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Rancho Cucamonga · Building on your lot

Building on a hillside in Rancho Cucamonga

Rancho Cucamonga'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 Rancho Cucamonga Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Rancho Cucamonga's code says

Rancho Cucamonga code What Rancho Cucamonga's code adds
Soils or geology report
  • A geologic and soils report is required.
    Applies: Hillside design review applications, in the hillside overlay zone or on slopes of 8% or greater.
    § 17.16.140 · code text
    A geologic and soils report, prepared by an approved soils engineering firm and in sufficient detail to substantiate and support the design concepts presented in the application as submitted.
Grading and retaining walls
  • Grading allowed if landforms keep their natural character; contour grading, limited cut and fill or split levels may be required.
    Applies: Slope Zone 2, natural slopes of 5% to 7.99%.
    § 17.52.020 · code text
    Padded building sites are permitted; however, techniques such as contour grading, combined slopes, limited cut and fill, and split-level architectural prototypes, or padding for the structures only, may be required to reduce grading.
When hillside rules apply
  • Hillside review applies in the hillside overlay zone and on any property sloped 8% or more, including single-family homes.
    § 17.16.140 · code text
    All projects within the hillside overlay zone and any properties with an eight percent slope or greater, including but not limited to:

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

What extra rules apply to a hillside lot in Rancho Cucamonga?

Rancho Cucamonga's code: Hillside review applies in the hillside overlay zone and on any property sloped 8% or more, including single-family homes. (§ 17.16.140); Grading allowed if landforms keep their natural character; contour grading, limited cut and fill or split levels may be required. (Slope Zone 2, natural slopes of 5% to 7.99%.) (§ 17.52.020).

General information, not legal advice.

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Rancho Cucamonga Municipal Code — full text