Grand Designs: Trade Secrets was a spin-off broadcast immediately after the main Channel 4 show each week for series 7 & 8. Acting as a companion piece, it gave hints and tips about building and showed some "behind the scenes" material from the week's show. Trade Secrets series 1, is a companion for Series Seven of Grand Designs, and Trade Secrets series 2 is a companion for Series Eight.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | February 2007 | May 2007 | 12 |
| Season 2 | January 2008 | February 2009 | 12 |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Unassigned Episodes | 24 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 24 |
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