I prefer to run in park but in such cases I know that a lot of people who makes from their houses (a room) gym. Yeah it is good and very useful because you do not waste your time on road to the gym anymore. For that you will need to renovate or rebuilt your house. In past I did something like that with my kitchen and I can tell that to find somebody who will do that fast and on high level is practically impossible. Anyway is good when you find ways to save on both hiring a professional and taking the DIY approach. You can check their work over here: https://www.buildingquotes.co.uk/cost-guides/