Answer
Do I need foundations for a garden wall?
Yes, most need a proper footing sized to the wall and ground; skipping it is why walls fail.
In short
Most garden walls need a proper footing to stay sound, sized to the wall and the ground. A dry stone wall has its own footing detail, while a mortared or retaining wall needs more. Skipping the footing is why walls lean and crack, so we build it right below ground.
Arrange a consultation
Send a few photographs and a sentence about the site. We will reply personally.