Have a question? Need an Estimate?

(725) 502-3114

5-Inch vs 6-Inch Gutters: What We Install in Las Vegas and Why

Written October 8, 2026. Rainfall and capacity figures were read the same day.

Key Takeaways:
Of 123 new-gutter jobs we installed or booked from January through October 2026, 116 were 6-inch and 7 were 5-inch.
A 6-inch K-style gutter holds about 40 percent more water per foot than a 5-inch, and it pairs with a 3x4-inch downspout that has twice the opening of a 2x3.
Gutters here are sized for the hardest five minutes, not for the year's total. NOAA puts the 5-minute burst that comes about once in 10 years in downtown Las Vegas at a rate of 3.30 inches per hour.
A 5-inch gutter is still the right call on a small roof plane or a short run.

Should a Las Vegas home get 5-inch or 6-inch gutters?

Most of the homes we gutter now get 6-inch. Of 123 new-gutter jobs we installed or booked from January through October 2026, 116 were 6-inch and 7 were 5-inch. That is about 94 of every 100.

A 5-inch gutter is not a mistake. Our own K-style page says a 5-inch with properly spaced downspouts handles a standard tract home, and most of the homes we have installed on over the years have 5-inch. The rest of this post is the numbers behind the bigger size: how much more it holds, how hard rain falls here, and what a tile roof does to the water.

How much more water does a 6-inch gutter hold?

About 40 percent more per foot. That is the figure on our K-style page. A company that builds the machines seamless gutters are formed on publishes the same one: a 6-inch "holds about 40% more water."

Published numbers do not all agree. The same maker's 6-inch page says "nearly 50%" in one place and, in a table, about 2 gallons per foot for 6-inch against 1.2 for 5-inch, which is about two-thirds more. We use 40 percent because it is the lowest of them.

The trough is half of it. The downspout is the other half.

What changes5-inch K-style6-inch K-style
Water held per footThe baselineAbout 40 percent more
Downspout it pairs with2x3-inch3x4-inch
Downspout opening6 square inches12 square inches
Roof plane the machine maker matches it toUsually 600 to 800 square feetLarger planes. Over 1,400 square feet calls for 6-inch in most areas

A roof plane is one flat face of the roof, the part that drains to one run of gutter.

Why does a town with 4 inches of rain a year need the bigger gutter?

Because a gutter is sized for the hardest few minutes, and ours are hard. A normal year brings 4.18 inches, by the National Weather Service. NOAA Atlas 14, the federal rainfall atlas, shows how fast that rain can arrive in downtown Las Vegas:

  • The 5-minute burst that comes about once in 10 years falls at a rate of 3.30 inches per hour. That is about a quarter inch of water in five minutes.
  • The 15-minute burst that comes about once in 10 years falls at 2.08 inches per hour, about half an inch in a quarter hour.
  • The once-in-100-years bursts run 5.95 inches per hour for 5 minutes and 3.74 for 15.

The rates are not the same across the valley. At the site of the flood control district's northwest Summerlin rain gauge, the atlas puts the same 10-year, 5-minute burst at 3.86 inches per hour, about 17 percent harder than downtown.

The machine maker's advice reads as if it were written for this valley. In a dry climate, it says, a 5-inch gutter is fine for any size roof. Then it adds that in "a dry area with seasonal strong storms," a 6-inch may be the better choice.

Now put a roof under those rates. The U.S. Geological Survey figures one inch of rain on a 40-by-70-foot roof at about 1,743 gallons. That works out to a little over six-tenths of a gallon per square foot for each inch.

Roof plane draining to one gutter10-year, 5-minute burst100-year, 5-minute burst
600 square feetabout 20 gallons a minuteabout 37 gallons a minute
800 square feetabout 27 gallons a minuteabout 49 gallons a minute
1,000 square feetabout 34 gallons a minuteabout 62 gallons a minute
1,400 square feetabout 48 gallons a minuteabout 86 gallons a minute

Twenty gallons a minute is a 5-gallon bucket every 15 seconds, poured into one run of gutter, for as long as the burst lasts. The steps for measuring your own roof plane are near the end of this post.

What does a tile roof have to do with gutter size?

A tile roof gives the gutter a harder catch, and tile roofs are common on homes here. The water leaves from the edge of the tile, out in front of the fascia. The tile industry's installation manual tells roofers: "Use of rain gutter and eave closures should be considered in determining overhang." Barrel tile also gathers the water. Its shape makes channels that concentrate flow at the roof edge.

A 6-inch gutter is an inch wider across the top, so it is a bigger target under that edge. The machine maker's table has a row for 6-inch headed "Better for large, steep, or metal roofs." Its reason: "Fast-moving runoff stays inside the gutter instead of overshooting."

It is the same reason we recommend 6-inch for larger roof areas, steeper pitches, multi-level rooflines and tile roofs.

Do the downspouts change with the gutter?

Yes. A 5-inch gutter pairs with a 2x3-inch downspout and a 6-inch pairs with a 3x4. The 3x4 has twice the opening, 12 square inches against 6, and the maker notes it is "wide enough to accommodate most debris." That counts in a valley where the usual clog is dust and grit packed at the outlet after months without rain.

Size is not the whole answer. Undersized or poorly placed downspouts are behind the two most common gutter problems we see on service calls. A 6-inch gutter with too few downspouts can still spill. If your gutters overflow now, read why gutters overflow in heavy rain before you decide the size is the problem.

Does a bigger gutter need heavier metal?

It should have it. The machine maker says 6-inch gutters "are heavier and larger" than 5-inch, so a weak material may not hold up to storms. The same machine will form aluminum from .019 to .032 inch thick, so two 6-inch gutters are not always the same gutter. We form ours from .032-gauge aluminum, which is about 19 percent thicker than .027-gauge. Hanger spacing counts too. Hangers set more than 24 inches apart are prone to sagging in this climate, and a full 6-inch gutter is carrying more water than a full 5-inch.

Will a 6-inch gutter look too big on my house?

It depends on the fascia, the board the gutter hangs on. The maker's rule runs both ways. On a wide fascia board a 5-inch gutter "will look small," and on a small one a 6-inch "may stick out." Stand in the street and look at the fascia before you choose. Color does more than size to make a gutter disappear. We offer over 50 standard baked enamel colors and work with HOA color requirements daily. Check your HOA's color rules when you choose.

When is a 5-inch gutter the right call?

When the roof plane is small or the run is short. Seven of our 123 jobs this year were 5-inch. It fits:

  • A short run over an entry or a garage door.
  • A small roof plane. The maker's usual range for 5-inch is 600 to 800 square feet.
  • A small fascia board. The maker warns that a 6-inch gutter may stick out on one.
  • A house whose 5-inch gutters do not overflow. Size alone is no reason to replace a gutter that works.

An overflowing 5-inch does not always have to become a 6-inch, either. Adding a downspout to an existing gutter is one of the most common fixes for overflow in Las Vegas, and we do it regularly. Our downspouts page covers it.

Does a 6-inch gutter cost more?

Some, because it is more metal. The same maker points out that 5-inch gutters require less material, and the 6-inch takes the larger downspout. We are not going to print a price for each size here. Size is one part of a quote, and the roof decides the rest.

What we can give you is what this year's 123 jobs came to. About half of the homes we install on pay between $15 and $20 per foot of gutter, installed, with the downspouts and corners included. Based on City Seamless jobs installed or booked from January through October 2026. Not a quote. Your price depends on the length and on how many downspouts and corners the house needs. For what goes into an estimate, see how much seamless gutters cost and why gutter quotes vary.

Either size is formed on site, and every installation is backed by a 30-year material warranty and a 5-year workmanship guarantee.

How do I tell what I have and what I need?

Four checks, all from the ground:

  1. Measure a downspout. About 2 by 3 inches usually means a 5-inch gutter above it. About 3 by 4 usually means a 6-inch.
  2. Size the roof plane. Pace off the length of the gutter run. Then pace from that wall to the point under the ridge. Multiply the two. A 40-foot run with 20 feet to the ridge is 800 square feet.
  3. Find your row in the gallons table above. The maker's ranges in the first table are measured along the slope of the roof, so a paced number runs a little low against them.
  4. Count the downspouts on that run and note where they sit. A long run with one downspout at the far end deserves a second look.

Then watch it in a storm, from a window or the patio. If the run spills, note where. That one detail tells an installer more than the size does.

The right size depends on the specific roof: its square footage, its pitch, the number of valleys and where downspouts can go. We look at all four before we recommend one.

Frequently asked questions

What size gutters do most Las Vegas homes get?

This year, 6-inch. Of 123 new-gutter jobs City Seamless installed or booked from January through October 2026, 116 were 6-inch and 7 were 5-inch.

How much more water does a 6-inch gutter hold than a 5-inch?

About 40 percent more per foot. A maker of seamless gutter machines publishes the same figure.

What size downspout goes with a 6-inch gutter?

A 3x4-inch downspout. It has twice the opening of the 2x3-inch downspout that pairs with a 5-inch gutter.

Is a 5-inch gutter ever enough in Las Vegas?

Yes, on a small roof plane or a short run. A maker of gutter machines puts the usual range for a 5-inch gutter at roof planes of 600 to 800 square feet.

What does a 6-inch gutter cost?

We do not print a price by size. Across this year's 123 jobs, 116 of them 6-inch, about half of the homes we install on pay between $15 and $20 per foot of gutter, installed, with the downspouts and corners included. Not a quote; your price depends on the length and on how many downspouts and corners the house needs.

How hard does it rain in Las Vegas?

NOAA Atlas 14 puts the 5-minute burst that comes about once in 10 years in downtown Las Vegas at a rate of 3.30 inches per hour. The once-in-100-years burst is 5.95 inches per hour.

Related City Seamless resources

Want a number for your house? Request a free on-site estimate or Call or Text 725-502-3114.

About City Seamless Rain Gutter

Company: City Seamless Rain Gutter, family-owned in Las Vegas, with trade roots dating to 1976
Nevada Contractor Licenses: #0081882 and #0082656
Awards: Best of Las Vegas, Las Vegas Review-Journal, 2024 and 2025
Installations: 30,000+ homes installed
Standard Material: .032-gauge aluminum
Warranty: 30-year material warranty and a 5-year workmanship guarantee
Contact: Call or Text 725-502-3114 | cityseamless.com

Sources