Service Area · Lone Tree, CO
Lone Tree issues its own permits and accepts applications online only. Its zoning code ties retaining-wall permits to load as well as height: a wall over two feet that carries a vertical load needs a building permit. In 2026 the City also adopted the state wildfire code and mapped a Wildfire Urban Interface District with permit rules of its own.
Lone Tree's zoning code requires a building permit for any retaining wall over four feet and for any retaining wall over two feet that carries a vertical load. A wall that holds up a raised patio or a hot tub pad can fall into that second group, so what sits behind the wall matters as much as its height. Walls and fences inside a front setback are also limited to four feet.
Under the City's 2026 wildfire ordinance, any fence or wall in the Wildfire Urban Interface District needs a building permit regardless of height, and no landscaping can be installed or altered there without a landscaping permit. The City notified affected landowners by letter when the district was proposed, and its planning manager has said the code is not retroactive. If your lot is in the district, a seat wall or planting change that comes with the patio needs the City's sign-off first.
The City strongly recommends HOA or architectural committee approval before starting any permitted work. Underneath the paperwork, Lone Tree subdivisions fall within the Colorado Geological Survey's north-central Douglas County study, which found claystone soils that swell when wet and windblown soils that can collapse. That is the case for compacted base and a #4 rebar grid at 12 inches on center under every Apex slab.
Service Area · Lone Tree, CO
If it is over two feet and carries a vertical load, yes. Walls over four feet always need one. Inside the City's Wildfire Urban Interface District, any wall needs a permit regardless of height.
The district is drawn on the City's zoning map, and affected landowners were notified by letter when it was proposed. The City's Planning Division can confirm a specific address, and Apex checks before quoting any wall or planting work.
That depends on your HOA's covenants, but the City strongly recommends HOA or architectural committee approval before any permitted work starts. Designing to the HOA's rules from the first sketch saves a second submission.
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