Start with Okotoks’s permit requirements
Open Okotoks building and suite permits ↗A similar home elsewhere in Calgary region is not evidence of entitlement in Okotoks; use the current local zoning and permit information.
Alberta: the provincial layer
Alberta’s building code has specific requirements for houses with secondary suites, while municipalities decide where suites are allowed through local land-use bylaws.
Alberta secondary-suite building code ↗What the Okotoks source actually tells you
Okotoks’s Building & Renovation Permits page contains a “Developing a Secondary Suite” section, including permit exemptions for certain internal suites and required safety-code permits. It is the appropriate source for construction/permit instructions; the separate secondary-suite and ADU grant page covers funding and is closed to new applications. Confirm the parcel’s zoning and any development-permit requirement with Planning Services.
For Okotoks, read the “Developing a Secondary Suite” subsection and its application checklist for project-specific permitting; detached/garage/garden units can require development permits. Do not substitute a neighbouring municipality’s numeric rule for anything the local source leaves open.