How much does it cost to build one house? Is it cost/costs?

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what is the subject in the above sentence and is the verb "cost" the right word or should it be costs?

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by Jim@StratusPrep » Sat Jun 02, 2012 10:05 pm
Cost is correct, the subject is it [or price]
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by confuse mind » Sun Jun 03, 2012 5:14 am
Does[helping verb] it [singular] cost [basic form of the verb]...........

And thus 'cost'