The most expensive upgrade would be the kitchen and the bathrooms - which are usually the really expensive rooms in the house. But if you have the money, you can turn a fixer-upper into your dream home.
Heck, the Property Brothers do it on their HGTV show. As Drew Scott always says, if you buy it turn key, it can cost you an arm and a leg. Upgrading run down property in conrast, puts equity in your pocket and a renovated fixer upper is always more than when you bought it.
They are based in Toronto and that is where those fixer uppers happen. A whole different kettle of wax compared to motown even though they are not far apart geographically they are light years apart in uh atmosphere.