Buying a smart door lock is not like buying a phone or a pair of shoes. Get it right and you enjoy years of effortless, secure access. Get it wrong — the wrong size, the wrong lock type, a weak app — and you are left with an expensive gadget that does not fit your door or your life. This buying guide walks you through every factor that actually matters, in plain language, so you can shop with confidence and choose a lock you will be glad you bought.
Use it as a pre-purchase checklist. By the end you will know exactly which specifications to confirm before you pay, which features are worth the extra money, and which questions to ask any seller. Let us start with the single most important thing people overlook: whether the lock will physically fit your door.
1. Measure Your Door First
Before anything else, check your door thickness. Most smart locks are designed for doors between roughly 40mm and 55mm thick, though many offer adjustable fittings for a wider range. A lock that does not match your door will either fail to fit or feel loose and insecure. Measure the door’s thickness, note whether it opens inward or outward, and check whether it is left- or right-handed. These three numbers determine which locks are even an option for you.
2. Understand Lock Types: Mortise vs Rim vs Deadbolt
Smart locks come in several body styles. A mortise lock fits into a pocket cut into the edge of the door and is the standard for most Indian and European doors, offering strong security. A rim lock mounts on the surface, and a deadbolt replaces or supplements an existing bolt. Knowing which type your door is built for — the popular 6068 mortise size is common in India — ensures the lock integrates cleanly rather than requiring awkward modifications. If in doubt, a quick photo of your current lock body helps a seller confirm compatibility.
3. Check Fingerprint Sensor Quality
Since you will use the fingerprint reader every day, its quality is central to your satisfaction. Semiconductor and capacitive sensors are generally faster and more accurate than older optical readers, and they cope better with dry or slightly wet fingers. Ask about recognition speed (ideally under a second) and how many fingerprints the lock can store. A cheap sensor that misreads your finger every third try will sour the whole experience, no matter how good the rest of the lock is.
4. Decide If You Want an AI Camera
Higher-end smart locks include a built-in camera with AI face recognition, motion detection and even a video peephole. This lets the lock recognise approved faces, capture a snapshot of anyone lingering at the door, and give you a live view from your phone. If security and visitor monitoring are priorities, a camera-equipped model is worth the premium. If you want simplicity and lower cost, a solid fingerprint-and-app lock without a camera may suit you better. You can compare both styles across the Covlor® smart lock range.
5. Evaluate the Mobile App and Ecosystem
The app is where you will manage users, generate temporary codes and view entry logs, so its quality matters as much as the hardware. Look for a stable, well-reviewed app that supports remote unlocking and instant alerts. Check whether the lock works with the Tuya Smart platform, which connects it to a huge ecosystem of cameras, sensors and voice assistants. A lock tied to a mature platform like Tuya will keep gaining features and integrations long after you buy it.
6. Confirm Connectivity Options
Decide how connected you want your lock to be. Bluetooth-only locks are cheaper and let you unlock from nearby, but cannot be controlled when you are away. Wi-Fi (often via a bridge or built in) enables true remote access, alerts and integration. If you travel, manage guests, or want to check your door from work, prioritise Wi-Fi connectivity. If you only want keyless local entry, Bluetooth may be enough — but most buyers eventually wish they had chosen Wi-Fi.
7. Battery Life and Backup Power
Almost all smart locks run on rechargeable or replaceable batteries. Look for six to twelve months of life on a charge, clear low-battery warnings, and — crucially — an emergency power terminal (usually USB-C) so you can power the lock briefly if the battery dies. A physical key override is the final safety net. Together these ensure a dead battery is a minor inconvenience rather than a lockout. Never buy a lock without at least one emergency access method.
8. Warranty, Support and After-Sales
A lock is a long-term purchase and a critical part of your home, so buy from a brand that stands behind it. Check the warranty length, whether local support and installation help are available, and how easy it is to get spare parts or service. A well-supported lock from an established supplier — you can review the options at Covlor.de — is a far safer bet than an unbranded import with no service network, however cheap it appears.
Pre-Purchase Checklist
| Factor | What to Confirm |
|---|---|
| Door thickness | Lock supports your door (approx 40–55mm) |
| Lock type | Mortise / rim / deadbolt matches your door |
| Fingerprint sensor | Fast, accurate, multiple prints stored |
| AI camera | Needed for face unlock & monitoring? |
| Mobile app | Stable, Tuya-compatible, good reviews |
| Connectivity | Wi-Fi for remote access |
| Battery backup | Emergency power + physical key |
| Warranty | Length + local support available |
How Much Should You Spend?
Smart lock prices vary widely, and more expensive does not always mean better for your needs. A dependable fingerprint-and-app lock covers most homes well. Stepping up adds AI face recognition, a camera and richer app features. Rather than chasing the highest price or the lowest, decide which features from this guide you will actually use, then choose the best-supported lock in that band. That approach consistently delivers the best value.
Frequently Asked Questions
How do I know if a smart lock fits my door?
Measure your door thickness and identify the lock type it uses (often a mortise body in India). Match those to the lock’s specifications, or send a photo of your current lock to the seller to confirm.
Is Tuya compatibility important?
Yes, if you want your lock to integrate with cameras, sensors and voice assistants. Tuya is a widely supported platform that keeps adding features and devices.
What happens if the battery dies?
Quality locks warn you weeks in advance, offer emergency USB-C power, and include a physical key backup, so you are never locked out.
Where can I compare suitable models?
Learn more about premium smart door lock models at Covlor.de, where you can match features and door compatibility.
Ready to choose? Learn more about premium smart door lock models on Covlor.de and pick the lock that fits your door and your lifestyle.
