In Nova Scotia, a builder’s lien that is registered against a property only stays valid for 105 days past the last day of work done on the property unless the lien is “perfected”. “Perfection” in the context of a builder’s lien means that the person who holds the lien formalizes their claim by starting a lawsuit in the Supreme Court of Nova Scotia. If no lawsuit is started within the required time, the lien becomes completely invalid.