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Chapter 11A — HOUSING ACCESSIBILITY

Section 1115A — EXTERIOR STAIRWAYS

2025 California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-07-29 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

1115A.1 General.

Exterior stairways serving buildings on a site containing covered multifamily dwelling units shall comply with this section.

1115A.2 Open risers. Open risers are not permitted on exterior stairways.

Exceptions:

1. An opening of not more than [1] / 2 inch (12.7 mm) may be permitted between the base of the riser and the tread.

2. Risers constructed of grating containing openings of not more than [1] / 2 inch (12.7 mm) may be permitted.

1115A.3 Treads.

All tread surfaces shall be stable, firm and slip resistant, and shall comply with Section 1110A.3. Treads shall have smooth, rounded or chamfered exposed edges, and no abrupt edges at the nosing (lower front edge).

1115A.4 Nosing.

Nosing shall not project more than 1 [1] / 4 inches (31.8 mm) past the face of the riser below. Risers shall be sloped or the underside of the nosing shall have an angle not more than 30 degrees (0.52 rad) from the vertical. (See Figure 11A-6A).

1115A.5 Striping for the visually impaired.

Exterior stairs serving buildings on a site containing multifamily dwelling units shall have the upper approach and all treads marked by a stripe providing clear visual contrast.

The stripe shall be a minimum of 2 inches (50.8 mm) wide to a maximum of 4 inches (101.6 mm) wide placed parallel to, and not more than 1 inch (25.4 mm) from, the nose of the step or upper approach. The stripe shall extend the full width of the step or upper approach and shall be of material that is at least as slip resistant as the other treads of the stair. A painted stripe shall be acceptable. Grooves shall not be used to satisfy this requirement.

1115A.6 Exterior stairway handrails.

1115A.6.1 Where required. Stairways shall have handrails on each side. Intermediate handrails shall be located equidistant from the sides of the stairway and comply with Section 1014.9.

Exception: Stairways serving an individual dwelling unit may have one handrail, except that stairways open on one or both sides shall have handrails on the open side or sides.

1115A.6.2 Handrail configuration.

1115A.6.2.1 Handrail heights. The top of handrails shall be 34 to 38 inches (864 to 965 mm) above the nosing of the treads.

1115A.6.2.2 Handrail continuity. Handrails on all stairways shall be continuous within the full length of each stair flight. Inside handrails on switchback or dogleg stairs shall be continuous between stair flights.

1115A.6.2.3 Handrail extensions. At the top of stair flights, handrails shall extend a minimum of 12 inches (305 mm) horizontally above landings, beginning directly above the first riser nosing. Extensions shall return to a wall, guard or the walking surface, or shall be continuous to the handrail of an adjacent stair flight.

At the bottom of stair flights, handrails shall extend at the slope of the stair flight for a distance equal to one tread depth beyond the last riser nosing. Such extension shall continue with 12 inches (305 mm) minimum horizontal extension, shall be contin- uous to the handrail of an adjacent stair flight, or shall return to a wall, guard or the walking surface. Handrail horizontal extensions shall be in the same direction as the stair flights. (See Figures 11A-6A and 11A-6E.)

1115A.6.2.4 Handrail projections. Handrails projecting from a wall shall have a space of 1 [1] / 2 inches (38.1 mm) minimum between the wall and the handrail.

Handrails may be located in a recess if the recess is a maximum of 3 inches (76.2 mm) deep and extends at least 18 inches (457 mm) above the top of the rail. Any wall or other surface adjacent to the handrail shall be free of sharp or abrasive elements. (See Figure 11A-6B.)

1115A.6.2.5 Handrail gripping surfaces. Handrail gripping surfaces shall be continuous along their length, and shall not be obstructed along their tops or sides. The bottoms of handrail gripping surfaces shall not be obstructed for more than 20 percent of their length. When provided, horizontal projections shall occur 1 [1] / 2 inches (38.1 mm) minimum below the bottom of the handrail gripping surface. The distance between horizontal projections and the bottom of the gripping surface shall be permitted to be reduced by [1] / 8 inch (3.2 mm) for each [1] / 2 inch (12.7 mm) of additional handrail perimeter dimension that exceeds 4 inches (102 mm).

Handrail gripping surfaces and any surfaces adjacent to them shall be free of sharp or abrasive elements, and shall have rounded edges.

1115A.6.2.6 Cross section. Handrail gripping surfaces shall comply with this section, or the shape shall provide equivalent grip- ping surface.

1. Circular cross section. Handrail gripping surfaces with a circular cross section shall not be less than 1 [1] / 4 inches (31.75 mm) nor more than 2 inches (50.8 mm) in cross-sectional dimension.

2. Noncircular cross section. Handrail gripping surfaces with a noncircular cross section shall have a perimeter dimension of 4 inches (102 mm) minimum and 6 [1] / 4 inches (159 mm) maximum, and a cross-section dimension of 2 [1] / 4 inches (57 mm) maximum.

1115A.6.2.7 Fittings. Handrails shall not rotate within their fittings.

11A-12 2025 CALIFORNIA BUILDING CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

HOUSING ACCESSIBILITY

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▸ Contents — 2025 California Building Code (Title 24, Part 2)
2025 California Building Code (Title 24, Part 2)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — OCCUPANCY CLASSIFICATION AND USE
  4. Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY A…
  5. Chapter 5 — GENERAL BUILDING HEIGHTS AND AREAS
  6. Chapter 6 — TYPES OF CONSTRUCTION
  7. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  8. Chapter 7A — MATERIALS AND CONSTRUCTION METHODS FOR EXTERIOR W…
  9. Chapter 8 — INTERIOR FINISHES
  10. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  11. Chapter 10 — MEANS OF EGRESS
  12. Chapter 11 — RESERVED
  13. ▸ Chapter 11A — HOUSING ACCESSIBILITY
    Overview
    1. Section 1101A — APPLICATION
    2. Section 1102A — BUILDING ACCESSIBILITY
    3. Section 1103A — DESIGN AND CONSTRUCTION
    4. Section 1104A — COVERED MULTIFAMILY DWELLINGS
    5. Section 1105A — GARAGES, CARPORTS AND PARKING FACILITIES
    6. Section 1106A — SITE AND BUILDING CHARACTERISTICS
    7. Section 1107A — DEFINITIONS
    8. Section 1108A — GENERAL REQUIREMENTS FOR ACCESSIBLE PARKING AN…
    9. Section 1109A — PARKING FACILITIES
    10. Section 1110A — EXTERIOR ACCESSIBLE ROUTES
    11. Section 1111A — CHANGES IN LEVEL ON ACCESSIBLE ROUTES
    12. Section 1112A — CURB RAMPS ON ACCESSIBLE ROUTES
    13. Section 1113A — WALKS AND SIDEWALKS ON ACCESSIBLE ROUTES
    14. Section 1114A — EXTERIOR RAMPS AND LANDINGS ON ACCESSIBLE ROUTES
    15. Section 1115A — EXTERIOR STAIRWAYS
    16. Section 1116A — HAZARDS ON ACCESSIBLE ROUTES
    17. Section 1117A — GENERAL REQUIREMENTS FOR ACCESSIBLE ENTRANCES,…
    18. Section 1118A — EGRESS AND AREAS OF REFUGE
    19. Section 1119A — INTERIOR ACCESSIBLE ROUTES
    20. Section 1120A — RESERVED
    21. Section 1121A — CHANGES IN LEVEL ON ACCESSIBLE ROUTES
    22. Section 1122A — INTERIOR RAMPS AND LANDINGS ON ACCESSIBLE ROUTES
    23. Section 1123A — INTERIOR STAIRWAYS
    24. Section 1124A — ELEVATORS AND PLATFORM (WHEELCHAIR) LIFTS
    25. Section 1125A — HAZARDS ON ACCESSIBLE ROUTES
    26. Section 1126A — DOORS, GATES AND WINDOWS
    27. Section 1127A — COMMON USE FACILITIES
    28. Section 1128A — COVERED DWELLING UNITS
    29. Section 1129A — RESERVED
    30. Section 1130A — ACCESSIBLE ROUTE WITHIN COVERED MULTIFAMILY DW…
    31. Section 1131A — CHANGES IN LEVEL ON ACCESSIBLE ROUTES
    32. Section 1132A — DOORS
    33. Section 1133A — KITCHENS
    34. Section 1134A — BATHING AND TOILET FACILITIES
    35. Section 1135A — LAUNDRY ROOMS
    36. Section 1136A — ELECTRICAL RECEPTACLE, SWITCH AND CONTROL HEIG…
    37. Section 1137A — OTHER FEATURES AND FACILITIES
    38. Section 1138A — SPACE ALLOWANCES AND REACH RANGES
    39. Section 1139A — ACCESSIBLE DRINKING FOUNTAINS
    40. Section 1140A — ACCESSIBLE TELEPHONES
    41. Section 1141A — ACCESSIBLE SWIMMING POOLS
    42. Section 1142A — ELECTRICAL RECEPTACLE, SWITCH AND CONTROL HEIG…
    43. Section 1143A — SIGNAGE
    44. Section 1144A — RESERVED
    45. Section 1145A — RESERVED
    46. Section 1146A — RESERVED
    47. Section 1147A — RESERVED
    48. Section 1148A — RESERVED
    49. Section 1149A — RESERVED
    50. Section 1150A — SITE IMPRACTICALITY TESTS
  14. Chapter 11B — ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMM…
  15. Chapter 12 — INTERIOR ENVIRONMENT
  16. Chapter 13 — ENERGY EFFICIENCY
  17. Chapter 14 — EXTERIOR WALLS
  18. Chapter 15 — ROOF ASSEMBLIES AND ROOFTOP STRUCTURES
  19. Chapter 16 — STRUCTURAL DESIGN
  20. Chapter 16A — STRUCTURAL DESIGN
  21. Chapter 17 — SPECIAL INSPECTIONS AND TESTS
  22. Chapter 17A — SPECIAL INSPECTIONS AND TESTS
  23. Chapter 18 — SOILS AND FOUNDATIONS
  24. Chapter 18A — SOILS AND FOUNDATIONS
  25. Chapter 19 — CONCRETE
  26. Chapter 19A — CONCRETE
  27. Chapter 20 — ALUMINUM
  28. Chapter 21 — MASONRY
  29. Chapter 21A — MASONRY
  30. Chapter 22 — STEEL
  31. Chapter 22A — STEEL
  32. Chapter 23 — WOOD
  33. Chapter 24 — GLASS AND GLAZING
  34. Chapter 25 — GYPSUM PANEL PRODUCTS AND PLASTER
  35. Chapter 26 — PLASTIC
  36. Chapter 27 — ELECTRICAL
  37. Chapter 28 — MECHANICAL SYSTEMS
  38. Chapter 29 — PLUMBING SYSTEMS
  39. Chapter 30 — ELEVATORS AND CONVEYING SYSTEMS
  40. Chapter 31 — SPECIAL CONSTRUCTION
  41. Chapter 31A — SYSTEMS FOR WINDOW CLEANING OR EXTERIOR BUILDING…
  42. Chapter 31B — PUBLIC POOLS
  43. Chapter 31C — RADIATION
  44. Chapter 31D — FOOD ESTABLISHMENTS
  45. Chapter 31F — MARINE OIL TERMINALS
  46. Chapter 32 — ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
  47. Chapter 33 — SAFEGUARDS DURING CONSTRUCTION
  48. Chapter 34 — RESERVED
  49. Chapter 35 — REFERENCED STANDARDS
  50. Appendix A — EMPLOYEE QUALIFICATIONS
  51. Appendix B — BOARD OF APPEALS
  52. Appendix C — GROUP U—AGRICULTURAL BUILDINGS
  53. Appendix D — FIRE DISTRICTS
  54. Appendix E — RESERVED
  55. Appendix F — RODENTPROOFING
  56. Appendix G — FLOOD-RESISTANT CONSTRUCTION
  57. Appendix H — SIGNS
  58. Appendix I — PATIO COVERS
  59. Appendix J — GRADING
  60. Appendix K — GROUP R-3 AND GROUP R-3.1 OCCUPANCIES PROTECTED B…
  61. Appendix L — EARTHQUAKE RECORDING INSTRUMENTATION
  62. Appendix M — TSUNAMI-GENERATED FLOOD HAZARDS
  63. Appendix N — REPLICABLE BUILDINGS
  64. Appendix O — PERFORMANCE-BASED APPLICATION
  65. Appendix P — SLEEPING LOFTS
  66. Appendix Q — EMERGENCY HOUSING

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