Which Smart Lock Fits Your Front Door, and Who Should Fit It

What the edge of the door says about the lock inside

The metal strip on the edge of a front door, where the bolts come out, tells you more than any shop listing. Look at that strip and at the inside face of the door around the keyhole, and you know which lock you have. Each kind takes a different family of smart lock.

In a tower, look and measure but leave the hardware in place for now. The entrance door there is usually a fire-rated assembly under the UAE Fire and Life Safety Code, its lock is one of the tested parts, and the fire-door section below covers what that means.

• A plate about the height of your hand with a latch and a bolt, and a cylinder whose face is a circle with a narrower tail below it, is a mortise lock with a euro-profile cylinder. The case sits in a pocket cut into the door; one screw in the edge plate holds the cylinder.
• A long strip down most of the door's height, with hooks or bolts at several points, is a multipoint lock, usually driven by a euro cylinder in the middle.
• A box screwed to the inside face, with a matching keep on the frame, is a rim lock.
• A knob or lever with a separate round deadbolt above it, each through its own drilled hole, is a bored lockset. Smart deadbolts are made for that door.

Then measure the door's thickness and the backset, the distance from the door edge to the centre of the keyhole. On a glazed or panelled door, measure the lock stile too: the solid strip of frame on the lock side. Note which way the door opens, and how far the cylinder stands proud of the handle plate on each side. None of this needs the cylinder out.

This article is for owners. If you rent, start with what a tenant may fit without consent, because a lock change needs the landlord's written approval.

Retrofit locks that turn the cylinder you already have

Retrofit locks (the Nuki, the Yale Linus and Aqara's U200 among them) are motor units mounted on the inside of the door over the existing euro cylinder. Nuki's manual says the unit sits on the cylinder "with the key inserted" and turns that key, which you can also turn by hand. The bolts, the lock case and the outside of the door stay as they are.

Fit comes down to the cylinder and the space around it:

• Nuki asks for a cylinder with an emergency function, which lets a key open the door from outside while another key sits in the inside. Without it, the key the smart lock holds blocks yours at the front door, and Nuki says the only fix is a new cylinder.
• Yale's Linus guide covers a cylinder standing at least 3 mm proud of the inside handle plate and sends you to its adjustable cylinder for anything shorter. Nuki takes a key up to 4 mm thick, protruding up to 37 mm.
• On an inward-opening door, Nuki needs the keyhole centre more than 30 mm from both the frame and the handle; on an outward-opening one, more than 40 mm from the frame.
• A thumb-turn on the inside has to go for a lock that turns a key, like Nuki's: the cylinder is swapped for a key-and-key one of the same length.

Nuki lists multipoint locks as supported. Its motor only turns the key, though, so on a door whose hooks engage when you lift the handle, you still lift it by hand.

On a villa door this is the do-it-yourself family. The mounting plate goes on with the cylinder's screws or an adhesive pad, and a cylinder swap is one retaining screw. Nuki rates its unit for dry interiors only, between 10°C and 40°C.

Push-pull and lever sets that replace the lock inside the door

The tall keypad-and-handle units, Samsung's push-pull range among them, replace the whole lock. Samsung's catalogue pairs them with its own mortise case, with a face plate 25 mm wide and about 110 mm tall for one deadbolt or 240 mm for two, on doors 40–60 mm or 60–80 mm thick depending on the installation kit. For its SHS-P717, an Australian distributor lists a 70 mm backset and a lock stile of at least 115 mm, and recommends professional installation.

If your current case is a different size or backset, the pocket has to be recut and new holes drilled for the spindles and the cable between the two halves. That is joinery on the door itself, the part to hand to a smart home and security installer: a pocket routed off-line leaves a door that binds or a bolt that will not throw.

Aluminium stiles, rim locks and doors that need new hardware first

A glazed aluminium door often has a frame too narrow for a 70 mm backset and 115 mm of stile. Slim-stile smart locks exist for it: ASSA ABLOY sells the Yale Unity Slim with a 30, 40, 50 or 60 mm backset for narrow timber or aluminium stiles. Matching the old backset keeps the existing holes usable. A mismatch means cutting the profile, which is a job for the installer or the door's fabricator.

A rim lock takes a surface-mounted smart lock; Samsung lists one for doors 40–60 mm thick. A door already bored for a deadbolt takes a smart deadbolt, which Samsung lists for doors 35–55 mm thick. Put a deadbolt model on a mortise-lock door, though, and you are drilling new holes through the leaf.

In a tower, the entrance door is part of the fire separation

The door between a flat and the corridor is usually built as a fire-rated door set under the UAE Fire and Life Safety Code, which Civil Defence enforces, with leaf, frame, seals and hardware approved together. Changing one part changes the tested assembly, which is also why an entrance door that drags or will not latch goes to building management.

One fire-tested electronic lock shows how narrow such an approval is. Warringtonfire's certificate for SimonsVoss electronic mortice locks covers timber door sets rated 30 or 60 minutes, tested to EN 1634-1, and requires intumescent sheet (a material that swells in fire) around the lock case. It caps the spindle hole through the leaf at 15 mm, excludes metal doors, and says that leaving out the protection invalidates it.

None of the fitting guides consulted for the retrofit locks above mentions fire testing, and Nuki's safety instructions say: "Do not install the Nuki Smart Lock Pro on fire doors, escape doors or all doors that serve a safety-relevant purpose." That rules a Nuki out on a fire door whatever the building says, and any other clip-on lock, though it drills nothing, still needs the building's agreement on this door.

So write to building management before you buy. Under Dubai's Law No. 6 of 2019 a RERA-registered management company runs a jointly owned building's common parts, and whether your entrance door is part of your unit or of the building's fire protection depends on that building's documents. Ask the managing agent:

• whether the door is a certified fire door, and what its certificate or label says;
• whether any smart lock is approved for it, and whether the cylinder may be changed;
• who may fit it: the building's door contractor, or an installer you book;
• whether the change needs written approval or a fire consultant's sign-off.

Flat batteries, summer heat and the key you keep

Samsung's push-pull locks take eight AA batteries, about 10 months at ten uses a day by the catalogue, and warn when they run low. If they die anyway, the DP609 takes a power bank on a micro-USB socket outside, another model a 9 V battery held to an external terminal, and the push-pull models carry a mechanical override key. From inside, they open with a push on the handle.

A retrofit lock leaves the original key working from outside. Nuki's manual says to carry the key or keep it within reach "so that the door can be opened manually in the event of an error", which means a second key kept with you, since the first sits in the cylinder.

Heat matters most for the part outside. The National Centre of Meteorology puts average August daytime highs across the UAE at about 41–43°C in the shade. Samsung rates its locks to 55°C, and a keypad in afternoon sun runs hotter than the air, so on a west-facing villa door ask whether a canopy shades it. Inside, an air-conditioned hall sits well within Nuki's 40°C ceiling; a villa left shut with the AC off over summer may not. Many Samsung models also carry a high-temperature alarm that unlocks the door so you can get out in a fire.

Codes for visitors, and what still works with the router off

A PIN, a fingerprint, a key tag or the key is checked at the lock itself. What needs a connection is anything done from away: remote unlocking, alerts, changing a code from the office. Nuki's manual says that when Wi-Fi drops, the remote functions are unavailable.

Bluetooth works with your phone near the door. Wi-Fi is built in on some models (Yale lists it for the Linus L2; Nuki's Pro uses the 2.4 GHz band only) and is an add-on module on others, such as the IoT service pack Samsung sells for the DP609. Thread, the radio behind many Matter devices, needs a hub or border router; Aqara's U200 uses it. On a villa, if your phone shows one bar or none at the front door, fixing the villa's Wi-Fi dead zones comes first.

For a cleaner, a courier or a guest, look for a PIN that works only in set hours, a one-time PIN and an access log. Samsung's catalogue lists all three.

Then check the model on the TDRA's approved equipment list, searchable by model name. Radio equipment has to be registered with the TDRA before it is sold in the UAE. Personal imports are exempt, but Samsung's catalogue warns that its app service may not be offered in some countries, so confirm the app works here before ordering from abroad.

Which lock fits which door, and who fits it

• A villa door with a euro cylinder that has the emergency function (or one you will swap), and a keyhole clear of frame and handle: a retrofit lock, fitted yourself.
• The same door, if you want a keypad outside and one-push exit inside, 40–80 mm thick with a wide enough stile: a push-pull mortise set, fitted by an installer.
• A glazed aluminium door: a slim-stile lock at your existing backset, fitted by an installer or the fabricator.
• A rim lock, or a door already bored for a deadbolt: a smart lock made for that lock, a screwdriver job where the holes line up.
• A solid door over 80 mm, or a stile too narrow for any case: new lock hardware before any smart lock.
• A tower entrance door: nothing until building management answers in writing, then only an approved lock, fitted by whoever they name.

For the installer cases, the Security Systems service on Everlook lists licensed installers with verified credentials and reviews. Send two or three your door thickness, backset, stile width and a photo of the lock edge, then pick on how fast they reply, what their reviews say about door work, and the quote.

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