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How can I legally and efficiently help my girlfriend build equity by helping with a mortgage?
I just wanted to give you a different perspective, as I own a house (purchased with a mortgage), with my girlfriend. I think it can be done safely and fairly, but you do need to involve legal help to do it right. There really is nothing to be terrified about, the extra cost to set this up was almost irrelevant in the bigger picture of legal costs around purchasing and the documents describing the ownership scheme are quite straightforward. Maybe it's a UK thing, but it seems rather commonplace here.  We've chosen to hold this as "tenants in common" and use a trust deed for this when we purchased. We had a solicitor write the trust deed and it clearly states what percentage of the house is owned by either party and exactly what the steps would be taken, should we decide to end the trust (e.g. in case of a split-up). This includes things like the right to buy out the other person before selling on the market etc.  We also had to make wills separately to indicate what should happen with our percentage of the property in case one of us died as with this type of ownership it doesn't automatically go to the other person.  Finally we're both on the mortgage, which I guess is the main difference versus your situation. But again, you could get legal advice as to how this should best be handled.