Licensed professional engineers · 38 states + DC + USVI
Wind load calculations for your project.
We help contractors, homeowners and design teams determine the wind loads their doors, windows, roofing, solar panels and equipment need to resist. Send us the project details; we review the installation, calculate the applicable loads and prepare the engineering documentation for your permit.
- 2–3 days
- Most standard packages, after complete project information
- 38 states
- Firm licensure + DC & USVI
- 5.0 ★
- 127 Google reviews
- $249
- Set-price packages from
What we do
What can we help you with?
Pick the component. Every calculation is site-specific and the documentation is prepared and sealed by a Professional Engineer licensed in your state.
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Doors & windows
From $399 · 2–3 days
See details → -
Roofing
From $459 · 2–3 days
See details → -
Solar
From $499 · 2–3 days
See details → -
Rooftop equipment, fences & signs
From $249 · 2–3 days
See details → -
Light & camera poles
From $450 · 2–3 days
See details → -
Florida & HVHZ certificates
From $399 · Miami-Dade, Broward, Palm Beach
See details →
Send the project details and we’ll help you identify the right scope. All services & prices
Free tool
Want to see the design pressures first?
Enter the ZIP, the height and the opening or roof area. You get ASCE 7-22 design pressures by zone and the product rating to look for, with a 3-page report by email. Planning results depend on what you enter; the engineering service includes a review of your project.
A storm hit and you have a claim? Look up the recorded gusts at the address →
Example · 160 mph · Exposure C · 20 ft
±45 psf
Product rating to look for · corner window (zone 5), 20 sq ft
Design pressures +57 / −74 psf (strength), +34 / −45 psf (ASD). Estimate only; not a sealed document.
Standard packages
Scope and price listed upfront.
Standard single-family packages with the scope and price listed upfront. Commercial and custom work receives a written proposal.
How it works
Send what you have.
Product approvals, a contractor’s quote, phone photos, a roof plan: whatever you have is a start. We’ll review it and let you know what else we need.
- 1
Send the project details
About two minutes online: address, what is being installed, the product approvals, photos or plans. Standard packages are paid at the end; custom work receives a written proposal.
- 2
We review and calculate
A licensed engineer reviews the installation, calculates the ASCE 7-22 loads at your address, height and zone, and compares them with the product approval or pole data. If something is missing, we ask before work starts.
- 3
You receive the documentation
The signed and sealed letter or calculation package, prepared for permit review, usually within 2–3 business days of complete information. If the product does not meet the pressure, we explain what we found and what is needed next.
Questions
Why does the permit want a wind letter if my product is already approved?
The approval says what the product resists in a lab. The permit office also wants to know what your opening, roof or pole must resist at your address, height and zone, and proof the rating covers it. The letter connects the two.
How fast, and what does it cost?
Standard packages for single-family homes start at $249 and are usually completed within 2–3 business days after we receive the required project information. Commercial and unusual work receives a written proposal; the pricing page lists typical ranges by service.
Do you work outside Florida?
Yes. Set-price packages exist for North Carolina, Boulder County and Austin, and custom work is available in the 38 states plus DC and the USVI where the firm is licensed. The request checks your state first.
From the founder
“I’m Enrique Lairet, PE. My goal with WindCalculations.com is to make it easier to get the wind engineering a project needs, and to understand what the results mean. A product approval is the starting point; the next step is checking how that product will be used at your site.”
More about WindCalculations →Ready to send your project?
About two minutes online. A licensed engineer reviews the details and you see the price or the proposal before any work begins.
Request wind calculations