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Fence height limits and permits in Denver

Denver publishes its fence rules plainly, and they are unusually specific about how the fence is built — not just how tall it is.

• Front: 4 ft. Back: 6 ft. Outside industrial areas, fences in front of the primary street-facing façade — usually the wall with the front door — are capped at 4 feet. Behind that line, 6 feet.
• 6 inches back from the sidewalk. Every fence and wall must sit at least 6 inches back from the public sidewalk, regardless of where the property line falls. Fences may not be built in the right-of-way, which includes streets, alleys, sidewalks and tree lawns.
• Zoning permit: over 4 ft. Any fence taller than 4 feet needs one. Any wall over 12 inches — including a retaining wall — needs one.
• Building permit depends on the post. A post-hole dug fence only needs a building permit above 8 feet. Every other fence and wall type needs one above 4 feet.
• Masonry and retaining walls over 6 ft require commercial engineering plan review plus a building permit.
• Landmarks, historic districts and designated parkways. Any fence or wall, at any height, needs a permit — including the short ones that would otherwise be exempt.
• Floodplain or sewer. If the property is in a floodplain, or you are digging within 2 feet of the sewer line, a sewer use and drainage permit may be required.

Over-height fences and walls are possible in some situations; the criteria are in Section 10.5.5 of the Denver Zoning Code. A contractor who works in Denver regularly will pull the zoning permit as a matter of course — if a bid has no permit line and the fence is 6 feet, ask why.

What Denver’s ground and weather do to a fence

Three local conditions drive most of the fence failures here, and all three are worth raising with a contractor before you sign.

Expansive soils. The Colorado Geological Survey reports that most homes, schools and roads in the state sit on potentially expansive clay, and that bentonite and montmorillonite can swell up to 20% by volume when they take on water — exerting up to 30,000 pounds per square foot. That is what tilts posts, cracks flatwork and pushes retaining walls out of plumb. Post depth, footing diameter and drainage matter more in Denver than the fence panel does.

Hail. NOAA’s National Severe Storms Laboratory identifies the Colorado–Nebraska–Wyoming corner as “hail alley,” averaging seven to nine hail days a year — the most in the country. Vinyl gets brittle in cold and can crack on impact; ask about the grade and the impact rating rather than assuming all vinyl is equal.

Altitude and UV. The EPA notes UV rises about 2% for every 1,000 feet of elevation. At a mile up, stains and paints break down faster than the manufacturer’s flatland schedule suggests. Budget for refinishing wood sooner, or spend the difference up front on powder-coated aluminum or steel.

Many Denver lots are alley-loaded, which adds a second street-facing side and a gate that has to work in snow. Ask how the gate is braced and whether it swings clear of accumulated ice.

Rules change. Verify current requirements with Denver Community Planning and Development before you build. Nothing here is legal advice.

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