What are the advantages of in-house software development?

It can be cheaper. The people who are doing it are more familiar with the company and the systems within the company. The people commissioning the software are more familiar with their own developers. There can be better communications as the work is being done within the company. The in-house developers can give more time to the project. They will follow in-house standards which can make things easier to work with in the future. These are just some of many advantages.