Retaining Walls: frequently asked questions
These answers are general. For your situation, check the official sources listed below or ask a professional.
Do I need a permit for a retaining wall?
Often for walls over 4 feet, or for walls supporting a surcharge such as a driveway; some cities require one for lower walls. Check with your building department.
Why do retaining walls fail?
Mostly because of water pressure behind the wall, an inadequate base, or a wall too tall for its design.
Who is responsible for a wall on the property line?
It depends on ownership and local law; a survey and the deed help clarify it.