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Twentynine Palms · Building on your lot

Building on a hillside in Twentynine Palms

Twentynine Palms's own rules on building on a hillside, with the code text for every value.

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Each rule below links to the section of the Twentynine Palms Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Twentynine Palms's code says

Twentynine Palms code What Twentynine Palms's code adds
Soils or geology report
  • A detailed geologic report is required.
    Applies: Permits or applications leading to roads, structures or land division where the area has slopes of 30% or greater.
    § 19.64.020 · code text
    A detailed report shall be filed with all development permits and land use applications that would lead to the construction of roads or structures or the division of land where the area to be developed contains slopes of 30 percent or greater.
Grading and retaining walls
  • Grading should be minimized within 20 feet of the development's outer property lines.
    Applies: Hillside grading areas, unless the grading matches the existing adjacent slopes.
    § 19.64.020 · code text
    Grading should be minimized within 20 feet of all perimeter property lines of the development unless the grading is similar to the existing adjacent slopes.
When hillside rules apply
  • Hillside grading rules apply to foothill areas with a main slope of 30% or greater.
    Also foothill watershed areas and geologically unstable hillsides.
    § 19.64.020 · code text
    Foothill areas having a predominant slope of 30 percent or greater.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

What extra rules apply to a hillside lot in Twentynine Palms?

Twentynine Palms's code: Hillside grading rules apply to foothill areas with a main slope of 30% or greater. (Also foothill watershed areas and geologically unstable hillsides.) (§ 19.64.020); Grading should be minimized within 20 feet of the development's outer property lines. (Hillside grading areas, unless the grading matches the existing adjacent slopes.) (§ 19.64.020).

General information, not legal advice.

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Twentynine Palms Municipal Code — full text