McDougal Construction and Espinosa Entered a Contract to Build the Latter

McDougal Construction and Espinosa entered a contract to build the latter a two-story house.However,after the company began its construction,Espinosa decided that she wanted a terrace garden,making the house a three-story.McDougal indicated the additional costs to Espinosa and completed the job including the terrace garden - neither of which was in writing or included in the original contract.Espinosa paid McDougal the original amount,but did not pay the extra amount for the third story.Discuss if the court will admit an oral testimony of the McDougal's to the original contract.