How to Specify Custom Drapery for Your Client's Project

The specification is where custom drapery either becomes an elevated finish or a source of avoidable problems. Fabric, fullness, header, lining, hardware, and finished dimensions are not independent decisions. They interact. A fullness ratio that works beautifully on pinch pleat will look sparse on ripple fold. A blackout lining that adds weight will demand a different header construction than a simple cotton sheer. A hardware depth that worked on the designer''s last project may not clear a new window with deeper trim.

For interior designers working with a custom fabrication workroom, the quality of the specification determines how much of the project will run smoothly and how much will require mid-project corrections. A clean specification moves through the workroom without friction. An incomplete or inconsistent specification generates questions, delays, and sometimes compromises that show up in the finished installation.

This pillar post is a working reference for specifying custom drapery. It covers the decisions that belong in every specification, the interactions between those decisions, and the details that separate drapery that looks good from drapery that looks elevated. For the broader workroom partnership context, see the Interior Designer''s Guide to Partnering with a Custom Fabrication Workroom.

Start with the Finished Dimensions

The first specification decision is always finished dimensions. Finished width, finished length, and stack allowance together define the hardware requirements and fabric yardage for the project.

Finished width should extend beyond the window opening to allow panels to stack clear of the glass when open. For standard pinch pleat drapery with fullness ratios between 2.0x and 2.5x, the finished panel pair should cover approximately 120% of the window opening width to allow a clean stack on each side. For wider windows or multiple-panel configurations, the stack allowance calculation needs more careful math so that each panel clears the glass when drawn open.

Finished length is the distance from the top of the header to the hem. The standard choices are floor-length (hem breaks at or just above the floor), puddle (hem extends 2 to 4 inches onto the floor), or break (hem sits 1/2 inch above the floor for a crisp line). Each length choice carries tradeoffs. Puddle is dramatic and traditional but collects dust and can look heavy. Break is clean and modern but leaves no tolerance for floor slope, which varies across most residential rooms. Floor-length is the middle ground and typically the safest specification for rooms where dust accumulation and vacuum access matter.

Stack allowance is the horizontal space the panel occupies when drawn open. Pinch pleat panels stack tighter than ripple fold. Blackout linings stack heavier than unlined or sheer panels. On windows where the stack needs to clear decorative molding, window casings, or an adjacent window, the stack allowance math becomes a gating constraint on the entire hardware specification.

Choose the Header Style

The header defines the visual language of the drapery and constrains several downstream specifications including fullness, hardware, and fabric quantity.

Pinch pleat is the traditional formal header with deep pleats sewn at the top of the panel. Pinch pleat drapery uses fullness ratios between 2.0x and 2.5x and hangs on rings, rings with decorative hooks, or directly on hardware with integrated clip systems. Pinch pleat reads as traditional, classic, and elevated. It is the default specification for formal rooms, dining rooms, and libraries.

Inverted pleat (also called box pleat) reverses the pinch pleat, creating a flat face with pleats hidden behind the panel. Inverted pleat reads as contemporary and tailored. Fullness ratios are similar to pinch pleat but the front face is flatter. Inverted pleat works in transitional and modern residential projects where the room language is cleaner than traditional.

Ripple fold (also called wave) creates a continuous S-curve along the full length of the panel. It requires a specific track system with evenly spaced carriers, and the fullness is determined by the carrier spacing. Ripple fold reads as modern and architectural. It stacks very tightly, which makes it the right choice for large spans of glass where stack space is at a premium.

Tailored pleat (also called French pleat or two-finger pleat) is a variation on pinch pleat with two pleat fingers instead of three. It reads slightly more casual than pinch pleat and is often specified in rooms where pinch pleat would feel too formal.

Grommet threads directly onto a rod through metal grommets set into the top of the panel. It is casual, contemporary, and common on draperies that will be drawn frequently because the grommets glide easily along the rod.

Rod pocket sews a sleeve at the top of the panel that the rod passes through. Rod pocket is the most casual header and is typically specified for stationary panels rather than functional (drawing) drapery.

Set the Fullness Ratio

Fullness is the ratio of panel fabric width to finished panel width. A 2.0x fullness means the panel was cut at twice the finished width before being pleated and sewn to the finished dimension. Fullness controls how the drapery appears when drawn closed.

Too little fullness looks sparse. The fabric reads as flat and institutional. Too much fullness looks heavy and can push pleats into inconsistent spacing.

Standard fullness ratios by header:

• Pinch pleat, inverted pleat, tailored pleat: 2.0x to 2.5x
• Ripple fold: 2.5x (determined by carrier spacing on the track)
• Goblet pleat: 2.5x to 2.75x (goblet pleats need more fullness to hold shape)
• Grommet: 1.75x to 2.0x (grommets do not hold as much fullness before looking bunched)
• Rod pocket: 1.75x to 2.0x for stationary panels

Fabric weight affects the final choice within these ranges. Heavier fabrics hold fuller specifications better. Lighter fabrics at 2.5x fullness can look wispy and may be better at 2.0x.

Specify the Lining

Lining is the invisible decision that determines how the drapery performs. The specification should address both the drape function and the light control requirements.

Unlined drapery is the lightest and most luminous. Fabric character shows through naturally. Unlined panels are appropriate for sheers, casement-weight fabrics, or decorative panels where no light control is needed.

Lined drapery adds a basic cotton or polyester lining to the back of the fabric. Lining improves the hand, protects the face fabric from UV damage, and gives the panel a finished look from outside the window. Standard lining is the default specification for most custom residential drapery.

Blackout lined adds a light-blocking layer. Blackout lining is appropriate in bedrooms, media rooms, and any space where total light control is a functional requirement. Blackout panels require additional allowances for stack depth because the added layer increases the panel thickness.

Interlined adds a layer of soft interlining between the face fabric and the lining. Interlining produces a fuller, more luxurious drape and improves thermal insulation. Interlined drapery is the highest construction tier and is specified for formal rooms, high-end residential projects, or climates where the thermal benefit matters.

Select the Hardware

Hardware specification needs to match the header style, panel weight, and the room''s aesthetic direction.

Rod diameter scales with window width and panel weight. Narrow windows with lightweight panels work with 1.25-inch rods. Wider spans and heavier construction require 1.5-inch or 2-inch rods. Traverse rods and motorized tracks have their own sizing systems.

Bracket style depends on mount depth requirements and aesthetic preference. Standard brackets mount close to the wall. Extension brackets create clearance for layered treatments such as sheers behind opaque drapery. Ceiling-mount brackets eliminate wall mounting entirely for floor-to-ceiling installations.

Finial choice is a visible design decision. Traditional finials are ornamental and coordinate with the room language. Modern finials are simpler, often end caps or minimal sculptural shapes. Finial choice should match the header formality.

Motorization for drapery tracks integrates with smart home systems including Lutron, Crestron, Control4, and Josh. Motorization adds a layer of specification including power source, control protocol, and programming requirements.

The Roseworks hardware collection includes over sixteen exclusive collections and twenty finishes. For designers who need to review hardware options alongside fabric selections, a workroom visit allows side-by-side evaluation in the showroom.

Document Fabric Selection

Fabric specification is often the designer''s most confident territory, but several details still matter for a clean workroom handoff.

Pattern and colorway should be documented by full fabric name, collection, and colorway reference. Pattern-specific details including repeat size, railroad or up-the-roll orientation, and pattern matching requirements need to appear on the specification.

Yardage calculation is the workroom''s responsibility when complete spec information is provided. The designer or showroom should not assume yardage and place fabric orders independently. Yardage errors are the most common cause of mid-project delays.

Source and shipping coordination needs to be documented so the workroom knows where fabric is coming from and when to expect it. For fabric shipped from the showroom, the designer should coordinate shipping directly to the Roseworks workroom address.

Pattern matching preferences should be explicit. Some patterns match cleanly across panel widths. Others have irregular repeats that require judgment calls. The designer specifies the matching priority so the workroom knows how to cut.

Communicate Edge Cases and Custom Details

Every project has details that fall outside standard specifications. A curved window. A bay configuration. A pair of French doors where the drapery needs to clear the door swing. A custom trim or banding detail on the leading edge. A specific pleat spacing that the designer has used successfully before.

These details belong in the specification package as explicit notes, photographs, or sketches. Workrooms that receive complete edge case documentation can plan the fabrication accordingly. Workrooms that discover edge cases mid-fabrication have to pause, clarify, and sometimes rework panels.

For complex specifications, a pre-fabrication specification review between the designer and the workroom catches edge case issues before cutting begins. Roseworks offers this review for trade partners on projects where custom details warrant the extra coordination. Learn more about our custom drapery services.

To submit a project specification to Roseworks, use the contact form or review the difference between retail window treatments and custom fabrication for context on why custom specification matters. For timeline planning on your client communications, see managing client expectations on custom window treatment timelines.

Related project showcases: See this specification approach in practice in the Cherry Creek Residence full-home drapery project and the Boulder designer collaboration with pinch pleat curtains and motorized shades.