Here is the mistake thousands of buyers make: they choose a smart lock they love, then discover it will not fit their door. Smart lock door compatibility is the single most important thing to check before you buy — because the door’s material, thickness, mortise and hardware dimensions decide which locks will actually work. This complete guide for Indian homes walks you through every measurement and factor that matters, so your new lock fits perfectly the first time.
Can a smart lock fit any door?
Almost any door can take a smart lock — but not every smart lock fits every door. The trick to smart lock door compatibility is matching the lock’s requirements to your door’s specifications. Wooden, metal, uPVC and glass doors each have different needs, and mortise dimensions vary. Get the measurements right and installation is straightforward; skip them and you risk a lock that will not mount, a bolt that will not engage, or a return.
Compatibility by door material
Wooden doors
The most common and most compatible. Solid wood easily accepts a mortise smart lock. Just confirm thickness and that the stile (the vertical edge) is wide enough for the lock body.
Metal doors
Steel and metal doors work well but may need a compatible mortise cut and, sometimes, professional fitting. Confirm the lock supports metal-door installation and the required backset.
uPVC doors
Common in apartments. These use a narrow profile, so you need a slim-body lock designed for uPVC and the correct multipoint or single-point mortise.
Glass doors
Framed or frameless glass needs specialised locks (often patch-fitting or a dedicated glass-door model). A standard mortise lock will not fit frameless glass, so check for a specific glass-door variant.
Before buying a smart lock, check these 10 things
This is your smart lock door compatibility checklist — measure each before ordering:
- Door material — wood, metal, uPVC or glass.
- Door thickness — most smart locks fit roughly 40–100 mm; confirm your range.
- Opening direction / handing — left or right, inward or outward.
- Existing mortise size — e.g. 6068, 6072, 5050; matching it avoids re-cutting.
- Backset — distance from the door edge to the centre of the lock (commonly 60 mm).
- Centre distance — spacing between the handle spindle and the cylinder.
- Faceplate dimensions — the metal plate on the door edge must match the cut-out.
- Lock case dimensions — the body must fit inside the door stile.
- Handle position — ensure the new lever/handle clears the frame and wall.
- Emergency key requirement — confirm a mechanical keyhole is included.
Understanding mortise sizes (6068 and friends)
The mortise is the pocket cut into the door edge that houses the lock body. In India, 6068 is one of the most common mortise sizes for modern smart locks, alongside 6072 and 5050. The number encodes the mortise dimensions, and matching your door’s existing mortise (or cutting to the lock’s spec) is central to smart lock door compatibility. If your door already has a 6068 mortise, a 6068 smart lock drops in with minimal modification — one reason 6068 models are so popular for upgrades.
Renting or in an apartment?
Renters should prefer locks that fit the existing mortise and can be removed later, and should confirm changes with the landlord. Apartment uPVC doors need slim-profile models. Our apartment and rental smart lock guide covers this in detail.
Where Covlor fits in
Covlor® designs its Smart Door Locks around real Indian doors. Models such as the CR L45, CR L51, CR L88 and CR L99 are built for common configurations including the widely used 6068 mortise, fit a broad range of door thicknesses, and ship with a mechanical key backup. Because fit is critical, installation is supported through a growing authorised dealer network that can measure and fit correctly. Every lock is made to order and tested before shipping, backed by a 2-year warranty and a digital warranty card you can verify online. Browse the range in the Covlor store, and check specs against our buying guide.
Frequently asked questions
Can a smart lock be installed on any door?
Most doors can take a smart lock, but not every lock fits every door. Smart lock door compatibility depends on material, thickness, mortise size, backset and centre distance — measure these before buying.
What is a 6068 mortise smart lock?
6068 is a common mortise (lock-body pocket) size in India. A 6068 smart lock fits doors with a matching 6068 mortise, making upgrades easy with minimal re-cutting.
Can I put a smart lock on a glass or uPVC door?
Yes, but you need a model made for it — a glass-door variant for frameless glass, and a slim-profile lock for uPVC. A standard mortise lock will not fit these without the right version.
Check your door, then explore the Covlor Smart Door Lock range, and read next about the best smart lock access methods.
