Mammoth Lakes Zoning, Planning & Building Codes

Last reviewed: July 3, 2026

Overview

Mammoth Lakes regulates land use through Title 17 – ZONING of the Town Municipal Code; the Title implements the General Plan and is the primary tool for allowed uses, development form, and procedures in Town (see § 17.04.001 and § 17.04.010) . The code separates district-level rules (the zoning districts and their allowed uses) from town‑wide site and design rules (site planning, setbacks, snow storage, parking, etc.), and it layers in specific plans, master plans, and overlays that create area‑specific rules (see § 17.16.040 and § 17.36.010) . Procedural chapters govern permits (ministerial and discretionary), appeals, and administrative authority so applicants know when an administrative permit, use permit, or map amendment is required (see § 17.08.010, § 17.08.020, and the use‑permit chapter § 17.68.010) . For practical navigation, start with the Town’s map and the district table, then check the townwide standards, then any specific plan or overlay that covers your parcel (see § 17.16.030, § 17.36.010, and the specific-plan rules § 17.112.070) .

How Mammoth Lakes's code is organized

• Title and purpose — The ordinance is published as Title 17 – ZONING; it is expressly intended to implement the General Plan and to be a permissive code (uses must be listed to be allowed) per § 17.04.001 and § 17.04.010 .
• Zoning map and district table — The adopted Zoning Map and Table 17.16.030 list all zoning symbols and district names (for example D, OMR, MLR, RMF‑1, RSF, R, OSSC, NVSP, CSP) and the map is incorporated by reference (see § 17.16.030) .
• District rules vs. townwide rules — Chapters 17.20–17.32 contain district‑specific allowed uses and basic standards, while Chapters 17.36–17.56 house town‑wide site planning, development, and performance standards (setbacks, snow storage, exterior lighting, landscaping, and parking) (see § 17.16.040 and § 17.36.010) .
• Procedures and administration — Land‑use permit requirements, application filing, ministerial vs. discretionary review, and appeals are in Chapters 17.08, 17.60, 17.68, and 17.100; administrative responsibilities are assigned in Chapter 17.92 (see § 17.08.010, § 17.68.010, § 17.92.020, § 17.100.020) .

Zoning district families

(First check the Zoning Map; below are the Code’s named district families in Table 17.16.030 — bolded where used in the Town code.)

• Residential single‑family (RSF) and Rural Residential (RR / RR‑E) — typical low‑density single‑family rules and overlays like the RR‑E equestrian overlay are listed in Table 17.16.030; front/side/rear yard minima and lot sizes are set by the residential standards table § 17.20.030 and cross‑referenced to setbacks § 17.36.100 .
• Multifamily (RMF‑1, RMF‑2) — higher density residential zones with their own lot, coverage, and height standards shown in Table 17.20.030 (see § 17.20.030) .
• Commercial / Downtown (D), Old Mammoth Road (OMR), Mixed Lodging/Residential (MLR) — the commercial district chapter explains intent and form; the Downtown (D), Old Mammoth Road (OMR), and Mixed Lodging/Residential (MLR) districts emphasize pedestrian‑oriented frontages and a maximum FAR of 2.0 in several of those districts (see § 17.24.010) .
• Resort (R) and Planned Residential Development (PRD) — Resort and PRD zones require master plans or development plans; the Resort zone sets programmatic limits (e.g., maximum residential density of eight units/acre, site coverage up to 50% for master plans) and requires master plan approval (see § 17.32.110 and § 17.116.010 – § 17.116.030) .
• Special district symbols in the table — NVSP (North Village Specific Plan), CSP (Clearwater Specific Plan), OSSC (Open Space/Stream Corridor protection overlay), and SDD (Snow Deposition Design Overlay) are listed explicitly in Table 17.16.030 and modify underlying standards where shown on the zoning map (see § 17.16.030) .

Citywide development standards (how they work)

• Where to look — Townwide standards live in Chapter 17.36 and related chapters 17.36–17.56; those chapters apply to development in all zones unless a district or specific plan overrides them (see § 17.36.010 and cross‑references in § 17.20.030) . (If a conflict exists, the district‑specific rule controls.)
• Setbacks, heights, lot coverage — the residential standards table (Table 17.20.030) lists front yard, side yard, rear yard minima and maximum lot coverage and references Section 17.36.100 for setback rules and § 17.36.060 for height calculations (see § 17.20.030 and § 17.36.100) . Example numeric values are in Table 17.20.030 (e.g., RSF front yard = 20 ft, maximum lot coverage in RSF = 40%) — always verify against the table for your zone (see § 17.20.030) .
• Snow, grading, landscaping and screening — the Town explicitly requires snow storage calculations, grading limits, and landscaping/screening standards for all development (see § 17.20.030 and multiple sections in Chapter 17.36) .
• Parking — off‑street parking minima, design standards, and exceptions are part of the townwide standards and vary by use; special rules apply for small infill and housing splits (see § 17.36.100 and the urban lot split / two‑unit project parking exceptions) . (For the code’s parking tables and rules, consult the Mammoth Lakes parking page.) Link: Mammoth Lakes Parking (/us/california/mammoth-lakes/parking).
• Flexibility tools — minor adjustments (Director adjustments) are available for limited deviations (Table 17.76.020 allows e.g., up to 20% setback reductions, up to 10% lot‑coverage increases, 10% height increases for adjustments) and full variances are handled under Chapter 17.72 when adjustments are insufficient (see § 17.76.020) .

(First mention link: Mammoth Lakes Development Standards (/us/california/mammoth-lakes/development-standards). Also first mention of "zoning" earlier linked: Mammoth Lakes Zoning (/us/california/mammoth-lakes/zoning). First mention of "land use" linked to Mammoth Lakes Land Use (/us/california/mammoth-lakes/land-use). First mention of "design review" below is linked.)

Design, discretionary review & administrative paths

• Design review — Most multifamily and non‑residential projects and any project in a specific district requiring design oversight must pass design review; the standards, authority to impose conditions, and appeal rules are in Chapter 17.88 (see § 17.88.060) . Link (first mention): Mammoth Lakes Design Review (/us/california/mammoth-lakes/design-review).
• Permit types and where they live — Ministerial (administrative) approvals (e.g., ministerial review of some ADUs, administrative permits), administrative adjustments, and ministerial two‑unit approvals are processed by the Director; discretionary approvals (use permits, variances, zone changes, specific‑plan approvals) go to the Planning and Economic Development Commission or Town Council per the procedural chapters (see § 17.92.020, § 17.68.010, and § 17.100.020) .
• Appeals and timing — Director decisions may be appealed to the Commission; Commission decisions may be appealed to Council; appeal procedures and timelines are specified in Chapter 17.100 (see § 17.100.020) .
• Practical navigation tip — Start at the district table to confirm uses and required permit levels, review Chapter 17.36 for site standards that always apply, then check any specific plan or overlay that covers the parcel (NVSP, CSP, OSSC, SDD), then confirm which procedural path applies (ministerial vs. use permit vs. map amendment) (see § 17.16.030, § 17.36.010, § 17.112.070, § 17.116.010) .

Link (first mention): Mammoth Lakes Overlay Districts (/us/california/mammoth-lakes/overlay-districts).

Specific plans, master plans, overlays that matter in Mammoth Lakes

• Specific plans and area plans — The code recognizes specific plans (for example the North Village Specific Plan (NVSP) and Clearwater Specific Plan (CSP)) in the zoning table; once a specific plan is adopted, subsequent projects must be found consistent with it and the Council may impose specific‑plan fees (see § 17.16.030 and § 17.112.070) .
• Master plans & Resort zoning — Large resort properties require a master plan (Resort zone minimum area 20 acres, max residential density 8 units/acre, hotel density 16 rooms/acre, and 50% maximum site coverage for master plans) and development within a resort zone is governed by the master plan (see § 17.32.110 and § 17.116.010–.030) .
• Overlays to watch — OSSC (Open Space/Stream Corridor Protection), SDD (Snow Deposition Design Overlay), and RR‑E (equestrian overlay) can modify setbacks, allowable uses, and other standards; check the Zoning Map legend entry and the overlay chapters for parcel‑level effects (§ 17.16.030) .

(First mention link): Mammoth Lakes Historic Preservation (/us/california/mammoth-lakes/historic-preservation) — consult if your project affects landmarks or historic districts.

Building permits & review (the permit path)

• Threshold rule — No building or grading permit or final Certificate of Occupancy will be issued unless the proposed land use complies with the zoning code and any required land‑use permit is in place (see § 17.04.040(2) and § 17.08.020) .
• Common permit sequence — 1) confirm permitted uses under the Zoning Map/Table 17.16.030, 2) identify required land‑use permits under Chapters 17.16–17.32, 3) submit environmental documentation and design review if required (Chapter 17.88), 4) obtain building permits after planning conditions are satisfied (see § 17.16.040, § 17.68.010, and § 17.88.060) .
• Administrative ministerial paths — The code implements ministerial tools required by state law: for example, the ministerial two‑unit project process (ministerial approval for up to two primary dwelling units on a lot in single‑family zones) follows Government Code § 65852.21 and is established in the Town code (see the two‑unit / urban lot split rules § 17.52.270 and related urban lot split provisions) .
• Recording conditions — Where the code requires deed restrictions (e.g., density‑bonus projects, urban lot splits), ministerial approvals may not take effect until required documents are recorded (see the urban lot split / two‑unit project provisions) .

(First mention link): California Building Standards Code (/us/california/building-codes). Building permits must comply with the State code (Title 24) and local building‑safety requirements noted in the municipal code (see § 17.04.030 and the building permit prerequisites in § 17.04.040(2)) .

State housing law in Mammoth Lakes — summary of how ADU, two‑unit, and density laws interact with the Town code

Overview: Mammoth Lakes adopts local implementing rules but the Town code specifically creates ministerial paths and local programs to implement applicable state laws; where state law requires ministerial review or limits local standards, the Town code references and implements those processes.

• ADUs / JADUs — The Town regulates ADUs and JADUs in Section 17.52.055 (detailing size, setbacks, maximums, attached vs detached ADU rules, JADU rules, and exceptions to local lot‑coverage/setback limits for ADU construction). For example: detached ADU max = 1,200 sq ft, attached ADU GFA limits and 4‑ft side/rear setback minimum exceptions for 800 sq ft ADUs are spelled out in that ADU section (see § 17.52.055(3)–(5)) . Link (first mention): Mammoth Lakes ADUs (/us/california/mammoth-lakes/adu). State ADU rules (California ADU law) also constrain certain local requirements (see the ADU handbook included with the materials) .
• Two‑unit projects & urban lot splits (SB‑9 style topics) — The Town provides a ministerial path for up to two primary dwelling units on a lot in single‑family zones in compliance with Government Code § 65852.21; this code section (local cross‑references in § 17.52.270 and the urban lot split provisions) sets objective standards, owner‑occupancy and deed‑restriction requirements (e.g., no short‑term rentals for units created by an urban lot split), and objective setback/height/parking rules (see § 17.52.270 and related urban lot split language) .
• Density bonus — Mammoth Lakes maintains a local Density Bonus program in Chapter 17.136 and density bonus procedures and allowed bonuses in Chapter 17.140; the Town authorizes a local program (Town Density Bonus Program) including a points system to obtain bonuses (up to twice allowed base density for qualifying projects), and requires deed‑restricted workforce units and prohibits transient rentals in density‑bonus projects (see § 17.136.040, § 17.140.030) .
• Where the code defers to state law — The Town’s ministerial two‑unit and ADU provisions expressly reference state statutes (the code implements the state ADU/JADU and two‑unit ministerial schemes and applies objective standards where required) — see § 17.52.270 (two‑unit) and § 17.52.055 (ADUs) for the Town’s implementing rules and cross‑references to state code where relevant . Link (first mention): California housing laws (/us/california/housing-laws) and California ADU law (/us/california/california-adu-laws).

Practical orientation — how to use this overview

1. Identify your parcel on the Town Zoning Map and note the zoning symbol (see § 17.16.030) .
2. Read the district chapter for allowed uses and the permit type (Chapters 17.20–17.32) and the townwide Chapter 17.36 standards (see § 17.16.040 and § 17.36.010) .
3. Check for overlays (OSSC, SDD, RR‑E) and any specific or master plan that applies (see § 17.16.030 and § 17.112.070) .
4. Determine whether your project is ministerial (ADU, two‑unit, building permit) or discretionary (use permit, variance) and follow the steps in Chapters 17.60, 17.68, and 17.100 for filing and appeals (see § 17.68.030 and § 17.100.020) .
5. Coordinate with Building and the Mammoth Lakes Fire Protection District for permit issuance and life‑safety conditions referenced in the code (see § 17.04.040(2) and the fire mitigation references in the two‑unit / ADU rules) .

Source References

• Mammoth Lakes Title 17 — Town Zoning Code (print export / Municode): Table of zoning districts and Title/Chapter organization; see § 17.04.001 and § 17.04.010 for title and purpose . URL: https://library.municode.com/ca/mammoth_lakes/codes/code_of_ordinances (Title 17 print export) .
• Zoning map, district table (Table 17.16.030) and district regulations (Chapters 17.20–17.32): see § 17.16.030 and § 17.16.040 .
• Residential standards & development table (Table 17.20.030): see § 17.20.030 (lot sizes, setbacks, lot coverage, densities) .
• Townwide standards (site planning, setbacks, snow storage, parking): Chapter 17.36 (see § 17.36.010 and § 17.36.100) .
• ADU and JADU regulations: § 17.52.055 and following subsections (attached/detached ADU sizes, setbacks, JADU rules) .
• Two‑unit projects / urban lot splits (ministerial housing): see the urban lot split / two‑unit project provisions (local implementation of Gov. Code § 65852.21) — § 17.52.270 and related subsections .
• Design review procedures and authority: Chapter 17.88, including design review decision rules § 17.88.060 .
• Use permits and discretionary processing: Chapter 17.68 (purpose and applicability) and application rules § 17.68.010–.030 .
• Adjustments and variances: Chapter 17.76 (adjustments table § 17.76.020) and Chapter 17.72 (variances referenced) .
• Density bonus / Town program: Chapters 17.136 and 17.140 (Town Density Bonus program rules and allowed bonuses, deed‑restriction requirements, and transient‑rental prohibitions for bonus projects) .
• Appeals and nonconforming rules: Chapters 17.100 and 17.96 (appeals § 17.100.020; nonconforming use rules § 17.96.080) .