DP and I are looking to buy a house and start a family. I'm not sure whether it's a better idea to buy a smaller house and move when we need more space, or something bigger so we can stay put, but not use all the space in the immediate future? I can't imagine we'll need more than 2 bedrooms in the next few years i.e. one for us and one for a child - but maybe in 10-15 years we might have multiple teenagers and then need 3 or 4 bedrooms? Moving is a hassle and we are lucky enough to be able to afford a bigger house now - but would it be a waste to buy a bigger house with 1-2 bedrooms sitting empty, especially when we'll be paying more in mortgage interest? It seems a bit silly to plan for multiple hypothetical children at this point. Would love to hear everyone's thoughts and experiences...