Louisiana is one of the most code-evolved states in the country, and that evolution did not happen because anyone wanted it. It happened because Hurricane Katrina exposed what no statewide building code looked like, and Hurricane Ida — sixteen years later, almost to the day — proved that the post-Katrina code still has more growing to do. Designing in Louisiana means designing inside a regulatory environment that is younger and more actively revised than almost anywhere else in the United States.
This page is the Louisiana-specific landing for WindLoadCalc. Enter a Louisiana ZIP code above and the calculator launches preloaded with the correct ASCE 7-16 design wind speed for that location, the parish it sits in, and the project structure ready for you to enter occupancy, geometry, and exposure.
What "Louisiana-ready" actually means here
Three things have to be right for a Louisiana wind load calculator to be useful: (1) it reads the ASCE 7-16 wind speed contours that the current LSUCC adoption references; (2) it returns the correct parish name (not "county" — Louisiana never uses that word for civil subdivision); and (3) it outputs a report a Louisiana plan reviewer can verify against the referenced ASCE figures and equations. WindLoadCalc does all three.
Louisiana Wind Speed Quick Reference
The table below lists representative design wind speeds for major Louisiana regions, Risk Category II (the most common occupancy — single-family, most multifamily, retail, light commercial), under ASCE 7-16 as referenced by the current LSUCC adoption. These are baseline approximations for orientation only; the calculator above returns the exact value for your specific ZIP code.
| Region / Parish | Risk Cat II Wind Speed | Notes |
|---|---|---|
| Cameron Parish Coast | 150–160 mph | Southwest LA coast; Hurricane Laura 2020 landfall |
| Plaquemines Parish Coast | 150–160 mph | Mississippi River delta; most exposed parish |
| St. Bernard Parish Coast | 150–160 mph | East of New Orleans; Katrina 2005 devastation |
| Orleans Parish (New Orleans) | 150–160 mph | City of New Orleans; historic district overlays in French Quarter |
| Jefferson Parish (Metairie, Kenner) | 150–160 mph | Greater New Orleans west; Hurricane Ida 2021 eyewall |
| Lafourche / Terrebonne (Houma, Thibodaux) Coast | 150–160 mph | South coastal LA; heavy Ida 2021 damage |
| Calcasieu Parish (Lake Charles) Coast | 150–160 mph | SW LA; Laura + Delta 2020 double-hit |
| East Baton Rouge Parish (Baton Rouge) | 130–140 mph | State capital; inland from coast |
| Lafayette Parish | 130–140 mph | Acadiana region; central south LA |
| St. Tammany Parish (Covington, Slidell) | 140–150 mph | North shore Lake Pontchartrain |
| Caddo Parish (Shreveport) | 110–120 mph | North LA; lowest design speeds in state |
| Ouachita Parish (Monroe) | 110–120 mph | Northeast LA; comparable to Shreveport |
Verify the exact value for your ZIP
These ranges are baseline orientations only. ASCE 7-16 contours cross parish boundaries in places, and the gradient from 160 mph at the Gulf to 110 mph at the Arkansas line is steep. Risk Category III (assembly, schools) and Risk Category IV (hospitals, essential facilities) use higher speeds. Always run the calculator for your specific project address before designing or submitting.
The Post-Katrina LSUCC Origin Story
It is hard to overstate how unusual Louisiana's pre-2005 building code situation was. Before Hurricane Katrina, Louisiana had no statewide building code at all. A handful of parishes — primarily Orleans, Jefferson, and a few suburban parishes around Baton Rouge — enforced model codes like the Standard Building Code (the regional pre-IBC code published by the Southern Building Code Congress International). The rest of the state, including most rural parishes and large stretches of the central and northern regions, enforced little or nothing. There was no statewide wind design requirement. There was no requirement that new residential construction even meet a minimum standard.
Hurricane Katrina made landfall on August 29, 2005. The storm killed more than 1,800 people, caused over $125 billion in damage, and produced one of the most documented post-storm forensic engineering investigations in American history. The Federal Emergency Management Agency's Mitigation Assessment Team reports — published over the following two years — catalogued the specific failure modes that ran through south Louisiana residential construction: insufficient roof-to-wall connections, undersized roof sheathing nailing, unrated overhead doors, garage doors that failed first and then admitted wind that lifted off entire roofs. Almost every one of those failures traced back to construction built to no enforceable code.
The Louisiana legislature responded faster than legislatures usually move. Act 12 of 2005, passed in a special session immediately after Katrina, created the Louisiana State Uniform Construction Code (LSUCC) and the Louisiana State Uniform Construction Code Council (LSUCCC) to administer it. The Act made the LSUCC the mandatory minimum building code for the entire state — every parish, every municipality, every project. The first adopted edition referenced the International Building Code, the International Residential Code, and ASCE 7 for wind and seismic loads. Phased rollout ran through 2006 and 2007, with full statewide enforcement in place by the latter year.
Louisiana went from no code to a model code in 24 months
Most state-level building code reforms take a decade. Louisiana went from no enforceable wind code anywhere in the state to a uniform statewide standard in approximately two years — a legislative response so disproportionate to the previous baseline that academic policy analysts have studied it as a case in disaster-driven regulation. The cost of that delay before Katrina was the cost of the storm itself.
The LSUCC has been on a regular update cycle since. The 2009 edition aligned to the 2006 IBC/IRC. The 2012 update adopted the 2009 codes. Subsequent revisions in 2015 and 2018 progressively brought the state to current ASCE 7 references. The most recent adoption, effective January 1, 2023, references the 2021 IBC, 2021 IRC, and ASCE 7-16 as the wind load standard. A future cycle — currently expected in the next adoption window — will likely move Louisiana to ASCE 7-22, but as of this writing, projects in any Louisiana parish design to ASCE 7-16.
Hurricane Ida 2021 + Laura/Delta 2020 — What the Code Learned
The post-Katrina LSUCC built a baseline. Two more decades of hurricanes tested it.
Hurricane Laura — Category 4 at Cameron Parish landfall
The strongest hurricane to hit southwest Louisiana since 1856 made landfall near Cameron with 150 mph sustained winds. Lake Charles took catastrophic damage. Buildings constructed to early LSUCC editions (2007-2010) performed measurably better than older stock, but mid-rise commercial structures showed roof system failures driven by uplift in a wind field the original ASCE 7-05 design assumptions underestimated.
Hurricane Delta — Category 2 over Calcasieu (six weeks later)
Delta made landfall almost in the same location as Laura. Many roofs and envelopes already compromised by Laura but not yet repaired failed completely under Delta. The double-hit produced one of the largest construction-recovery contractor surges in modern Louisiana history and exposed how brittle partially-repaired structures are to follow-on wind events.
Hurricane Ida — Category 4 on the 16th anniversary of Katrina
Ida made landfall at Port Fourchon (Lafourche Parish) with 150 mph sustained winds and pushed the eyewall through Jefferson, St. Charles, and lower St. John the Baptist parishes. Most post-Katrina LSUCC-era construction in Jefferson Parish performed as designed. The most damaged buildings clustered in older sections of Houma, Thibodaux, and the lower-lying parts of Lafourche where pre-LSUCC residential stock dominates. Ida did not trigger a new code in itself but accelerated specific revisions in the next LSUCC cycle.
Hurricane Francine — Category 2 over Terrebonne
Francine struck the same general corridor as Ida three years later but at lower intensity. Post-Ida repair work plus tightened LSUCC enforcement in southern Lafourche and Terrebonne produced visibly better outcomes than 2021. The storm is now cited in LSUCCC adoption discussions as evidence that the regulatory direction is correct, even though the work is incomplete.
The pattern across these four storms is consistent: structures built to current LSUCC standards generally hold; structures built before LSUCC enforcement matured generally fail at rates the engineering forensics teams now expect. The narrower lesson — and the one most relevant for designers running new wind load calculations — is that the ASCE 7-16 wind speeds the LSUCC references are calibrated against observed performance in these specific storms, and using anything less is not conservative.
The Louisiana Parish System — Why It Matters for Permitting
Louisiana is the only U.S. state where civil subdivisions are called parishes, not counties. The terminology traces to the French colonial period and the Catholic ecclesiastical structure that administered local governance before the Louisiana Purchase. When the territory became a U.S. state in 1812, the parish system was kept in place — entirely as a matter of legal continuity — and 64 parishes have administered local civil functions ever since.
For wind load and permit work, this matters in three ways:
- Terminology in submittals. Plan reviewers, permit applications, sealed drawings, and code references in Louisiana always say "parish," never "county." Calling it the wrong word marks you as out-of-state and can slow a permit review while the reviewer satisfies themselves your work is otherwise locally informed.
- Permit authority lives at the parish level. The LSUCC is the statewide minimum, but enforcement and permit issuance happen at the parish or municipality level. Some parishes have unified permit offices; others delegate to incorporated cities. New Orleans (Orleans Parish) has the Department of Safety and Permits; Jefferson Parish has its own Department of Inspection and Code Enforcement; East Baton Rouge runs through the City-Parish of Baton Rouge.
- Local overlays exist on top of the LSUCC. The LSUCC sets the floor. Specific parishes — particularly Orleans for the French Quarter and Tremé historic districts — layer additional review requirements on top. The wind load calculation does not change, but the documentation expected at submittal can be more extensive in historic-overlay zones.
WindLoadCalc returns the parish name automatically for any Louisiana ZIP entered. If your project address spans two ZIPs or sits near a parish line, run the address (not the ZIP) to be sure the parish on the report matches the parish that will be reviewing the permit.
Get Pressures for Your Louisiana Project
Enter your ZIP, pick your risk category, and get a Louisiana parish-aware C&C report in under 15 minutes.
Start Free TrialHow to Calculate Your Louisiana Wind Load
Enter your Louisiana ZIP code
The calculator looks up the ZIP, returns the correct Louisiana parish, and pulls the ASCE 7-16 design wind speed from the contour maps. Coastal parishes (Cameron, Plaquemines, Orleans, Jefferson, Lafourche, Terrebonne, Calcasieu) return 150-160 mph baseline values; inland north parishes drop progressively to 110 mph.
Pick your Risk Category
Risk Category II covers most occupancies (single-family, multifamily, retail, most commercial). Risk Category III covers assembly buildings, schools, and substantial-hazard facilities. Risk Category IV is for essential facilities (hospitals, fire stations, emergency operations centers). The design wind speed scales upward with the risk category at the same location.
Set Exposure Category and building geometry
Exposure C is the Louisiana default for most suburban and rural sites — open terrain with scattered obstructions. Exposure B applies for sites shielded by surrounding buildings or dense trees on all sides (urban interior of New Orleans, dense parts of Baton Rouge). Exposure D applies for coastal sites within a mile of unobstructed open water — most of Cameron, Plaquemines, and the Gulf-facing fringe of other coastal parishes. Then enter building length, width, mean roof height, roof slope (X over 12), and roof shape.
Review the calculated pressures
The calculator returns MWFRS pressures (for the lateral force-resisting system) and Components and Cladding pressures (for individual windows, doors, and cladding elements). C&C output includes zone breakdowns — Zone 4 (wall field), Zone 5 (wall corner), and the corresponding roof zones for your roof type. Every pressure cites the specific ASCE 7-16 figure or equation it comes from.
Hand the report to your Louisiana-licensed PE for seal
Louisiana requires a state-licensed PE to seal structural submittals. WindLoadCalc produces the calculation; the seal must come from a PE licensed by the Louisiana Professional Engineering and Land Surveying Board (LAPELS). Our in-house PE is Florida-licensed only and does not seal out-of-state work — but the report is structured to make a Louisiana PE's review and seal straightforward.
Plain-English glossary (for non-engineers reading this)
- LSUCC
- Louisiana State Uniform Construction Code — the statewide minimum building code, administered by the LSUCCC, currently referencing 2021 IBC/IRC and ASCE 7-16.
- ASCE 7-16
- The American Society of Civil Engineers Standard 7 (2016 edition) — the load standard the LSUCC references for wind and seismic design.
- Parish
- Louisiana's term for what other states call a county. There are 64 parishes.
- MWFRS
- Main Wind Force Resisting System — the structural system (shear walls, diaphragms, moment frames) that resists wind loads on the whole building.
- C&C
- Components and Cladding — individual elements (windows, doors, panels, fasteners) that resist wind locally over their tributary area.
- Risk Category
- ASCE 7 classification (I, II, III, IV) that scales design wind speed by the consequence of a building's failure. Hospitals and EOCs (IV) use higher wind speeds than residences (II) at the same location.
- Exposure Category
- How exposed the site is to open wind. B is sheltered/urban; C is open terrain with scattered obstructions (most of Louisiana); D is coastal within a mile of open water.
Major Louisiana Parishes — Wind Design At-A-Glance
Orleans Parish
City of New Orleans. ZIPs 70112, 70115, 70116, 70124, 70130. Historic district overlays in French Quarter and Marigny add documentation requirements at submittal.
East Baton Rouge Parish
State capital. ZIPs 70801, 70806, 70808. Inland location pulls design speeds down meaningfully from coastal parish numbers.
Calcasieu Parish
Lake Charles. ZIPs 70601, 70605, 70611. Hit by Laura (2020) + Delta (2020) consecutive landfalls; substantial post-storm construction underway through mid-2020s.
Lafayette Parish
Acadiana region center. ZIPs 70501, 70503. Central south LA; inland from Gulf but coastal-adjacent enough to need careful Exposure category selection.
Terrebonne Parish
Houma. ZIP 70360. Coastal South LA; eyewall corridor of Hurricane Ida (2021). High pre-LSUCC residential stock means new construction here is reshaping the local building inventory.
Caddo Parish
Shreveport. ZIP 71101. Northwest LA. Lowest design wind speeds in the state — far enough inland that Gulf hurricanes are spent by the time they arrive (though tornado risk picks up).
More Wind Load Resources
Louisiana Wind Load FAQ
Why does Louisiana use parishes instead of counties?
How did Hurricane Katrina change Louisiana building codes?
What is the design wind speed in New Orleans versus Lake Charles?
Did Hurricane Ida 2021 trigger new Louisiana code updates?
Does WindLoadCalc support Louisiana State Uniform Construction Code?
Do I need a Louisiana PE to seal my wind load report?
What are coastal parish wind speeds in Louisiana?
How does Louisiana's wind code compare to Florida's?
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View Plans & Start TrialLast updated: May 23, 2026. Reflects LSUCC adoption effective January 1, 2023 (2021 IBC/IRC + ASCE 7-16). WindLoadCalc has been computing wind loads for U.S. permit submittals since 2002.