Generally speaking, expanding your kitchen or adding a bathroom can result in the highest return of investment by increasing the value of your home. A larger kitchen will also be a selling point should you choose to sell your home sometime in the future. Home offices and sunrooms can also offer a good ROI. Sunrooms are becoming an eco-friendly trend because they can provide direct gain of heat from the sun which in turn can lower heating bills. Although return on investment is important, the critical factor is your current need. If you plan to stay in your home for some time, the enjoyment of the room is the most important aspect of adding a room to your house.