Canada’s federal mortgage insurance capital framework is changing on January 1, 2027, and one of the most concrete changes is a new distinction between smaller and larger multi unit residential construction projects.
OSFI’s final Mortgage Insurer Capital Adequacy Test for 2027 introduces a low rise multi unit residential construction category. For this purpose, OSFI describes a low rise project as one with fewer than 7 storeys and fewer than 200 units. Where the lender holds the senior lien and prudential underwriting standards are in place, the base risk weight for that category is 130%. High rise multi unit residential construction remains at 150%.
That difference matters because MICAT is part of the framework OSFI uses to assess whether federally regulated mortgage insurers hold enough capital for the risks they carry. A lower risk weight does not make a project easier to build by itself, and it does not guarantee a different premium or underwriting result. It does, however, change the capital calculation applied to qualifying insured exposure.
OSFI says the change is intended to make the framework more sensitive to the underlying risk of different types of residential construction. The regulator concluded that qualifying low rise projects justify a lower base weight than larger high rise projects. It also kept conditions around underwriting quality and lien position, which means the lower treatment isn’t available simply because a project falls below the height and unit thresholds.
There is another important qualification. OSFI’s guideline provides a 100% risk weight for certain low rise or high rise construction exposures where the lender has the senior lien, prudential underwriting standards are in place and the borrower has contributed equity equal to at least 25% of the property’s appraised completed value. That shows how the framework combines project type with financing structure rather than treating building size as the only risk signal.
For mortgage insurers, the change is directly operational. Capital planning, pricing models, portfolio analysis and reporting all need to reflect the 2027 framework. For lenders and developers, the effects will be less direct, but capital treatment can influence how insurance capacity is allocated and how different categories of development are assessed.
It’s also a useful example of what insurance regulation looks like away from claims disputes. Capital rules sit in the background of the market, but they shape how much risk an insurer can prudently carry. A targeted change in those rules can therefore matter to housing finance even though no policyholder will ever see MICAT wording in an insurance contract.