Local zoning · Larkspur

Larkspur — Development Standards

Development Standards under the Larkspur local zoning and planning code, with the controlling citations.

Ask a question free See coverage

Last reviewed: July 2, 2026

Overview

This page summarizes the development standards that control bulk, placement, and intensity of development in the City of Larkspur under Title 18 (Zoning). It is focused on the local rules for setbacks, height, lot coverage, density, and floor‑area ratio (FAR) by zoning district and related special rules (slope/hillside, ADUs, downtown districts). For rules about building construction standards, consult the California Building Standards Code. For procedural topics that this page does not cover (permits, fees, environmental review), start at the Larkspur zoning & planning overview.

Note: this page is grounded in the Larkspur Municipal Code, Title 18; each requirement below is cited to the controlling code section (§) and the retrieved file preview. Verify parcel‑specific interpretations with the City; where the code text was not available in the materials, I mark it "Not found in retrieved materials."

How to use the links I put in the text

District-by-district development standards

Below are the principal development controls you will use during early feasibility and design. I name the district as titled in Title 18 and cite the primary code sections that specify the numbers.

Notes on citations: I state the controlling code section (for example, § 18.20.050) and also include the file search preview marker returned from the ordinance export so you can find the source excerpt in the retrieved materials.

R-1 — First Residential District

  • Purpose & typical uses: One‑family dwellings, accessory structures, parks, group homes, transitional/supportive housing, and ADUs/JADUs per local ADU rules (§ 18.20.020) .
  • Key dimensional standards:
    • Maximum height of main structures: 30 ft (§ 18.20.040) .
    • Accessory structure height: 15 ft (§ 18.20.040) .
    • Maximum lot coverage: 40% (§ 18.20.050) .
    • Front yard (setback): 20 ft (§ 18.20.060) .
    • Maximum gross floor area is controlled by the residential FAR rules in § 18.35 (see FAR table) (§ 18.20.120) .
  • Where it applies: low‑density single‑family neighborhoods; see Title 18 index for district map references (§ 18.12.010) .

R-2 — Second Residential District

  • Purpose & typical uses: One‑ and two‑family dwellings, accessory uses, parks, group and family day care; ADUs allowed under Chapter 18.23 (§ 18.28.020) .
  • Key dimensional standards:
    • Base FAR (Table 35‑1): 0.50 base, minimum 0.15 (§ 18.35.040 / Table 35‑1) .
    • Lot area, building height, lot coverage and yard rules are in the R‑2 chapter (see §§ 18.28.030–18.28.060) — these define minimum lot area, height limits, and coverage in the district (§ 18.28.030 et seq.) .
    • For sloping lots, FAR reductions apply for slopes above 10% (§ 18.35.040(B)(1)) .

R-3 — Third Residential District

  • Purpose & typical uses: Higher density multifamily: multiple dwellings, condos; usable open area standards for multifamily (§ 18.32.020, § 18.32.120) .
  • Key dimensional standards:
    • Base FAR (Table 35‑1): 0.60 base, minimum 0.055 (§ 18.35.040 / Table 35‑1) .
    • Maximum building height for R‑3 structures: 35 ft (one- and two‑family and multiple dwellings) (§ 18.32.040) .
    • Lot coverage: 50% maximum (§ 18.32.050) .
    • Yards / setbacks: front 15 ft, side and rear per § 18.32.060; see § 18.32.060 for detail. .
    • Special usability standards (private/common outdoor area) apply to multifamily (§ 18.32.120) .

T-R — Tidelands Residential District

  • Purpose & typical uses: single‑family housing on tidelands; tailored lot, elevation and flood‑sensitive standards (§ 18.22.005–18.22.060) .
  • Key dimensional standards:
    • Height: generally one story / 15 ft maximum (§ 18.22.040) .
    • Lot coverage: 40% or 3,500 sq ft, whichever is more restrictive (§ 18.22.050) .
    • Yards: front 20 ft, side 6 ft (smaller lots may have 5 ft), rear 6 ft (§ 18.22.060) .
  • Applies to the tidelands neighborhoods mapped by the district map (§ 18.12.010) .

SD — Storefront Downtown District

  • Purpose & typical uses: downtown storefront commercial with upper‑story housing; mixed‑use priorities (see § 18.41.010 et seq.) .
  • Key dimensional standards:
    • Lot coverage: no lot coverage requirement in SD (§ 18.41.060) .
    • FAR: 0.80 maximum (§ 18.41.070) .
    • Front yards: generally none; special Magnolia Avenue rules require zero front setback on certain frontages (§ 18.41.090) .

TD — Transitional Downtown District

  • Purpose & typical uses: an intermediate downtown zone permitting commercial and some residential intensities (§ 18.45 series) .
  • Key dimensional standards:
    • FAR: 0.40 maximum (§ 18.45.070) .
    • Lot coverage: no lot coverage requirement (§ 18.45.060) .
    • Typical height limit: 25 ft or two stories (see § 18.45.050) with exceptions processed by Planning Commission (§ 18.45.050) .

C-2 — Commercial District

  • Purpose & typical uses: retail, offices, mixed‑use; multifamily allowed as specified (§ 18.48.020) .
  • Key dimensional standards:
    • Height: generally 25 ft or two stories (§ 18.48.040) with exception findings (§ 18.48.040(A)) .
    • Lot coverage: no lot coverage requirement for C‑2 (§ 18.48.050) .
    • FAR: 0.40 maximum (§ 18.48.055) with exemptions for residential over commercial (§ 18.48.055(A)) .
    • Yards: front none generally; multiple dwelling setbacks default to R‑3 rules (§ 18.48.060) .

MHP — Mobile Home Park District

  • Key dimensional standards:
    • Building height: one story / 14 ft for mobile homes (§ 18.30.060(B)) .
    • Minimum park size: 2 acres for a new park (§ 18.30.060(A)) .

Planned Development (P‑D) and Housing Priority Overlay

  • P‑D establishes site‑specific standards; where P‑D is used the applicable district standards for the most similar use normally apply (R‑1 for detached single‑family, R‑2 for duplexes, R‑3 for multifamily) (§ 18.55.030(C)) .
  • The Housing Priority Overlay and the Housing Element-specific chapters can override base zoning density and impose site‑specific standards; see Chapter 18.101 for those sites and standards (§ 18.101 series).

Development‑standards summary table (quick reference)

District Typical permitted uses (pct) Height Lot coverage FAR / Density Key code reference
R‑1 Single‑family, ADUs 30 ft (main); 15 ft accessory 40% FAR per Table 35‑1 (R‑1 0.40) § 18.20.020, § 18.20.040, § 18.20.050, § 18.20.120
R‑2 One-/two‑family, ADUs District chapter controls District chapter controls Base FAR 0.50 (Table 35‑1) §§ 18.28.020–060, § 18.35.040
R‑3 Multifamily 35 ft 50% Base FAR 0.60 §§ 18.32.020–060, § 18.32.040, § 18.32.050, § 18.35.040
T‑R Tidelands single‑family 15 ft / 1 story 40% or 3,500 sq ft District lot rules §§ 18.22.030–060
SD Downtown storefronts, mixed use See district No coverage requirement FAR 0.80 §§ 18.41.060–070
TD Transitional downtown See district No coverage requirement FAR 0.40 §§ 18.45.060–070
C‑2 Commercial / mixed use 25 ft / 2 stories typical No coverage requirement FAR 0.40 (residential exceptions) §§ 18.48.040–055

(For detailed yard/setback tables, special frontage rules on Magnolia Avenue, and other site‑specific frontages, consult the district text cited above.)

Rules that frequently interact with the dimensional standards

  • Floor area control: Residential FAR rules are in Chapter 18.35 (Table 35‑1 gives base FARs and minimums; slope adjustments for sloping lots are specified) (§ 18.35.040) .
  • Slope/hillside rules: preservation of natural/permeable area and slope‑based reductions in density and FAR are in Chapter 18.34 (e.g., minimum natural state/permeable area formula and allowance for slope‑based FAR reductions for R districts) (§ 18.34.080, § 18.34.100) .
  • ADUs: State‑aligned ADU rules and local implementation are in Chapter 18.23; typical by‑right ADU allowances (including 4‑ft side/rear setbacks for detached ADUs and detached ADU height caps of 16/18/20 ft depending on circumstances) are in § 18.23.050–060. ADU by‑right standards reduce local discretion in many cases (§ 18.23.050–060) .
  • Design review: many additions and new buildings are subject to Chapter 18.64 design review; smaller projects or objective‑standards projects may be ministerial (§ 18.20.085, § 18.64 series) .
  • Parking: off‑street parking standards are in Chapter 18.56 and are invoked whenever a new dwelling or use is proposed (see cross‑references in the district chapters) (§ 18.20.100, § 18.32.100) .

Checklist

Applicant must confirm the following before filing complete plans:

  • Determine the property’s zoning district (Title 18 index) and applicable base chapter (§ 18.12.010) .
  • Confirm permitted uses in the district and whether a use permit is required (§ district‑specific permitted/conditional uses; e.g., § 18.20.020, § 18.28.020, § 18.32.020) .
  • Verify height, lot coverage, front/side/rear setbacks in the district (§ 18.20–18.32 series as applicable) .
  • Calculate FAR and maximum gross floor area using Chapter 18.35 (including slope adjustments where average slope >10%) (§ 18.35.040) .
  • Check slope/hillside controls (natural/permeable area minimums and grading limits) in Chapter 18.34 (§ 18.34.080, § 18.34.090) .
  • ADUs: if proposing ADUs, follow Chapter 18.23 (maximum sizes, setbacks, parking exemptions) and applicable state ADU law; see the City’s ADU rules and the California ADU law references (§ 18.23.050–060) .
  • Determine off‑street parking impact (Chapter 18.56) and whether exemptions apply (ADU exemptions, transit proximity) — see Larkspur Parking (§ 18.20.100, § 18.23) .
  • Confirm whether the project is subject to design review under Chapter 18.64 or is eligible for objective‑standards ministerial approval (§ 18.20.085, § 18.64.025) .

Risks & Ambiguities

Issue Why it matters What to verify
Slope/FAR interaction For lots with average slopes >10% the allowable FAR reduces and natural‑state permeable area increases, which can shrink buildable area (§ 18.35.040(B), § 18.34.080) Calculate average slope per § 18.34.030 and run the FAR from Table 35‑1/35‑2; verify with Planning.
ADU vs. lot coverage counting ADU lot coverage may be treated differently for encouragement purposes; the ordinance allows increasing a lot’s maximum coverage by up to 800 sq ft to accommodate qualifying ADUs—this affects primary residence expansions (§ 18.20.050(B), § 18.34.080(C)) Confirm ADU size & date of construction and whether the ADU meets the qualifying conditions before relying on the coverage increase.
Downtown frontage exceptions SD and TD districts have unusual zero‑frontage or no coverage rules but may have site‑specific Magnolia Avenue or wetland setbacks (e.g., 20 ft to wetlands) (§ 18.41.090, § 18.101.090) Check site‑specific standards in the district text and the Larkspur zoning map; verify any site table rows in § 18.101 for Housing Element sites.
Nonconforming FAR/building reconstruction Some existing buildings exceeding FAR are allowed to be reconstructed to original size if certain conditions are met — this affects envelope plans and entitlements (§ 18.41.070, § 18.45.070) Verify historical records/documentation and whether a discretionary permit is needed for reconstruction.
Multiple cross‑references (parking, design review, building code) District chapters cross‑refer to Chapters 18.56 (parking), 18.64 (design review), and Title 20 objective design standards; inconsistent assumptions can delay submittals. (§ 18.20.100, § 18.20.085) Confirm all cross‑chapter requirements early (parking counts, design review thresholds) and coordinate with Planning and Public Works.

Plain-English Summary

If you own a Larkspur lot, the City’s zoning chapters in Title 18 tell you how big and tall you can build (district‑by‑district height, setbacks, lot coverage) and how much total floor area (FAR) you may add; for sloping lots, special slope rules reduce allowable FAR and increase required permeable area; ADUs are governed by Chapter 18.23 with separate size/setback/parking rules. Always check the exact district chapter and Chapter 18.35 for FAR and Chapter 18.34 for hillside rules before designing.

Source References

  • Larkspur Municipal Code, Title 18 — Index and district list; see Title 18 index and district designations. § 18.12.010
  • R‑1 (First Residential) regulations: §§ 18.20.005–18.20.130 (permitted uses, height, coverage, yards) (§ 18.20.020, § 18.20.040, § 18.20.050, § 18.20.060)
  • R‑2 (Second Residential) regulations: Chapter 18.28, §§ 18.28.020–18.28.060 (permitted uses, lot area, height, coverage)
  • R‑3 (Third Residential) regulations: Chapter 18.32, §§ 18.32.020–18.32.140 (multifamily standards, coverage, height, usable outdoor area) (§ 18.32.040, § 18.32.050, § 18.32.120)
  • Residential FAR: Chapter 18.35, § 18.35.040 (Table 35‑1 FARs; slope adjustments and Table 35‑2 for R‑3)
  • Slope / Hillside rules and permeable area requirements: Chapter 18.34 (e.g., § 18.34.080, § 18.34.100, § 18.34.110)
  • ADU rules: Chapter 18.23 (standards, by‑right ADUs, setbacks, heights, parking exemptions) (§ 18.23.050–060)
  • SD and TD downtown rules: Chapters 18.41 and 18.45 (lot coverage, FAR, special frontage rules) (§ 18.41.060–070, § 18.45.060–070)
  • C‑2 Commercial: Chapter 18.48 (permitted uses, height, FAR) (§ 18.48.020, § 18.48.040, § 18.48.055)
  • MHP (Mobile Home Park) rules: Chapter 18.30, § 18.30.060 (density, height, landscaping)
  • Design review: Chapter 18.64 (design review triggers and review authorities) (§ 18.64.025, § 18.64.030)
  • Cross‑references to parking: Chapter 18.56 (district chapters refer to it for off‑street parking requirements; e.g., § 18.20.100)

City website (official source): City of Larkspur homepage — www.cityoflarkspur.org (official municipal code hosted via General Code)

Sources

Retrieved passages

  • Larkspur Zoning Code (Chapter 18.35) High relevance
  • Larkspur Zoning Code (§ 2) High relevance
  • CBC § 5 (Section 18.23.070.) High relevance
  • Larkspur Zoning Code (§ 2) High relevance
  • CBC § 5 (Title 18) High relevance
  • Larkspur Zoning Code (Section 18.41.150) High relevance
  • Larkspur Zoning Code (§ 9) High relevance
  • CBC § 18.23.050 (Section 18.23.050.) High relevance
  • Larkspur Zoning Code (Title 18) High relevance
  • CFC § 3 (Title 20) High relevance
  • Larkspur Zoning Code (Section 18.34.030.) High relevance
  • Larkspur Zoning Code (Title 18) High relevance
  • Larkspur Zoning Code (§ 2) High relevance
  • CBC § 66314 (§ 66314) High relevance
  • Larkspur Zoning Code (Title 18) High relevance
  • Larkspur Zoning Code (section shall) High relevance
  • Larkspur Zoning Code (§ 2) High relevance
  • Larkspur Zoning Code (Chapter 17.13.) High relevance
  • Larkspur Zoning Code (Title 18) High relevance
  • Larkspur Zoning Code (chapter are) High relevance
  • Larkspur Zoning Code (Title 18) High relevance

Cited sections

Frequently asked questions

What can I build on an R-1 lot in Larkspur?

You can build a one‑family dwelling and customary accessory uses; ADUs/JADUs are allowed subject to Chapter 18.23. Height, coverage and yard limits for R‑1 control the size and placement (see §§ 18.20.020, 18.20.040, 18.20.050, 18.20.060) .

What are Larkspur setback requirements for single‑family zones?

Setbacks are set in each district chapter; for R‑1 the front yard is 20 ft and district chapters spell out side/rear requirements (§ 18.20.060). Tidelands (T‑R) and multi‑family districts have different setback rules — always check the district chapter for the parcel.

How is floor area (FAR) calculated and what are the base FARs?

Residential FARs are in Chapter 18.35. Table 35‑1 lists base FARs: R‑1 = 0.40, R‑2 = 0.50, R‑3 = 0.60; slopes greater than 10% reduce allowable FAR per the chapter rules (§ 18.35.040) .

Do I need design review for a second‑story addition?

Many exterior changes are subject to Chapter 18.64 design review. Some small additions may be ministerial or handled by the Zoning Administrator; see the specific thresholds in § 18.64.025 and the district’s design review cross‑references (§ 18.20.085) .

What are Larkspur’s ADU setbacks, heights, and parking rules?

ADUs are governed by Chapter 18.23. Typical detached ADU side/rear setbacks are 4 ft; detached ADU height caps are commonly 16/18/20 ft depending on context; many ADUs qualify for parking exemptions in certain situations (§ 18.23.050–060) .

How do slope and hillside rules affect building size?

For parcels with average slope ≥10%, Chapter 18.34 applies: required minimum natural/permeable areas increase and the FAR entitlement often decreases (see slope adjustments in § 18.35.040(B) and natural state rules in § 18.34.080) .

Are there lot coverage limits in downtown Larkspur?

In many downtown zones like SD and TD, the code states no lot coverage requirement; however FAR, frontage rules (e.g., zero front setback in parts of Magnolia Avenue), and other site-specific constraints still control bulk and placement (see §§ 18.41.060–070, 18.45.060–070) .

Can an existing building that exceeds current FAR be reconstructed?

Yes — certain district chapters allow reconstruction to the building’s original size if the new work meets conditions including documentation and obtaining any required discretionary permits (see district FAR provisions such as § 18.41.070 and § 18.48.055) .

Do the district height limits allow exceptions?

District chapters provide exception processes (frequently via Planning Commission findings) for height increases; these exceptions require affirmative findings regarding neighborhood compatibility and impacts (see e.g., § 18.20.040 and § 18.48.040) .

Where do I check for parcel‑specific overlay rules or Housing Element site standards?

Overlay and site‑specific standards are in the applicable overlay chapter (e.g., Housing Priority Overlay / Chapter 18.101) and in the Larkspur Overlay Districts materials; site tables and special setbacks (e.g., wetland setbacks) are in § 18.101 as applicable. ---

More in Larkspur code

Ask about any Larkspur property

Get a cited, plain-English answer on Larkspur zoning, setbacks, FAR, ADUs and permits — for any address.

Start Free Trial

More Larkspur zoning topics

Larkspur Zoning

Larkspur Land Use

Larkspur Parking

Larkspur Design Review

Larkspur Overlay Districts

Larkspur Historic Preservation

Larkspur Signage

Larkspur Nonconforming Uses

Larkspur Variances and Exceptions

Larkspur Landscaping and Screening

Larkspur overview