The Architect & Designer's Curtain Specification Guide (India 2026)

On a finished project, curtains are the last thing installed and the first thing the client touches every morning. Get the specification right and they read as architecture — clean recessed tracks, fabric that puddles exactly as drawn, a motor that hums shut against the afternoon sun. Get it wrong and they read as an afterthought: a surface rod screwed into a freshly painted wall, a track that fouls the false-ceiling cove, a motor with no power point within three metres. The difference is almost never the fabric. It is whether someone wrote a curtain specification early enough to drive the ceiling, electrical and joinery trades — instead of reacting to them.

Soft furnishings are detailed last and built first. The pocket, the power point and the pelmet have to exist in the ceiling and the wall before anyone hangs a single panel — so the curtain schedule is a construction document, not a shopping list.

This guide is the professional companion to the homeowner-facing complete curtain guide for Indian homes and the Window Treatments cluster pillar. It is about the document, the details and the coordination — how a practising architect or interior designer in India turns "we'll do curtains at the end" into a schedule that survives a site.

Start with a schedule, not a sample

Every window treatment package begins as a single table — the soft-furnishing schedule — built per window, not per room. It is the spine of the whole package: the BOQ, the tailor's order, the motor count and the client sign-off all flow from it. A workable schedule carries, for each opening: a window reference keyed to the drawings, the room, the treatment (sheer + dim-out, blackout only, blinds), fabric, fullness, heading, track or rod type, motor (yes/no and which model), and control side.

Number the windows to match the architectural drawings (W-01, W-02…) so the schedule, the BOQ and the site are speaking the same language. Two layers — a sheer plus a dim-out or blackout — is the professional default for most living and sleeping spaces; lock the pleat and heading per row before fabrics, because the heading drives both the look and the fabric quantity.

The false-ceiling pocket: detail it before the ceiling is built

This is the single most consequential coordination decision in the whole package, and it has a hard deadline: the false-ceiling pocket and any pelmet must be detailed and issued before the ceiling contractor closes the gypsum. There is no graceful retrofit.

A recessed curtain pocket is a slot — typically 150–200 mm wide and 150 mm deep for a single track, wider for a double (sheer + blackout) layer — left open in the false ceiling along the window wall, with the track fixed to the structural soffit or a noggin inside it. Key dimensions to hold:

• Width: allow for the number of layers. A double track needs roughly 120–150 mm of clear pocket; a sheer-plus-blackout-plus-motor stack can need 180–220 mm.
• Depth / clearance: the track must clear the ceiling lip so the fabric falls straight, not pinched against the gypsum edge.
• Light gap: a recessed blackout track still leaks light at the top unless you specify a return or a small lip — note it, because clients notice it in a bedroom.
• Return to the soffit: the bracket has to reach solid structure, not just board. Specify a noggin or a soffit-fixed angle.

The full geometry — pocket vs pelmet vs surface-mounted, and how the curtain reads as falling from the ceiling — is worked through in the ceiling-mounted curtains guide. The non-negotiable: issue this detail to the ceiling trade at the same time as the ceiling RCP, not after.

Motor points: a curtain decision the electrician owns

A wired motorised track is an electrical fixture, and it must appear on the electrical layout like any light point. The most common, most expensive site failure in this category is a beautifully specified motor with no power within reach. For every motorised window, the schedule must trigger a coordinated electrical point:

• A switched/spurred power point inside or beside the ceiling pocket, on the correct side for the motor head (left or right — fix this, because the motor isn't symmetrical).
• Loop wiring during first-fix, not surface conduit after paint. Mark it on the electrical drawing as "curtain motor point — W-0X".
• A neutral at the point if you are using smart relay control, and confirmation the chosen ecosystem (Wi-Fi, Zigbee or Matter) reaches that wall.
• Battery/RF motors dodge the power point but still need a charging plan and a clear note that they are battery, so the electrician doesn't wire a point that's never used.

The motor selection, torque-for-weight sizing and wired-vs-battery trade-off live in the motorised curtain tracks guide. The discipline here is procedural: a motor on the schedule must create a line on the electrical drawing in the same revision, or it will be missed.

Fabric allowances and wastage: where quantities really come from

Tailors quote in running metres of fabric, and under-ordering is the fastest way to a re-order delay at handover. The fabric quantity for a panel is, at its core, track width × fullness ÷ fabric width × number of drops, plus allowances — and the allowances are where amateurs lose money:

• Fullness: 2.0x is the professional standard for pinch and pencil pleat; 2.5x for sheers and wave; 1.5x only for deliberately flat, casual treatments. The fullness calculator converts a track width into fabric width per panel in seconds.
• Hem and header allowance: add roughly 20–30 cm per drop for the bottom hem and the heading turn-down.
• Pattern repeat: printed or woven repeats force you to round each drop up to the next full repeat — on a large repeat this can add 10–20% to the order. Always ask the supplier for the repeat before quantifying.
• Wastage / railroading: allow a realistic 8–12% wastage on top, and check whether a wide fabric can be railroaded (run horizontally) to avoid seams on tall drops.

Run the metres through the curtain cost calculator to turn fabric, fullness, lining and drop into a per-window rupee figure you can defend in a client meeting. For the fabric performance behind these numbers — fade resistance, weight, lining behaviour in Indian UV and damp — the curtain fabric guide is the reference.

Coordinating the three trades that can ruin it

A curtain package sits at the intersection of three trades, and the spec exists largely to keep them from colliding:

1. False-ceiling / gypsum — owns the pocket, the pelmet and the soffit noggin. Issue the pocket detail with the RCP; verify the open slot on site before the ceiling closes.

2. Electrical — owns the motor power points and any relay/hub wiring. Each motorised window must mirror onto the electrical drawing in the same revision, on the correct head side.

3. Joinery / carpentry — owns surface pelmets, valance boards and any boxed-out bulkhead. Coordinate its depth with the track so the fabric clears.

The most reliable safeguard is a single coordination markup: one window-wall elevation per typical condition showing the pocket, the track, the motor point and the pelmet together, signed off across all three trades. The hardware itself — brackets, supports, glides, weights and the wall fixings that carry heavy lined drapes — is detailed in the curtain hardware guide; confirm fixings reach structure, never just board.

Client sign-off: protect yourself before the tailor cuts

Fabric is cut to order and non-returnable, so a documented client sign-off is not optional — it is the line between a smooth handover and an absorbed re-order. Before any fabric is cut, get written approval on three things together:

• Physical fabric samples against the actual light of the room, plus the lining — daytime and with the lights on at night, because a sheer that screens by day becomes a window display after dark.
• The schedule itself — every window's treatment, drop (sill / below-sill / floor / puddle) and motorisation, initialled.
• The commercial picture — the per-window and total figure from the cost calculator, with the wastage and motor lines visible, so there are no surprises at the final bill.

Sign-off on samples and schedule together, dated, is what makes the cut irreversible with the client rather than against you.

The BOQ lines that should always appear

A complete curtain BOQ is more than "supply and install curtains." Break it so each trade and each cost is visible and measurable:

• Fabric — per window, by metre, by fabric type, fullness and lining noted.
• Stitching / making-up — per panel labour, with heading type.
• Track or rod — by type (surface, recessed, ceiling), by running metre, with brackets/glides.
• Motorisation — per motor unit + hub, separated into supply and install; battery vs wired flagged.
• Provisional sums — for the false-ceiling pocket forming and the electrical motor points, cross-referenced to those trades' BOQs so the cost lands somewhere and isn't double-counted or dropped.
• Allowances — wastage and pattern-repeat shown as a line, not buried, so a value-engineering exercise can see exactly what it is cutting.

Honest caveats from site

Three things the drawings never quite capture. First, site dimensions always win — never order fabric off design dimensions; re-measure every opening after plaster and ceiling are complete, because a 20 mm drift over a 3 m wall is real and visible. Second, tailor capability varies enormously in the Indian market; a wave heading or a perfectly aligned recessed double track demands a maker who has done it before — vet samples, not promises. Third, motors and ecosystems date faster than fabric; specify a current, widely supported protocol (Matter where you can) and leave the client a clear note of what they bought, because the support story matters more than the spec sheet two years on.

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Specify it properly with Studio Matrx. Anchor your package on the Window Treatments pillar and the complete curtain guide for Indian homes, size every panel's fabric with the curtain fullness calculator, and turn the schedule into a defensible per-window figure with the curtain cost calculator. Detail the pocket with the ceiling-mounted curtains guide and the motor points with the motorised curtain tracks guide — and you will hand over curtains that read as architecture, not afterthought.