Deck building codes by state
Residential deck construction in the United States is governed primarily by Section R507 of the International Residential Code (IRC) and the American Wood Council’s prescriptive guide DCA 6. But every state adopts and amends the IRC on its own schedule, and local jurisdictions layer additional requirements on top — particularly for frost-footing depth, guardrail height, and ledger attachment methods. Below is every US state’s current deck-code context, with links to the full state guide for licensing, permit, and contractor-vetting detail.
How deck building codes work in the US
The International Residential Code (IRC) Section R507 — “Exterior Decks” — is the model code that most states adopt as their baseline for residential deck construction. R507 covers ledger attachment to the house band joist, footing size and depth, post and beam sizing, joist spans, decking fastening, stair construction, and guardrail requirements. The American Wood Council’s DCA 6 (Prescriptive Residential Wood Deck Construction Guide) provides the span tables and connection details that building departments use to evaluate permit applications for straightforward decks without requiring an engineer’s stamp.
The IRC establishes these national minimums, but every state adopts its own edition of the IRC on its own timeline — some states are on the 2021 IRC, others still on 2015 or 2018 — and states and local jurisdictions frequently amend specific provisions. The most common local amendments to deck code involve frost-footing depth (which must match the local frost line, ranging from zero in Hawaii and South Florida to 48+ inches in Minnesota and Maine), wind-load uplift requirements in hurricane-prone coastal areas, and post-base hardware specifications.
The key national minimums that apply almost everywhere: guardrails are required on any deck surface more than 30 inches above grade; residential guardrail height must be at least 36 inches (42 inches on commercial applications); balusters must be spaced so a 4-inch sphere cannot pass through; a handrail is required on any stair run with 4 or more risers; and ledger boards must be through-bolted to the house band joist with approved hardware and flashing, not simply nailed.
This is a research-based summary, not legal advice. Code editions and local amendments change; building departments interpret provisions differently; and site-specific conditions (soil type, wind exposure, proximity to wetlands) can impose requirements that go beyond what is listed here. Before starting any deck project, confirm the current adopted code and local amendments with your local building department.
Deck building code snapshot by state
| State | Summary | Citation |
|---|---|---|
| Alabama | Alabama deck building is governed by local IRC editions adopted by Birmingham, Huntsville, Montgomery, Mobile, Tuscaloosa, and other municipalities, with state building code authority for non-residential structures administered by the Alabama Building Commission. IRC Section R507 (Exterior Decks) governs ledger attachment, post-and-beam sizing, guard-rail height and baluster spacing, and stair requirements. Frost depth is essentially 0–6 inches statewide, making footing design a soil-bearing-capacity exercise rather than a frost-penetration calculation. Under Act 2024-443 (effective October 1, 2024), residential code adoption authority moved to the HBLB Residential Building Code Advisory Council. | IRC R507; Code of Alabama §34-14A (HBLB) |
| Alaska | Alaska does not have a dedicated matching regulation, but the UTPCPA at AS 45.50.471 prohibits deceptive acts in the settlement of insurance claims. When partial deck damage — particularly to composite decking where weathered and new boards are visually incompatible — results in a mismatched repair that misrepresents the quality of the settlement, homeowners can invoke AS 45.50.531 for treble damages. The Alaska Division of Insurance complaint portal at commerce.alaska.gov/web/ins is the starting point for insurer-side matching disputes. | AS 45.50.471 / AS 45.50.531 |
| Arizona | Arizona adopts IRC R507 for exterior deck construction at the municipal level — code editions vary by city (Phoenix on 2024 PBCC, Scottsdale on 2021 IRC, Tucson and Mesa on their own schedules). Guardrails required when walking surface exceeds 30 inches above grade; guard height 36 inches minimum. Ledger boards must be through-bolted with flashing per R507.9. In northern Arizona communities above 4,500 feet (Flagstaff, Prescott, Payson), frost-depth footings of 18–24 inches and snow-load engineering are required. ROC B-1 General Residential license required for all residential deck work above $1,000 under A.R.S. §32-1151. | IRC R507; A.R.S. §32-1151; local municipal amendments |
| Arkansas | Arkansas has adopted the 2018 International Residential Code as its statewide residential building standard. Section R507 governs exterior deck design including footing requirements, ledger attachment, lateral-load connectors, joist sizing, and guardrail height for all residential construction. | IRC R507; 2018 Arkansas Residential Building Code |
| California | California adopts the IRC with state amendments, and Chapter 7A of the California Building Code imposes ignition-resistant material requirements on decks in the State Responsibility Area and Very High Fire Hazard Severity Zones. Guardrails required when the deck walking surface exceeds 30 inches above grade; guard height 36 inches minimum. Lateral-load (hold-down) connections required per California Residential Code R507.9; seismic design governs connection sizing in Seismic Design Categories C and D. Zone 0 ember-resistant construction rulemaking is ongoing; final adoption expected 2026. | CA Residential Code R507; CBC Chapter 7A |
| Colorado | Colorado adopts the IRC by municipality, and most Front Range cities enforce IRC R507 (Exterior Decks) with local amendments. Guard height is 36 inches minimum; guardrails required when the walking surface exceeds 30 inches above grade. Lateral-load (hold-down tension) connections required per R507.9. Footings must extend below the local frost depth — approximately 36 inches on the Front Range, 48 inches or more in high-altitude counties. Ground snow loads above prescriptive table limits require engineered structural design. WUI fire zones in designated areas require ignition-resistant Zone 0 materials under SB 23-166. | IRC R507; SB 23-166 (WUI Code) |
| Connecticut | Connecticut IRC R507 adoption under the 2022 CSBC requires attached decks to meet prescriptive ledger-attachment, footing, guard, and stair standards statewide. CGS §38a-316e (matching statute for real-property losses) applies to deck-material replacement claims: insurers must replace adjacent components to a reasonably uniform appearance within the same line of sight, relevant when storm damage requires partial decking or railing replacement. | IRC R507; CGS §38a-316e |
| Delaware | Delaware's matching standard sits in 18 Del. Admin. Code 902, patterned on the NAIC model. When a partial deck loss can't be repaired with materials reasonably matching the undamaged sections in quality, color, and texture, the carrier must address the affected area to produce a reasonably uniform appearance. This is most relevant for composite decking partial replacements where weathered and new boards are visually incompatible. Paired with 18 Del. C. §2304(16)'s duty of prompt, fair settlement, the rule gives coastal Sussex homeowners leverage on partial-deck storm damage claims. | 18 DE Admin. Code 902 |
| Florida | Florida adopts the 2023 Florida Building Code for residential deck construction, which incorporates IRC Section R507 (Exterior Decks) with Florida-specific amendments for wind loads, ledger attachment, and hardware in the High Velocity Hurricane Zone. Guardrails are required when the walking surface exceeds 30 inches above grade; guard height is 36 inches minimum. Lateral-load (hold-down) connections are required on all attached decks per R507.9. The HVHZ overlay in Miami-Dade and Broward counties requires NOA-listed hardware at design wind speeds of 170–195 mph. | IRC R507; FBC 8th Ed. |
| Georgia | Georgia adopts the 2024 IRC with Georgia Amendments (effective January 1, 2026) for residential deck construction. IRC Section R507 governs framing, footings, ledger attachment, and materials. Guardrails required when walking surface exceeds 30 inches above grade; guard height 36 inches minimum. Lateral-load (hold-down tension) connections required per R507.9. Ledger boards must be through-bolted to the house band joist with flashing. Ground-contact lumber minimum: 0.60 lb/ft³ treatment. No frost-depth requirement of consequence, but soil bearing governs footing design. | IRC R507; 2024 GA Amendments |
| Hawaii | Hawaii has no deck-specific matching statute, but HRS §431:13-103 (Unfair Claim Settlement Practices Act) bars insurers from forcing homeowners to accept obviously mismatched repairs. Under §431:13-103(a)(11), failing to attempt a prompt, fair, equitable settlement once liability is reasonably clear is an unfair practice. Decks where only a partial section is storm-damaged create matching disputes between weathered and new composite board — carriers in Hawaii have been pressed by the Insurance Division to address visible mismatch on Coverage A claims. | HRS §431:13-103 |
| Idaho | IRC R507 (Exterior Decks) governs structural requirements for residential decks in Idaho under the 2020 Idaho Residential Code. Ledger attachment must use lag screws or through-bolts per R507.2.3; footings must clear the local frost depth per R403.1.4; guards are required at surfaces more than 30 inches above grade, minimum 36 inches high with 4-inch baluster spacing per R507.9. Idaho Code §41-1329 and IDAPA 18.01.27 require carriers to acknowledge deck-related claims promptly and investigate in good faith. Document calls, demand written denials, and report §41-1329 violations to doi.idaho.gov. | IRC R507; Idaho Code §41-1329; IDAPA 18.01.27 |
| Illinois | Illinois adopted the IRC statewide effective January 1, 2025 (Public Act 103-0510), including Section R507 for exterior decks. Key requirements: footings below 42-inch frost depth in the Chicago metro; ledger boards bolted per R507.9 with Z-flashing; lateral-load connectors per R507.9.1; guards when walking surface exceeds 30 inches above grade; guard height minimum 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Local amendments vary by municipality; always confirm the code edition in force with your local building department. | IRC R507; Public Act 103-0510 |
| Indiana | Indiana deck construction is governed by the 2020 Indiana Residential Code (based on the 2018 IRC), administered by the Indiana Department of Homeland Security Fire and Building Safety Commission, with local enforcement by city and county building departments. IRC Section R507 (Exterior Decks) is the primary technical section covering ledger attachment, post-and-beam sizing, guard-rail height, baluster spacing, and stair design. Frost depth requirements are set by IRC Table R301.2(1) as adopted by local jurisdictions: 24–30 inches in central Indiana and 30–36 inches in northern Snow Belt counties. | IRC R507; 2020 Indiana Residential Code |
| Iowa | Iowa deck construction is governed by IRC R507 as locally adopted across major metros. Iowa enforces a line-of-sight matching rule under 191 IAC 15.44 for insurance claims — when replacement decking or railing components don't match the undamaged portion in quality, color, or size, the insurer must replace as much as needed for a reasonably uniform appearance within the same line of sight. | IRC R507; 191 IAC 15.44 (Iowa Insurance Division) |
| Kansas | Kansas has no statewide building code mandate — each city and county adopts its own code. Wichita, Overland Park, and most major Kansas cities have adopted the 2018 International Residential Code. Section R507 governs exterior deck construction including footing depth, ledger attachment, lateral-load connectors, joist sizing, and guardrail height in adopting jurisdictions. Unincorporated county areas may have no formal code enforcement. | IRC R507; 2018 IRC (Wichita, Overland Park, Topeka adoption) |
| Kentucky | Kentucky deck construction is governed by the 2018 Kentucky Residential Code (based on 2015 IRC) administered by DHBC. IRC Section R507 covers exterior decks including footing design, ledger attachment (R507.2.3), joist and beam sizing, guardrail height (36 inches minimum above 30-inch grade change), and baluster spacing. Frost-depth requirements run from 8 inches in western Kentucky to 18–20 inches in the northeastern highlands and are enforced at the local permit level. Kentucky has not adopted the 2021 IRC statewide as of mid-2026. | IRC R507; 2018 Kentucky Residential Code |
| Louisiana | Louisiana adopted the IRC 2021 statewide through the Louisiana State Uniform Construction Code (LSUCC), effective January 1, 2023, including Section R507 for exterior decks. Key requirements: footings bear on native soil below disturbed grade (no frost-depth constraint, but minimum embedment per AHJ); ledger boards bolted per R507.9 with continuous Z-flashing; lateral-load connections per R507.9.1; guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Coastal parishes apply ASCE 7-16 wind-speed overlays that require engineered connection design above IRC prescriptive table values. | IRC R507; LSUCC 2021 |
| Maine | Maine deck construction is governed by IRC R507 through MUBEC adoption. Maine has no statutory matching rule, but 24-A M.R.S. §2164-D and Bureau of Insurance Rule Ch. 290 bar unfair claim settlement practices — including failure to adopt reasonable investigation standards and refusing payment without one. Disputes over partial deck replacement and discontinued-material matching are routed to the Maine Bureau of Insurance at maine.gov/pfr/insurance as unfair-practice complaints. | IRC R507; 24-A M.R.S. §2164-D |
| Maryland | Maryland adopted the 2021 International Residential Code effective May 29, 2023 as the Maryland Building Performance Standards. Section R507 governs exterior deck design, footing depth, ledger attachment, and guardrail requirements for all residential construction statewide. | IRC R507; 2021 Maryland BPS (eff. May 29, 2023) |
| Massachusetts | Massachusetts has adopted the IRC Tenth Edition (based on IRC 2021) through 780 CMR, including Section R507 (Exterior Decks). Guardrail height is 36 inches at surfaces more than 30 inches above grade; balusters must reject a 4-inch sphere. Frost-depth footing requirements range from 36 inches near Boston to 48+ inches in Berkshire County. Ledger attachment must comply with R507.9 through-bolt requirements with flashing and R507 lateral-load connectors. A Ch 142A violation on a deck contract is a per se Ch 93A unfair practice — the strongest consumer-protection overlay in the Northeast. | IRC R507; 780 CMR Tenth Edition |
| Michigan | Michigan adopted the 2021 IRC through the Michigan Residential Building Code (MRBC) with Michigan-specific amendments. IRC R507 governs exterior decks. Key requirements: footings must bear below local frost depth (36 inches in southeast Michigan, 42 inches in northern Lower Peninsula and UP); ledger boards bolted per R507.9 with continuous flashing per R507.2.4; lateral-load connections per R507.9.1; guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Upper Peninsula projects may require structural engineering for snow loads exceeding 70 psf in western UP counties. Enforcement is by local AHJ. | IRC R507; MRBC 2021 |
| Minnesota | Minnesota's deck building code is governed by the Minnesota Residential Code (MRC), based on the 2020 IRC with state amendments. IRC Section R507 (Exterior Decks) is the primary technical section covering ledger attachment, post-and-beam sizing, guard-rail height and baluster spacing, and stair design. Frost depth requirements are set by MRC Table R301.2(1), with values ranging from 42 inches in the Twin Cities metro to 60 inches in northern lake counties — among the most demanding footing requirements in the contiguous United States. | IRC R507; MRC Table R301.2(1) |
| Mississippi | Mississippi's IRC adoption under SB 2378 (2014) brings IRC R507 exterior deck requirements statewide, including ledger attachment, footing specs, guard height, and lateral-load connections. Frost depth in Mississippi is 0–4 inches; coastal counties in the hurricane-prone region layer ASCE 7 wind-speed requirements on top of IRC minimums. Local building departments administer permits and inspections; unincorporated rural areas may lack enforcement. | IRC R507; Miss. Code Ann. §17-2-1 |
| Missouri | Missouri has adopted the IRC (2015–2018 edition depending on jurisdiction) through municipal ordinance; Section R507 governs exterior decks. Kansas City enforces a 30-inch frost-depth footing requirement; St. Louis enforces 24 inches. Guardrail height is 36 inches; balusters must reject a 4-inch sphere. Ledger attachment must comply with R507.9 through-bolt requirements and include R507-compliant lateral-load connectors. There is no statewide residential code — technical requirements are locally adopted and locally enforced. | IRC R507 |
| Montana | IRC R507 (Exterior Decks), adopted in Montana's 2021 IRC effective June 9, 2022, governs all residential deck structural requirements: ledger attachment per R507.2.3 (lag screws or through-bolts, never nails), footings below local frost depth per R403.1.4, guards required at surfaces more than 30 inches above grade per R507.9. Montana Code Annotated §33-18-201 prohibits unfair claim settlement practices — misrepresenting policy terms, failing to investigate promptly, or forcing litigation by lowballing settlements. §33-18-232 requires carriers to pay or deny within 30 days of proof of loss (60 if more info is requested) or owe 10% annual interest. The CSI at csimt.gov intakes carrier-conduct complaints. | IRC R507; M.C.A. §33-18-201 |
| Nebraska | Nebraska deck construction is governed by IRC R507 as locally adopted in Omaha, Lincoln, and most cities of 5,000+ population. Nebraska has no explicit statutory deck-matching law for insurance claims, but the Nebraska Department of Insurance regulates unfair claim settlement practices under Neb. Rev. Stat. §44-1539 — carriers cannot refuse payment on a partial deck replacement without a reasonable basis. | IRC R507; Neb. Rev. Stat. §44-1539 |
| Nevada | Nevada has adopted the 2018 International Residential Code as its statewide building standard, with local amendments. Section R507 governs exterior deck construction including footing depth, ledger attachment, lateral-load connectors, joist sizing, and guardrail requirements statewide. | IRC R507; 2018 Nevada Residential Building Code (NRS Chapter 461) |
| New Hampshire | New Hampshire's Unfair Claims Settlement Practices statute at RSA 417:4, XV requires carriers to acknowledge claim communications within ten working days, investigate promptly, and settle fairly once liability is clear. Deck damage claims involving partial board or rail replacement can generate matching disputes — carriers are expected to address visible mismatch on composite decking where weathered and new boards are visually incompatible. Route complaints through insurance.nh.gov. | RSA 417:4, XV |
| New Jersey | New Jersey has adopted the IRC through the Uniform Construction Code (N.J.A.C. 5:23), including the R507 exterior deck provisions. Guardrail height is 36 inches at deck surfaces more than 30 inches above grade; balusters must reject a 4-inch sphere. Frost-depth footing requirements range from 15 inches in South Jersey to 24 inches in northwest NJ counties. Post-Sandy UCC amendments impose enhanced wind-load requirements in shore counties (Ocean, Monmouth, Atlantic, Cape May). Ledger attachment must comply with R507.9 through-bolt requirements and include R507 lateral-load connectors. | IRC R507; N.J.A.C. 5:23 |
| New Mexico | New Mexico deck construction is governed by IRC R507 through CID building code adoption. New Mexico has no explicit statutory deck-matching rule for insurance claims, but the New Mexico Office of Superintendent of Insurance (OSI) enforces unfair claim settlement practices under NMSA 1978 §59A-16-20 — carriers cannot unreasonably refuse partial deck replacement claims where matching is feasible. | IRC R507; NMSA 1978 §59A-16-20 |
| New York | New York adopted the 2025 Residential Code of New York State (effective December 31, 2025), incorporating IRC R507 for exterior decks. Key requirements: footings must bear below local frost depth (36–48 inches depending on region); ledger boards bolted per R507.9 with continuous flashing; lateral-load connections per R507.9.1; guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. New York City projects follow the NYC Building Code with additional PE/RA submission requirements. | IRC R507; 2025 RCNYS |
| North Carolina | North Carolina applies the 2018 NC Residential Code (modified 2015 IRC) statewide for residential deck construction; a 2024 update remains in legislative review. IRC R507 governs framing, footings, ledger attachment, and materials. Coastal 18-county Wind-Borne Debris Region requires decks engineered for 130–150 mph ultimate design wind speeds with hurricane-rated hardware. Guardrails required when walking surface exceeds 30 inches above grade; guard height 36 inches minimum. NCLBGC general contractor license required at $40,000 project threshold; most deck projects fall below. Hurricane Helene (2024) established that lateral-load connectors per R507.9 are the appropriate standard for western NC mountain decks as well. | IRC R507; 2018 NC Residential Code; G.S. §87-1 |
| North Dakota | North Dakota has no statute specifically governing deck material matching after partial storm damage. N.D. Cent. Code §26.1-04-03 bars unfair claim settlement practices, and N.D. Admin. Code ch. 45-14-01 requires carriers to adjust claims in good faith. When hail damages a portion of a composite deck that is no longer manufactured in its original colorway, policyholders should invoke the good-faith settlement requirement in writing, providing photographic evidence that partial replacement creates a visually uniform appearance problem. | N.D. Cent. Code §26.1-04-03 |
| Ohio | Ohio adopted the 2021 IRC through the Ohio Building Code with Ohio amendments. IRC R507 governs exterior decks. Key requirements: footings must bear below local frost depth (24–36 inches depending on county); ledger boards bolted per R507.9 with continuous flashing per R507.2.4; lateral-load connections per R507.9.1; guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Lake Erie snow-belt counties carry 25–30 psf ground snow loads that may affect joist span selections. Enforcement is by local AHJ. | IRC R507; Ohio Building Code 2021 |
| Oklahoma | Oklahoma adopts IRC R507 for exterior deck construction at the municipal level — Oklahoma City, Tulsa, Norman, and Edmond each adopt their own IRC edition and local amendments; unincorporated areas often have no code enforcement. Guardrails required when walking surface exceeds 30 inches above grade; guard height 36 inches minimum. Lateral-load (hold-down tension) connectors required per R507.9 at each post — especially critical given Oklahoma's tornado frequency. Ledger boards must be through-bolted with flashing. Frost depth in northern Oklahoma is 18–24 inches; central and southern Oklahoma has minimal frost depth requirement. | IRC R507; local municipal adoption; Oklahoma CIB |
| Oregon | Oregon deck construction is governed by the 2023 Oregon Residential Specialty Code (ORSC), based on the 2021 IRC with Oregon amendments, effective October 1, 2023. IRC Section R507 (Exterior Decks) governs ledger attachment, post-and-beam sizing, guard-rail height and baluster spacing, and stair design. Frost depth in western Oregon valleys is minimal (0–12 inches); Bend and the Cascades see 18–24 inches; mountain jurisdictions may exceed 24 inches. Ledger flashing with continuous metal and self-adhered membrane is the standard practice on all Oregon deck builds and is critical for moisture management west of the Cascades. | IRC R507; 2023 ORSC (BCD) |
| Pennsylvania | Pennsylvania adopted the 2021 I-codes for permits filed on or after January 1, 2026, including IRC R507 for exterior decks. Key requirements: footings must bear below local frost depth (30–36 inches depending on county); ledger boards bolted per R507.9 with continuous flashing per R507.2.4; lateral-load connections per R507.9.1; guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Enforcement is by local municipal building inspectors. Philadelphia adopted the 2021 I-codes with local amendments on July 1, 2026. | IRC R507; 34 Pa. Code §403 |
| Rhode Island | Rhode Island's Deceptive Trade Practices Act at RIGL §6-13.1 gives homeowners leverage when a carrier forces mismatched partial deck repairs. When storm damage to a composite or wood deck results in partial board or railing replacement, carriers are expected to address visible mismatch to produce a reasonably uniform appearance under the policy's duty of fair and prompt settlement. The 230-RICR-20-05-13 framework reinforces this obligation for hurricane-triggered claims specifically. | RIGL §6-13.1 / 230-RICR-20-05-13 |
| South Carolina | South Carolina deck construction is governed by the 2021 SC Residential Code (IRC-based, effective January 1, 2023), with Section R507 covering exterior decks including ledger attachment (R507.2.3), footing design, post sizing, guardrail height (36 inches when more than 30 inches above grade), and baluster spacing. Coastal WBDR counties require corrosion-resistant hardware per IRC R317 and elevated wind-design fastening schedules. LLR enforces contractor licensing under §40-59 with RSC registration and bond requirements. | IRC R507; 2021 SC Residential Code |
| South Dakota | South Dakota does not have a dedicated matching regulation, but the Deceptive Trade Practices Act at SDCL §37-24-6 prohibits insurers and contractors from concealing material facts in claim settlements. When partial deck damage — particularly to composite decking where weathered and new boards are visually incompatible — results in a mismatched repair, homeowners can assert that the settlement misrepresents the quality and completeness of the repair. The SD Division of Insurance accepts complaints through dlr.sd.gov/insurance. | SDCL §37-24-6 |
| Tennessee | Tennessee has adopted the 2018 IRC through TDCI, including Section R507 (Exterior Decks). Local jurisdictions — Nashville, Memphis, Knoxville, Chattanooga — administer permits and inspections under the same IRC baseline, sometimes with amendments. Guardrail height is 36 inches; balusters must reject a 4-inch sphere; footings must bear below the local frost depth (approximately 12 inches in Middle Tennessee). Ledger attachment must comply with R507.9 through-bolt requirements with R507-compliant lateral-load connectors. | IRC R507 |
| Texas | Texas adopts the IRC by municipality rather than statewide, and most major metros enforce IRC R507 (Exterior Decks) with local amendments. Guard height is 36 inches minimum for residential decks; guardrails required when the walking surface exceeds 30 inches above grade. Lateral-load (hold-down tension) connections required on all attached decks per R507.9. Footings must bear on solid ground at the required depth per the local frost and soil provisions — North Texas clay soil typically requires 24–36 inch depths. TWIA coastal counties require design for elevated wind speeds with WPI certification. | IRC R507; local amendments vary by municipality |
| Utah | Utah has adopted the 2021 International Residential Code as the basis for its statewide residential building code (Utah Code §15A). Section R507 governs exterior deck design including footing depth, ledger attachment, lateral-load connectors, joist sizing, and guardrail requirements, with Utah amendments for high-snow-load zones. | IRC R507; Utah Code §15A (2021 IRC base) |
| Vermont | Vermont's Fair Claims Practices Regulation I-79-2, authorized by 8 V.S.A. §4724(9), sets minimum claim-handling standards: insurers must acknowledge a claim within 10 business days, accept or deny within 15 business days of a complete proof of loss, and pay agreed amounts within 10 business days. Denials must cite the specific policy provision in writing. For deck damage claims, the coverage question — Coverage A (attached deck) versus Coverage B (freestanding structure, typically a 10% sublimit) — should be clarified with your carrier in writing before any major deck project. After the 2023 and 2024 flood disasters, DFR has emphasized prompt, documented handling of Vermont property claims. | Reg. I-79-2 / 8 V.S.A. §4724 |
| Virginia | Virginia adopted the 2021 IRC through the Uniform Statewide Building Code (USBC, 13 VAC 5-63) with Virginia amendments. IRC R507 governs exterior decks across the Commonwealth. Key requirements: footings must bear below local frost depth (14–20 inches Tidewater, 24–28 inches Northern VA, 30–36 inches Shenandoah Valley/highlands); ledger boards bolted per R507.9 with continuous flashing per R507.2.4; lateral-load connections per R507.9.1; guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Hampton Roads coastal areas apply ASCE 7-22 elevated wind-speed design requirements that may exceed IRC prescriptive tables. Enforcement is by local building departments. | IRC R507; USBC 13 VAC 5-63 |
| Washington | Washington adopted the 2021 IRC with state amendments (WSRBC) effective March 15, 2024, including Section R507 for exterior decks. Key requirements: ledger boards bolted per R507.9 with continuous flashing per R507.2.4; lateral-load connections per R507.9.1; seismic hold-down hardware required in Seismic Design Category D (Puget Sound lowland); guards required when deck surface exceeds 30 inches above grade; minimum guard height 36 inches; baluster spacing not to allow a 4-inch sphere to pass. Eastern Washington frost depths run 12–24 inches for Spokane area; western Washington frost depth is minimal. Local authority having jurisdiction (AHJ) enforces and may amend. | IRC R507; WSRBC 2021 |
| West Virginia | West Virginia deck construction is governed by IRC R507 in counties and municipalities that have adopted a residential building code. West Virginia has no explicit statutory deck-matching rule for insurance claims. The West Virginia Insurance Commissioner enforces unfair claim settlement practices under WV Code §33-11-4 — carriers cannot unreasonably refuse to pay on partial deck replacement claims where matching is feasible. | IRC R507; WV Code §33-11-4 |
| Wisconsin | Wisconsin deck construction is governed by the statewide Uniform Dwelling Code (Wis. Admin. Code SPS 320–325), which incorporates IRC Section R507 for exterior decks. Frost-depth requirements run from 36 inches in the Milwaukee/Madison area to 42–48 inches in IECC climate zone 7 northern counties, enforced at the local permit level. Ledger attachment must comply with IRC R507.2.3 with through-bolts or lag screws, continuous flashing, and lateral-load connectors. ATCP 110 governs home-improvement contracts with mandatory written elements and a 3-business-day cancellation right for at-home signings. | IRC R507; Wis. Admin. Code SPS 321 |
| Wyoming | Wyoming's Unfair Claims Settlement Practices Act at W.S. §26-13-124 prohibits carriers from misrepresenting policy provisions, failing to acknowledge claim communications promptly, or failing to affirm or deny coverage within a reasonable time after proof of loss. Paired with W.S. §26-15-124, carriers acting without reasonable cause owe the insured 10% interest plus attorney fees. The Wyoming Department of Insurance enforces these standards through its Consumer Affairs Section at doi.wyo.gov. For deck-damage claims, the coverage question — Coverage A (attached deck) versus Coverage B (freestanding, 10% sublimit) — should be clarified with your carrier in writing before any major deck project. | W.S. §26-13-124 |
Rows marked “Research pending” link to our state deck guide, which covers the state’s contractor licensing, permit process, and local amendment context. We expand state-specific code research one state at a time; if you’re planning a deck project, confirm current requirements directly with your local building department before finalizing the design.
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