Width is where ready-made fails hardest. Stock panels top out around 50 inches wide, and the windows that define modern houses (10 foot sliders, picture windows, whole glazed walls) need three to five times that per side once real fullness enters the math. The result is the most common sad sight in window treatments: a grand opening dressed in two stretched panels that close with a gap. Wide is a sewing problem, and sewing is the part we own.
The width math, honestly
Three numbers decide everything. Rod length: the span plus 6 to 10 inches per side, more on the widest openings, so open fabric stacks on wall instead of glass. Fullness: 2x to 2.5x the rod for pleated and ripple fold headers, which on a 12 foot slider means 24 to 30 feet of fabric width. And stack: a traversing drape at proper fullness stacks back roughly a quarter to a third of the width it covers, which is why the rod extensions matter and why we plan stack direction around how the opening is used. The measurement tool computes all three for your opening.
Sliders, picture windows, and walls
Sliding doors want a traversing treatment that clears the operating panel completely, stacked to the non-sliding side; ripple fold on a track is the modern answer and pinch pleat on rings the classic one, with hems at float or kiss so nothing drags in the doorway. Picture windows flip the priority to the view: stationary side panels at modest fullness frame the glass without ever covering it, which also halves the fabric bill. And full window walls are where drapery becomes architecture, usually ceiling-tracked, often motorized, and covered from the height side in the floor to ceiling guide.
Seams, done properly
Every wide panel is widths of 54 inch fabric joined in the workroom, and the seam is where quality shows. We match pattern repeats across every join, press seams flat, and place them so they fall inside folds rather than on faces. On sheers, where seams show more, we'll quote wide-width goods (some run 110 inches or more) that eliminate joins entirely across big spans. This is also the honest reason wide costs what it does: a 14 foot treatment at full fullness is 30-plus feet of fabric and a day of careful joining before the header is even built.
Weight, hardware, and motors
Wide fabric is heavy fabric. Tracks and rods on long spans need center supports and structure-anchored brackets, and traversing by hand gets less charming as the span grows: past ten feet or so, motorization moves from luxury to ergonomics, gliding a wall of fabric on a button or a schedule. We fit Somfy and Rollease Acmeda systems on wide treatments routinely; the full picture lives on the motorized page.
A recent extra wide order
Typical: a 12 foot slider in a family room, ripple fold pair in an oatmeal linen blend at 2.2x fullness, seamed from six widths, stacked to the fixed side, kiss length, on a wall-mounted track with three supports. It closes in one smooth pull and opens to a stack barely 20 inches deep. The stock alternative was four overlapping panels and a prayer; the custom version is one clean gesture.
Ordering, two ways
Nationwide: measure the span and drop, send photos, we review before cutting and ship rolled; the custom made curtains page walks the process. In LA and Ventura counties, measurement and installation are free, which matters most exactly here, where hardware planning is half the job. For the height dimension of big glass, see extra long curtains.
Frequently asked questions
How wide should curtains be?
Two to two and a half times the width of the rod, split across your panels, and the rod itself should run 6 to 10 inches past the frame on each side. That fullness ratio is what makes fabric fold instead of lying flat, and it's the number stock packaging quietly ignores. A 100 inch rod wants 200 to 250 inches of total fabric width; two stock 50 inch panels across it produce the flat, stretched look that makes people think they dislike curtains.
How much wider than the window should curtains be?
Think rod first, window second. The rod extends past the frame 6 to 10 inches per side so open panels can stack against the wall instead of the glass, and the fabric is then 2x to 2.5x the rod. So a 72 inch window on an 88 inch rod at 2x fullness wants about 176 inches of fabric across the pair, roughly two and a half times the window itself. On wide spans, be generous with the extensions: stack space is what keeps a big window feeling big when the curtains are open.
What are the best curtains for sliding glass doors?
A traversing style that clears the door completely: ripple fold on a track is the modern default, gliding easily at any width, and pinch pleat on a rod with rings is the classic alternative. Plan the stack on the non-sliding side so the operating door stays unobstructed, keep the hem at a float or kiss (a break drags every time someone walks through), and consider motorization once the span passes ten feet. Vertical sheer shades are the non-curtain answer for the same opening.
How wide can a single curtain panel be?
As wide as seaming allows, which is effectively as wide as you want: drapery fabric comes 54 inches wide as standard, and a workroom joins widths with pattern-matched seams that disappear into the folds. A single 14 foot panel is three or four widths sewn as one. The real limit is practical, since very wide single panels get heavy to traverse by hand, which is where splitting into a pair or adding a motor becomes the better engineering.
How wide should curtains be for a 72 inch window?
Start with the rod: 72 plus 6 to 10 inches per side gives you an 84 to 92 inch rod. At 2x to 2.5x fullness, that's 168 to 230 inches of total fabric width, so a pair of panels at 84 to 115 inches each. Compare that with the two 50 inch stock panels usually sold for this window and you can see why custom width is less about size availability and more about the fullness stock sizing skips. Our measurement tool runs these numbers for any window.