Mammoth Lakes — Development Standards

Last reviewed: July 2, 2026

Overview

This page summarizes what the Town of Mammoth Lakes' Title 17 Zoning Code requires for development standards (setbacks, height, lot coverage, density/FAR and related controls) so applicants and homeowners can translate the ordinance into permit-ready checklists. The town’s primary residential dimensional rules are collected in § 17.20.030 (the Residential Zoning Districts table), with measurement rules, exceptions and overlay/adjustment procedures in chapters cited below. For topics that routinely affect projects—parking, design review, ADUs, and overlay rules—see the linked menu items noted inline for procedural follow-up.

How to read this page

• Bolded terms flag the exact district names and numeric standards from the code (for example, RSF, 25 ft, 35%, 35 ft).
• Every numeric standard below is grounded in the Town code reference cited with the controlling § and the file-search citation for the ordinance extract.

Residential districts — district-by-district (from § 17.20.030)

Note: The Town consolidates the objective residential dimensional standards in Table 17.20.030; individual zones rely on that table for lot size, setbacks, lot coverage, density and height. See § 17.20.030 for the table and cross-references.

RR — Rural Residential

• Purpose & typical uses: RR is for low-density rural residential development and limited accessory uses; single-family dwellings predominate (see underlying zone chapters for use lists). See Chapters 17.16–17.32 for allowed uses.
• Key dimensional standards (Table): Lot area 15,000 sf, Lot width 80 ft, Front setback 25 ft, Side setback 10 ft, Rear setback 20 ft, Max lot coverage 30%, Max height 35 ft. See § 17.20.030 for the table.
• Where it applies: larger single-family lots and outlying neighborhoods designated RR on the Zoning Map. Verify specific parcel zoning with the Town. Verify with the jurisdiction.

RSF — Residential Single-Family

• Purpose & typical uses: RSF supports conventional single-family homes and accessory structures. See Chapters 17.16–17.32 for uses.
• Key dimensional standards: Lot area 7,500 sf, Lot width 75 ft, Front setback 20 ft, Side setback 10 ft, Street-side setback 20 ft, Rear setback 10 ft, Max lot coverage 40%, Max height 35 ft. See § 17.20.030.

RMF-1 — Residential Multi-family 1

• Purpose & typical uses: RMF-1 allows low- to moderate-density multi-family housing (apartments, duplexes, small multi-unit). See Chapters 17.16–17.32 for permitted uses.
• Key dimensional standards: Lot area 10,000 sf, Lot width 80 ft, Density 12 units/acre (base), Max lot coverage 50%, Max height 35 ft. Front/side/rear setback entries are provided in the table and cross-referenced to § 17.36.100. See § 17.20.030.

RMF-2 — Residential Multi-family 2

• Purpose & typical uses: RMF-2 is intended for higher-intensity lodging and multi-family (e.g., hotel/motel or higher-density apartments).
• Key dimensional standards: Lot area 40,000 sf, Lot width 150 ft, Density: hotels 36 rooms/acre; group living 27 rooms/acre, Max lot coverage 60%, Max height 35 ft (table). Front/rear standards per § 17.20.030.

Where the table lists "See Section 17.36.100" for setbacks, the general setback rules and exceptions (projections, open space, encroachments, minimum clearances) are in § 17.36.100; measurement/height method is in § 17.36.060.

Planned and project-specific zones

Planned Residential Development (PRD)

• Purpose & typical uses: The PRD zone (Chapter 17.32) allows flexible site planning to better fit topography and open space, typically for multi-unit or mixed residential projects (single- and multi-family, recreational common facilities, utilities, accessory uses). See § 17.32.080.
• Key standards: PRDs follow the underlying zone for maximum height and lot coverage but have their own minimum site area (2.5 acres), frontage (200 ft) and internal yard minimums (front yard 20 ft, side 10 ft, street-side 20 ft, rear 10 ft). Spacing, open-space, and utilities standards are specified in § 17.32.080.

Master Plans and site-specific standards

• The Town allows master plans/site-specific zoning for larger or special properties; a master plan can set customized development standards (including building heights, lot coverage, setbacks) for an approved area. See § 17.116.020 and related master-plan provisions.

Accessory Dwelling Units (ADUs) and Junior ADUs

• ADU development rules are located in § 17.52.055. ADU standards explicitly modify or override some base zone dimensional rules to comply with state ADU law while retaining several Town limits. Key local points: maximum sizes (attached up to 1,200 sf with common thresholds at 850–1,000 sf depending on bedrooms; detached up to 1,200 sf but smaller when a JADU exists), side/rear encroachment allowances down to 4 ft minimum for small-height ADU portions, and explicit instruction that lot coverage/FAR cannot be enforced to preclude an 800 sf ADU (but ADUs larger than 800 sf must meet the underlying limits). See § 17.52.055 for full rules and limits.

First-order practical links: ADU guidance interacts with the Town’s Mammoth Lakes ADUs menu and will also require building-permit compliance with the California Building Standards Code.

Measurement rules, snow, screening, and special standards

• Height measurement and exceptions: Building height is measured from finished grade to the highest point of the roof/structure; special rules apply where podium parking exists and finished grade is established by the Director. See § 17.36.060.
• Setbacks and permitted encroachments: Setbacks are governed by the applicable zoning district table and the setback rules in § 17.36.100 (open, unobstructed, permitted projections, special buffers and streetside definitions).
• Snow storage: Residential projects must provide dedicated snow storage equal to 75% of the area of all parking and driveways; see § 17.20.030 cross-referenced to § 17.36.110. Snow rules drive driveway widths, site planning, and landscaping.
• Screening and buffers: Where industrial, retail/service, or higher-intensity uses abut residences, the Town requires setbacks (typically 15 ft buffer) and screening/landscaping or masonry fencing; see § 17.36.090.

Practical note: site design must integrate the Town’s Mammoth Lakes Parking, Mammoth Lakes Design Review, and Mammoth Lakes Overlay Districts processes where applicable; those processes can require additional standards or criteria beyond numeric limits.

Density, FAR and incentives

• Residential density: The table in § 17.20.030 lists base residential densities (e.g., 2 units/acre in RR, 4 units/acre in RSF, 12 units/acre in RMF-1). See § 17.20.030 for the specific numbers.
• FAR: The code references FAR in the context of ADUs and multifamily conversions (ADU provisions say lot coverage or FAR shall not preclude two 800 sf ADUs), but a townwide, explicit numeric FAR column for each zone is not presented in the residential table in the materials retrieved. "FAR limitations where applicable" are referenced in § 17.52.055 for ADUs. Verify any zone-specific FAR elsewhere in Title 17 or in a master plan.
• Density bonus and incentives: The Town has a density-bonus program with incentives (including increased lot coverage, setback reductions up to 20%, and height increases up to 10%) for qualifying multifamily projects; see § 17.136.050 (incentives) and the density-bonus chapter for eligibility rules.

Adjustments, variances, and where discretion applies

• Minor adjustments (Director-level): The Director may grant limited adjustments to development standards listed in Table 17.76.020 (e.g., setbacks up to 20% reduction, lot-coverage increase up to 5%, height increase up to 10%). See § 17.76.020 for the allowed adjustments and maximums.
• Variances: Larger departures require a variance under Chapter 17.72, where findings (public health/safety, consistency with general plan, minimum necessary departure) must be made. See § 17.72.040 for variance findings.

For small discretionary relaxations consider an adjustment; for anything beyond the caps in § 17.76.020, prepare a variance application and targeted findings. Applicants should consult the Town before choosing path. See Mammoth Lakes Variances and Exceptions.

Decision-relevant summary table (quick reference)

Checklist

• Confirm zoning district for the parcel and read the underlying chapter (Chapters 17.16–17.32).
• Use § 17.20.030 to pull the table dims for lot area, setbacks, coverage, density and cross‑check § 17.36.060 for height measurement.
• If proposing an ADU, follow § 17.52.055 (size, encroachment, and lot coverage/FAR exceptions) and consult the Mammoth Lakes ADUs menu.
• Size site plan to provide required snow storage (75% of parking/driveway area) and screening where required (see § 17.36.110, § 17.36.090).
• Confirm parking counts and layout per the Town’s Mammoth Lakes Parking rules.
• If you need a small numeric relief, prepare an adjustments submittal under § 17.76.020; anything larger will need a variance per Chapter 17.72.
• Expect design guidance and possibly design review per the Town’s standards—see Mammoth Lakes Design Review.
• Building permit-level work must comply with the California Building Standards Code (Title 24); consult the Building Division for code compliance.

Risks & Ambiguities

Plain-English Summary

Mammoth Lakes’ zoning sets explicit, table-driven development standards for its residential zones—RR, RSF, RMF‑1 and RMF‑2—covering lot sizes, setbacks, lot coverage, height (generally 35 ft) and base densities; ADUs get special carve-outs that protect an 800‑sf ADU from lot coverage/FAR blocking and the Director can grant modest adjustments for small departures. Base measurement rules, setback exceptions, and adjustment/variance paths are in separate chapters you must read with your parcel plan.

Source References

• Title 17 — ZONING (Town of Mammoth Lakes), general title and purpose. § 17.04.001, § 17.04.010.
• § 17.20.030 — Residential zoning districts development standards (Table 17.20.030: lot area, setbacks, lot coverage, density).
• § 17.36.100 — Setback requirements and exceptions.
• § 17.36.060 — Height measurement and height limit exceptions.
• § 17.52.055 — Accessory dwelling units (size, setbacks, lot coverage/FAR exceptions).
• § 17.32.080 — Planned residential development standards.
• § 17.76.020 — Director adjustments table and caps.
• § 17.72.040 — Variance findings.
• § 17.36.090 — Buffers, screening and yard standards where industrial/retail abut residential.
• Town density bonus & incentives (setbacks, lot coverage and height flexibility): § 17.136.050 and the Town Density Bonus program sections.

(These references are excerpts from the Town of Mammoth Lakes Title 17 Zoning Code obtained for this guidance.)

Retrieved passages

• Mammoth Lakes Zoning Code (§ 4) High relevance show source text
• Mammoth Lakes Zoning Code (Section 17.36.060.) High relevance show source text
• Mammoth Lakes Zoning Code High relevance show source text
• Mammoth Lakes Zoning Code High relevance show source text
• Mammoth Lakes Zoning Code High relevance show source text
• Mammoth Lakes Zoning Code (Section 17.36.060.) High relevance show source text
• Mammoth Lakes Zoning Code (chapter is) High relevance show source text
• Mammoth Lakes Zoning Code (chapter necessary) High relevance show source text

Cited sections

• Title 17 — ZONING (Town of Mammoth Lakes), general title and purpose. **§ 17.04.001**, **§ 17.04.010**. (Title 17)
• **§ 17.20.030** — Residential zoning districts development standards (Table 17.20.030: lot area, setbacks, lot coverage, density). (§ 17.20.030)
• **§ 17.36.100** — Setback requirements and exceptions. (§ 17.36.100)
• **§ 17.36.060** — Height measurement and height limit exceptions. (§ 17.36.060)
• **§ 17.52.055** — Accessory dwelling units (size, setbacks, lot coverage/FAR exceptions). (§ 17.52.055)
• **§ 17.32.080** — Planned residential development standards. (§ 17.32.080)
• **§ 17.76.020** — Director adjustments table and caps. (§ 17.76.020)
• **§ 17.72.040** — Variance findings. (§ 17.72.040)
• **§ 17.36.090** — Buffers, screening and yard standards where industrial/retail abut residential. (§ 17.36.090)
• Town density bonus & incentives (setbacks, lot coverage and height flexibility): **§ 17.136.050** and the Town Density Bonus program sections. (§ 17.136.050)
• MammothLakes_ZoningCode.md

• Official Mammoth Lakes code library