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Glendora · Building on your lot

Building on a hillside in Glendora

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

What Glendora's code says

Glendora code What Glendora's code adds
Grading and retaining walls
  • No grading is allowed where the natural slope is over 35%.
    Applies: Hillside parcels, meaning an average slope of 10% or greater.
    § 21.04.030 · code text
    Grading shall be prohibited in any area where the natural slopes exceeds thirty-five percent.
  • Retaining walls may be at most 6 feet high, measured from the base.
    Applies: Hillside parcels; walls that can be seen from public streets or rights-of-way.
    § 21.04.030 · code text
    Retaining walls visible from public rights-of-way shall not exceed six feet in height as measured from the base of the walls.
  • Crib walls may be at most 15 feet high, measured from the base.
    Applies: Hillside parcels; walls that can be seen from public streets or rights-of-way.
    § 21.04.030 · code text
    Crib walls visible from public rights-of-way shall not exceed fifteen feet in height as measured from the base of the walls.
When hillside rules apply
  • Hillside rules apply at 10% average slope or more; grading over 150 cubic yards needs an approved plan.
    § 21.04.030 · code text
    The provisions of this section shall apply to all parcels with an average slope of ten percent or greater as calculated pursuant to this section.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

What extra rules apply to a hillside lot in Glendora?

Glendora's code: Hillside rules apply at 10% average slope or more; grading over 150 cubic yards needs an approved plan. (§ 21.04.030); No grading is allowed where the natural slope is over 35%. (Hillside parcels, meaning an average slope of 10% or greater.) (§ 21.04.030).

General information, not legal advice.

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Glendora Municipal Code — full text