6 rules for unincorporated Harford County, Maryland.
Verified from official government sources
Harford County zoning caps residential front-yard fences at 4 feet, allowing 6 feet on corner and double-frontage lots or where a fence is integral to the project design. Rear and side yards commonly reach 6 feet. Aberdeen, Bel Air, and Havre de Grace set their own municipal limits.
Harford County requires a zoning certificate for every fence and wall before installation, confirming height and setback compliance. There is no separate structural building permit for a standard residential fence. Aberdeen, Bel Air, and Havre de Grace issue their own municipal fence permits instead.
Maryland has no spite-fence statute, so a fence built maliciously to injure a neighbor is challenged in Harford County as a common-law private nuisance. Boundary-fence cost sharing is voluntary; no law forces a neighbor to split the cost.
A retaining wall over 4 feet tall, measured from the bottom of the footing, needs a Harford County building permit and engineered design under the International Residential Code. Shorter unloaded walls are exempt, but any wall carrying a surcharge requires a permit at any height.
Every residential pool in Harford County must be enclosed by a barrier at least 48 inches high with a self-closing, self-latching gate that opens outward. The county enforces the 2021 International Swimming Pool and Spa Code, and no pool may be filled before the barrier is approved.
2021 International Swimming Pool and Spa Code Sections 305.2.1, 305.3 (adopted by Harford County)
The top of the barrier shall be not less than 48 inches (1219 mm) above grade where measured on the side of the barrier that faces away from the pool or spa. Pedestrian access doors and gates shall open outward away from the pool or spa, shall be self-closing and shall have a self-latching device.
No Maryland or Harford County law restricts residential fence materials, so wood, vinyl, aluminum, and chain-link are all allowed. Zoning bars barbed wire and electrified fencing in residential districts, while allowing them on agricultural land in the rural north.
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