could we request an audit on payout we did for house remodel

You are certaintly entitled to a detailed accounting of the materials and construction costs of your remodel. Make your request for invoices reflecting where the money was spent in writing and send them via certified mail for proof of delivery and receipt. If the contractor cannot justify its expenses, request a refund of any excess funds received and not accounted for. If they won't pay, you may have a breach of contract claim against them.