What is the sixty-year rule?

The sixty-year rule is the informal name given to section 34 of the National Heritage Resources Act (NHRA) which states that ‘No person may alter or demolish any structure or part of a structure which is older than 60 years without a permit issued by the relevant provincial heritage resources authority’.

'Alter' is defined by the Act as ‘any action affecting the structure, appearance or physical properties of a place or object, whether by way of structural or other works, by painting, plastering or other decoration or any other means’.

Related question: How can I tell if my property is older than sixty years?