I think your builder is stalling. If you haven't done so already, take about 15 minutes and get a pen and paper and write down dates and times and people's names and the 'nature' of your conversation regarding problems with your new house. IF it comes to a 'dispute', you'll need to show the Judge the history of your problem(s). What you don't want is to have to go into a courtroom where a Judge has to decide your case on a he-said-she-said basis! Yes, even log problems/disputes that were adequately resolved up until this point. Again, that way, the Judge will see you've been 'honest' about the whole process.
Now, about your question. Moisture in the house has a number of sources. 1) Drawn in from the outside, 2) Cooking, 3) Long showers in unvented (or poorly vented) bathrooms, 4) Clothes Dryers DIRECTLY vented into the house, 5) transporation through pourous materials such as poured concrete or dirt crawlspace floors, 6) Overly-hight-set-humidifiers.
If you were to take a minute to assess each of the aforementioned sources, you may find the cause of your condensation. Understand ..., condensation is the result of warm, moist air coming in contact with a cool surface. The 'cool surface' needn't necessarily be a window. It could be a brick fireplace wall, a high corner on an exterior wall, or even a ceramic tile floor. Opening a window is not the answer. As Dave suggested, the humidity should be around 40 percent, give or take. When you cook/boil food, consider turning on the fan when the steam gets going. If your bathroom(s) are unvented, crack a window open a little until you leave the bathroom. And so on. IN short, do what you can to mitigate the sources of the moisture. And DO document these things in your booklet!!! Again, this way, when you go to your builder, and describe what you've done, and he STILL isn't working w/you and you need to go to court, you'll have the necessary information to back up your case. Put yourself in the Judge's place and ask yourself, "What would I need to see from the Plaintiff in order to rule in his favor?"