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Lake Forest · Building on your lot

Building on your lot in Lake Forest

Lake Forest's city code sets fence and wall heights by setback and controls home businesses. Accessory structures fall under the rules of the R1 and RS single-family districts.

Key points

  • Fence height: City code limits fences to 3.5 feet within the front yard setback and 6 feet in interior side or rear setbacks.
  • Home businesses: A home business may use at most 20% of the home's floor area and have 2 customers at a time; only residents may work.
  • Accessory structures: City code has accessory use and structure rules for the R1 and RS single-family districts (§ 9.44.060 and § 9.48.060).

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

Fences and walls

Lake Forest code What Lake Forest's code adds
Height anywhere on the lot
  • No more than 12 feet tall.
    Applies: Outside a required setback, in the main building area.
    § 9.144.080.5 · code text
    Outside of a required setback (main building area) | 12 feet
Front yard height
  • No more than 3.5 feet tall.
    Applies: Within the front yard setback.
    § 9.144.080.5 · code text
    Within front yard setback | 3.5 feet [1]
  • Can be raised to no more than 6 feet tall.
    Applies: If built outside the required front yard setback or 10 feet back from the front property line, whichever is less.
    § 9.144.080.5 · code text
    Height can be increased above 3.5 feet to a maximum height of 6 feet if constructed outside of the required front yard setback or setback 10 feet from the front property line, whichever is less.
Side and rear yard height
  • No more than 6 feet tall.
    Applies: Within the interior side or rear yard setback.
    § 9.144.080.5 · code text
    Within interior side or rear yard setback | 6 feet [2]
  • No more than 6 feet tall.
    Applies: Within a side or rear setback that borders a street.
    § 9.144.080.5 · code text
    Within side or rear setback bordering streets | 6 feet
  • Never more than 8 feet tall, measured from the lower side.
    Applies: Side or rear setbacks where the neighboring lot is higher than the base of the fence or wall.
    § 9.144.080.5 · code text
    However, in no case shall such a fence or wall exceed 8 feet from the base of the fence/wall to the top when measured from the lower side
Permit
  • A permit is required to remove, change, damage or alter a perimeter wall.
    Applies: Perimeter walls; no permit is needed to return the wall to its approved condition.
    § 9.170.012 · code text
    No person or persons shall remove, change, deface, destroy or otherwise alter a perimeter wall, except to return the perimeter wall to its approved condition, without a permit therefor issued by the Planning Commission or the City Council on appeal.
  • A site development permit is required.
    Applies: Exceptions or changes to the fence and wall height limits.
    § 9.144.080.5 · code text
    Exceptions and modifications to the fence and wall height provisions may be permitted subject to the approval of a site development permit application processed in compliance with the provisions of Section 9.184.010.

Running a business from home

Lake Forest code What Lake Forest's code adds
Space used
  • No more than 20% of the home's floor area.
    § 9.146.060 · code text
    No more than 20% of the floor area of the dwelling unit may be used for the home occupation; any business use of the dwelling unit that exceeds 20% constitutes a primarily commercial use and is prohibited in all residential zones.
Customer visits
  • No more than 2 customers or clients at a time.
    Applies: At the home at any one time.
    § 9.146.060 · code text
    No more than two customers or clients may be at the dwelling unit at a time.
Employees
  • Only residents of the home can work in the business.
    § 9.146.060 · code text
    Only the residents of the dwelling unit may be engaged in the home occupation.
Businesses not allowed
  • Sale of goods not produced on the premises
    § 9.146.060 · code text
    There shall be no sale of goods not produced on the premises.

Lot splits under SB 9

Lake Forest code What Lake Forest's code adds
How the lot may be divided
  • Each new lot must be between 40% and 60% of the original lot area.
    Applies: Applies to each lot created by the split.
    § 7.50.050 · code text
    Each of the resulting lots must be between 60% and 40% of the original lot area.
Minimum new lot size
  • Each new lot must be at least 1,200 square feet.
    Applies: Applies to each lot created by the split.
    § 7.50.050 · code text
    The resulting lots must each be at least 1,200 square feet.
Standards
  • The lot must be in a single-family residential zone.
    Applies: Applies to the zone of the lot to be split.
    § 7.50.050 · code text
    The lot to be split is in a single-family residential zone.
  • Each new lot must border a public street with at least 12.5 feet of frontage.
    Applies: Applies to lot access.
    § 7.50.050 · code text
    Each resulting lot must adjoin a public street right-of-way with frontage of at least twelve and one-half (12.5) feet.
  • No more than 2 homes of any kind, including an ADU or JADU, per new lot.
    Applies: Applies to each lot created by an urban lot split.
    § 7.50.050 · code text
    No more than two dwelling units of any kind may

RV and boat parking

Lake Forest code What Lake Forest's code adds
Parking on the street
  • RVs may park for up to 72 hours.
    Applies: Non-commercial RVs on residential streets; other vehicles over 22 feet long, trailers and similar oversized vehicles may not park on public streets.
    § 12.16.070 · code text
    recreational vehicles, as defined by this Code, excluding recreational vehicles that are being used for commercial purposes as defined in subsection (C)(1), parked in a residential area as defined in subsection C for a maximum of 72 hours
  • Only temporarily, while actually loading or unloading.
    Applies: Oversized vehicles (over 22 feet long, trailers and similar) loading or unloading people or property on a public street.
    § 12.16.070 · code text
    vehicles temporarily parked for the purpose of, and while actually engaged in, loading or unloading persons or property

Solar panels and EV chargers

Lake Forest code What Lake Forest's code adds
EV charger permit
  • Approved with all needed permits when the application meets the checklist and safety standards; no energizing before City approval.
    Applies: Applies to EV charging station permit applications.
    § 8.74.040 · code text
    A permit application that satisfies the information requirements in the City's adopted checklist shall be deemed complete and be promptly processed.
Solar permit process
  • Staff issue a nondiscretionary permit when a complete application meets the approved checklist, standard plan and this chapter.
    Applies: Small residential rooftop solar systems, unless the Director decides a use permit is warranted.
    § 8.72.070 · code text
    Unless the Director determines a use permit is warranted, City staff shall issue a building permit or other nondiscretionary permit within a reasonable period of time after receipt of a complete application that meets the requirements of the approved checklist, standard plan and this chapter.

Pets, chickens and bees

Lake Forest code What Lake Forest's code adds
Large animals
  • Livestock need a strong fence; wire fences need 3 tight barbed wires, one at least 4 feet up, or equal.
    § 10.12.090 · code text
    Every owner, keeper, custodian or harborer of livestock shall erect and/or maintain a fence as herein described to contain and confine all livestock kept or maintained on his or her premises.
  • Animals may not run loose or graze on public land, highways or others' land without written consent.
    § 10.12.080 · code text
    No person owning or having charge, care, custody or control of any animal shall cause or permit, either willfully or through failure to exercise due care or control, any such animal to be placed, staked or to graze or be upon the land of another without the written consent of the owner or other authorized person, or upon public lands or highways or to allow any such animal to run at large.

Other Lake Forest rules on this

Lake Forest'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 Lake Forest?

City code limits fences to 3.5 feet within the front yard setback and 6 feet in interior side or rear setbacks.

How big can a shed or accessory building be in Lake Forest?

City code has accessory use and structure rules for the R1 and RS single-family districts (§ 9.44.060 and § 9.48.060). Lake Forest also has a related rule: Accessory uses and structures in the R1 district (§ 9.44.060) — single-family district; Accessory uses and structures in the RS district (§ 9.48.060) — residential single-family district.

Can I run a business from my home in Lake Forest?

A home business may use at most 20% of the home's floor area and have 2 customers at a time; only residents may work.

Can I split my lot under SB 9 in Lake Forest?

Lake Forest's code: Each new lot must be between 40% and 60% of the original lot area. (Applies to each lot created by the split.) (§ 7.50.050); Each new lot must be at least 1,200 square feet. (Applies to each lot created by the split.) (§ 7.50.050).

Can I park an RV or boat at my home in Lake Forest?

Lake Forest's code: RVs may park for up to 72 hours. (Non-commercial RVs on residential streets; other vehicles over 22 feet long, trailers and similar oversized vehicles may not park on public streets.) (§ 12.16.070); Only temporarily, while actually loading or unloading. (Oversized vehicles (over 22 feet long, trailers and similar) loading or unloading people or property on a public street.) (§ 12.16.070).

Do I need a permit for solar panels or an EV charger in Lake Forest?

Lake Forest's code: Approved with all needed permits when the application meets the checklist and safety standards; no energizing before City approval. (Applies to EV charging station permit applications.) (§ 8.74.040); Staff issue a nondiscretionary permit when a complete application meets the approved checklist, standard plan and this chapter. (Small residential rooftop solar systems, unless the Director decides a use permit is warranted.) (§ 8.72.070).

Can I keep chickens or bees at my home in Lake Forest?

Lake Forest's code: Livestock need a strong fence; wire fences need 3 tight barbed wires, one at least 4 feet up, or equal. (§ 10.12.090); Animals may not run loose or graze on public land, highways or others' land without written consent. (§ 10.12.080).

General information, not legal advice.

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