Two taps and a tape measure
Will it fit my door?
Pick your door, then set how wide the flat face is where the lock goes. The locks that fit show up as you go.
Measure across the flat face of the stile where the lock goes, the strip marked in green.
mm
No tape measure? A bank card is 54mm across its short side. If the card just covers the face, you are close to 54.
This checks width only. The fixing kit for your door decides the rest, and your installer confirms it on site.
If your door is a ranchslider, a French door or anything with a narrow stile, our page on smart locks for aluminium joinery goes into more detail.