Will mcmahon services ever use my information to contact me? (Please note your information will only ever be used by McMahon Services to contact you. Your privacy is very important to us.) This field is for validation purposes and should be left unchanged.What can mcmahon services construction do for you? Contact McMahon Services & Construction for your water and sewage damage, fire and smoke damage cleanup, mold removal, roofing, siding, and remodeling services today!Who is john mcmahon? John McMahon is Mike's eldest son. John handles large loss fires, smoke and water damage. John began working for the family business in 1988 where he developed his extensive hands-on knowledge of construction. His proficiency eventually enabled him to become an on-site supervisor with McMahon Services.