This is where WindLoadCalc started. 170 mph design wind speed, ASCE 7-22, FBC 8th Edition — auto-applied to every Collier ZIP from Old Naples to Immokalee.
Most calculators land in Naples as visitors. This one was born here.
WindLoadCalc.com was created in Naples in 2002 as a local wind load service for Collier architects and engineers.
The web version launched in 2006 — among the very first online wind load calculators ever published.
Lanai shops, pool-cage builders and custom-home GCs across every Collier ZIP have run their numbers through us across three named storms that hit while we were live.
The 170 mph county speed has stayed locked in through every code cycle since.
One tick above the rest of southwest Florida, calibrated to a storm record few counties match.
Run a clean ASCE 7-22 map across Lee, Charlotte and Sarasota and the contours sit in the 150–160 mph band at Risk Category II.
Collier alone is pushed to 170 mph.
The reason is observed performance during four landfalls inside the county line — the storm climatology the modern Collier number is built around:
The 170 mph override applies uniformly — beachfront Vanderbilt or 25 miles inland in the Estates, same number.
There is no toggle and no "is this Lee or Collier" step. Enter a Collier ZIP, get 170 mph.
At a fixed 170 mph, the exposure category swings calculated pressures 15–25%.
Gulf-front parcels usually calc Exposure D; inland Estates and Immokalee run Exposure C. The calculator prompts for it and documents the call.
What changes from Marco to Immokalee is exposure, not the design wind speed.
| Area | ZIP | Risk Cat II | Typical exposure |
|---|---|---|---|
| Old Naples / Downtown | 34102 | 170 mph | D near Gulf, C otherwise |
| Park Shore / Moorings | 34103 | 170 mph | D coastal, C inland |
| North Naples / Vanderbilt Beach | 34108 | 170 mph | D coastal, C inland |
| East Naples / Lely | 34112, 34113 | 170 mph | C |
| Golden Gate Estates (east) | 34117, 34119 | 170 mph | C |
| Marco Island | 34145 | 170 mph | D (Gulf-exposed) |
| Immokalee | 34142 | 170 mph | C (inland) |
| Everglades City / Chokoloskee | 34139, 34138 | 170 mph | D (10,000 Islands) |
Exposure D applies when open water sits within one mile upwind of the sector being analyzed — a bayside Naples lot can be D from the Gulf and C from the east.
Risk Category III (assembly, larger schools) and Risk Category IV essential facilities (NCH Naples Hospital, Physicians Regional, the Collier EOC, fire stations) push above 170 mph at the same address.
Always run your actual address and occupancy.
And the one scope where the ASCE 7-22 enclosure call matters most.
A screened Naples lanai is rarely Enclosed and rarely Open in the strict ASCE 7-22 sense.
Under the old code it got forced into Open or Partially Enclosed — internal pressure landing at 0 or ±0.55, neither matching what screen mesh actually does.
ASCE 7-22 added the fourth category, Partially Open, with GCpi = ±0.18 — a coefficient that tracks observed behavior.
The calculator carries all four enclosure types and applies the right one automatically.
Strong wind speed, but a different product-approval pathway than Miami.
The High Velocity Hurricane Zone legally covers only Miami-Dade and Broward. Collier runs the statewide Florida Product Approval (FL#) pathway.
Miami-Dade NOA stamps are accepted when a matching FL# exists, but TAS 201/202/203 testing is never mandated here.
A product carrying only an NOA, with no FL#, is not legal to install in Collier even though it's plenty strong. The contractor pulls a separate FL# or picks another unit.
The report names the design pressure per opening so the FL# match is direct.
Every glazed opening in new construction and substantial renovation must be protected. No opt-out anywhere inside the county line.
Same coast, different design basis at every county line.
Panhandle through the Keys. Start here if your project crosses county lines.
Florida's strictest. NOA approvals and TAS 201/202/203 testing on every opening.
Same speed as Collier, full HVHZ rules — NOA mandatory, not optional.
Atlantic coast, FL# pathway like Collier, east-coast climatology.
Collier and Broward both run 170 mph at Risk Category II — and that's where the similarity ends.
Broward is HVHZ, so NOA approvals and three TAS test standards apply on every opening. Collier is statewide-FBC on the FL# pathway.
A Collier-approved product (FL# only) is not automatically legal in Broward; a Broward product (NOA + matching FL#) is fine in Collier.
Our in-house P.E. is Florida-licensed and works this market. The license scope is Florida residential and small commercial up to 3 stories.
That covers essentially every Collier residential job by volume: lanais, pool cages, raised lanais, screen enclosures, window-and-door replacements, accessory structures, single-family custom homes and two-story townhouses.
The software produces an Engineering Report. The PE sign-and-seal is a separate service you request at submittal, with turnaround typically inside one business day. See plans and pricing →
The 8th Edition (2023) took effect statewide on December 31, 2024.
FBC 8th adopts ASCE 7-22 in place of 7-16 — new wind speed maps, a reorganized Chapter 30 for Components and Cladding, and the brand-new Partially Open enclosure type at GCpi = ±0.18.
For a screened Naples lanai, that single addition produces noticeably more rational numbers than the same project returned under the 2017 code.
From ZIP to permit-ready report in under 15 minutes.
The county registers the moment you finish typing and stamps 170 mph onto the project header — no override step, no risk of pulling the Lee County 150 mph value into a Naples submittal.
Most Collier permits are Cat II. Cat III covers larger schools and assembly. Cat IV maps to NCH Naples Hospital, Physicians Regional, the Collier EOC and fire stations. Each tier scales the 170 mph base up.
Exposure D for beachfront Naples and west Marco; Exposure C for inland Collier; Exposure B is rare here. Add footprint, mean roof height, pitch and roof shape — the calculator picks the Chapter 30 procedure.
Export to PDF, Excel or the architectural schedule .xlsx. For residential up to 3 stories you can request a Florida PE sign-and-seal at submittal, usually back inside one business day.
170 mph at Risk Category II, under ASCE 7-22 and FBC 8th Edition. Collier fixes that number at the county level, so it holds across every Naples ZIP — 34102, 34103, 34108, 34109, 34110, 34112, 34113, 34114, 34117, 34119.
Risk Category III and IV occupancies (schools, NCH Naples Hospital, the Collier EOC, fire stations) scale up from the 170 mph base. Run the calculator on your actual address rather than reading the map.
No. The High Velocity Hurricane Zone legally covers only Miami-Dade and Broward. Collier sits outside it, so Miami-Dade Notice of Acceptance (NOA) approvals and TAS 201, 202 and 203 testing are not mandated here.
Collier runs on the statewide Florida Product Approval (FL#) pathway.
The wind speed is still a serious 170 mph at Risk Category II — but the document a Naples plan reviewer wants on the opening schedule is an FL# number, not an NOA.
Because the firm started here. WindLoadCalc.com was created in Naples in 2002 as a local wind load service for Collier architects and engineers, four years before the web version launched in 2006.
We have carried Collier's 170 mph number through FBC adoption cycles from FBC 2001 to FBC 8th Edition (2023), and watched the post-storm code response to Wilma, Irma and Ian land in the calculator one revision at a time.
No other online wind load tool has two decades of files in this specific market.
A baseline ASCE 7-22 read of Lee, Charlotte and Sarasota lands in the 150 to 160 mph band at Risk Category II.
Collier is one tick higher at 170 mph, calibrated to a storm record few counties match:
The velocity finder applies the 170 mph override automatically on every Collier ZIP.
A screened lanai or pool enclosure anywhere in Collier is designed for the full 170 mph county wind speed, applied as Components and Cladding pressures to:
The catch is internal pressure: a screened lanai is rarely Enclosed and rarely Open in the strict ASCE 7-22 sense.
It usually falls in the Partially Open category that ASCE 7-22 introduced, with GCpi = plus or minus 0.18. The calculator carries all four ASCE 7-22 enclosure types and applies the right GCpi automatically.
Yes. Every square inch of Collier sits inside the FBC Windborne Debris Region, so glazed openings in new construction and substantial renovations must be protected.
Compliant options include impact-rated windows and doors (large missile impact per ASTM E 1996 / E 1886), accordion or roll-down shutters, panel shutters, or — under the FBC alternate provisions — plywood at the prescribed thickness and fastener pattern.
The report lists the C&C design pressure for each opening so the contractor can match a compliant FL# product to every window, door and shutter.
The wind speed does not — both are 170 mph at Risk Category II. The exposure category does, and that single input moves calculated pressures 15 to 25 percent.
Marco Island (34145) faces open Gulf with little upwind obstruction, so most parcels run Exposure D from the west and south.
Naples is mixed: a Gulf-front lot is Exposure D from the water and often Exposure C from the east, and a quarter mile inland the whole project usually drops to Exposure C.
The calculator prompts for exposure and documents the call so it survives plan review.
Yes, and Collier is the home market for it. Our in-house P.E. is Florida-licensed, scoped to Florida residential and small commercial up to 3 stories — which covers essentially every Collier residential job by volume:
The software output is an Engineering Report; the PE sign-and-seal is a separate service you request at submittal. Turnaround typically runs inside one business day.
170 mph ASCE 7-22 + FBC 8th Edition pressures for any Collier ZIP, built by the people who've run Naples wind loads since 2002.
Try the free wind speed lookup first, or start a full trial.