Best Retrofit Motor for Existing Curtains to Automate the Home You Already Have

A retrofit motor for existing curtains adds automation without replacing the rod, the track or the fabric already in place. The five picks below cover three buyer profiles: renters who cannot rewire a wall, homeowners who want drapery to open on a schedule, and anyone motorizing roller shades rather than side-opening curtains. The overview table below sorts every pick by fit and price tier so a decision can be made in under a minute; the full reviews follow.

Overview of the Picks

Product	Key Spec	Best Use	Price Tier
800RC Remote Controlled Drapery Motor	Remote-controlled drapery motor	Existing drapery tracks	Premium
Aura SmartShade Motor	Fits shades up to 3 kg (6.6 lb), WiFi dongle included	Beaded-chain roller shades, Alexa and Google Home	Mid-range
Rollerhouse Roller Blinds Tubular Motor	Fits 1-3/8 inch (35mm) tube, rechargeable lithium battery	Tubular roller blinds	Mid-range
SwitchBot Curtain 3 Urail	Bluetooth control, U-rail track	U-rail curtains, app control	Budget
QS25LE Roller Blind Motor Kit	Fits 1.5" tubes, remote included	Roller blinds and shades on a budget	Budget

1. 800RC Remote Controlled Drapery Motor for Existing Drapery

Type: Remote-controlled drapery motor
Intended use: Existing drapery
Control: Remote
Power source: Motorized drive unit
Best for: Side-opening drapery on an existing track

800RC Remote Controlled Drapery Motor for Existing Drapery

This is the pick built specifically for drapery that already hangs on a track, which is the hardest case to solve with a retrofit. The unit is a motorized drive that pulls the existing carriers along the track, and it is operated from a handheld remote rather than a phone app. It suits traditional side-opening curtains — the heavy fabric panels in a living room or bedroom — rather than roller shades.

The trade-off is integration: there is no app, no voice assistant and no scheduling built into the remote, so automation stops at the button. Buyers who want Alexa routines or a sunrise schedule should look elsewhere. It is also the most expensive pick here, which reflects a dedicated drapery drive rather than a generic shade motor. Buyers with an existing track who want simple powered opening will find it the most direct fit of the five.

Trade-off: A remote-only control scheme and the highest price in the group mean buyers pay for drapery-specific hardware without smart-home features.

2. Aura SmartShade Motor for Beaded-Chain Roller Shades

Type: Smart shade motor
Intended use: Beaded-chain roller shades
Capacity: Shades up to 3 kg (6.6 lb)
Control: Alexa and Google Home, WiFi dongle included
Power source: Rechargeable
Best for: Chain-driven roller shades in a smart home

Aura SmartShade Motor for Beaded-Chain Roller Shades

This motor clips onto the beaded chain of an existing roller shade and pulls it, which means the shade itself stays exactly where it is. The WiFi dongle is included in the box, so Alexa and Google Home control work without a separate hub purchase. The stated capacity of 3 kg (6.6 lb) covers most standard window shades, and the rechargeable battery avoids running new wiring to the window.

The caution is the chain: this design depends entirely on a beaded-chain loop, so it does nothing for cordless spring shades, drapery panels or track-hung curtains. Buyers should confirm the shade has a chain before ordering. The 3 kg limit also rules out very large or heavy blackout shades. For a chain-driven shade in a home that already uses voice control, it is the most complete package in this roundup.

Trade-off: The motor only works with beaded-chain shades and tops out at 3 kg, so heavy or cordless shades are out of scope.

3. Rollerhouse Roller Blinds Tubular Motor

Type: Tubular motor
Intended use: Electric curtains and roller blinds
Tube fit: 1-3/8 inch (35mm)
Power source: Rechargeable lithium battery
Best for: Roller blinds built on a 35mm tube

Rollerhouse Roller Blinds Tubular Motor

A tubular motor slides inside the roller tube itself, so the hardware disappears and the blind looks factory-motorized. This unit is sized for a 1-3/8 inch (35mm) tube, the common size for residential roller blinds, and runs on a rechargeable lithium battery rather than mains power. That combination makes it a genuine retrofit: the existing blind, brackets and tube can stay.

The limitation is installation. The blind has to come down, the motor has to be fitted inside the tube, and the tube diameter has to match exactly — a 35mm unit will not fit a tube of another size. Buyers who are not comfortable disassembling a blind should plan on professional help. For anyone with standard 35mm roller blinds who wants a clean, hidden motor, this is the strongest technical match here.

Trade-off: Fitting requires removing the blind and matching the tube to 35mm exactly, which puts it beyond a purely tool-free install.

4. SwitchBot Curtain 3 Urail Automatic Curtain Opener

Type: Automatic curtain opener
Intended use: U-rail curtain tracks
Control: Bluetooth, app
Smart home: Add SwitchBot Hub for Alexa, Google Home and HomeKit
Best for: U-rail curtains with app-based scheduling

SwitchBot Curtain 3 Urail Automatic Curtain Opener

This is a robot that rides the curtain track and pushes the panels open and closed, so nothing is rewired and the existing rod or track stays put. The Urail version is shaped for U-shaped tracks, and the motor is the upgraded high-performance unit in the SwitchBot line. Bluetooth and the app work out of the box, covering schedules and manual control from a phone.

The catch is the hub. Alexa, Google Home and HomeKit control all require adding a SwitchBot Hub, which is sold separately and is not in the box — so the voice-control headline is a two-purchase path. The U-rail fit also means buyers with round rods or I-rail tracks need a different variant. For U-rail curtains and a phone-first setup, though, it is the least invasive way to motorize what is already hanging.

Trade-off: Voice assistant and HomeKit support need a separately purchased SwitchBot Hub, so the out-of-box experience is Bluetooth only.

5. QS25LE Roller Blind or Shade Motor Kit

Type: Roller blind motor kit
Intended use: Existing roller blinds and shades
Tube fit: 1.5" tubes
Control: Remote control included
Power source: Rechargeable battery
Best for: Budget motorization of 1.5" roller blinds

QS25LE Roller Blind or Shade Motor Kit

This kit takes the tubular-motor approach at the lowest price in the roundup: the motor goes inside the roller tube, a remote is included, and the battery is rechargeable. It is sized for 1.5" tubes, which covers a large share of older roller blinds and shades. For a homeowner testing automation on one window before committing to the whole house, that low entry cost matters.

The trade-off is the control ceiling. A handheld remote is the whole interface — there is no app, no scheduling and no voice control, so the blind opens when someone presses a button. Buyers who want sunrise routines should budget for a smart model instead. It is also tube-specific at 1.5", so measuring before ordering is essential. As a cheap, self-contained way to motorize an existing roller blind, it does the job.

Trade-off: Remote-only control with no app or voice support limits it to push-button convenience rather than true scheduling.

Before You Buy

• Compatibility: Match the motor to the hardware already installed — drapery track, beaded chain, U-rail or roller tube — because each pick here works with only one of those.
• Tube or track size: Tubular motors are sized to a specific tube diameter, and the Urail opener is shaped for U-shaped tracks, so measure before ordering.
• Power source: Rechargeable battery motors avoid new wiring but need periodic charging; confirm the motor is reachable for that.
• Control level: Remote-only units are cheaper but cannot schedule; app and voice control may require an extra hub.
• Weight limit: Chain-drive and tubular motors state a capacity, and heavy blackout shades can exceed it.
• Installation effort: Track-mounted and chain-drive motors are largely tool-free, while tubular motors require removing the blind.
• Included accessories: Check whether the remote, hub or WiFi dongle ships in the box, since missing pieces change the total cost.

Frequently Asked Questions

1. What is a retrofit motor for existing curtains?
   A device that adds powered opening and closing to curtains, tracks or blinds already installed, without replacing the window covering itself.

2. Can any curtain be motorized?
   No. Each motor is built for one hardware type — drapery track, beaded chain, U-rail or roller tube — so the existing hardware decides which pick fits.

3. Do these motors need an electrician?
   The rechargeable and track-mounted units here run on battery and generally do not, while tubular motors require removing the blind rather than rewiring.

4. Which pick works with Alexa or Google Home?
   The Aura SmartShade Motor includes a WiFi dongle for both, and the SwitchBot Curtain 3 needs a separately purchased SwitchBot Hub for voice control.

5. How is a tubular motor different from a curtain opener?
   A tubular motor hides inside the roller tube of a blind, while a curtain opener rides the track and pushes drapery panels along it.

6. What should be measured first?
   The tube diameter for roller blinds and the track profile for curtains, since both determine whether a given motor will fit at all.

Bottom Line

The 800RC Remote Controlled Drapery Motor is the top pick for traditional side-opening drapery on an existing track, because it is purpose-built for that job and needs no app or hub to work. Buyers motorizing roller shades instead should start with the Aura SmartShade Motor for chain-driven shades or the Rollerhouse tubular motor for 35mm tubes, while the SwitchBot Curtain 3 and QS25LE kit cover U-rail curtains and budget roller blinds respectively. Check the current price on Amazon before ordering, since the snapshot used here can change quickly.