Buying Guide · September 2026

Curtain Track Types Explained: Single, Double, and Corner/Bay Window Configurations

A motorised curtain track isn't a single product — it's a stack of choices: how many curtain layers, what shape the track needs to be, and how the fabric hangs from it. Get these three right and a corner window or right-angled bay ends up with one clean, motorised curtain sweep instead of an awkward gap.

Single Track vs Double Track

Single track carries one curtain layer — either a sheer "day" curtain or a blackout "night" curtain, whichever you use most. It needs a recommended pelmet space of 10cm and above, and professional installation runs +$45 per track.

Double track (D+N) stacks two tracks on a shared ceiling bracket, so you get a day curtain and a night curtain on the same window — each with its own motor, each independently controllable. Running both together saves $20 on installation compared to booking two separate single-track jobs, but it needs more headroom: 18cm and above of pelmet space, since two rails and two curtain layers sit side by side. Double track always means two motors per window, since each layer is driven separately — for example, an Aqara Zigbee motor upgrade on a double track adds +$310 (2 × $155), not +$155.

Track Shape: Straight, L-Shape, and U-Shape

Shape is a separate decision from single/double. Every track starts as straight — no bends, the default, and the only shape available on DIY Sets. For windows that turn a corner, two bent options exist, both Customised Track only since the exact bend angle needs to be measured on site and fabricated at our factory:

90° L-Shape (one bend, +$60) suits a window that turns one true right-angle corner — a squared-off box bay with one 90° join, or a curtain that needs to wrap from a window onto an adjacent perpendicular wall.

90° U-Shape (two bends, +$120) suits a full three-sided box bay built at right angles, where the track needs to run out from the wall, across the recess, and back in again as one continuous curtain sweep.

Because bends are cut to your window's actual angles, they only come with a free on-site survey — there's no DIY bent-track option, and the calculator on our curtain track page automatically greys these out until you switch to Customised Track.

Bay and Corner Windows: Which Configuration Actually Fits?

The important detail: our L-shape and U-shape bends are fixed at 90°. That's ideal for a window that turns a genuine right angle — a corner living room glass wall, a window that continues onto an adjacent perpendicular wall, or a squared-off box bay built at 90°. A U-shape single track handles a three-sided 90° recess in one continuous motorised sweep; a two-sided 90° corner typically needs only an L-shape.

If you want both a sheer and a blackout layer on a 90° bay, you can combine shape and configuration — a U-shape double track is fabricated as two U-shaped rails on a shared bracket, each with its own motor. This is the most complex (and most capable) setup we offer, and it's always assessed at the free on-site survey since exact dimensions vary widely between units.

Where a bent track doesn't work well: most classic HDB-style bay windows use shallower, obtuse angles between panels rather than a true right angle, so a 90° track won't sit flush against the glass. For that shape, our recommendation is separate motorised blinds per panel, grouped into one scene so they still open together — see our HDB bay window guide for how that's configured. If you're not sure which situation your window falls into, our team will confirm during the free on-site survey — send us a photo on WhatsApp beforehand and we can usually tell right away.

Configuration & Shape at a Glance

One More Variable: Pleat Style

Track configuration and shape decide the mechanics; pleat style decides how the fabric hangs and glides. Double Pleat is the default — pinch-pleated curtains where each runner glides freely on the track, no extra cost. S/Ripple Fold creates a smooth continuous wave instead, with runners linked by an internal string and a studded ribbon sewn onto your fabric (we supply the ribbon, your fabric supplier sews it on). It's priced per runner (roughly $1.50/runner, one runner per 6cm of track) and — like the bent shapes — is Customised Track only, since the runner count depends on exact track length. On an L-shape or U-shape track, S-fold is worth considering specifically because the ripple keeps a consistent wave even as the curtain bends around the corners, which double pleat can look slightly bunched doing.

Putting It Together: A Corner Window Example

A right-angled 3-sided box bay or a corner living room glass wall, with a sheer day curtain and blackout night curtain, would be configured as: Customised Track (for the bend) → U-Shape (+$120) → Double Track (2× base price, 2 motors) → your choice of pleat style. It sounds like a lot of options, but in practice our team walks through all of this at the free on-site survey and gives you one clear quote — you don't need to configure bends or motor counts yourself.

Frequently Asked Questions