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Mammoth Lakes · Building on your lot

Building on your lot in Mammoth Lakes

Mammoth Lakes sets its own fence heights, accessory-structure sizes and home-business rules. Fence limits depend on the setback and cover all zones except Industrial.

Key points

  • Fence height: Town rule: outside Industrial zones, fences are limited to 3 ft in front and street side setbacks and 6 ft elsewhere.
  • Detached garages: The town limits detached garages to 1,000 sq ft unless the Director approves more or the parcel is 1 acre or more.
  • Home businesses: Town rule: home businesses need a Town business tax certificate; retail sales, vehicle repair and adult businesses are not allowed.

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

Fences and walls

Mammoth Lakes code What Mammoth Lakes's code adds
Height anywhere on the lot
  • At most 6 feet tall.
    Applies: In all zones except Industrial, on the rest of the lot outside the setbacks.
    § 17.36.040 · code text
    All other zones | 3 ft. | 6 ft. | 6 ft.
Front yard height
  • At most 3 feet tall.
    Applies: In all zones except Industrial, within the front or street side setback.
    § 17.36.040 · code text
    All other zones | 3 ft. | 6 ft. | 6 ft.
Side and rear yard height
  • At most 6 feet tall.
    Applies: In all zones except Industrial, within the side or rear setback.
    § 17.36.040 · code text
    All other zones | 3 ft. | 6 ft. | 6 ft.

Sheds, garages and other accessory structures

Mammoth Lakes code What Mammoth Lakes's code adds
Size or lot coverage
  • At most 1,000 square feet of floor area, including any workshop or storage space.
    Applies: For a detached garage on a single-family parcel, unless the Director allows more by administrative permit or the parcel is 1 acre or larger.
    § 17.52.040 · code text
    A detached accessory garage for a single-family residential parcel shall not occupy more than 1,000 square feet of floor area, including any workshop or storage space within the garage, unless a larger area is authorized by the Director through an administrative permit, or the size of the parcel is one acre or greater.
  • At most 600 square feet of gross floor area, not counting garages.
    Applies: For a detached living area in single-family residential zones.
    § 17.52.040 · code text
    The gross floor area (i.e., interior habitable area not, including garages) shall not exceed 600 square feet.
  • At most 600 square feet of gross floor area.
    Applies: For an accessory workshop or studio, except where a workshop is combined with a garage.
    § 17.52.040 · code text
    The gross floor area shall not exceed 600 square feet; except where a workshop is combined with a garage. See Subsection (2)d of this section.

Running a business from home

Mammoth Lakes code What Mammoth Lakes's code adds
Employees
  • No employees on site other than full-time residents of the home.
    Applies: Except as allowed for cottage food operations.
    § 17.52.140 · code text
    A home occupation shall have no employees working on the site of the home occupation other than the full-time residents of the dwelling, except as allowed for cottage food operations as defined in Health and Safety Code § 113758.
Permit
  • A Town business tax certificate is required.
    § 17.52.140 · code text
    A home occupation shall require a Town business tax certificate.
  • A use permit is required, and the Commission may add conditions such as hours or noise limits.
    Applies: For other home business uses that do not meet this section's standards.
    § 17.52.140 · code text
    Other uses not consistent with this section may be approved as a home occupation, subject to approval of a use permit, and provided that the Commission may require conditions of approval limiting hours of operation, noise levels, or any other aspect of the operation, to ensure compatibility with on-site and adjacent residential uses.
Businesses not allowed
  • Adult business activities or businesses; automotive and other vehicle repair and service (body or mechanical), painting, storage, or upholstery; dance club or night club; dismantling, junk, or scrap yards; medical clinics, laboratories, or doctor's offices; mini self-storage; retail sales; welding and machine shop operations; wood cutting and processing businesses; and other similar incompatible uses as determined by the Director
    § 17.52.140 · code text
    The following are examples of business activities that are not incidental or compatible with residential activities, and are, therefore, prohibited as home occupations:

Solar panels and EV chargers

Mammoth Lakes code What Mammoth Lakes's code adds
EV charger permit
  • Apply in person, by mail or electronically, with any required processing and inspection fees; electronic signatures accepted.
    Applies: Applies to electric vehicle charging stations.
    § 15.04.170 · code text
    The intent of this section is to promote and encourage the use of electric vehicles, in accordance with California Government Code § 65850.7, by creating an expedited, streamlined permitting process for electric vehicle charging stations, while promoting public health and safety and preventing specific adverse impacts on the installation and use of such charging stations.
Solar height and setbacks
  • The panel array cannot be taller than the maximum legal building height.
    Applies: To qualify for expedited review as a small residential rooftop solar system.
    § 15.04.160 · code text
    A solar panel or module array that does not exceed the maximum legal building height as defined by the authority having jurisdiction.
Solar permit process
  • Expedited administrative approval; apply in person, by mail or electronically, with required processing and inspection fees.
    Applies: Small residential rooftop solar (up to 10 kilowatts AC or 30 kilowatts thermal, on a single-family home or duplex) meeting the Town checklist.
    § 15.04.160 · code text
    Upon confirmation by the Building Official of the application and supporting documentation being complete and meeting the requirements of the checklist, the Building Official shall administratively approve the application and issue all required permits or authorizations.
  • Only 1 inspection is required.
    Applies: Small residential rooftop solar systems eligible for expedited review.
    § 15.04.160 · code text
    For a small residential rooftop solar energy system eligible for expedited review, only one inspection shall be required, which shall be done in a timely manner and may include a consolidated inspection by the Town's Building Official and a representative of the Mammoth Lakes Fire Protection District.

Tree removal

Mammoth Lakes code What Mammoth Lakes's code adds
Exemptions
  • Exempt: removing a tree that is an immediate safety hazard to life or property.
    Applies: As determined by named Town officials, such as the Fire Marshal or Building Official, or a public utility company.
    § 17.36.140 · code text
    Removal of a tree that presents an immediate safety hazard to life or property, as determined by the Town Manager, Director, Building Official, Public Works Director, Police Chief, Fire Marshal, public utility company, or designees;
  • Exempt: routine tree maintenance, such as trimming or thinning branches.
    § 17.36.140 · code text
    Routine tree maintenance, such as the trimming or thinning of branches;
  • Exempt: removing trees knocked down by weather or an act of God.
    § 17.36.140 · code text
    Removal of trees felled by natural weather conditions or an act of God;
  • Exempt: removing visibly dead trees.
    § 17.36.140 · code text
    Removal of visibly dead trees;
  • Exempt: conifer and deciduous trees less than 12 inches in diameter at breast height (DBH).
    § 17.36.140 · code text
    Coniferous and deciduous trees with a diameter at breast height (DBH) of less than 12 inches.
Permit to remove
  • Yes, a tree removal permit is required.
    Applies: Any non-exempt tree on private or public property in the Town.
    § 17.36.140 · code text
    No person shall remove or cause to be removed any tree from any property, which is subject to this section and not otherwise exempted pursuant to Subsections (c), (f), and (g) of this section, without first obtaining a valid tree removal permit pursuant to the requirements of Chapter 17.60.
  • No separate tree removal permit is needed.
    Applies: When a land use, building or grading permit already includes a tree removal and protection plan that meets the standards.
    § 17.36.140 · code text
    If a site has received development approval through a land use, building, or grading permit that includes a tree removal and protection plan consistent with the standards of this section, then a separate tree removal permit is not required, and removal of trees is considered approved through the land use, building, or grading permit.

Other Mammoth Lakes rules on this

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

Who this affects

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Frequently asked questions

How tall can a fence be in Mammoth Lakes?

Town rule: outside Industrial zones, fences are limited to 3 ft in front and street side setbacks and 6 ft elsewhere.

How big can a shed or accessory building be in Mammoth Lakes?

The town limits detached garages to 1,000 sq ft unless the Director approves more or the parcel is 1 acre or more.

Can I run a business from my home in Mammoth Lakes?

Town rule: home businesses need a Town business tax certificate; retail sales, vehicle repair and adult businesses are not allowed.

Do I need a permit for solar panels or an EV charger in Mammoth Lakes?

Mammoth Lakes's code: Apply in person, by mail or electronically, with any required processing and inspection fees; electronic signatures accepted. (Applies to electric vehicle charging stations.) (§ 15.04.170); The panel array cannot be taller than the maximum legal building height. (To qualify for expedited review as a small residential rooftop solar system.) (§ 15.04.160).

Do I need a permit to remove a tree in Mammoth Lakes?

Mammoth Lakes's code: Exempt: removing a tree that is an immediate safety hazard to life or property. (As determined by named Town officials, such as the Fire Marshal or Building Official, or a public utility company.) (§ 17.36.140); Exempt: routine tree maintenance, such as trimming or thinning branches. (§ 17.36.140).

General information, not legal advice.

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