This project belongs to the vernacular tradition. In this tradition, the knowledge of how to construct a house is held in common by a community. On this website you can download information and inspiration to help you to design and build your own house much like the one in the photo which cost a total of €25,000 to construct. It took me a total of 50 days to build, which I did over two years with the help of friends, family, neighbours and a few specialists…
Please note, while all this should be possible in Ireland, it is imperative that you have an assigned certifier who may be an architect or engineer to advise you at all stages of the project. You are responsible for meeting local codes and legislation. You must satisfy yourself regarding the application of statutory requirements, local building regulations, codes, insurance certification or other requirements or recommendations relevant to the location where and materials with which you plan to build. Where required you should always seek the advice of a relevant qualified professional.
Below is a group building a version of this in Texas , and a completed version in New Zealand. There are other sites with info too like wikihouse.cc