The 2020 model codes offer a progressive series of performance-based steps, like those of the BC Energy Step Code. Starting with a familiar base building code and moving upwards through the tiers, the energy used to operate the building is incrementally reduced. Consequently, the energy performance of the building increases with each tier.
At the highest tier, the 2020 model codes are intended to achieve net-zero energy-ready (NZEr) levels of performance. NZEr buildings are expected to be 80% more energy efficient than a building constructed to today's code minimum, but do not yet have on or off-site renewable energy systems in place.

In the fall of 2021, a commitment in the Liberal Party platform set out to achieve a net-zero emissions building code for 2025 adoption. As a result, the federal government will need to provide unique performance standards that prioritize zero-carbon or (zero-carbon ready) heating and hot water systems, as well as zero emissions from construction materials, referred to as embodied carbon.

This net-zero emissions code must still be developed. In the meantime, the 2020 model codes are expected to be released by the end of 2021 and provide a pathway to a net-zero emissions building code. But first, the 2020 model codes must be swiftly adopted at the highest performance tier achievable, and all new buildings constructed in full compliance with all energy code requirements."