its maker.

11. Knowledge check and scenario

Checklist

• The choices sheet has a shortlist of two or three kinds for the window, with a reason for each.
• The kinds the window rules out are crossed off, each with the test that removed it.
• With a child living or visiting, every kind on the shortlist is cordless, motorized or has no cord.
• Each kind's stack checked against the wall above or beside the window.
• Motor power and who installs it noted for any motorized option. (Go deeper; optional)