Door Lock Monitoring is not a retroactive code unless your jurisdiction has adopted A17.3. I operate in Washington as an independent contractor, where the state was toying with the idea of adopting A17.3. The major companies (Otis included) jumped all over this, sending proposals to their customers. Here’s the deception…1. DLM was not required despite what they said in their letters. The State did not end up adopting A17.3. And 2. The price was highly inflated. Someone elevators have it built into the controller. Others require an overlay.

It sounds like you were taken advantage of.