Common-law partner sponsorship is for couples who are not married but have lived together in a committed, marriage-like relationship for 12 consecutive months (short, temporary absences are allowed). To qualify, you must prove a full year of continuous cohabitation before applying—this is especially important for outland cases—and inland applicants generally must be living in Canada with valid temporary status (unless exempt under a public policy).
Because common-law couples don’t have a marriage certificate, IRCC expects strong evidence of shared residence and an interdependent life (for example, joint leases/bills, shared finances, and consistent proof of living together). Processing is typically around 12 months, and the sponsor signs a 3-year undertaking once the partner becomes a permanent resident.