Yes. As long as the cohabitation agreement is properly drafted by way of deed, signed voluntarily of free will and both partners have at least been advised to take independent legal advice, it can be enforced. That being said, it’s important to keep the agreement up-to-date as of when your circumstances change, as a cohabitation agreement can be overturned if it can be demonstrated that you and your partner have changed your intentions at a later point in time.