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The one everybody reads first.
If you take one thing away before you buy, make it this.
Will a smart lock fit my door? A 60-second guide
Before anything else, this. A plain-English walk through door thickness, uPVC versus composite, and multipoint locks — so you know for certain before you order.
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More guides on the way.
We're writing the next few now — fitting, renting keyless, and what the specs really mean. In the meantime, the guide above answers the question most people ask first.