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In this guide
Aqara's Smart Lock U200 does not replace a deadbolt; it takes over one. The inside thumb turn comes off, a motorized body and cylinder adapter go over the existing tailpiece, and a separate battery keypad mounts outside within about 2 meters. The exterior cylinder and the original key stay, so a key still opens the door. Aqara's US listing prices the U200 at $169.99 in Black or Silver, with each color in stock on 2026-10-09, and the rechargeable pack, five adapters, a hex driver, four AAA cells, a 3M sticker and the power-bank pouch included.
Two numbers decide whether that retrofit is the cheaper route. The lock is $169.99, but remote unlocking and automations need a Matter controller and Thread border router; Aqara's is the Hub M3 at $159.99. A house that already runs an Apple home hub such as a HomePod mini or the current Apple TV 4K with Ethernet (third generation) has both; Aqara's manual says other Apple TV models need a separate Thread border router. A house that does not pays $329.98 to keep the old lock, against $301.99 for Schlage's Encode Plus at Lowe's on 2026-10-09, a lock that replaces the hardware and needs no hub.
Our verdict
Buy the $169.99 U200 when you are keeping a single-cylinder deadbolt and already have your own Thread border router and a Matter controller; the retrofit's case weakens at $329.98 if Aqara's $159.99 M3 hub is also required.
- A good fit for
- A renter or owner keeping a single-cylinder deadbolt with a 2-3/8 or 2-3/4 in backset who has their own Thread border router and Matter controller, and wants fingerprint or Apple home key entry.
- We would skip it if
- You would also have to buy the $159.99 Aqara M3 hub, the inside of the door is a key that fails Aqara's size check, or you want a lifetime mechanical warranty.
Reasons to consider it
- Keeps the existing deadbolt, exterior cylinder and key, and needs no drilling or door modification; the inside thumb turn is replaced by a motorized knob.
- Fingerprints, keypad codes and Quiet Unlock work at the door with no hub or Thread border router; Apple home keys need an Apple home hub such as a HomePod mini, which is also the Thread border router.
- Aqara's US listing puts Black and Silver at the same $169.99 and includes the rechargeable pack, five cylinder adapters, a hex driver, four AAA cells, a 3M sticker and the power-bank pouch.
The compromises
- Remote unlocking, away-from-home guest codes and cross-device automations need a Matter controller and Thread border router; Aqara's own hub adds $159.99, taking the retrofit to $329.98.
- The warranty is 12 months on the whole lock, against Schlage's limited lifetime mechanical and finish plus three years on electronics for the Encode Plus.
- Fit depends on the existing cylinder: a tailpiece that protrudes 1 to 20 mm, a key inside that is no more than 5 mm thick and 39 mm long, and adapters Aqara says may need replacing after about two years.
What we have not verified: Aqara publishes no door-thickness range and no limit on the turning force the U200 can apply, so there is no figure to check a stiff or non-standard existing deadbolt against before ordering; a bolt the motor cannot fully throw would change the recommendation.
The things in this guide
A closer look at the products, who they may suit, and what to check before buying.
Smart Lock U200
It keeps the existing single-cylinder deadbolt, exterior cylinder and key, and adds fingerprint, keypad, Apple home key and NFC entry plus Matter over Thread, with the rechargeable pack and five adapters in the box.
Before you buy: A Matter controller and Thread border router are required for remote unlocking and automations; Aqara's own hub adds $159.99, the adapters may need replacing after about two years, and the warranty runs 12 months.
Price checked October 9, 2026. Retailer prices can change.What $169.99 actually replaces, and what stays
The U200 is two pieces. The inside is a motorized unit with a knob that grips the existing cylinder's tailpiece and turns it; the outside is a separate battery keypad that talks to the lock and can sit up to about 2 meters away. Because the exterior cylinder is untouched, the original key still opens the door, and Aqara's manual says no drilling or door modification is needed. The box holds five cylinder adapters, a hex driver, the rechargeable pack, four AAA cells, a 3M sticker and the power-bank pouch; NFC entry needs the separately sold $9.99 NFC Card.
Aqara lists the retrofit for single-cylinder US deadbolts only, at backsets of 2-3/8 in (60 mm) or 2-3/4 in (70 mm), and calls for a PH1 Phillips screwdriver. The inside body measures 2.4 by 2.4 by 6 in (62.3 by 60.6 by 152.5 mm) and the keypad 1.7 by 1.3 by 5.7 in (42.7 by 33 by 146 mm). Aqara publishes no door-thickness range, unlike Schlage, whose Encode Plus page gives 1-3/8 to 1-3/4 in.
The $159.99 hub decides whether the retrofit is cheap
Aqara's own spec table answers 'Hub Required? Yes,' and Aqara calls the U200 'exclusively compatible with the Aqara M3 hub for optimal performance,' which the company sells at $159.99. The manual is narrower: smart automations and related functions need a 2-in-1 Matter Controller and Thread Border Router, Apple Home needs an Apple home hub such as a HomePod mini or the current Ethernet model of Apple TV 4K, and some Aqara Home features work without a hub within Bluetooth range.
That distinction sets the total. Fingerprints, keypad codes and Quiet Unlock run at the door with nothing else bought, while Apple home keys need an Apple home hub, which is itself the Thread border router and Matter controller; remote unlocking, away-from-home guest codes and cross-device automations need a controller and border router in the house. With Aqara's $159.99 M3 hub, $169.99 plus $159.99 is $329.98: 98 cents over Schlage's $329 MSRP for the Encode Plus, and $27.99 over the $301.99 Lowe's asked for it on 2026-10-09.
Four checks decide whether it fits at all
Backset is the first: 2-3/8 or 2-3/4 in, and single-cylinder only. The second is the tailpiece, the bar the thumb turn gripped. Aqara says it must protrude 1 to 20 mm past the fixed plate and may need trimming above 20 mm. Nothing Aqara publishes sets a maximum turning force, so a stiff old bolt is an unknown rather than a yes.
The third check is the mounting method: if the cylinder protrudes 3 mm or more from the interior cover, Aqara uses screws; at 3 mm or less it uses the included 3M adhesive or asks you to replace the cylinder. The fourth applies only where the inside is a key rather than a thumb turn: that key must be 5 mm thick or less and its handle 39 mm or less, and the outside must still unlock with the inside key inserted.
Two battery sets, one wired option, six months claimed
The inside unit runs on an included Aqara rechargeable Li-ion pack rated up to six months at about eight fingerprint or NFC unlocks a day. The power-bank pouch hangs on the door handle so the lock can charge while it works. The keypad takes four LR3 AAA cells, or a 12V-24V 0.5A AC/DC supply wired in by an electrician; Aqara presents that as a professional job rather than a plug-in adapter.
Aqara rates the keypad IPX5 and the lock for 5 F to 150.8 F, which covers most US entry doors, though the water rating applies to the keypad only. The adapters are the wear item: Aqara's manual lists them as consumables that may need replacing after about two years, with new ones sold separately or 3D-printable at the owner's risk.
Twelve months of cover and no security grade on the page
Aqara's warranty page gives every smart door lock 12 months, counts the clock from delivery, is not transferable, and covers locks bought on us.aqara.com; shipping for a repair is covered inside the USA. That single term covers the electronics and the mechanism that turns the cylinder alike.
Schlage's Encode Plus page claims limited lifetime coverage on the mechanical parts and finish plus three years on electronics, and ANSI/BHMA A156.40-2015 Grade AAA in security, durability and finish. Aqara's U200 listing and manual make no ANSI/BHMA grade claim. That does not show the retrofit is weaker, but it leaves a buyer with no published grade to weigh against the lock being kept.
When a whole deadbolt is the better buy
Skip the U200 if you would also have to buy the $159.99 M3 hub and no other Thread border router is in the house: $329.98 to keep your current lock is $27.99 more than the $301.99 Lowe's charged on 2026-10-09 for Schlage's Encode Plus, a replacement that carries 100 codes, a built-in alarm and no hub at all.
Skip the U200 as well if the inside is a key that fails Aqara's 5 mm and 39 mm check, if the cylinder gives less than 3 mm of protrusion and you do not want adhesive, if the deadbolt is stiff enough that you doubt a small motor can throw it, or if a lifetime mechanical warranty matters more than keeping the original key.
How we put this together
Built from the product pages and listings below, without test scores or results we have not measured. Specifications and prices change, so check the original page for the exact model, current price, delivery, and returns.
- Aqara: Smart Lock U200 product listing (opens in a new tab)
- Aqara: Smart Lock U200 User Manual (PDF) (opens in a new tab)
- Aqara: Hub M3 product listing (opens in a new tab)
- Aqara: limited warranty policy (opens in a new tab)
- Schlage: Encode Plus Smart WiFi Deadbolt with Century Trim product page (opens in a new tab)
- Aqara: NFC Card product listing (opens in a new tab)
- Aqara: Smart Lock U200 Help Center page (opens in a new tab)
- Lowe's: Schlage Encode Plus Smart Wi-Fi Deadbolt, Century Satin Nickel (BE499WB V CEN 619) (opens in a new tab)
