19.Ignoring electrical systems.
Replace the old electrical system with a new one, it will be more reliable and calm.
20.Cardinal changes when the renovation has already started.
If you decide to make changes to the project before you start, it will be cheaper and easier. But if you change something when the renovation is already in the process, it's always more complicated and more expensive.
21.Ignore the details.
Imagine you see the whole picture, and you like it - the living room will integrate with the kitchen, there will be a dining area, and over there we will put a couch. But you should think about the details, and there are a lot of questions that need answers: where the sockets should be placed and how many of them there should be, is there enough storage and work surfaces in the kitchen, how to organize a comfortable workspace, etc.
22.Focus on TV and Internet shows about renovation.
Yes, they are good for inspiration, there you can look up interesting ideas, there is definitely beautiful furniture, etc., but these shows do not reveal full and information to the viewer, and they are also adapted for a particular object, and the concept of your renovation may be quite different.
23.Use the builder's renovation.
Most builders sell apartments with renovation and furniture. But this renovation is quite simple. It lacks uniqueness and character, your apartment is similar to your neighbor's apartment. It often has no coziness and comfort of home. It uses the simplest materials, and you quickly feel that something needs to change.