Mudrooms are not too expensive to remodel compared to other rooms of the house, but they can vary greatly depending on the scope of the remodel. If you are adding a new room that previously did not exist, you can expect additional expenses. However, for the average cost of a mudroom remodel, it is safe to say you might spend somewhere between $8,000 and $16,000. If you are adding a bump-out mudroom where you are adding space onto the house, you can expect to pay somewhere from $17,000 to $30,000 since this usually requires adding more to the foundation. While building a mudroom usually requires a decent investment, you should be able to recoup some or all of your money when it's time to sell. There are options for mudroom financing regardless of how much or how little you need to borrow.