How deep will the foundations be?

The foundations for any orangery need to be at least one metre deep. If the ground has poor soil conditions, such as lots of clay mixed in and trees close by then the foundations need to be deeper than this in order to make your orangery even more secure. That’s because the trees will suck moisture from the clay, causing it to shrink and later create structural difficulties. Certainly, building regulations have tightened up in this regard to the extent that it’s not unusual to have to dig foundations for an orangery, conservatory or home extension which are actually deeper than the foundations of the existing home.