Trees overhanging public sidewalks and streets in Gaithersburg must maintain a minimum clearance of 8 feet above sidewalks and 14 feet above streets to ensure safe passage for pedestrians and vehicles. Property owners are responsible for trimming their own trees that encroach into these clearance zones, even if the trunk is on private property. Roadside trees planted within the public right-of-way along county-maintained roads are regulated under Montgomery County Code Chapter 49 (Roadside Trees) and require a permit from the county Department of Transportation before any cutting, trimming, or removal work is performed. A concurrent permit from the Maryland Department of Natural Resources is also required for roadside tree work under the state Roadside Tree Law (Natural Resources Article 5-406). Private trees on residential property can generally be trimmed without a government permit, as long as the work does not kill the tree and does not involve a specimen tree protected under the Forest Conservation Law (Chapter 22A). Utility companies including Pepco and BGE maintain their own trimming rights along power line corridors.
Gaithersburg and Montgomery County require property owners to maintain trees so they do not obstruct public sidewalks, streets, bike lanes, or sight lines at intersections. The minimum clearance standards are 8 feet above sidewalks and shared-use paths, and 14 feet above streets and travel lanes. Property owners who fail to maintain these clearances may receive a notice from Gaithersburg Public Works or Montgomery County DOT requiring trimming within a specified timeframe. If the owner does not comply, the city or county may perform the work and bill the property owner. Montgomery County Code Chapter 49 governs trees planted within the public right-of-way along county-maintained roads, collectively known as roadside trees. Any person who wants to cut, trim, or remove a roadside tree must first obtain a permit from the county Department of Transportation, Division of Highway Services, Tree Maintenance Section. A concurrent permit from the Maryland Department of Natural Resources is also required under the state Roadside Tree Law (Natural Resources Article 5-406), which protects trees growing within the public right-of-way along state and county roads. The dual-permit process ensures that roadside trees are only removed or significantly trimmed when necessary and that replacement planting is planned. Permit applications require a description of the proposed work, the reason for the request, and the species and size of the tree. The county tree maintenance crew may perform the work itself or authorize a licensed tree care company to proceed. Private trees growing entirely on residential property within Gaithersburg can generally be pruned or trimmed by the homeowner or a hired arborist without a government permit. However, if the tree is a specimen tree (typically 24 inches or greater diameter at breast height, depending on species) and is located on a property subject to an active Forest Conservation Plan under Chapter 22A, significant trimming or removal may trigger mitigation requirements. Improper trimming that kills or severely damages a protected tree can result in replacement planting requirements calculated on a caliper-inch-for-caliper-inch basis, plus potential fines. Utility companies Pepco and BGE have easement rights to trim trees within their power line corridors on a regular cycle (typically every 3 to 4 years) and do not need homeowner permission, though they typically provide advance notice. Homeowners who want more aggressive trimming near power lines should contact their utility provider rather than attempting the work themselves due to electrocution risk.
Unauthorized cutting or trimming of a roadside tree without required permits: fine up to $500 per tree. Killing or severely damaging a protected tree: replacement planting at 1-inch caliper per 1-inch diameter removed, plus potential fines. Failure to maintain sidewalk or street clearance after notice: city or county performs work at owner's expense.
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