Retaining walls in Montgomery County, MD
A retaining wall up to 48 in, measured from the bottom of the footing, needs no permit unless it supports a surcharge. Retaining walls made necessary by street changes are exempt from setbacks.
A person last checked these rules on October 20, 2026. This is guidance only, so confirm with Montgomery County before you build.
The details
- Disturbing more than 5,000 sq ft, or moving 100 cubic yards, needs a sediment control permit.High confidence
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SetbackIQ reads the zoning, flood zone, historic district, and environmental maps for your lot. Then it applies these rules.
Common questions
- When does a retaining wall need a permit or an engineer in Montgomery County?
- A retaining wall up to 48 in, measured from the bottom of the footing, needs no permit unless it supports a surcharge. Retaining walls made necessary by street changes are exempt from setbacks.
Sources
- Montgomery County DPS, Permits Required list (land disturbance). Checked 2026-10-21
Land Disturbance (greater than 5,000 square feet or 100 cubic yards or more of earth movement) [likely requires a permit].
Disclaimer: This is general information, not legal or professional advice for any one property. Codes change. SetbackIQ is not a zoning determination, a permit, or a survey, and it does not replace an architect, engineer, or lawyer. Confirm with your building and zoning offices before you build, buy, or sign a contract.