You may apply to sponsor a common-law partner, of the opposite sex or the same sex. If so, you have to prove you have been living with your partner for at least 12 consecutive months in a relationship like a marriage.
That means living together for one year without any long periods where you did not see each other. Either partner may have left the home for work or business travel, family obligations, and so on. However, that separation must have been temporary and short.
A common-law relationship ends when at least one partner does not intend to continue it.
Items that can be used as proof of a common-law relationship include:
a statutory declaration of a common-law union,
statements for shared bank accounts,
shared credit cards,
proof of shared ownership of residential property,
shared residential leases,
shared rental receipts,
bills for shared utilities accounts, such as
proof of shared management of household expenses,
evidence of shared purchases (especially of household items),
mail addressed to either or both of you at the same address,
important documents for both of you showing the same address, such as
driver’s licences and
insurance policies and
any other documents that show you have been living together.