Guide
How to Pick the Right Gutter Size for Your Florida Home
5-inch vs 6-inch vs 7-inch gutters, downspout sizing, and how Florida rain volume changes the math.
Why size matters in Florida specifically
Florida averages 50+ inches of rain a year, with summer thunderstorms that drop 1+ inches in under an hour. Standard 5-inch gutters can overflow during these bursts. Most Orlando-area homes already have 6-inch gutters, and that is what we recommend by default for new installs and replacements.
When 5-inch is enough
5-inch K-style is the older Florida standard and still works in three specific scenarios: small single-story homes under about 1,400 square feet with simple roof geometry; secondary structures like detached garages or guest cottages where the roof footprint is small; and homes whose original 5-inch gutters are still in good shape and the homeowner wants like-for-like replacement to match the existing trim line. If your roof is over 1,800 square feet, has any complex valleys that funnel water to a single corner, or sits under heavy oak or pine canopy, 5-inch is going to overflow during a real Florida cloudburst — even when it is perfectly clean. We will tell you on the estimate which size your roof actually needs based on its square footage and pitch, not on what the previous contractor put up there.
Downspout sizing rule
A gutter is only as good as its downspouts. The rule we use: one downspout per 30 to 35 linear feet of gutter, with at least one corner downspout per roof side. Sizes are simple — 3×4 oversized rectangular for residential is our default at $6 per linear foot, 4×5 commercial-grade at $8 per linear foot for properties with very long runs, two-story homes, or commercial buildings. The old 2×3 size you see on 1990s homes moves about 40% less water than a 3×4 — during a real Florida summer storm, a 2×3 simply cannot keep up and the gutter overflows even when the downspout itself is clean. If you are replacing gutters anyway, upsizing the downspouts at the same time costs almost nothing extra and solves the most common cause of foundation water damage. Buried 4-inch corrugated drain extensions to carry the water away from the foundation add $50 to $150 per run; we recommend them on flat lots and any property where the lot grade pitches back toward the house.