I suspect most (if not all) of us are aware than renovation, expeiclaly in an older home, can result in some massive budget surprises. especially regarding electrical or plumbing systems requiring upgrade to code. But there are more possibilitties for hidden cost in home renovation than you may realize... which is whay any savvy contractor always includes a contingency in his estimate and why you should do the same in your budget.
But I bet you never thought of these five potentially hidden costs:
Prepare for these often unanticipated expenses  so you're not left wondering why your wallet has sprung a leak.