Grand Design: Series 18
Each episode Kevin McCloud follows different couples / families who are trying to build / improve a property. They can go from the downright stupid to the most high class and dignified properties.

Part 6: Devon Snake House
Kevin McCloud visits a house belonging to an engineer that resembles a giant snake. The building was inspired by an ammonite shell and has a scaly, curving structure that spirals over two levels and combines natural materials with the latest modern technology. However, completing the project within the 12-month schedule may not be possible.