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Larkspur City Zoning Code

18.20 R-1

First Residential District Regulations

18.20.005 Purpose.

The purpose of the First Residential Zoning District is:

A. To provide for the low-density residential areas as set forth in the Larkspur General Plan.

B. Protect existing single-family dwellings and encourage the development of new single-family neighborhoods in an environment free from excessive levels of noise, illumination and glare, air pollution, heat, vibration and other objectionable impacts.

C. Ensure that each dwelling has sufficient access to light, air, open space, and insolation and is provided with adequate privacy.

D. Accommodate community facilities, schools, religious institutions, recreation facilities, open space and public services needed to complement the residential uses of the district.

E. Ensure that the density of proposed developments is compatible with the capacity of existing utilities and road systems serving the area.

F. Ensure that the size and scale of proposed structures are compatible with adjacent structures and the physical setting. (Ord. 1030 § 2(12), 2018; Ord. 640 § 1, 1980)

18.20.010 Regulations Established.

The regulations in this chapter are applicable to properties zoned First Residential and are in addition to the regulations set forth in Larkspur Municipal Code Chapter 18.16. (Ord. 1030 § 2(12), 2018; Ord. 295 § 40, 1962)

18.20.020 Permitted Uses.

The following uses are permitted in the R-1 District:

A. One-family dwellings.

B. Accessory structures and uses (including home occupations).

C. Public parks and playgrounds, including recreation, refreshment and service buildings.

D. Group homes.

E. Transitional and supportive housing.

F. Residential care facilities.

G. Accessory dwelling units and junior accessory dwelling units, subject to the provisions of Larkspur Municipal Code Chapter 18.23.

H. Family day care homes.65863.2

I. Housing development projects, as defined in California Government Code Section 65589.5, meeting the criteria of California Government Code Section 65913.16, the Affordable Housing on Faith and Higher Education Lands Act of 2023, so long as Section 65913.16 remains in effect. (Ord. 1077 § 5, 2024; Ord. 1071 § 9, 2023; Ord. 1030 § 2(12), 2018; Ord. 1012 § 4, 2016; Ord. 921 § 2, 2003; Ord. 855 § 9, 1993; Ord. 538 § 1, 1975; Ord. 392 § 1, 1970; Ord. 295 § 41, 1962)

18.20.025 Conditional Uses.

The following uses are permitted in the R-1 District subject to securing a use permit in each case:

A. Churches.

B. Colleges and schools (not including riding schools and riding academies) and the operation of necessary facilities and required equipment.

C. Community clubhouses.

D. Reserved.

E. Public utility or public service uses or public buildings.

F. Day care center.

G. Mobilehome park as defined in California Health and Safety Code Section 18214.

H. Repealed by Ord. 921.

I. Bed-and-breakfast inns, incidental to the residential use, for maximum accommodation of four (4) guests in two (2) rooms; provided, that:

1. The structure is a minimum of two thousand five hundred (2,500) square feet, excluding garages, and has been determined to be a significant historic resource, as defined by Larkspur Municipal Code Section 18.19.020. Any proposed exterior building improvements must receive prior approval from the Heritage Preservation Committee and the Planning Commission pursuant to Larkspur Municipal Code Sections 18.19.040 and 18.19.050. All such improvements shall be completed prior to issuance of an occupancy permit.

2. All required parking shall be provided on site.

3. The property must take access from a major vehicular thoroughfare and be sufficiently large to provide adequate internal vehicular circulation and safe ingress and egress.

4. The property must be situated within three hundred (300) feet of a commercial zone.

5. Adequate sound and light buffering must be provided between the subject structure/parking areas, and contiguous residential structures, as determined by the Planning Commission.

6. Site illumination shall be kept to a safe minimum and shall receive Planning Commission approval prior to installation.

7. On-site signing shall be limited to that provided for residential home occupations as specified in Larkspur Municipal Code Section 18.60.090.

8. A bed-and-breakfast use permit shall be voided upon the sale or transfer of the property ownership.

9. Occupancy by owner:

a. The property in question must be the principal residence of the owner. Said owner-occupant shall be the record owner of no less than fifty (50) percent interest of the property in question.

b. When application is made for a business license to operate the bed-and-breakfast inn, the applicant must prove to the satisfaction of the City that they hold at least a fifty (50) percent interest in the property. The business license shall be conditioned upon the property owner maintaining at least a fifty (50) percent interest in the property. The business license and the use permit may be revoked by the City if this condition is violated or if there is a transfer of the title.

10. Special Gatherings. Renting of bed-and-breakfast facilities for a special gathering (e.g., wedding reception, party) shall be prohibited in the R-1 and R-2 zoning districts. Such gatherings will be allowed in the R-3 zone subject to Planning Commission approval in each case.

J. Having, keeping, maintaining, or boarding of four (4) or more dogs over four (4) months of age. (Ord. 1071 § 9, 2023; Ord. 1069 § 6, 2023; Ord. 1062 § 14, 2022; Ord. 1030 § 2(12), 2018; Ord. 921 § 3, 2003; Ord. 855 §§ 8, 9 (part), 1993; Ord. 787 § 1, 1989; Ord. 703 § 2, 1983; Ord. 698 § 3, 1983; Ord. 538 § 2, 1975)

18.20.030 Lot Area Required.

A. Each permitted use, other than an accessory use, shall be located on a lot having an area of no less than seven thousand five hundred (7,500) square feet and an average width of not less than sixty (60) feet; except that a permitted use may be located on a lot of record provided that all other regulations of the district shall be met.

B. No building shall be constructed on a lot unless said lot abuts for at least twenty (20) feet on a public street or has vehicular access to a public street by way of an easement not less than twenty (20) feet in width. (Ord. 1030 § 2(12), 2018; Ord. 313 § 6, 1965; Ord. 295 § 42, 1962)

18.20.040 Building Height Limit.

No main structure shall be erected to a height in excess of thirty (30) feet. No accessory structure shall be erected to a height in excess of fifteen (15) feet. (Ord. 1030 § 2(12), 2018; Ord. 824 § 2, 1992; Ord. 295 § 43, 1962)

18.20.050 Percentage of Lot Coverage.

A. Structures shall not cover more than forty (40) percent of the area of the lot on which they are situated. See also Larkspur Municipal Code Section 18.34.080, Preservation of Natural and Permeable Areas, for lots with an average slope of ten (10) percent or greater.

B. Pursuant to California Government Code Section 66321(b)(3), the limit on lot coverage shall not apply to an accessory dwelling unit (ADU) or junior accessory dwelling unit (JADU) that meets the standards in Larkspur Municipal Code Section 18.23.050. However, if an application for an ADU or JADU that meets the standards in Larkspur Municipal Code Section 18.23.050 is combined with an application to construct or expand the primary residence for purposes other than the ADU or JADU, or if such an ADU or JADU is constructed before the application to construct or expand the primary residence for unrelated reasons, the lot coverage added by the ADU or JADU would be counted in determining whether to allow the proposed new construction or expansion of the primary residence that is unrelated to the ADU or JADU. The resulting limit on construction and expansion of the primary residence would potentially discourage an application for and construction of an ADU or JADU. To instead encourage the construction of ADUs and JADUs, the maximum lot coverage for a lot based on the regulations for the zoning district (and not including any additional lot coverage granted by any exceptions or variances) may be increased by the number of square feet of the qualifying ADUs or JADUs, up to a maximum of eight hundred (800) square feet, for the purpose of constructing or expanding the primary residence, only under the conditions set forth in the following subsection. The foregoing shall not be applied in a way that would result in the applicable lot coverage standard limiting the size of an ADU or JADU that meets the standards in Larkspur Municipal Code Section 18.23.050; it shall limit the increase in size of the newly constructed or expanded primary structure on the same lot only.

C. To increase the lot coverage of a lot by the number of square feet of a qualifying ADU or JADU, up to a maximum of eight hundred (800) square feet, for the purpose of constructing or expanding the primary residence only, all of the following must be true:

1. The ADU or JADU must comply with the requirements of California Government Code Section 66321(b) and Larkspur Municipal Code Section 18.23.050.

2. The ADU or JADU must be constructed after July 1, 2023.

3. An application to construct or expand the primary residence on the lot must be submitted after the ADU or JADU is constructed or at the same time as the application for the ADU or JADU.

D. In the event that an ADU or JADU is modified so that it no longer complies with the requirements under Larkspur Municipal Code Section 18.23.050 or this section (e.g., removal of the kitchen) any necessary permits shall be obtained to remove or legalize the additional lot coverage of the primary residence. (Ord. 1090 § 3, 2025; Ord. 1077 § 15, 2024; Ord. 1066 § 3, 2023; Ord. 1030 § 2(12), 2018; Ord. 953 § 1(24), 2007; Ord. 295 § 44, 1962)

18.20.060 Yards Required for Main Structure.

A. Front Yard. Minimum depth of front yard shall be twenty (20) feet.

B. Side Yards. The street side of a corner lot shall have a width of not less than ten (10) feet. Other side yards shall each have a minimum width of six (6) feet, except that lots with an average width of less than sixty (60) feet shall have side yards of at least five (5) feet.

C. Rear Yard. Minimum depth of rear yard is fifteen (15) feet. (Ord. 1030 § 2(12), 2018; Ord. 313 § 7, 1965; Ord. 295 § 45, 1962)

18.20.070 Location of Accessory Structures.

Accessory structures may be built within yards as follows:

A. Front Yard. On other than the street side of a corner lot; in steep terrain, either a one-story carport or one-story residential garage (neither a part of the main building) not closer than three (3) feet to either the front lot line or the side lot line, with design review approval by the Zoning Administrator pursuant to Larkspur Municipal Code Section 18.64.020.

B. Side Yards. Not closer than ten (10) feet to the street side lot line of a corner lot. On other than street side of corner lots, not closer than five (5) feet to the side lot line.

C. Rear Yards. Not nearer than three (3) feet to any rear lot line. (Ord. 1030 § 2(12), 2018; Ord. 953 § 1(25), 2007; Ord. 929 § 19, 2004; Ord. 857 § 12, 1993; Ord. 295 § 46, 1962)

18.20.080 Floor Area Required.

Repealed by Ord. 1079.

18.20.085 Design Review, Objective Standards and Heritage Preservation Board Review.

All proposed new structures, additions, and other modifications to the exterior of a building shall be subject to the provisions of Larkspur Municipal Code Chapter 18.64, Design Review, and for those parcels in the Combining Heritage Preservation District, or for any building listed on the National Register or Larkspur’s Inventory of Historic Resources, review and recommendation by the Heritage Preservation Board, per Larkspur Municipal Code Chapter 18.19. All proposed new one (1) family dwellings that are exempt from the provisions of Larkspur Municipal Code Chapter 18.64 shall comply with Larkspur Municipal Code Title 20, Objective Design and Development Standards. (Ord. 1091 § 2, 2025; Ord. 1030 § 2(12), 2018; Ord. 953 § 1(26), 2007; Ord. 933 § 1, 2004)

18.20.090 Signs.

Signs shall be permitted only in accordance with Larkspur Municipal Code Chapter 18.60. (Ord. 1030 § 2(12), 2018; Ord. 352 § 2, 1968; Ord. 295 § 48, 1962)

18.20.100 Structural Alterations – Change in Parking Space Requirement.

When a new dwelling is constructed, or a main building is structurally altered or the use is substantially changed, the minimum number of off-street parking spaces to be provided on the lot shall be as indicated in Larkspur Municipal Code Chapter 18.56. (Ord. 1030 § 2(12), 2018; Ord. 953 § 1(27), 2007; Ord. 313 § 2, 1965; Ord. 295 § 49, 1962)

18.20.110 Slope and Hillside Development.

Any property or properties having an average percent of slope (as calculated pursuant to Larkspur Municipal Code Section 18.34.030) equal to or exceeding ten (10) percent shall be subject to the regulations set forth in Larkspur Municipal Code Chapter 18.34. (Ord. 1030 § 2(12), 2018; Ord. 471 § 1 (part), 1973)

18.20.120 Maximum Floor Area.

The maximum gross floor area for all properties in this district shall be as set forth in Larkspur Municipal Code Chapter 18.35, Residential Floor Area Ratios. (Ord. 1030 § 2(12), 2018; Ord. 687 § 1, 1983)

18.20.130 Circulation Assessment Permit.

The provisions of the circulation assessment permit, Larkspur Municipal Code Chapter 18.14, are applicable to properties in this zoning district. (Ord. 1030 § 2(12), 2018; Ord. 737 § 2, 1986)