City of Henderson

Required where vertical height ≥ 30 in over at least 30 sq ft. Rough opening minimum 22 in × 30 in. Ceiling access requires 30-in clear headroom above on at least one side. Where mechanical equipment is in attic, access must also comply with UMC Section 304.4.

IRC R807.1 (locally amended)

Wind speed 98 mph for elevations below 3,900 ft; Seismic Design Category D; frost line 1 ft below 5,000 ft; termite risk Moderate to Heavy. Wind exposure category C unless site-specific justification provided. Above 3,900 ft: defer to IBC.

IRC Table R301.2 (locally amended)

Grade must slope away at minimum 5% for 10 ft from foundation. Impervious surfaces within 10 ft: minimum 2% slope away. Swales within 10 ft: minimum 1% along flow line. Exception: low expansive/collapsible/soluble soils permit 2% slope.

IRC R401.3 (locally amended)

All structures must have a geotechnical report per 2024 IBC Chapter 18. Exceptions: single-story structures under 600 sq ft, decks/shade structures/patio covers, and ground-mounted solar systems accessory to 1- or 2-family dwellings (use assumed values: 1,000 psf vertical bearing, 100 psf/ft lateral bearing, 0.25 friction, Exposure Class S2 sulfate).

IRC R401.4 (locally amended)

Grading permit required when total cut + fill exceeds 100 cubic yards OR site exceeds 1.0 acre.

Henderson Municipal Code Chapter 15.01

All projects requiring grading must have a grading plan prepared, stamped, and signed by a registered design professional per 2024 IBC Chapter 18 and Appendix J.

IRC R401.5 (locally amended)

Sleeping and habitable areas: 40 psf. Garages: 50 psf uniform / 2,000 lb concentrated. Uninhabitable attics without storage: 10 psf; with limited storage: 20 psf.

IRC Table R301.5 (locally amended)

Wood shingles and wood shakes are prohibited as a roofing material due to fire risk in desert climate. All roofing materials must be Class A fire-rated.

IRC R905.7 / R905.8 (locally amended)

Each townhouse unit must be structurally independent except: shared foundations, structural sheathing fastened to common wall framing, nonstructural coverings, flashing at common wall roof termination, and units separated by common wall per R302.2.2.

IRC R302.2.6 (locally amended)

Minimum 10-mil polyethylene meeting ASTM E1745 Class A; joints lapped not less than 6 inches. Exceptions: garages, unheated storage under 70 sq ft, driveways/walks/patios.

IRC R506.3.3 (locally amended)

Three-coat stucco over metal lath or paper-backed lath: scratch coat ≥ 3/8 in, brown coat ≥ 3/8 in, finish coat ≥ 1/8 in. Total minimum thickness 7/8 in (or 3/4 in with self-furring lath). Lath per ASTM C1063. Grade D paper (60-minute) or ASTM E2556 Type II water-resistant barrier required behind stucco.

IRC R703.6 / IBC Section 2512

Minimum 26-gauge galvanized corrosion-resistant weep screed with 3.5 in vertical attachment flange. Placed at or below foundation plate line; minimum 4 in above grade and 2 in above paved areas. Pool note: maintain minimum 2 in clearance between cool deck/patio and stucco weep screed.

IRC R703.7.2.1 / IBC Section 2512.1.2

Residential units in Climate Zone 3 must achieve 3.0 ACH50 via third-party blower door test. Alternatives: 4.0 ACH50 non-sprinklered, 4.5 ACH50 sprinklered. Qualifying air barriers include: 1/2 in gypsum board, 5/8 in Portland cement stucco, closed-cell spray foam (1.5 in min), and others per IECC C402.6.2.3.1.

IECC R402 / C402 (Climate Zone 3)

For Climate Zone 3B (Henderson below 4,000 ft elevation): no rigid board or air-impermeable insulation is required for condensation control at the roof plane. This is a relaxation from colder-climate requirements.

IRC Table R806.5 (locally amended)

Required only where geotechnical report indicates high water table or severe soil-water conditions. Where required: from finished grade to top of footing or 6 in below basement floor. Options include two-ply hot-mopped felts, 55 lb roll roofing, 40-mil polymer-modified asphalt, 60-mil flexible polymer cement, 1/8 in cement-based fiber-reinforced coating, or 60-mil solvent-free liquid-applied synthetic rubber.

IRC R406.2 (locally amended)

Required outside each sleeping area and inside sleeping area when fuel-burning appliance is within or accessible only through that sleeping area.

IRC R311.3 (locally amended)

Electrical work governed by 2023 NEC with Southern Nevada Amendments. Standard new residential service is 200-amp minimum. NV Energy Electric Service Requirements (Southern Nevada) govern utility service conductors and meter installation. Pool electrical: minimum #10 wire feeder with 30-amp breaker; timer boxes are NOT permitted as disconnect for pool motors.

2023 NEC (Clark County Amended) / HMC Chapter 15.28

Ceiling: R-38. Wood-framed wall: R-20 or R-13+5ci or 0+15ci. Floor: R-19 or R-13+5ci or 15ci. Unheated slab edge: none required. Vertical fenestration: max U-factor 0.30, max SHGC 0.25. Skylight: max U-factor 0.53, max SHGC 0.28.

IECC 2024 Tables R402.1.2 and R402.1.3 (Climate Zone 3)

No solid-fuel burning fireplace permitted below 4,000 ft elevation in the Las Vegas Valley Hydrographic Basin unless EPA Phase II certified or a masonry fireplace with gas logs and sealed glass cover. Required sign: "Approved for fuel gas use only." Sleeping-room fireplaces require a permanent 4-in fresh air duct from exterior to firebox.

IRC R1007 / R1008 (locally added via SNBO amendment)

Residential gas piping governed by Uniform Fuel Gas Code (part of UPC) and NFPA 54. Corrugated Stainless Steel Tubing (CSST) must be bonded to the electrical service grounding electrode system.

UPC / NFPA 54

HVAC systems must be designed using ACCA Manual J load calculations based on local climate criteria (Climate Zone 3B, mean annual temp 66.3°F). Duct sealing and insulation required per 2024 IECC; ducts in unconditioned spaces must be insulated.

UMC 2024 with Southern Nevada Amendments / HMC Chapter 15.24

All residential plumbing is governed by the 2024 Uniform Plumbing Code (UPC) with Southern Nevada Amendments. IRC Chapters 25–33 and 24–43 are deleted and replaced by reference to UPC. IRC Section P2904 for residential fire sprinklers is retained.

IRC Amendment (local) / HMC Chapter 15.20

Maximum combined water surface area of all pools, spas, and water features on a single-family parcel is 600 square feet. LVVWD must approve pool permit before the City of Henderson issues a building permit.

LVVWD Policy / Southern Nevada Water Authority

Backwash and drain water must discharge to sanitary sewer or approved on-site disposal with air gap; no direct connection to the disposal system is permitted.

ISPSC Section 321.1 (locally amended)

For 1- and 2-family dwellings, pool barrier must be at least 60 inches (5 feet) above grade on the pool-facing outward side, measured at 3 ft horizontal from outside the barrier. Public pools: 72 in minimum.

ISPSC Section 305.2.1 (locally amended)

Self-locking latch on gate exterior at minimum 54 in above grade. Self-latching mechanism on pool side only: at least 3 in below top of gate.

ISPSC Section 305.3.3 (locally amended)

Required inspections in order: 901 Pre-Gunite → 903 Gas Test → 905 Pre-Deck → 908 Spa Only → 910 Pre-Plaster/Final.

Henderson Building and Fire Safety

Pool or spa must not be closer than 60 inches (5 feet) to any building or structure and must not encroach into public utility easements. Exception requires a Nevada-licensed Structural or Civil Engineer substantiation.

ISPSC Section 327.2 (locally amended)

Must conform to Table 307.2.2 standards and be designed per IBC structural requirements. Default design parameters (without site-specific soils report): minimum 60 psf/ft lateral bearing pressure, Exposure Class S2 (severe sulfate). If groundwater present: hydrostatic relief valve required at lowest point.

ISPSC Section 307.2.2 (locally amended)

All site improvements on multifamily and non-residential projects must provide accessible routes per ICC A117.1-2017 (adopted by reference through IBC Chapter 11). Accessible route requirements: minimum 44-inch clear width (36 inches where not a primary route), maximum running slope 1:20 (5%), maximum cross-slope 1:48 (2%). Accessible parking spaces: van-accessible spaces minimum 11 ft wide with 5-ft access aisle; standard accessible spaces minimum 8 ft wide with 5-ft access aisle. Curb ramps at all accessible route crossings of curbs: maximum slope 1:12 (8.33%), minimum width 36 inches, detectable warning surface required. Single-family residential is generally exempt from ADA; multifamily with 4+ units must provide accessible units per Fair Housing Act.

IBC 2024 Chapter 11 / ICC A117.1-2017 / ADA Standards for Accessible Design

Swimming pools serving multifamily or common-use facilities must provide at least one accessible means of entry per ADA Standards Section 242: primary entry must be a sloped entry (ramp to water) or pool lift; secondary entry if pool has 300+ linear feet of wall. Spas: at least one accessible entry (pool lift or transfer wall). Accessible route from accessible parking to pool entry required. Recreational facilities (sport courts, playgrounds, clubhouses): must comply with ADA Standards Sections 206–240 for accessible routes, clear floor space, reach ranges, and operable parts. Playground equipment: 50% of elevated play components accessible via ramp or transfer system per ADA Standards Section 240.

ADA Standards for Accessible Design, Sections 240-242 / IBC Chapter 11

A registered design professional must certify that site conditions at time of final construction provide positive drainage per the approved drainage plan. Must be submitted to and approved by the Building Inspection Department.

Henderson Building Division requirement

A drainage study by a registered Nevada Civil Engineer is required before civil improvement plans can be accepted. Not required for projects under 2 acres outside FEMA Special Flood Hazard Areas that are not adjacent to a CCRFCD facility.

Henderson Development Code Section 19.14.6

New turf in residential front yards is prohibited. Side and rear yard turf limited to 50% or less of total square footage. No new turf in common areas or medians. Front and street side yards must have desert/drought-tolerant landscaping with in-ground irrigation.

Nevada AB 356 / SNWA / Henderson Development Code Chapter 19.11

Separate building permit required per parcel for fences, walls, and retaining walls. Retaining walls retaining more than 24 inches require engineering by a registered design professional. Footings must be designed by a registered Civil or Structural Engineer for all imposed loads including soil pressure, surcharge, seismic, and hydrostatic forces per IBC Chapter 18. Default design parameters where no soils report: assume 60 psf/ft lateral soil pressure, Exposure Class S2 (severe sulfate exposure) — concrete minimum f'c 4,000 psi for footings in sulfate soils. No fence or wall may block a natural flow path. Prohibited materials: pointed pickets, electrocution components, embedded glass, barbed/razor wire.

IBC 2024 Appendix Q / Henderson Development Code Section 19.10.6

Private water and sewer laterals must conform to UDACS 2025 (water) and DCSWCS 2019 (sewer) with the City of Henderson Addendum. Water hydraulic analysis approval required before civil plan acceptance.

UDACS 2025 / DCSWCS 2019

Retaining walls over 24 inches (top of footing to top of wall) require a building permit and engineering by a registered Civil or Structural Engineer. Footing design must account for: lateral soil pressure (minimum 60 psf/ft unless geotechnical report specifies otherwise), surcharge loads, seismic forces (Seismic Design Category D), and hydrostatic pressure where applicable. Concrete minimum compressive strength f'c = 3,000 psi general; f'c = 4,000 psi where soils report indicates Exposure Class S2 (severe sulfate) conditions, which is common in Southern Nevada soils. Footings must extend below frost depth (minimum 12 inches below finish grade in the Las Vegas Valley). Required inspections: footing excavation, reinforcing steel placement, drainage/dampproofing before backfill.

IBC 2024 Appendix Q / IBC Chapter 18 / Henderson Municipal Code Section 15.08

All public sidewalks and pedestrian facilities in public right-of-way must comply with the ADA Standards for Accessible Design and PROWAG (Public Rights-of-Way Accessibility Guidelines). Pedestrian curb ramps: maximum slope 1:12 (8.33%) in direction of travel, maximum 1:48 (2%) cross-slope, minimum 48-inch clear landing at top, detectable warning surface (truncated domes) 24 inches deep across full width in yellow or contrasting color. Sidewalk cross-slope maximum 2% (1:48). Sidewalk running slope follows roadway grade; where grade exceeds 5%, handrails are required at 8.33% or steeper. Accessible pedestrian signals required at signalized intersections per MUTCD. Developer is responsible for installing compliant curb ramps at all intersections within or adjacent to the subdivision.

ADA Standards for Accessible Design / PROWAG / MUTCD / Henderson Development Code Chapter 19.14

Before civil improvement plans can be accepted: (1) Approved TIA or exemption letter, (2) Approved Technical Hydrology Study or exemption, (3) Water Hydraulic Analysis approval, (4) Geotechnical report (4 copies, sealed, within 1 year), (5) Conditions of Approval from Planning, (6) 60% Design Review completion from Utility Services for backbone water/sewer, (7) Grading permit application submitted to Building Division.

Henderson Civil Improvements Submittal Checklist

Maximum hydrant spacing 600 ft in residential areas. At least one hydrant within 100 ft of subdivision entrance. Hydrants placed at all intersections first, then alternating spacing along streets.

2024 IFC Southern Nevada Amendments, Appendix C

A Traffic Impact Analysis (TIA) must be approved before civil improvement plans are accepted. A master street light and traffic control plan is required for phased construction. Henderson Master Transportation Plan governs. NDOT Standards apply to state highway frontages.

Henderson Development Code Chapter 19.14

All public offsite improvements must conform to the Clark County Area Uniform Standard Drawings for Public Works Construction (published by RTC). Includes H-series (Henderson-specific) and C-series (Clark County) details. Available as PDF and DWG.

Clark County Area Uniform Standard Drawings

Water main minimum 8-inch diameter for lines feeding multiple hydrants. Dead-end maximum: 150 ft of 6-inch pipe feeding one hydrant. Working pressure minimum 150 psi. Governed by UDACS 2025 + Henderson UDACS Addendum.

UDACS 2025 + Henderson Addendum (effective March 1, 2025)