One of the most important questions to ask deck builders Iowa City homeowners should be aware of is will there be any extra charges. Sometimes when you receive an estimate for constructing a deck, instead of a quotation, the contractor may add extra charges that may or may not have been confirmed by you first. If you have already committed to the deck project with a particular deck company, it may be more difficult to contest any additional charges along the way. The way to make sure you will not be charged any extra charges is to make sure you get a quotation in writing that includes the total amount for the final bill.