Best Smart Lock for a Door with a Euro Profile Cylinder: 5 Picks That Fit Without Replacing the Door

A door with a euro profile cylinder does not need a new lock body to go keyless — it needs the right retrofit. This guide covers five locks that work with that cylinder format or with the deadbolt hardware already on the door, from a budget cylinder swap to a Matter-ready system with a keypad in the box. Renters who cannot drill, homeowners who want app control, and buyers who just want a fingerprint reader on the front door all have a clear pick below. The overview table comes first so a decision can be made in under a minute.

The Picks at a Glance

Product	Key Spec	Best Use	Price Tier
Nuki Smart Lock Ultra (Euro Profile)	Euro profile retrofit, includes security cylinder, Matter/WiFi/Bluetooth	Full keyless conversion of a euro cylinder door	Premium
Smart Door Lock Euro Cylinder (Silver)	Retrofit electronic cylinder, wooden and iron doors	Cheapest way to try a smart cylinder	Budget
Smart Door Lock Euro Cylinder (Silver, 70mm)	Same cylinder, 70mm size option	Doors that need the longer cylinder body	Budget
Nuki Smart Lock (Deadbolt) & Keypad 2	Deadbolt system with keypad, fingerprint and code access	Households that want code and fingerprint entry	Mid-range
eufy Security Smart Lock C220	Built-in WiFi, fingerprint, IP53, BHMA Grade 3	High-traffic front doors on a mid budget	Mid-range

1. Nuki Smart Lock Ultra (Euro Profile) — Best Overall

Type: Euro profile retrofit smart lock
Connectivity: Matter, WiFi, Bluetooth
Included: Security cylinder
Key Features: Keyless entry, Auto-Unlock, remote access
Installation: DIY

Nuki Smart Lock Ultra (Euro Profile)

This is the pick that solves the euro cylinder problem at the source: the box includes a replacement security cylinder, so the smart mechanism and the physical lock are matched from the start. Matter, WiFi and Bluetooth are all built in, which means remote access and smart-home integration work without an extra bridge. Auto-Unlock handles the approach-and-enter case, and the retrofit design keeps the existing door hardware in place.

It earns the top spot because it is the only pick here that covers the cylinder, the radio protocols and the app in one purchase. The trade-off is the premium price tier — buyers paying for Matter and an included cylinder are paying for convenience and future-proofing, not for a budget entry point.

Trade-off: The premium price makes this a poor fit for a secondary door or a rental where the cylinder swap is not permitted.

2. Smart Door Lock Euro Cylinder (Silver) — Best Budget Cylinder

Type: Electronic euro cylinder lock
Door Compatibility: Wooden and iron security doors
Finish: Silver
Access: Electronic cylinder
Price Tier: Budget

Smart Door Lock Euro Cylinder (Silver)

This is the simplest possible route into a smart euro cylinder: a replacement electronic cylinder that drops into doors built for the format, including wooden and iron security doors. There is no separate keypad or bridge to mount, and the silver finish keeps it visually close to standard hardware. For a first smart lock or a low-traffic back door, the concept is exactly right.

It sits at the budget tier, and that shows in what is not promised. Buyers who want remote access, Matter integration or a fingerprint reader should look at the Nuki picks instead. This one is about turning a key into a code or app entry at the lowest possible cost.

Trade-off: The budget build and limited feature set suit a secondary door better than a main entrance where remote access matters.

3. Smart Door Lock Euro Cylinder (Silver, 70mm) — Best for Longer Cylinder Bodies

Type: Electronic euro cylinder lock
Size: 70mm
Door Compatibility: Wooden and iron security doors
Finish: Silver
Price Tier: Budget

Smart Door Lock Euro Cylinder (Silver, 70mm)

This is the same budget electronic cylinder as the pick above, offered in a 70mm size. That matters because euro cylinders are not one-size: door thickness and the lock body behind it decide which length fits, and a cylinder that is too short or too long will not sit correctly. Buyers who already know their door needs the longer body get a direct match here.

The reasoning is identical to the standard version — low cost, simple installation, no smart-home extras. It is included separately because buying the wrong length is the most common way a euro cylinder retrofit fails, and having the 70mm option listed makes the choice explicit.

Trade-off: The 70mm size only helps buyers whose door actually takes that length; measuring before ordering is essential, and the feature set stays basic.

4. Nuki Smart Lock (Deadbolt) & Keypad 2 — Best for Code and Fingerprint Entry

Type: Deadbolt smart lock with keypad
Access Methods: Fingerprint, code, app
Key Features: Auto-Lock, easy setup
Voice Control: Alexa, Google
Price Tier: Mid-range

Nuki Smart Lock (Deadbolt) & Keypad 2

This bundle pairs a deadbolt smart lock with the Keypad 2, which adds fingerprint and code entry alongside app control. Auto-Lock closes the door behind the household without anyone reaching for a phone, and Alexa and Google compatibility slots it into an existing smart home. Setup is pitched as straightforward, and the keypad means guests and family can get in without sharing app access.

It fits doors where the deadbolt hardware is being replaced rather than the euro cylinder, so buyers should confirm which route their door takes before choosing between this and the Ultra. The mid-range price reflects the extra keypad in the box rather than premium radio protocols.

Trade-off: This is a deadbolt system, not a euro cylinder retrofit — doors that must keep their existing cylinder should look at the Ultra instead.

5. eufy Security Smart Lock C220 — Best for High-Traffic Front Doors

Type: Deadbolt smart lock
Connectivity: Built-in WiFi, app remote control
Battery: Up to 8 months
Rating: IP53 waterproof, BHMA Grade 3
Access: Fingerprint keyless entry
Price Tier: Mid-range

eufy Security Smart Lock C220

Built-in WiFi means remote control and status checks without a separate hub, and the fingerprint reader handles the everyday unlock. IP53 waterproofing and BHMA Grade 3 are the details that matter on an exterior front door: the first covers rain and splashes, the second speaks to the hardware’s durability grade. Battery life is rated up to eight months, which keeps recharging off the weekly chore list.

It is the most popular pick in this set, and the combination of WiFi, fingerprint and weather resistance explains why. The catch is the same as the Nuki deadbolt: this replaces deadbolt hardware, so a door that has to keep its euro profile cylinder is not the right match.

Trade-off: The eight-month battery figure assumes typical use, and heavy fingerprint traffic or frequent remote access will shorten the interval between charges.

Before You Buy

• Cylinder vs. deadbolt: Confirm whether the door uses a euro profile cylinder or a deadbolt. The two budget cylinders and the Nuki Ultra are cylinder retrofits; the Nuki deadbolt bundle and the eufy C220 replace deadbolt hardware.
• Size: Euro cylinders come in different lengths, and the 70mm option exists for a reason. Measure the existing cylinder before ordering.
• Door material: The budget cylinders are listed for wooden and iron security doors. Check the door’s construction before assuming a fit.
• Connectivity: Matter, WiFi and Bluetooth are not universal across this list. Buyers who want remote access without a bridge should check the spec line first.
• Power: Battery life varies widely between models, and a fingerprint reader used all day draws more than app-only entry.
• Weather exposure: Only the eufy C220 carries an IP rating here. An exposed front door needs that protection; an internal or sheltered door does not.
• Included hardware: The Nuki Ultra ships with a security cylinder, and the Nuki deadbolt bundle ships with a keypad. Factor in what is already in the box before comparing tiers.

Frequently Asked Questions

1. What is a euro profile cylinder, and why does it matter for a smart lock?
   It is the standard cylinder shape used on many European and UK-style doors. A retrofit smart cylinder replaces that part directly, so the door and its handles stay as they are.

2. Can any smart lock fit a euro profile cylinder door?
   No. Only locks designed as cylinder retrofits work that way. Deadbolt smart locks require replacing the deadbolt hardware instead.

3. Is the Nuki Ultra worth the premium over the budget cylinders?
   For a main entrance where remote access, Matter and an included security cylinder matter, yes. For a back door or a first experiment, the budget cylinders cover the basics at a fraction of the cost.

4. How do buyers know which cylinder length to order?
   Measure the existing cylinder and match it to the listed size. The 70mm option exists precisely because a standard length does not fit every door.

5. Do these locks work with Alexa and Google?
   The Nuki deadbolt bundle lists Alexa and Google compatibility. The budget cylinders and the eufy C220 do not advertise voice control, so buyers who want it should start with the Nuki bundle.

6. What happens when the battery runs out?
   Battery life ranges from months to most of a year depending on the model and how often the fingerprint reader is used. A key or app fallback should be confirmed before relying on any smart lock as the only entry.

Bottom Line

For a door with a euro profile cylinder, the Nuki Smart Lock Ultra (Euro Profile) is the pick that solves the whole problem at once — cylinder included, Matter and WiFi built in, and no bridge required. Buyers on a tight budget who just want to try a smart cylinder should start with the standard or 70mm budget option, and households that prefer code and fingerprint entry over cylinder retrofits should look at the Nuki deadbolt bundle or the eufy C220.