How to Choose the Right Mortise Handle for Your Door

Start With Your Door, Not the Handle

The single most common mistake buyers make is choosing a handle they like the look of, then discovering it doesn't fit their door. A mortise handle isn't a surface-mount product — it sits inside a pocket (the "mortise") cut into the door edge, so the door itself dictates what will work.

Door Thickness Matters

Most standard interior doors in India are 30–35 mm thick. If your door is thinner or thicker than this, not every mortise handle will fit. Check the manufacturer's spec sheet for the compatible door thickness range before ordering. At Dorbell, our mortise handles are designed for the 30–45 mm range that covers the vast majority of residential and commercial Indian doors.

Understanding Backset Distance

The backset is the distance from the edge of the door to the centre of the keyhole. In India, the two standard backset sizes are 50 mm and 60 mm. If you're replacing an existing lock, measure the current backset — switching sizes means drilling a new pocket, which most people want to avoid. For new installations, 60 mm is the more common choice for residential doors.

Choosing a Finish That Lasts

Finish isn't just cosmetic — it determines how the handle ages. Brass develops a natural patina over time (some people love this; others don't). SS304 stainless steel stays consistent and resists corrosion, making it the go-to for coastal areas or high-humidity environments. Antique finishes offer a classic look but may require more maintenance. For a detailed breakdown, read our guide on material and finish comparisons.

Lever vs. Knob: Practical Differences

Lever handles are easier to operate — you push down rather than grip and turn, which matters for elderly family members or anyone carrying things. Knob handles have a more traditional appearance and a smaller visual footprint. In commercial settings, lever handles are increasingly preferred (and in some markets, required by accessibility codes).