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While the August Smart Lock and competing brands are growing in popularity in the US, there are not many choices in the UK. This is mainly due to the different styles of door we have, in the UK and the rest of Europe, multi-point UPVC doors are the popular modern style.
For the past few years, Yale has been almost the only option available to us with their Conexis L1 being a connected door lock compatible with multi-point systems. They also have the Connected Smart Lock which replaces the older night latch style lock.
Recently a few new companies have popped up, one includes the Nuki Smart Lock, which is compatible with many lock styles