Heavy-Duty Mortise Digital Locks for Landed Homes

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Landed homes usually have larger, heavier main doors than flats, so we recommend a heavy-duty mortise lock with more than one deadbolt. These are the mortise locks we recommend for terrace, semi-detached and bungalow main doors.

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7 products

Buying guide Top picks and how to choose

Landed Home Digital Locks: quick picks

Model Bolts Features From
Mercury X6 3 deadbolts + 1 double bolt Face and palm vein, built-in door viewer, fully automatic locking $849
Mercury V6 3 deadbolts + 1 double bolt Face and palm vein, night vision camera, dual battery $849
Mercury X5 3 deadbolts + 1 double bolt Face and palm vein, door viewer, at a lower price $699
Mercury X2 3 deadbolts + 1 double bolt Fingerprint, PIN and card, no app needed $549
Aqara D100 3 main bolts + master bolt + door bolt Fully automatic locking, fingerprint, Apple Home Key $848
Aqara A100 3 main bolts + master bolt + door bolt Semi-automatic: lift the handle to lock the bolts, Apple Home Key $648
Aqara D200i Mortise 3D face recognition, fully automatic locking, Apple Home Key $1,059

The Interlock Assurance

More Than Just Buying a Digital Lock

We help make sure the lock is suitable for your entrance, properly installed, and supported after installation.

No-Fit, No-Fee Before Installation

We check compatibility before installation. If the planned lock cannot be properly installed onsite and we cannot provide a suitable compatible alternative, you will not be charged for the unsuccessful installation.

30-Day Workmanship Guarantee After Installation

If an issue is confirmed to have been caused by our installation workmanship within 30 days, we will return and rectify the workmanship issue without an additional workmanship charge.

Product warranty coverage varies by product and brand. Please refer to the individual product page for the applicable warranty.

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Why Landed Home Digital Locks?

A landed home main door is usually taller, wider and heavier than a flat's, and it takes more force when it is pushed or pried. That is why we recommend a mortise lock with several bolts rather than a single deadbolt.

Why bolt count matters

A deadbolt is the bar that slides from the lock into the door frame. One deadbolt holds the door at one point. Several deadbolts spread the load along the frame. Mercury mortise locks, from the Mercury X6 to the Mercury X2, use 3 deadbolts plus a double bolt. Many Korean mortise locks use a single deadbolt with a latch and sensor. The Aqara D100 and Aqara A100 use multi-point locking: a door bolt, 3 main bolts and a master bolt that engage together.

Fully automatic or semi-automatic locking

On a fully automatic lock, the latch and every bolt lock by themselves as soon as the door closes. The Mercury locks, Aqara D100 and Aqara D200i work this way. The Aqara A100 is semi-automatic: the latch locks on its own, but you lift the handle to throw the bolts.

The double bolt: peace of mind at night

When everyone is home for the night, turn on the double bolt from inside. While it is on, no one outside can unlock the door electronically: not by PIN, card, fingerprint, face or app. From inside, the door still opens as normal.

Doors this suits

Solid timber doors, wide doors and tall doors. The Mercury V6 suits doors from 40mm to 120mm thick, which covers most thick landed doors. Send us photos first and we will confirm the fit.

Smart or simple

  • Face and palm vein: the Mercury X6, V6 and X5 unlock hands-free and give you an app for alerts and access.
  • Apple Home: the Aqara D100, A100 and D200i support Apple Home Key.
  • No app: the Mercury X2 works fully offline with fingerprint, PIN, card and key.

Side and back doors

Landed homes have more than one way in. For glass back doors, see our glass door digital locks. For sliding doors, see sliding door digital locks.

Mortise or rim?

Still deciding between lock types? Our guide to mortise vs rim vs deadbolt locks explains the difference.

Free fit check

Send photos of your main door on WhatsApp and we will recommend the right mortise lock for its size. Installation is free, by our own team.

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FAQ for Landed Home Digital Locks

Q1. How many bolts does a Mercury mortise lock have?

Mercury mortise locks, including the X6, V6, X5 and X2, have 3 deadbolts plus 1 double bolt, which works as a latch bolt with a sensor. Many Korean mortise locks have a single deadbolt with a latch and sensor.

Q2. What is a double bolt on a digital lock?

It is an extra bolt you turn on from inside. While it is on, no one outside can unlock the door electronically, whether by PIN, card, fingerprint, face or app. It gives you peace of mind at night when the whole family is home.

Q3. Will a mortise digital lock fit my heavy or extra-wide landed door?

Most solid timber landed doors are a good fit for a mortise lock. The Mercury V6 suits doors from 40mm to 120mm thick. Send us photos of your door and we will confirm the fit before you buy.

Q4. Can I manage more than one door from one app?

Yes. Mercury app locks all run in the same Tuya Smart app, and Aqara locks run together in the Aqara Home app, so you can manage a front door and a back door from one place. The Mercury X2 is offline and has no app.

Q5. Can I still use a key?

Yes. Every lock in this collection has a mechanical key backup.

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