Codes & permits · 7 min read
Florida building codes, NOA, and what they actually mean
HVHZ, Miami-Dade NOA, Florida Product Approval, design pressure — decoded for homeowners, not engineers.
Two approval systems, one state
Florida runs two parallel product-approval programs. The Florida Product Approval (FL number) covers products legal anywhere in the state outside HVHZ. The Miami-Dade Notice of Acceptance (NOA) is stricter and is the only approval that satisfies HVHZ — Miami-Dade and Broward Counties, plus coastal Palm Beach. A product can carry both; many do.
Why HVHZ exists
After Hurricane Andrew leveled Homestead in 1992, Florida engineers found that the failure point wasn't the structure — it was the windows. A breach turned every house into a parachute. HVHZ rules force impact resistance plus higher wind-load testing because the corridor from Homestead to Jupiter sees Cat 4–5 risk more often than anywhere else in the continental U.S.
Design pressure, in plain English
Design pressure (DP) is the wind force a product is rated to handle, measured in pounds per square foot. A typical Florida residential window faces a DP requirement between +45/-50 and +75/-90 depending on location, building height, and exposure category. Your installer should pull the actual DP for your home from the local code official, not estimate it.
What to ask for in writing
Three numbers and one document. The product's FL approval number (or Miami-Dade NOA number if you're in HVHZ), the DP rating for your specific opening, the wind exposure category, and a signed permit application. If your installer can't or won't produce these, walk away.