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Boise, ID Code of Ordinances
CITY CODE of BOISE CITY, IDAHO
ORDINANCES PENDING REVIEW FOR CODIFICATION
ADOPTING ORDINANCE
TITLE 1 ADMINISTRATION
TITLE 2 BOARDS, COMMISSIONS, COMMITTEES
TITLE 3 LICENSES AND PERMITS
TITLE 4 HEALTH AND SANITATION
TITLE 5 PUBLIC SAFETY
TITLE 6 MOTOR VEHICLES AND TRAFFIC
TITLE 7 PUBLIC WAYS AND PROPERTY
TITLE 8 AIRPORT
TITLE 9 BUILDING CODES AND REGULATIONS
CHAPTER 1 BUILDING CODE
ARTICLE A. BUILDING CODE
ARTICLE B. ONE- AND TWO-FAMILY DWELLING BUILDING CODE
9-1B-1: PURPOSE:
9-1B-2: CODE ADOPTED:
9-1B-3: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R101.1, TITLE:
9-1B-4: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R101.2, SCOPE, REPEAL THE EXCEPTION AND REPLACE:
9-1B-5: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R102.7, EXISTING STRUCTURES:
9-1B-6: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R103, DIVISION OF BUILDING SAFETY:
9-1B-7: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R104.10.1, FLOOD HAZARD AREAS:
9-1B-8: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R105.2, WORK EXEMPT FROM PERMIT:
9-1B-9: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R105.2.1, EMERGENCY REPAIRS:
9-1B-10: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R105.2.2, REPAIRS:
9-1B-11: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R105.3.1.1, DETERMINATION OF SUBSTANTIALLY IMPROVED OR SUBSTANTIALLY DAMAGED EXISTING BUILDINGS IN FLOOD HAZARD AREAS:
9-1B-12: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R105.3.2, TIME LIMITATION OF APPLICATION:
9-1B-13: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R105.5, EXPIRATION:
9-1B-14: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD SECTION R105.10, PERMIT TRANSFER:
9-1B-15: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R106.1, SUBMITTAL DOCUMENTS:
9-1B-16: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R107.1, TEMPORARY STRUCTURES - GENERAL:
9-1B-17: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R107.3, TEMPORARY POWER:
9-1B-18: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R108.2, SCHEDULE OF PERMIT FEES:
9-1B-19: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R108.3, BUILDING PERMIT VALUATIONS:
9-1B-20: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R108.5, FEE REFUNDS:
9-1B-21: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R108.6, WORK COMMENCING BEFORE PERMIT ISSUANCE:
9-1B-22: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R109.1.3, FLOODPLAIN INSPECTIONS:
9-1B-23: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R109.4, APPROVAL REQUIRED:
9-1B-24: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD SECTION R110.1.1, CERTIFICATE OF COMPLETION:
9-1B-25: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R110.4, TEMPORARY OCCUPANCY:
9-1B-26: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R111.1, CONNECTION OF SERVICE UTILITIES:
9-1B-27: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD SECTION R111.4, AUTHORITY TO DISCONNECT UTILITIES FOR OCCUPANCY VIOLATIONS:
9-1B-28: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R112.1, BUILDING CODE BOARD OF APPEALS, ADD SECTION R112.1.1, APPEALS TO THE BUILDING CODE BOARD OF APPEALS AND ADD SECTION R112.1.2, APPEAL PROCEDURE:
9-1B-29:
9-1B-30: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R114, STOP WORK ORDER:
9-1B-31: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD SECTION R115, UNSAFE STRUCTURES AND EQUIPMENT AND SECTION R115.1, CONDITIONS:
9-1B-32: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R202, DEFINITION FOR TOWNHOUSE:
9-1B-33: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R301.2(1), CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA:
9-1B-34: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R301.2.1.2, PROTECTION OF OPENINGS, IS DELETED:
9-1B-35: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.1(1), EXTERIOR WALLS:
9-1B-36: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.6, DWELLING-GARAGE SEPARATION:
9-1B-37: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R303.4, MECHANICAL VENTILATION:
9-1B-38: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R309.3, FLOOD HAZARD AREAS:
9-1B-39: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R313.1, TOWNHOUSE AUTOMATIC FIRE SPRINKLER SYSTEMS EXCEPTION:
9-1B-40: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R313.2, ONE- AND TWO-FAMILY DWELLINGS AUTOMATIC FIRE SPRINKLER SYSTEMS, IS DELETED:
9-1B-41: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R314.2.2, ALTERATIONS, REPAIRS AND ADDITIONS, DELETE EXCEPTION #2:
9-1B-42: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD SECTION R314.7.5, HEAT DETECTOR WITHIN GARAGES:
9-1B-43: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R315.2.2, ALTERATIONS, REPAIRS AND ADDITIONS, DELETE EXCEPTION #2:
9-1B-44: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R322.1, FLOOD-RESISTANT CONSTRUCTION, GENERAL:
9-1B-45: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R322.1.10, AS-BUILT ELEVATION DOCUMENTATION:
9-1B-46: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R322.2.1, ELEVATION REQUIREMENTS:
9-1B-47: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R322.2.2, ENCLOSED AREA BELOW DESIGN FLOOD ELEVATION, SUBPARAGRAPH 2.1:
9-1B-48: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R403.1(1) MINIMUM WIDTH AND THICKNESS FOR CONCRETE FOOTINGS FOR LIGHT-FRAME CONSTRUCTION, TABLE R403.1(2) MINIMUM WIDTH AND THICKNESS FOR CONCRETE FOOTINGS FOR LIGHT-FRAME CONSTRUCTION WITH BRICK VENEER, TABLE R403.1(3) MINIMUM WIDTH AND THICKNESS FOR CONCRETE FOOTINGS WITH CAST-IN-PLACE OR FULLY GROUTED MASONRY WALL CONSTRUCTION, AND TABLE R403.4 MINIMUM DEPTH (D) AND WIDTH (W) OF CRUSHED STONE FOOTINGS, ARE DELETED:
9-1B-49: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD TABLE R403.1, MINIMUM WIDTH OF CONCRETE, PRECAST, OR MASONRY FOOTINGS:
9-1B-50: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R403.1.1, MINIMUM SIZE:
9-1B-51: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R602.10, WALL BRACING:
9-1B-52: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R903.1, GENERAL ROOF COVERING:
9-1B-53: ADDITION OF GRADING PROVISIONS RELATED TO ONE-AND-TWO-FAMILY DWELLINGS:
9-1B-54: ADDITION OF MINIMUM STANDARDS FOR MODULAR NON-HUD STRUCTURES AND MANUFACTURED PRE-HUD STRUCTURES:
9-1B-55: FIRE SPRINKLER AND ALTERNATIVE EXTINGUISHING SYSTEM PERMITS, PLAN REVIEW, INSPECTIONS, AND FEES:
9-1B-56: FIRE ALARM SYSTEM PERMITS, PLAN REVIEW, INSPECTIONS, AND FEES:
CHAPTER 2 DEVELOPMENT IMPACT FEE
CHAPTER 3 SPECIAL DESIGN STANDARDS FOR TYPE V CONSTRUCTION
CHAPTER 4 PLUMBING CODE
CHAPTER 5 ELECTRICAL CODE
CHAPTER 6 UNIFORM HOUSING CODE
CHAPTER 7 MECHANICAL, FUEL GAS AND RESIDENTIAL CODES1
CHAPTER 7A MECHANICAL CODE
CHAPTER 7B FUEL GAS CODE
CHAPTER 8 SOLID FUEL HEATING APPLIANCES
CHAPTER 9 ENERGY CONSERVATION CODE
CHAPTER 10 EXISTING BUILDING CODE
CHAPTER 11 DANGEROUS BUILDINGS CODE
CHAPTER 12 MOVING, DECONSTRUCTION, OR DEMOLITION OF BUILDINGS
CHAPTER 13 GREEN CONSTRUCTION CODE
CHAPTER 14 CONSTRUCTION SITE EROSION CONTROL
TITLE 10 PUBLIC UTILITIES
TITLE 11 DEVELOPMENT CODE
PARALLEL REFERENCES
9-1B-33: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R301.2(1), CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA:
Local climatic and geographic design criteria for Table R301.2(1) shall be as follows:
   TABLE R301.2(1)
   CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
   GROUND SNOW LOADo: 20 PSF.
   Design roof load shall not be less than a uniform snow load of 25 psf.
   WIND DESIGN SPEEDd (mph): 90
   Wind speed from the basic wind speed map [Figure R301.2(4)A]. Wind exposure category shall be determined in accordance with Section R301.2.1.4
   WIND DESIGN TOPOGRAPHIC EFFECTSk: NO
   In accordance with Section R301.2.1.5
   SEISMIC DESIGN CATEGORYf: C
   In accordance with Section R301.2.2.1
   WEATHERINGa: Severe
   As determined from the Weathering Probability Map [Figure R301.2(3)]. The grade of masonry units shall be determined from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or C652.
   FROST LINE DEPTHb: 24 inches
   TERMITEc: Slight to Moderate
   Based on history of local subterranean termite damage.
   WINTER DESIGN TEMPe: 10 degrees F
   The outdoor design dry-bulb temperature shall be selected from the columns of 97 1/2 percent values for winter from Appendix D of the International Plumbing Code or as determined by the Building Official.
   ICE BARRIER UNDER LAYMENT REQUIREDh: NO
   In accordance with Sections R905.2.7.1, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, where there has been a history of local damage from the effects of ice damming.
   FLOOD HAZARDSg: First Floodplain Ordinance for the City of Boise City became effective December 12, 1983. Flood Insurance Study (FIS) June 19, 2020. Panel numbers (all with a date of June 19, 2020) are: 0160 J, 0161 J, 0162 J, 0166 J, 0167 J, 0169 J, 0178 J, 0186 J, 0187 J, 0188 J, 0189 J, 0193 J, 0254 J, 0258 J, 0259 J, 0265 J, 0267 J, 0270 J, 0276 J, 0277 J, 0281 J, 0282 J, 0283 J, 0284 J, 0286 J, 0287 J, 0291 J, 0295 J, 0305 J, 0315 J. The adopted flood hazard map and supporting data are hereby adopted by reference and declared to be part of this section.
   AIR FREEZING INDEXi: 894
   Based on the 100-year return period air freezing index (BF-days) from Figure R403.3(2) or from the 100-year (99%) value on the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32° Fahrenheit)" at www.ncdc.noaa.gov/fpsf.html.
   MEAN ANNUAL TEMPj: 51.1 degrees F
   Based on the mean annual temperature from the National Climatic Data Center data table "Air Freezing Index-USA Method (Base 32°F)" at www.ncdc.noaa.gov/fpsf.html.
   MANUAL J DESIGN CRITERIAn:
   Elevation: 2867                      Latitude: 44 deg. N.
   Winter heating: 11 deg.               Summer cooling: 95 deg.
   Altitude correction factor: .98            Indoor design temperature: Heating-70 deg.
   Design temperature cooling: 75 deg.      Heating temperature difference: 60 deg.
   Cooling temperature difference: 20 deg.   Wind velocity heating: 15.0
   Wind velocity cooling: 7.5               Coincident wet bulb: 63 deg.
   Daily range: High                  Winter humidity: 50%
   Summer humidity: 50%
   Footnotes published underneath Table R301.2(1) in the code are applicable.
(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)
9-1B-34: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R301.2.1.2, PROTECTION OF OPENINGS, IS DELETED:
Section R301.2.1.2, Protection of Openings, is deleted.
(Ord. 40-20, 12-1-2020, eff. 1-1-2021)
9-1B-35: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.1(1), EXTERIOR WALLS:
Table R302.1(1) shall be amended as follows:
   TABLE R302.1(1)
   EXTERIOR WALLS
Exterior Wall Element
Minimum Fire- Resistance Rating
Minimum Fire Separation Distance
Exterior Wall Element
Minimum Fire- Resistance Rating
Minimum Fire Separation Distance
Walls
Fire- resistance rated
1 hour-tested in accordance with ASTM E119, UL 263, or Section 703.3 of the International Building Code with exposure from both sides
<3 feet
Not fire- resistance rated
0 hours
3 feet
Projections
Fire- resistance rated
1 hour on the underside, or heavy timber, or fire retardant-treated wooda,b
2 feet to <3 feet
Not fire- resistance rated
0 hours
3 feet
Openings in walls
Not allowed
N/A
<3 feet
25% maximum of wall area
0 hours
3 feet to <5 feet
Unlimited
0 hours
5 feet
Penetrations
All
Comply with Section R302.4
<3 feet
None required
3 feet
 
   For SI: 1 foot = 304.8 mm.
   N/A = Not Applicable.
   a.   The fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing.
   b.   The fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the rake overhang where gable vent openings are not installed.
(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)
9-1B-36: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.6, DWELLING-GARAGE SEPARATION:
Delete Table R302.6 Dwelling-Garage Separation and replace with the following Table:
   TABLE R302.6 DWELLING-GARAGE SEPARATION
 
Separation
Material
From the residence, attics, and habitable rooms above the garage
Not less than 5/8-inch Type X gypsum board or equivalent applied to the garage side
Structure(s) supporting floor/ceiling assemblies used for separation required by this section
Not less than 5/8-inch Type X gypsum board or equivalent applied to the garage side
Garages located less than 3 feet from a dwelling unit on the same lot
Not less than 5/8-inch Type X gypsum board or equivalent applied to the interior side of the exterior walls that are within this area
 
(Ord. 3-25, 2-4-2025)
9-1B-37: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R303.4, MECHANICAL VENTILATION:
Repeal section R303.4 and replace with the following:
   R303.4 Mechanical ventilation. Dwelling units shall be provided with whole-house mechanical ventilation in accordance with Section M1505.4.
(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)
9-1B-38: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, SECTION R309.3, FLOOD HAZARD AREAS:
   R309.3 Flood Hazard Areas. All construction within flood hazard areas shall be designed and constructed in accordance with the Flood Hazard regulations of the Boise Development Code in addition to this code. For buildings located in flood hazard areas as established by Table R301.2(1), garage floors shall be:
      1.   Elevated to or above the design flood elevation as determined in accordance with Section R322; or
      2.   Located below the design flood elevation provided that the floors are at or above grade on not less than one side, are used solely for parking, building access, or storage, meet the requirements of Section R322 and are otherwise constructed in accordance with this code.
(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)

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