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Should I invest in my house, when it's in my wife's name?
The best answer to this question will depend on you and your wife. What is 'fair' for some may not be 'fair' for others. Some couples split expenses 50:50. Some split proportionately based on income. Some pool everything together. What works best for you will depend on your relative incomes, your financial goals, living standards, and most importantly, your personal beliefs. Here is a great question with various viewpoints: How to organize bank accounts with wife. It doesn't touch heavily on home ownership / pre-nuptial agreements, but might be a good starting point to getting you to think about your options. Consider providing another loan to your wife for additional investments in the home. It seems you are both comfortable with the realities of the pre-nuptial agreement; one of those realities seems to be that in the event of divorce you would lose access to the house. Loaning money has the benefit of allowing for the improvements to be done immediately, while clearly delineating what you have spent on the home from what she has spent on the home. However, this may not be 'fair', depending on how you both define the term. Have you discussed how expenses and savings would be split between you? Since there is no mortgage on the house, she has effectively contributed her pre-marital assets towards paying substantially all of your housing costs. It may be 'fair' for you to contribute to housing costs by at least splitting maintenance 50:50, or it may not be. Hopefully you talked about finances before you got married, and if not, now would be the best time to start. I personally would hate to have an 'uneasy' feeling about a relationship because I failed to openly communicate about finances.