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Title 18 — Zoning

Chapter 18.542 — SPECIFIC PLAN NO. 25

San Dimas Zoning Code · 2026-06 edition · updated 2026-07-06 · San Dimas

§ 18.542.010. Purpose and intent.

  • A. Responsible development of the Northern Foothills of the city can be ensured through the adoption of a development control mechanism that reflects thorough and comprehensive land use planning. The most suitable development control mechanism is the specific plan, which when adopted, serves both a planning function and a regulatory function.

  • B. The purpose of Specific Plan No. 25 is to provide for managing environmental values and future development within the northern foothills area in order to protect the area's natural environment and existing resources and to ensure that the design of future hillside developments preserves sensitive resources in place, considers the natural hillside topography and maximizes view opportunities to, as well as from, the developments. Overall, the strategy encourages fitting projects into their hillside setting rather than altering the hillside to fit the project. Thus, although individual property rights within the northern foothills area must be recognized, the priority between development and natural resource values should be balanced.

  • C. Specific Plan No. 25 establishes the type, location, intensity and character of development to take place. It functions as a general blueprint of future development, focusing on the physical

characteristics of the site and integration of the same with surrounding uses.

  • D. Development standards are proposed to achieve the following objectives:

    1. To minimize alterations to the natural terrain, not only to preserve natural environmental features, but also to protect residents' health and safety within nearby developed areas;

    2. To provide an enriched low density residential environment with aesthetic cohesiveness, harmonious massing of structures, and interfacing of open space through the utilization of superior land planning and design;

    3. To minimize the impact of new development into the surrounding viewshed, especially as seen from public intersection viewpoints in the city;

    4. To utilize current practices of good design, architecture, landscape architecture, civil engineering, and hillside land planning to preserve, enhance and promote the existing and future appearance and resources of hillside areas;

    5. To protect public health and safety from the potential damaging effect of hillside alteration and to minimize conventional flat land development practices, except in clustered developments;

    6. To provide for the planning, design and development of single-family residences that provide ample safety with respect to fire hazards, exposure to geological and geotechnical hazards, drainage and erosion;

    7. To maximize preservation of the area's natural environment, recognize the opportunities and constraints that the land itself imposes, and accommodate such development as can be designed to minimize impacts on the natural environment and protect the public health and safety;

    8. To provide a safe means of ingress/egress for vehicular, equestrian and pedestrian traffic to and within the northern foothills with a minimum disturbance to the natural terrain;

  1. To preserve natural landforms in order to recognize and live within the limits placed by natural environmental constraints;

    1. To facilitate development within the northern foothills which is rural in character and which contributes to the open space character of the area.
  • (Ord. 1106 § 1, 1999; Ord. 1201 § 1, 2011)

§ 18.542.020. Authority and scope.

The adoption of Specific Plan No. 25 by the city is authorized by the California Government Code Title 7, Divisional Chapter 3, Articles 8 and 9, Sections 65450 through 65507. (Ord. 1106 § 1, 1999)

§ 18.542.030. Location.

Specific Plan No. 25 only applies to that property within the city indicated on Exhibit A attached to and located at the end of this chapter.

(Ord. 1106 § 1, 1999)

§ 18.542.040. General notes and conditions.

  • A. Unless otherwise specified, all uses and development within Specific Plan No. 25 shall comply with the provisions of this code. Terms used in this chapter shall have the same meaning as defined in this code unless otherwise defined in this chapter.

  • B. Any details or issues not specifically covered in the specific plan shall be subject to the regulations of this code.

  • C. The approval of uses and development within the specific plan area shall be governed by Section 65450 et seq., of the Government Code.

  • D. All construction within the boundaries of this specific plan area shall comply with all provisions of the building code and the various mechanical, electrical and plumbing codes adopted by the city.

  • E. Minor modifications to the specific plan, which do not give rise to a conflict with the intent of the specific plan as approved, may be approved by the director of planning at his or her discretion.

  • F. A program environmental impact report which analyzes the "worst case" scenario for possible build-out and public improvements and for the cumulative impacts, which may occur by subsequent implementation of the specific plan, has been certified by the city council and is referenced by this section. This environmental impact report will be utilized as a master CEQA clearance document for future focused studies, if determined necessary by the city, which will tier off of the program environmental impact report in accordance with Section 15152 of CEQA Guidelines, as amended.

  • G. Any land use not specifically authorized by Specific Plan No. 25 shall not be permitted.

  • H. If any regulation, condition, program or portion thereof of the specific plan is for any reason held invalid or unconstitutional by any court of competent jurisdiction, such portion shall be deemed a separate, distinct and independent provision and the invalidity of such section shall not affect the validity of the remaining provisions thereof.

  • (Ord. 1106 § 1, 1999)

§ 18.542.050. Definitions.

"Average slope" means the average slope in a given geographical area as determined according to the following formula:

  • S = 2.29 x 10-3 I L / A

S = Average slope percent

  • A = Total acreage of the area being measured

L = Length of each of the contours, in feet (with appropriate scale), within the area being measured

I = Contour intervals, in feet

"Natural slope" means the vertical change in elevation over a given horizontal distance prior to grading or any alteration.

"Landform grading" means a contour grading method which creates artificial slopes with curves and varying slope ratios in the horizontal and vertical planes designed to simulate the appearance of surrounding natural terrain.

"Rural" means a way of life characterized by living in an area with few people; a natural, peaceful, quiet setting; allowance for a sense of solitude; and, unhindered views of stars in the night sky. Rural areas are unencumbered by typical urban/suburban facilities, including: curbs, gutters and sidewalks; street lighting except where needed for safety purposes; formal, manicured landscaping; and commercial facilities.

"Clustered lots" mean four or more lots, not less than one-half acre in size, sharing a common road or driveway access.

(Ord. 1106 § 1, 1999; Ord. 1201 § 1, 2011)

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Contents — San Dimas Zoning Code
San Dimas Zoning Code
  1. Title 18 — Zoning
    Overview
    1. Chapter 18.04 — GENERAL PROVISIONS
    2. Chapter 18.08 — DEFINITIONS
    3. Chapter 18.12 — DEVELOPMENT PLAN REVIEW
    4. Chapter 18.14 — WATER-EFFICIENT LANDSCAPES
    5. Chapter 18.16 — ZONING DISTRICTS, MAPS AND BOUNDARIES
    6. Chapter 18.20 — RESIDENTIAL ZONES GENERALLY
    7. Chapter 18.22 — DENSITY BONUS
    8. Chapter 18.24 — S-F SINGLE-FAMILY RESIDENTIAL ZONE
    9. Chapter 18.26 — DEVELOPMENT STANDARDS OVERLAY ZONE
    10. Chapter 18.28 — SF-A SINGLE-FAMILY AGRICULTURE ZONE
    11. Chapter 18.32 — SF-H SINGLE-FAMILY HILLSIDE ZONE
    12. Chapter 18.35 — SF-DR SINGLE-FAMILY DOWNTOWN RESIDENTIAL ZONE
    13. Chapter 18.38 — ACCESSORY DWELLING UNITS
    14. Chapter 18.40 — AFFORDABLE HOUSING OVERLAY ZONE
    15. Chapter 18.42 — MULTIPLE-FAMILY (MF) ZONE
    16. Chapter 18.44 — MULTIPLE-FAMILY THIRTY UNITS PER ACRE (MF-30) …
    17. Chapter 18.48 — MF-D MULTIPLE-FAMILY ZONE— DUPLEX
    18. Chapter 18.50 — DOWNTOWN SPECIFIC PLAN
    19. Chapter 18.52 — RPD RESIDENTIAL PLANNED DEVELOPMENT ZONE
    20. Chapter 18.64 — A-L LIGHT AGRICULTURAL ZONE
    21. Chapter 18.92 — C-H COMMERCIAL-HIGHWAY ZONE
    22. Chapter 18.96 — C-N COMMERCIAL-NEIGHBORHOOD ZONE
    23. Chapter 18.104 — CPO COMMUNITY PARKING OVERLAY ZONE
    24. Chapter 18.108 — SCENIC HIGHWAY OVERLAY ZONE
    25. Chapter 18.112 — P-H PRIVATE HORSE OVERLAY ZONE
    26. Chapter 18.116 — CONSERVATION OVERLAY ZONE
    27. Chapter 18.122 — MOBILE HOME PARK ZONE
    28. Chapter 18.124 — OS OPEN SPACE ZONE
    29. Chapter 18.128 — INDUSTRIAL ZONES
    30. Chapter 18.132 — PS PUBLIC/SEMIPUBLIC ZONE
    31. Chapter 18.136 — A-P ADMINISTRATIVE PROFESSIONAL ZONE
    32. Chapter 18.140 — C-G CREATIVE-GROWTH ZONE
    33. Chapter 18.142 — DEVELOPMENT STANDARDS FOR SPECIFIC LAND USES
    34. Chapter 18.150 — WIRELESS COMMUNICATION FACILITIES
    35. Chapter 18.152 — SIGNS
    36. Chapter 18.156 — VEHICLE PARKING AND STORAGE
    37. Chapter 18.162 — TREE PRESERVATION
    38. Chapter 18.164 — HILLSIDE DEVELOPMENT
    39. Chapter 18.168 — ALTERNATIVE ENERGY SYSTEMS
    40. Chapter 18.170 — ELECTRIC VEHICLE CHARGING STATIONS
    41. Chapter 18.172 — PUBLICLY OWNED PROPERTY
    42. Chapter 18.180 — FLOOD CONTROL
    43. Chapter 18.184 — HOME BASED BUSINESSES
    44. Chapter 18.186 — RESERVED
    45. Chapter 18.188 — RESERVED
    46. Chapter 18.190 — SEXUALLY ORIENTED BUSINESSES
    47. Chapter 18.192 — UNCLASSIFIED USES
    48. Chapter 18.194 — MARIJUANA AND MEDICAL MARIJUANA
    49. Chapter 18.196 — TEMPORARY USES
    50. Chapter 18.198 — RECYCLING FACILITIES, DONATION BOXES AND NON-…
    51. Chapter 18.200 — CONDITIONAL USE PERMITS
    52. Chapter 18.204 — VARIANCES
    53. Chapter 18.208 — ZONE CHANGES AND AMENDMENTS
    54. Chapter 18.212 — APPEAL PROCEDURES
    55. Chapter 18.500 — SPECIFIC PLAN NO. 2
    56. Chapter 18.502 — SPECIFIC PLAN NO. 3
    57. Chapter 18.504 — SPECIFIC PLAN NO. 4
    58. Chapter 18.508 — SPECIFIC PLAN NO. 6
    59. Chapter 18.510 — SPECIFIC PLAN NO. 7
    60. Chapter 18.512 — SPECIFIC PLAN NO. 8
    61. Chapter 18.514 — SPECIFIC PLAN NO. 9
    62. Chapter 18.516 — SPECIFIC PLAN NO. 10
    63. Chapter 18.518 — SPECIFIC PLAN NO. 11
    64. Chapter 18.520 — SPECIFIC PLAN NO. 12
    65. Chapter 18.522 — SPECIFIC PLAN NO. 13
    66. Chapter 18.526 — SPECIFIC PLAN NO. 16
    67. Chapter 18.528 — SPECIFIC PLAN NO. 17
    68. Chapter 18.532 — SPECIFIC PLAN NO. 20
    69. Chapter 18.534 — SPECIFIC PLAN NO. 21
    70. Chapter 18.536 — SPECIFIC PLAN NO. 22
    71. Chapter 18.538 — SPECIFIC PLAN NO. 23
    72. Chapter 18.540 — SPECIFIC PLAN NO. 24
    73. Chapter 18.542 — SPECIFIC PLAN NO. 25

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