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Simi Valley · Building on your lot

Building on your lot in Simi Valley

Simi Valley sets its own limits on fences, accessory structures and home businesses. Lower fence limits apply in the TSSA, and a home business needs a valid Home Occupation Permit.

Key points

  • Fence height: In residential zones, front-setback fences are limited to 42 inches, or 6 feet if see-through; other property line fences, 6 feet.
  • Accessory size: On lots under 1 acre, accessory structures are limited to 30% of the main building's square footage, up to 1,200 square feet.
  • Home businesses: A home business may use 1 room, at most 20% of the home, with no non-resident employees; professional services, 1 client at a time.

Each rule below is marked Simi Valley code or CA state law and links to the section it comes from (checked October 2026). General information, not legal advice.

Fences and walls

Simi Valley code What Simi Valley's code adds
Corner visibility
  • No fence, wall or hedge over 24 inches without an encroachment permit.
    Applies: In the traffic safety sight area within the public right-of-way; height from the top of the nearest curb, or street level.
    § 9-30.050 · code text
    Within the TSSA, as defined in Article 8 (Definitions), and within the public right-of-way, no fences, walls, or hedges over 24 inches high measured from the top of the nearest street curb (street level, if no curb) are allowable without a permit authorized by law (encroachment permit).
  • No fence, wall or hedge over 36 inches without a permit allowed by law.
    Applies: In the traffic safety sight area on private property; height from the top of the nearest curb, or street level.
    § 9-30.050 · code text
    Within the TSSA and located on private property, no fences, walls, or hedges over 36 inches high measured from the top of the nearest street curb (street level, if no curb) are allowable without a permit authorized by law.
Front yard height
  • Fences, walls and hedges can be at most 42 inches tall.
    Applies: Front yard setback in residential zones, outside the traffic safety sight area.
    § 9-30.050 · code text
    Within the front yard setback, no fence, wall, or hedge shall exceed 42 inches in height and no see-through fence shall exceed six (6) feet in height.
  • See-through fences can be at most 6 feet tall.
    Applies: Front yard setback in residential zones, outside the traffic safety sight area.
    § 9-30.050 · code text
    Within the front yard setback, no fence, wall, or hedge shall exceed 42 inches in height and no see-through fence shall exceed six (6) feet in height.
  • A combined fence can be at most 6 feet tall in total.
    Applies: Residential front setback outside the sight area; solid part at most 42 inches, rest see-through; Planning Director approves the design.
    § 9-30.050 · code text
    A combination of fence, wall, or hedge and see-through fence shall be permitted, said design subject to approval by the Planning Director, in which the solid fence, wall, or hedge does not exceed 42 inches and the total height, including see-through fence, does not exceed six (6) feet in height.
  • Retaining walls can be at most 36 inches tall.
    Applies: Front or street-facing side setback in residential zones, outside the traffic safety sight area.
    § 9-30.050 · code text
    Retaining walls within the front or street facing side setback may not exceed 36 inches in height.
Side and rear yard height
  • A solid landscaped hedge can be up to 6 feet tall.
    Applies: At the side property line, at least 10 feet back from the front property line, outside the sight area, in residential zones.
    § 9-30.050 · code text
    However, a maximum six (6)-foot high solid landscaped hedge may be permitted at the side property line with a setback not less than 10 feet from the front property line.
  • Property line fences and walls can be at most 6 feet tall, from the highest adjacent grade.
    Applies: Outside the front setback and the traffic safety sight area in residential zones, unless allowed by law.
    § 9-30.050 · code text
    Property line fences and walls outside of the front setback, may not exceed six feet in height as measured from the highest adjacent grade, unless authorized by law.
  • Side or rear fences, walls or hedges can be up to 2 feet taller.
    Applies: Residential properties next to arterial streets, or next to commercial or industrial zoned property.
    § 9-30.050 · code text
    The height of a rear or side residential fence(s), wall(s), or hedge(s) may be increased for up to two additional feet for properties abutting arterial street(s) or a residentially zoned property adjacent to a commercially or industrially zoned property.
Permit
  • Yes. An encroachment permit is required for fences, walls or hedges over 24 inches.
    Applies: In the traffic safety sight area within the public right-of-way.
    § 9-30.050 · code text
    no fences, walls, or hedges over 24 inches high measured from the top of the nearest street curb (street level, if no curb) are allowable without a permit authorized by law (encroachment permit).
  • Yes. Fences, walls or hedges over 36 inches need a permit allowed by law.
    Applies: In the traffic safety sight area on private property.
    § 9-30.050 · code text
    no fences, walls, or hedges over 36 inches high measured from the top of the nearest street curb (street level, if no curb) are allowable without a permit authorized by law.
  • Yes. A Zoning Clearance, plus an Encroachment Permit if a new driveway approach is needed.
    Applies: Vehicle gates.
    § 9-30.050 · code text
    A Zoning Clearance and Encroachment Permit (if a new driveway approach is required) must be obtained;

Sheds, garages and other accessory structures

Simi Valley code What Simi Valley's code adds
Size or lot coverage
  • Together, accessory structures can cover at most 40% of any required yard.
    Applies: Residential accessory structures.
    § 9-44.220 · code text
    Accessory structures shall not cumulatively cover more than 40 percent of any required yard and shall maintain a minimum six (6) foot separation from all on-site structures.
  • Each at most 30% of the main building's square footage, up to 1,200 square feet.
    Applies: Lots under 1 acre.
    § 9-44.220 · code text
    On lots less than one acre in size, each accessory residential structure shall not be larger than 30 percent of the square footage of the primary structure as defined in subsection B.1 up to a maximum of 1,200 square feet.
  • Can be increased up to 2,000 square feet.
    Applies: Lots under 1 acre, through an administrative action approval.
    § 9-44.220 · code text
    The maximum size of an accessory residential structure may be increased beyond the 30 percent limit up to 2,000 square feet in compliance with Section 9-52.030 Administrative Actions.
  • Each at most 30% of the main building's square footage, up to 2,000 square feet.
    Applies: Lots of 1 acre or more.
    § 9-44.220 · code text
    On lots of one acre or more, each accessory residential structure shall not exceed 30 percent of the square footage of the primary structure as defined in subsection B.1 up to a maximum of 2,000 square feet.
  • Can be increased beyond the 30% limit, up to 2,000 square feet.
    Applies: Lots of 1 acre or more, through an administrative action approval.
    § 9-44.220 · code text
    The maximum size of an accessory residential structure may be increased beyond the 30 percent limit, up to 2,000 square feet in compliance with Section 9-52.030 Administrative Actions, and beyond 2,000 square feet in compliance with Section 9-52.070 Conditional Use Permits.
  • Can be larger than 2,000 square feet.
    Applies: Lots of 1 acre or more, with a conditional use permit.
    § 9-44.220 · code text
    The maximum size of an accessory residential structure may be increased beyond the 30 percent limit, up to 2,000 square feet in compliance with Section 9-52.030 Administrative Actions, and beyond 2,000 square feet in compliance with Section 9-52.070 Conditional Use Permits.
  • Each accessory structure can be at most 2,000 square feet.
    Applies: Properties in an Animal Overlay Zone (A), (H) or (L).
    § 9-44.220 · code text
    On properties within an Animal Overlay Zone (A), (H), (L), each accessory residential structure shall not exceed 2,000 square feet.
  • Can be larger than 2,000 square feet.
    Applies: Lots of 1 acre or more in an Animal Overlay Zone, with a conditional use permit.
    § 9-44.220 · code text
    On lots of one acre or more in size and within an Animal Overlay Zone, the maximum size of an accessory residential structure may be increased beyond 2,000 square feet in compliance with Section 9-52.070 Conditional Use Permits.
Distance from the house
  • At least 6 feet from all other structures on the lot.
    Applies: Residential accessory structures.
    § 9-44.220 · code text
    Accessory structures shall not cumulatively cover more than 40 percent of any required yard and shall maintain a minimum six (6) foot separation from all on-site structures.

Running a business from home

Simi Valley code What Simi Valley's code adds
Space used
  • 1 room only, at most 20% of the home's gross floor area, entered from inside the home.
    § 9-44.090 · code text
    The area of use for all home occupations shall be confined entirely to one room in the dwelling, not to exceed 20 percent of the total gross floor area of the dwelling, and the entrance to the home occupation space shall be from within the dwelling.
Customer visits
  • No more than 1 client on site at a time.
    Applies: Business and professional services.
    § 9-44.090 · code text
    A home occupation shall be limited to business and professional services that do not involve the on-site presence of more than one client at a time
  • No extra car or foot traffic beyond what is normal for the zone.
    § 9-44.090 · code text
    The home occupation shall not attract or generate any additional vehicular or foot traffic to the dwelling beyond that which is considered normal for the zoning district in which the home occupation is located.
Employees
  • No employees who do not live in the home.
    § 9-44.090 · code text
    No person, other than residents of the home, shall conduct business at the dwelling which is granted the Home Occupation Permit.
Permit
  • A valid Home Occupation Permit is required.
    § 9-44.090 · code text
    It is unlawful to operate a business from a dwelling without a valid Home Occupation Permit, issued in compliance with Subsection F (Home Occupation Permit procedures), below.

Solar panels and EV chargers

Simi Valley code What Simi Valley's code adds
EV charger permit
  • Expedited review and permit approval within 7 business days.
    Applies: EV charging station permit applications.
    § 8-25.06 · code text
    The expedited time line for EVCS application review and permit approval shall be seven (7) business days.
  • Issued over the counter in person, or through electronic submittal.
    Applies: Level 1 or Level 2 EV chargers in a single-family garage covered by the California Residential Code.
    § 8-25.07 · code text
    A permit application for a level 1 or level 2 EVCS installation in a single family dwelling garage where such dwelling is within the Title and Scope of the California Residential Code for One- and Two- Family Dwellings (Title 24, Part 2.5), need not use the adopted checklist as set forth in Section 8-25.05 or submit a permit application subject to completeness and review as set forth in Section 8-25.06, but alternatively may submit a completed EVCS electrical permit application eligible for in-person over-the-counter issuance or electronic submittal issuance, upon receipt by the Building and Safety Division permit processing system.
  • No use permit or zoning clearance; a construction permit is still needed, eligible for expedited processing.
    Applies: Stations meeting city standards; in a home garage or carport they must bar public access and be tamper- and theft-resistant.
    § 9-44.185 · code text
    A use permit or Zoning Clearance is not required for an Electric Vehicle Charging Station in compliance with this section.

Tree removal

Simi Valley code What Simi Valley's code adds
Exemptions
  • No replacement or payment for the tree's value is required.
    Applies: When the city requests removal to get adequate line of sight for public safety.
    § 9-38.070 · code text
    An adequate line-of-sight distance may be achieved in order to ensure public safety.
Permit to remove
  • Yes, a Tree Removal Permit is required.
    Applies: Removing, relocating, cutting down or otherwise destroying a protected tree.
    § 9-38.070 · code text
    No protected tree shall be removed, relocated, cut down, or otherwise destroyed, unless a Tree Removal Permit has been first issued by the Director.
Replacement trees
  • The appraised value goes to planting bigger trees than the minimum standards require.
    Applies: Trees tied to a proposal for urban development.
    § 9-38.070 · code text
    When a tree(s) is associated with a proposal for urban development, the appraised value of the removed tree(s) shall be applied to upgrading the size of tree plantings associated with the project above minimum planting standards.
  • The appraised value sets the value of replacement trees planted on the site.
    Applies: Trees proposed for removal on a vacant parcel.
    § 9-38.070 · code text
    When a tree(s) proposed for removal is located on a vacant parcel, the appraised value of the tree(s) shall be used to establish the value of the replacement tree(s) planted on the subject site.
  • A fee to the city equal to the appraised value that cannot be replanted on the site.
    Applies: When the tree's value is substantial and replanting the full value on the site is not feasible.
    § 9-38.070 · code text
    The amount of the fee shall consist of the appraised value of the tree(s) which cannot be replanted on the subject site.

Other Simi Valley rules on this

Simi Valley's code also has these chapters. We have not summarized their values on this page yet; read them in the library.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

How tall can a fence be in Simi Valley?

In residential zones, front-setback fences are limited to 42 inches, or 6 feet if see-through; other property line fences, 6 feet.

How big can a shed or accessory building be in Simi Valley?

On lots under 1 acre, accessory structures are limited to 30% of the main building's square footage, up to 1,200 square feet.

Can I run a business from my home in Simi Valley?

A home business may use 1 room, at most 20% of the home, with no non-resident employees; professional services, 1 client at a time.

Do I need a permit for solar panels or an EV charger in Simi Valley?

Simi Valley's code: Expedited review and permit approval within 7 business days. (EV charging station permit applications.) (§ 8-25.06); Issued over the counter in person, or through electronic submittal. (Level 1 or Level 2 EV chargers in a single-family garage covered by the California Residential Code.) (§ 8-25.07).

Do I need a permit to remove a tree in Simi Valley?

Simi Valley's code: No replacement or payment for the tree's value is required. (When the city requests removal to get adequate line of sight for public safety.) (§ 9-38.070); Yes, a Tree Removal Permit is required. (Removing, relocating, cutting down or otherwise destroying a protected tree.) (§ 9-38.070).

General information, not legal advice.

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