Real Estate Law
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Welcome to JA and thank you for your question.
Just to clarify this was new construction? Do you have a copy of the contract for your purchase? There are two issues that may be in play here and one is that the seller/builder knowingly sold you property with defects that they failed to disclose. This is called fraud. The second is that your property should have come with Warranties. The builder may also have a construction defect issue that would be filed as a complaint with their licensing board.
You have a case the only question is is whether the seller knew of the defects which will weigh heavily against the seller and only add to the seller's liability.
Let's start with the law for construction defects http://www.nolo.com/legal-encyclopedia/new-home-construction-defects-maryland-buyers-rights-against-the-builder.html