We are thinking of extending our house to get a new and much larger kitchen. The work will add some value but as much as we can tell, not as much as we will spend (maybe up to 20 grand less). We can't afford to move as the extension work will cost about as much as the moving costs and to get what we want in our area (where we want to stay for kids school etc) would take much more than we can actually borrow. We can easily afford the repayments and the new kitchen would be great, but there will also be some compromises in it. One day we may inherit money but there's no banking on that and although my OH's dad is elderly, his dad's mum lived till 99 (so he might be more likely to himself). Plus, I don't like to base big decisions on such morbid and grabby thinking. Would it be unreasonable to spend so much knowing we can't ever re-coop it?