Hello, We are building a new house and are almost ready for paint. Our contract with our builder is for flat paint in the entire house. With three kids I want to switch to a washable flat or an eggshell. Our builder asked the painters what the cost would be to switch. The painter said it would be a $175 per room upcharge. The painter gave two reasons: the eggshell would need a third coat (the flat would only need two coats)and the eggshell is a more expensive paint than flat. Does that sounds reasonable? I have painted with eggshell before and have never used three coats... this is in addition to the drywall primer they will spray on first. I know the eggshell is a little more expensive, but only $5-$7 per gallon, probably less than that with the painter's discount. Thanks for any advice!