As for the decoration, I personally don't think it is necessary to find a decoration company. The decoration company is actually an intermediary. The materials are not his, the workers are hired, and so are the designers. Therefore, the decoration company only plays the role of intermediary, which is unnecessary!
You can save a lot of money by going to the building materials market to buy materials and finding a carpenter yourself. Designers are even less necessary. You have an aesthetic, too. Design it yourself. Either ask the carpenter to design a rough plan for you, and you can add it yourself. It's not bad to decorate it, and it can save 10 thousand yuan