If your thinking about adding a basement suite, or have one and you want to apply to have it made legal.
This link will be very helpful
In regard to attached or semi-detached dwellings there has been a couple of helpful changes brought forward by the City. Links are here;
This Bylaw change is #76P2019 regarding attached and semi-detached dwellings link;
RE: Extension to the June 2020 deadline. My contact at P&D City of Calgary tells me No extensions have been made official, Amnesty period for secondary suites deadline remains June 2020. If this changes I'll post it here.