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Laguna Niguel · Building on your lot

Building on a hillside in Laguna Niguel

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

What Laguna Niguel's code says

Laguna Niguel code What Laguna Niguel's code adds
Soils or geology report
  • A geotechnical study by a state-registered professional engineer or engineering geologist.
    Applies: For a planning commission exception allowing more grading on slopes of 30% or more.
    § 9-1-81 · code text
    Such an exception shall be approved only if the planning commission finds, after review of a geotechnical study by a professional engineer or engineering geologist registered in the state, that:
Grading and retaining walls
  • No grading on slopes of 30% or more unless the planning commission approves an exception.
    Applies: Hillside projects; slope is averaged over 100-foot horizontal intervals.
    § 9-1-81 · code text
    Grading on slopes with a gradient of 30 percent or more shall be prohibited unless the planning commission approves an exception pursuant to subsection (d) of this section.
  • The minimum the planning commission finds is needed for reasonable development of the site.
    Applies: Grading amounts within a site and cubic yards brought in or taken out.
    § 9-1-81 · code text
    Grading quantities, both within a site and in cubic yards imported or exported, shall be the minimum that the planning commission determines is needed to:
  • No more than 60 feet high.
    Applies: Manufactured slopes in hillside projects; no more than 1 terrace drain.
    § 9-1-81 · code text
    Manufactured slopes shall not exceed 60 feet in vertical height, nor shall more than one terrace drain be used on such slopes.
  • No more than 6 feet high.
    Applies: Retaining walls and crib walls; up to 3 tiered walls may be approved where more retaining is needed.
    § 9-1-81 · code text
    Retaining walls and crib walls shall not exceed six feet in height and shall be planted with vines and/or other landscape screening.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

What extra rules apply to a hillside lot in Laguna Niguel?

Laguna Niguel's code: No grading on slopes of 30% or more unless the planning commission approves an exception. (Hillside projects; slope is averaged over 100-foot horizontal intervals.) (§ 9-1-81); The minimum the planning commission finds is needed for reasonable development of the site. (Grading amounts within a site and cubic yards brought in or taken out.) (§ 9-1-81).

General information, not legal advice.

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Ask GoCodebook how Laguna Niguel's building on a hillside rules apply to your situation and get an answer that cites the section.

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