How to Write a Drapery Specification

An architect’s and designer’s guide to specifying custom drapery — and how Window25 can handle the technical details for you, at no cost.

Selecting a beautiful fabric is often the most enjoyable part of designing custom drapery.

But choosing the fabric is only the beginning.

What happens next determines whether the finished drapery looks and performs as the designer intended.

Will the folds hang properly? Will the pattern align across adjoining panels? Will the drapery stack neatly when opened? Will the hardware support the weight? Will the finished panels maintain the intended relationship to the floor?

These are not simply installation questions. They are specification decisions, and you should address them long before the fabric reaches the workroom.

At Window25, we believe that a well-written drapery specification is one of the best ways to protect the architect’s or designer’s original vision.

And we can help you write one — at no charge.

1. A Drapery Specification Is More Than a Fabric Schedule

A typical finish schedule might identify the fabric manufacturer, pattern, color, and perhaps the lining.

That's a good starting point, but it leaves many important decisions unanswered.

A complete drapery specification should establish how the entire system will be fabricated, supported, operated, and installed.

Consider two workrooms receiving the same fabric selection. Both might produce drapery that technically meets the designer’s request. Yet the finished results could look quite different because each workroom made its own decisions about fullness, seams, headings, hems, and hardware.

A specification removes those uncertainties before fabrication begins.

2. Eight Decisions Every Drapery Specification Should Address

You don't need to become an expert in drapery fabrication. But understanding these eight decisions will help you recognize what belongs in your project specifications.

1. Heading Style and Fullness

Ripplefold, pinch pleat, Euro pleat, and other headings produce different appearances and require different fabrication methods. Fullness affects fabric quantity, fold depth, stack-back, and the final appearance.

Your specification should establish the heading system and required fullness.

2. Seam Placement and Pattern Matching

Wide drapery panels often require multiple fabric widths. Where should the seams fall? Should patterns be centered on the opening? How should adjoining panels align?

Plan and approve these decisions before cutting.

3. Hems and Finished Edges

A standard 4-inch double hem, or a Euro-hem, can create different visual effects. Hem construction and concealed weights also influence how the fabric hangs.

The specification should define the desired hem and edge treatment.

4. Linings and Interlinings

Lining selection can affect light control, privacy, appearance, and how a fabric drapes. Interlining may add body and influence the finished folds.

Consider the face fabric, lining, and interlining together.

5. Hardware and Operating Systems

The track, carriers, brackets, and controls must accommodate the completed drapery, not simply the selected fabric.

Track capacity, panel weight, manual or motorized operation, and mounting conditions all require coordination.

6. Stack-Back, Returns, and Overlaps

Where does the drapery go when opened? Will it obstruct the glazing? Will the panels close adequately for privacy or light control?

These questions affect track length, pocket dimensions, and the architectural design.

7. Finished Dimensions and Floor Clearance

A drapery panel can be fabricated to the specified dimensions and still be the wrong length if finished flooring, track elevation, or heading construction changes.

Field verification and approved tolerances are essential.

8. Shop Drawings and Fabrication Approval

Who confirms the final details before fabrication?

Project-specific drawings, fabrication schedules, pattern-placement approvals, and representative samples help establish what will actually be delivered.

3. What Does a Proper Drapery Specification Look Like?

For commercial and architectural projects, drapery is commonly addressed under CSI Section 12 22 00 — Curtains and Drapes.

A comprehensive specification is generally organized into three parts:

Section	What it establishes
Part 1 — General	Scope, manufacturer, quality requirements, coordination, submittals, and approvals
Part 2 — Products	Fabrics, linings, headings, fabrication methods, hardware, and construction details
Part 3 — Execution	Field verification, installation coordination, finished dimensions, and quality control

A written Window25 specification follows this structure and goes further by establishing project-specific fabrication responsibility, pattern-placement approval, and quality-control requirements.

But here’s the important point:

The architect or designer shouldn't have to write every technical detail from scratch.

That's where an experienced drapery manufacturer can become a valuable partner in the specification process.

4. Why the Manufacturer Should Be Involved Before Construction Documents Are Complete

Consider a simple example.

An architect designs a beautiful ceiling-to-floor drapery installation with a recessed ceiling pocket.

The fabric is selected. The drawings are completed. The contractor builds the pocket.

Only later does someone discover that the pocket is too narrow for the required track and drapery depth, or that there isn’t enough space for the drapery to stack properly.

The solution may now require compromises to the original design.

If the drapery manufacturer had been involved earlier, we could have addressed these issues during design development.

At Window25, we help coordinate the relationship between the fabric, fabrication, hardware, architectural conditions, and installation before they become expensive problems.

5. Let Window25 Write Your Drapery Specification — Free of Charge

Send Us Your Project. We’ll Help You Write It.

We understand that architects and interior designers already have enough details to coordinate without becoming specialists in custom drapery fabrication.

That’s why Window25 offers a complimentary drapery specification-writing service for projects that designate Window25 as the basis-of-design drapery manufacturer.

You provide the design intent, architectural information, and fabric selections. We help develop the technical specification needed to translate that vision into a properly fabricated drapery system.

Depending on the project, our assistance can include:

• CSI-format Section 12 22 00 specification language.

• Drapery heading, fullness, and fabrication requirements.

• Seam placement and pattern-matching criteria.

• Lining, interlining, hem, and edge construction.

• Hardware, track, carrier, and motorization coordination.

• Recessed pocket, blocking, and stack-back requirements.

• Shop drawing, sample, and approval requirements.

• Finished-dimension, installation, and quality-control provisions.

The goal isn't simply to identify Window25 as the manufacturer. It's to give the design team a more complete, coordinated, and enforceable specification.