We moved into our cottage in January 2013. Even before we bought it, we had decided that we would add a round house extension to it, with a reciprocal roof. These types of houses have been built for thousands of years, mainly in China and Japan. It is a very economical and environmentally sound way of building, and can be adapted to suit many climates and site conditions. We would like to share our experience of the build with our readers here, in case someone would like to embark on a similar project.