Grand Designs is a Channel 4 TV series covering unusual architectural house-building projects, presented by Kevin McCloud and produced by Talkback. The properties featured in the series vary wildly from homes underground to converted water towers, with the only common factor being that they are all rather unusual or extravagant in some way. An example project from the series was Ben Law's woodsman cottage which was built largely with wood harvested from the surrounding woodland, using few commercial materials and predominantly free labour.

A series on properties outside the UK, called Grand Designs Abroad, was broadcast in Autumn 2004.

Another spin-off show began in February 2007 called Grand Designs: Trade Secrets, which was broadcast immediately after the main Channel 4 show each week. This gave hints and tips about building and showed some "behind the scenes" material from the week's show.

There was also a less known spin-off show called Grand Designs Indoors, there were only six episodes in this series. It was broadcast in the spring of 2001.

There is also a magazine of the same name published by Channel 4 as well as a set of awards recognising excellence in product design and architecture, and an annual exhibition, "Grand Designs Live", all derived from the success of the TV series.