looking to find out if a dormant addition open to all elements over the past 5 years is affecting the structural integrity of the original house

I am looking to find out if a large dormant addition to a house (approx 1,200 sq ft) that has been open to all elements (including raccoons) over the past 5 years has affected the structural integrity of the original house. Visible damage (mold, rotten wood) is present in the addition and it was constructed using wood. I would like to hire a professional to assess the situation and provide an evaluation. If necessary, I may need additional services to conduct structural repairs and/or renovations. I am expecting a thorough report that explains the condition of the addition and the original structure of the house, its structural integrity, and recommendations for any repairs or renovations needed.