Longmont's fence rules in LMC 15.05.100 set construction standards: posts at least 4x4, embedded at least 24 inches deep and spaced no more than 8 feet apart; wood in contact with concrete or soil must be pressure-treated or naturally decay-resistant; finished side must face outward; fences may not block utility meters, fire hydrants, or easements; and the property owner must call 811 before digging.
Per the Building Services Fence Building Guide implementing LMC 15.05.100: posts must be 4x4 (nominal) or larger, embedded in concrete or earth a minimum of 24 inches deep, with a maximum 8-foot spacing between posts. Redwood, cedar, or pressure-treated lumber is recommended for in-ground use; any wood touching concrete or soil must be pressure-treated or naturally decay-resistant. The finished (smooth) side must face the public right-of-way, common open space, or other public areas. Electric meters located on the front quarter of the house may not be fenced in, and fences may not block fire hydrants, meter access, or easements where the city or utility needs periodic access. Owners must call the Utility Information Center at 811 at least 3-5 working days before digging post holes. Fences must be built within the permitted property; owners are responsible for surveying their own property lines.
Fences with undersized posts, posts spaced more than 8 feet apart, or blocking meters/hydrants/easements may fail inspection. Digging without an 811 locate can result in utility damage charges and personal liability.
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