Chester County PA sets no retaining-wall standard. Your borough or township regulates them through its zoning and building codes. Many require a permit and cap wall height near the street. West Goshen Township limits a retaining wall in the front setback area to 4 feet and requires a permit.
Retaining walls are governed by municipal ordinances and the PA Uniform Construction Code, not by Chester County. Height limits, setbacks and permit thresholds vary. In West Goshen Township, retaining walls may be permitted between the street line and building setback line only up to 4 feet high and at least 5 feet from the right-of-way; all freestanding and retaining walls require a zoning permit, and walls 4 feet or taller require a building permit. Check your municipality and expect an engineered design for taller walls under the building code.
Building a non-compliant or unpermitted retaining wall can lead to a municipal citation, a fine, and an order to modify or remove the wall.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Chester County's retaining walls rules stack up against other locations.
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