Fence Regulations in Longmont, CO (2026)
8 verified fence regulations for Longmont, Colorado, sourced directly from the municipal code and official government pages.
Verified from official government sources
Height Limits
Under Longmont Land Development Code (LMC) Chapter 15.05.100, residential fences and walls may be a maximum of 6 feet tall, and non-residential fences/walls a maximum of 8 feet. Fences in the front yard (between the front lot line and the front facade) are limited to 42 inches and must be at least 50% transparent. Stricter limits apply within sight distance triangles at corners and driveways.
Fence Height Limits in Longmont
Some RestrictionsPermit Requirements
Longmont requires a building permit for every fence project, including new fences, replacement of any amount of existing fence, swapping fence types (e.g., chain link to wood privacy), changing the location of a fence, and replacing deteriorated fencing with the same material at the same height. Permits are issued by Building Services at 385 Kimbark Street.
Fence Permit Requirements in Longmont
Heavy RestrictionsNeighbor Fence Rules
Longmont Municipal Code requires the finished (smooth) side of any fence to face the public right-of-way, common open space, or other public areas. Property owners — not the City — are responsible for locating property lines. The City does not adjudicate private 'good neighbor' or boundary-line disputes; those are civil matters under Colorado law.
Neighbor and Shared Fence Rules in Longmont
Some RestrictionsRetaining Walls
Longmont does not publish a stand-alone retaining-wall guide; walls are regulated under the adopted 2021 International Building Code (IBC) and 2021 International Residential Code (IRC), enforced by Building Services. Under IRC R404.4 and IBC standards, a permit is generally required when a retaining wall exceeds 4 feet measured from the bottom of the footing to the top of the wall, or when the wall supports a surcharge (slope, driveway, structure).
Retaining Wall Rules in Longmont
Some RestrictionsPool Barriers
All swimming pools deeper than 24 inches and all hot tubs and spas must be enclosed by a fence at least 4 feet tall with openings no larger than 4 inches, per the Building Services 'Fences' guide implementing LMC 15.05.100 and the adopted 2021 International Codes. Gates must have a latch meeting the adopted code, or, for hot tubs/spas, a lockable safety cover meeting the 150-pound load standard may substitute.
Pool Barrier Fencing in Longmont
Heavy RestrictionsFence Requirements
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.
General Fence Construction Requirements in Longmont
Some RestrictionsMaterial Restrictions
Under LMC 15.05.100, fences made of barbed wire, tin, or sheet metal - or partly of those materials - are prohibited. Electric fences are also prohibited, except for low-voltage commercially available 'invisible fences' used to contain domestic pets. Chain-link and woven-wire fencing is banned in the front yard of residential lots (except temporary construction fencing).
Prohibited Fence Materials in Longmont
Heavy RestrictionsApproved Materials
Longmont allows wood, vinyl, masonry, and ornamental metal fencing under LMC 15.05.100. Any species of wood may be used above ground; wood in contact with concrete or soil must be pressure-treated or naturally rot-resistant (redwood or cedar are explicitly suggested). Chain-link is allowed in side and rear yards of residential lots and throughout non-residential properties, but not in residential front yards.
Allowed Fence Materials in Longmont
Some RestrictionsLooking for Boulder County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Longmont city rules.
Fence Regulations in Boulder County →