Unfortunately you cannot. When you secure a mortgage loan through a lender the amount of money loaned is secured only for the purchase price. Rehab work can be expensive and most lenders do not feel confident enough to allow loan funds being used towards expenses that, more times than none, tend to go over budget.
#AskTheDanielMtz Show Episode: 3: Home Rehabs, Concessions and Investing Properties
Daniel Martinez

There are some great new options coming out for people who are interested in rehabbing a home and getting funding for both the purchase and rehab. We just got one for our 1927 Tudor fixer-upper in Detroit! Wells Fargo offers a great option called their Purchase and Renovate Loan which I highly recommend looking into if you’re looking for funds for both purchase price and renovation.