By The Roofing Brief Team | Last reviewed: October 2026
Copper gutters cost about $18 to $40 per linear foot installed in 2026, according to HomeAdvisor, and commonly last 50 to 100 years. Most residential systems use 16 oz or 20 oz cold-rolled copper sheet in a half-round or K-style profile, joined with lapped, riveted, and soldered seams. They must be hung with copper, brass, or bronze hardware, because contact with aluminum or galvanized steel corrodes the less noble metal.
This guide is the copper gutter material and installation reference: what the weights mean, what the copper alone costs today at a named retailer, the Copper Development Association (CDA) specs that decide whether a system leaks in year five or lasts a lifetime, and how fast the patina really forms. Most cost guides skip three facts that change a buying decision: 20 oz copper costs 44% to 50% more per foot at retail for 25% more metal, the retail price of copper alone for a 150-foot half-round system lands above the low end of published installed-cost ranges, and a gutter face weathers more slowly than a copper roof.
Key numbers at a glance
These are the figures most people want before pricing copper gutters: installed cost, sheet thickness, support spacing, expansion joint limits, lifespan, and patina time. Each row names its source. Prices vary by region, profile, and copper commodity prices, so treat every cost as a range rather than a quote.
| Figure | Value | Source |
|---|---|---|
| Installed cost per linear foot | $18 to $40 (sectional $18 to $30; seamless $30 to $40) | HomeAdvisor copper gutter cost guide, updated June 2026 |
| 16 oz copper thickness | 0.0216 in. (0.55 mm) | CDA guide specification, Copper Gutters and Downspouts (ASTM B370) |
| 20 oz copper thickness | 0.0270 in. (0.69 mm) | CDA guide specification, Copper Gutters and Downspouts |
| Bracket or strap spacing | Not more than 30 in. on center in most climates | CDA Copper in Architecture Design Handbook, 10.2 Hung Gutters |
| Expansion joints | Max 48 ft apart on straight runs; max 24 ft from a corner | CDA Design Handbook, 10.2G Expansion Joint Sections |
| Typical lifespan | 50 to 100 years with routine maintenance | HomeAdvisor (2026); Fixr (2025) |
| Time to green patina | 5 to 7 years (industrial, seacoast); 10 to 14 years (rural); may never form (arid) | CDA, Finishes: Natural Weathering |
What copper gutters are made of and how they are specified
Copper gutters are formed from cold-rolled copper sheet that meets ASTM B370, the standard the CDA guide specification cites for gutter and downspout copper. Sheet is sold by weight per square foot, so “16 oz copper” means 16 ounces of copper per square foot of sheet, not a gauge number. Joints are tinned, riveted, and soldered rather than caulked.
The CDA guide specification sets 16 oz copper as the default for hung gutters and downspouts and 20 oz for built-in gutters. Its hung-gutter detail drawings show gutters formed from 8-foot to 10-foot sheets of 20 oz copper, so architects often specify the heavier weight on custom work. Shop-made systems from a sheet metal contractor and roll-formed systems from suppliers such as Gutter Supply follow the same material rules.
16 oz vs 20 oz copper gutters: which weight do you need?
For most 5-inch and 6-inch residential gutters, 16 oz copper is the standard weight and the CDA default for hung gutters. Choose 20 oz for wider gutters, snow and ice loads, long runs, and built-in gutters. The heavier sheet is 25% thicker, but at Gutter Supply in October 2026 it cost 44% to 50% more per foot, so the upgrade should solve a real problem.
| Product (Gutter Supply, per foot, Oct 2026) | 16 oz | 20 oz | 20 oz premium |
|---|---|---|---|
| 5-inch copper K-style | $13.79 | $20.65 | +$6.86 (+50%) |
| 6-inch copper K-style | $19.20 | $27.65 | +$8.45 (+44%) |
| 6-inch copper half-round, reverse bead | $14.69 | $21.15 | +$6.46 (+44%) |
| Sheet thickness (CDA) | 0.0216 in. | 0.0270 in. | +25% metal |
Source: Gutter Supply product configurator prices checked October 7, 2026, before shipping and tax; CDA guide specification for thickness. Retail prices move with copper markets and may differ from contractor pricing.
Size limits push the decision too. Gutter Supply offers 7-inch copper K-style only in 20 oz and 8-inch in 20 oz or 24 oz. The CDA’s severe ice and snow detail (10.2B) adds 20 oz copper braces between brackets and calls for straps as well when the gutter is wider than 6 inches. If you live where gutters fill with ice, the heavier sheet and the extra support usually travel together.
Half-round vs K-style copper gutters
Half-round copper gutters suit historic and high-end homes, while K-style copper carries more water per inch of width and is easier to hang neatly. Fine Homebuilding notes that a 5-inch half-round gutter handles about half as much water as a 5-inch K-style, so half-round systems often need a larger size or more downspouts. Price per foot is similar in 6-inch stock.
| Factor | Half-round copper | K-style copper | Source |
|---|---|---|---|
| Water capacity at the same width | About half of K-style | Higher (flat bottom, deeper trough) | Fine Homebuilding, Issue 274 |
| Installed cost per foot | $19 to $40 | $18 to $30 | HomeAdvisor (2026) |
| Installed cost per foot (second source) | $27 to $40 | $26 to $37 | Fixr (2025) |
| Typical hanger | Exposed circle hanger on shank, or hidden bead hanger (reverse bead) | Hidden hanger or bracket | Gutter Supply product listings |
| Typical downspout | Plain round (3 in. or 4 in.) | Rectangular (2×3 or 3×4) | Gutter Supply product listings |
| Look | Traditional, visible hangers | Crown-molding profile | Visual |
Visible hangers on half-round gutters have to be evenly spaced and in a straight line, which This Old House flags as the reason half-round takes longer to install. For sizing by roof area, see our gutter size chart and downspout capacity table.
How much do copper gutters cost?
Copper gutters cost $18 to $40 per linear foot installed, with seamless runs at $30 to $40, per HomeAdvisor’s June 2026 guide. That puts 150 feet at roughly $2,700 to $6,000. Fixr reports a $25 to $40 range and a typical project near $4,500. Profile, copper weight, solder work, height, and the number of corners move a quote within those ranges.
| Item | Range | Source |
|---|---|---|
| Sectional copper gutters, installed | $18 to $30 per ft | HomeAdvisor (2026) |
| Seamless copper gutters, installed | $30 to $40 per ft | HomeAdvisor (2026) |
| Seamed copper gutters, installed | $25 to $34 per ft | Fixr (2025) |
| 150 linear feet, installed | $2,700 to $6,000 | HomeAdvisor (2026) |
| Downspouts | Budget 15% to 20% of gutter cost | HomeAdvisor (2026) |
| Copper downspout, 3-inch plain round, 16 oz | $174.33 per 10 ft (materials) | Gutter Supply, Oct 2026 |
| Copper downspout, 3×4 rectangular | $177.56 (16 oz) or $364.26 (20 oz) per 10 ft (materials) | Gutter Supply, Oct 2026 |
What the copper alone costs for a 150-foot system
At October 2026 retail prices, the main copper components for a 150-foot, 6-inch half-round system come to about $4,082 in 16 oz or $5,051 in 20 oz, before end caps, outlets, elbows, solder, shipping, or labor. That is roughly $27 to $34 per foot of gutter, which is above the low end of published installed ranges.
| Component (Gutter Supply, Oct 2026) | Quantity | 16 oz system | 20 oz system |
|---|---|---|---|
| 6-inch half-round reverse bead gutter | 150 ft | $2,203.50 | $3,172.50 |
| 3-inch plain round downspout, 16 oz | 80 ft (four 20-ft drops) | $1,394.64 | $1,394.64 |
| Copper reverse bead fascia hanger, $7.56 each | 64 (four runs at 30 in. on center) | $483.84 | $483.84 |
| Subtotal, major components | $4,081.98 | $5,050.98 | |
| Per foot of gutter | $27.21 | $33.67 |
This is a Roofing Brief take-off using single-unit retail prices, not a contractor bid. Contractors buying through distributors often pay less than single-unit retail, and a 5-inch K-style system in 16 oz copper costs less. Still, a quote near $18 per foot for 20 oz half-round copper is worth questioning: ask for the copper weight, the seam method, and the hanger spacing in writing.
Soldered, riveted, or seamless: how copper gutter joints work
The CDA standard for a non-moving copper gutter joint is a 1-inch lap that is riveted and soldered, with the edges tinned first. Soldered joints have no sealant to dry out, which is a large part of copper’s long service life. Seamless roll-forming reduces the number of joints but does not remove the need for expansion joints on long runs.
| Joint type | How it is made | Where it fits | Source |
|---|---|---|---|
| Lapped, riveted, soldered seam | 1-in. lap, tinned edges, copper or brass-mandrel rivets, soldered | Standard joint between gutter sections | CDA guide specification |
| Soldered one-piece corner | Corner fabricated from one piece with returns of at least 18 in., soldered | Inside and outside miters | CDA guide specification |
| Butt or lap expansion joint | Flanged gutter ends riveted and soldered in, covered by a cap that does not restrict movement | Every 48 ft max; within 24 ft of corners | CDA Design Handbook 10.2G |
| Slip-joint connector | Mechanical connector, no solder | Some half-round systems; less common on copper | Fine Homebuilding, Issue 274 |
Solder and flux are specified too. The CDA guide specification calls for ASTM B32 solder in 50-50 tin-lead or a lead-free alternative of similar or greater strength, pop rivets 1/8 to 3/16 inch in diameter with solid brass mandrels, and washing joints with fresh water and baking soda afterward to neutralize the flux.
Expansion joints: how much a copper gutter moves
Copper grows and shrinks about 0.0000098 inch per inch per degree Fahrenheit, the coefficient the CDA uses in its gutter expansion example. Over a 150-degree design swing (0 F to 100 F air plus 50 F of solar superheat), a 48-foot copper run moves about 7/8 inch. Without expansion joints, that movement concentrates at soldered seams and corners, which is where long copper runs crack.
| Run length between fixed points | Total movement over a 150 F swing | Notes |
|---|---|---|
| 10 ft | 0.18 in. (about 3/16 in.) | One standard sheet length |
| 24 ft | 0.42 in. (about 7/16 in.) | CDA max distance from a corner to the first joint |
| 36 ft | 0.64 in. (about 5/8 in.) | Longer section in the CDA worked example |
| 48 ft | 0.85 in. (about 7/8 in.) | CDA max spacing on a straight run |
| 60 ft, no joint | 1.06 in. | Exceeds CDA limits; needs a joint |
Source: Roofing Brief calculation using the CDA formula (change in length = length x 0.0000098 x temperature change) and the CDA design range from Table 10.2A. In the CDA’s own example, a 36-foot section installed at 65 F contracts about 1/4 inch and expands about 3/8 inch.
Which metals can touch copper gutters?
Copper gutters should touch only copper, brass, bronze, or a compatible non-corrosive metal such as stainless steel. The New Zealand building research body BRANZ notes that its Acceptable Solution E2/AS1 lists copper and brass as incompatible with aluminum, galvanized steel, and zinc, and that aluminum may corrode when water that has passed over copper flows onto it.
| Material in contact with copper | Compatible? | Source |
|---|---|---|
| Copper, brass, bronze hangers, straps, braces | Yes | CDA Design Handbook 10.2 (brackets of copper, brass, or bronze) |
| Stainless steel screws or hangers | Generally yes; close to copper in the galvanic series | BRANZ Facts: Metal Corrosion #2, Table 1 |
| Aluminum gutters, guards, or flashing | No | BRANZ, citing E2/AS1 Table 21 |
| Galvanized steel or zinc | No | BRANZ, citing E2/AS1 Table 21 |
| Mild (plain) steel | No, caution required | BRANZ Facts: Metal Corrosion #2 |
| Unavoidable dissimilar contact | Separate with a bituminous coating or other permanent barrier | CDA guide specification, Separations |
The practical rules: never hang copper gutters on leftover aluminum hangers, never let copper discharge onto an aluminum roof or galvanized awning, and do not put aluminum guards on copper gutters. For the material trade-off itself, see our copper vs aluminum gutters comparison, and for guards that match, see copper gutter guards.
Copper gutter patina: what color, and how fast
New copper gutters move from salmon pink through russet and chocolate brown before reaching blue-green or gray-green, per the CDA. The green patina generally forms in 5 to 7 years in industrial and seacoast air and may take 10 to 14 years in rural air. In arid climates it may never form. The deciding variable is how long moisture sits on the surface.
| Environment | Time to dominant green patina | Source |
|---|---|---|
| Industrial or seacoast | About 5 to 7 years | CDA, Natural Weathering |
| Rural (low sulfur dioxide) | About 10 to 14 years | CDA, Natural Weathering |
| Arid | May never form | CDA, Natural Weathering |
| First weeks | Iridescent pinks, oranges, and reds, then uniform russet brown | CDA, Natural Weathering |
One detail most patina timelines miss: the CDA says horizontal surfaces patinate faster than sloped ones, and sloped faster than vertical. A gutter face is close to vertical, so it often stays brown for years after a copper roof above it has turned green. Dark purple or black spots soon after install are usually mill anti-stain oil, which the CDA says rain washes off.
How copper gutters are installed
Copper gutter installation follows the same layout as any hung gutter, with three differences: every joint is soldered, all hardware must be copper-compatible, and long runs need expansion joints. The steps below follow the CDA Copper in Architecture Design Handbook and guide specification, with slope and downspout bracket spacing from This Old House.
- Plan downspouts and size the gutter. The CDA sizing basis assumes each square inch of downspout drains 1,200 square feet of roof at a rainfall intensity of 1 inch per hour, and capacity falls as intensity rises. Use local rainfall intensity, not a national average.
- Set the slope. This Old House recommends about 1/4 inch of fall for every 10 feet of run toward the outlet. Snap a chalk line on the fascia before hanging anything.
- Install the apron or edge strip. The CDA calls for a continuous copper apron extending at least 4 inches onto the roof sheathing, locked into the folded back edge of the gutter to form a drip.
- Hang the supports. Space copper, brass, or bronze brackets or straps no more than 30 inches on center. Straps should extend at least 6 inches onto the roof and fasten with two brass screws, per CDA details.
- Keep the front edge low. The CDA guide specification calls for the front edge to sit at least 1 inch lower than the back edge, so overflow spills outward instead of behind the gutter.
- Join sections. Tin the edges, lap 1 inch, rivet, and solder with ASTM B32 solder. Fabricate corners from one piece with returns of at least 18 inches and solder them.
- Add expansion joints. Place them no more than 48 feet apart and no more than 24 feet from any corner. Leave the cover cap free to slide.
- Neutralize the flux. Wash each soldered joint with fresh water and baking soda, per the CDA specification, so flux residue does not stain or etch the copper.
- Hang the downspouts. Attach brackets near the top and bottom elbows and every 6 to 8 feet along the run, per This Old House, using copper or brass straps. Where a scupper or a decorative top feeds the pipe, see our guide to copper conductor heads.
- Check every contact point. Look for aluminum or galvanized items touching the system, such as old hangers, satellite mounts, or flashing, and isolate or replace them.
Soldering copper well is a trade skill, which is why labor is a larger share of copper bids than of aluminum bids. Ask a contractor whether the crew solders every seam or relies on sealant, and how many copper systems it has installed.
Copper gutter theft and how to reduce the risk
Copper gutters and downspouts have scrap value, and thieves have targeted them on homes and churches. A 2012 CBS Baltimore report described two men stripping gutters and downspouts from a Maryland house in about four and a half minutes, and noted that Maryland authorities had arrested more than 400 people over metal thefts in the prior two years.
- Light the downspout areas and point a camera at them; low downspout sections are the easiest targets.
- Fasten lower downspout straps with tamper-resistant brass or stainless screws, not aluminum or plated steel.
- Photograph the system and keep the invoice showing copper weight and length for an insurance claim.
- Ask your insurer how a theft claim for copper gutters would be valued; coverage and deductibles vary by policy.
Which copper gutter setup should you pick?
Match the copper weight, profile, and joint method to the house, the climate, and the water load. Use this table as a starting point, then confirm sizing against local rainfall intensity and the roof area each downspout serves. A sheet metal contractor can adjust the weight and support details to local snow loads.
| Your situation | Recommended setup | Why |
|---|---|---|
| Historic or traditional house, moderate rainfall | 6-inch half-round, 16 oz, round downspouts | Period look; 6-inch offsets half-round’s lower capacity |
| Heavy snow and ice | 20 oz, one-piece gutter and apron, brackets plus braces | CDA detail 10.2B for severe ice and snow |
| Large roof areas or heavy downpours | 6-inch K-style or larger, 3×4 rectangular downspouts | K-style carries more water per inch of width |
| Gutter wider than 6 inches | 20 oz, brackets and straps | CDA calls for straps above 6 in.; 7 in. and 8 in. sold in 20 oz+ |
| Long straight runs over 48 ft | Expansion joints at 48 ft max, 24 ft from corners | CDA expansion limits |
| Copper look on a tight budget | Copper-colored aluminum (for example, Gutter Supply Copper Penny .027 aluminum at $3.60 to $4.52 per foot) | Looks like new copper but will not patina; still keep it away from real copper |
| Existing aluminum gutters, adding copper accents | Keep metals fully separate or choose one metal | Copper and aluminum are incompatible in contact or runoff |
To see how copper stacks up against aluminum, steel, zinc, and vinyl on climate and price, read our gutter materials comparison.
Copper gutters: frequently asked questions
Is 16 oz or 20 oz copper better for gutters?
For a typical 5-inch or 6-inch hung residential gutter, 16 oz copper (0.0216 in. thick) is the Copper Development Association’s default specification. Step up to 20 oz (0.0270 in.) for gutters wider than 6 inches, heavy snow and ice country, long runs, or built-in gutters. At Gutter Supply in October 2026, 20 oz cost about 44% to 50% more per foot than 16 oz.
How long do copper gutters last?
Cost guides from HomeAdvisor and Fixr put copper gutter lifespan at roughly 50 to 100 years with routine cleaning and inspection. Actual life depends on the copper weight, solder joint quality, support spacing, and whether the system touches aluminum, galvanized steel, or zinc, which can corrode the less noble metal at the contact point. Copper itself does not rust.
How long does it take copper gutters to turn green?
The Copper Development Association says a natural patina generally forms in five to seven years in industrial and seacoast air and may take 10 to 14 years in rural air. In arid climates it may never form. Vertical surfaces patinate more slowly than sloped ones, so the near-vertical face of a gutter often stays brown longer than a nearby copper roof.
Can copper gutters be seamless?
Yes, in some profiles. Gutter Supply sells copper K-style gutter in 5-inch and 6-inch sizes by the foot in custom lengths and describes its 6-inch half-round reverse bead copper gutter as roll-formed on site. Longer runs still need expansion joints: the Copper Development Association calls for joints no more than 48 feet apart and no more than 24 feet from a corner.
What hangers and fasteners should copper gutters use?
Use copper, brass, or bronze hangers, straps, and brackets, which is what the Copper Development Association details show, plus copper or brass screws and rivets. Stainless steel is a common alternative because it sits close to copper in the galvanic series. Avoid aluminum, galvanized steel, plain steel, and zinc in direct contact, which BRANZ lists as incompatible with copper.
Do copper gutters get stolen?
They can be. Copper has scrap value, and news reports have documented thieves stripping copper gutters and downspouts from homes and churches, including a 2012 CBS Baltimore report of two men removing them from a Maryland house in about four and a half minutes. Lighting, cameras, tamper-resistant fasteners on low downspout sections, and a check of your homeowners policy can reduce the exposure.
Can you keep copper gutters shiny?
Only with ongoing work. The Copper Development Association’s specification notes that clear lacquer can keep copper bright and paraffin oil can hold brown tones, but it does not recommend clear coatings to retard weathering because of the maintenance they require. Coatings wear unevenly outdoors, so most owners let the copper weather naturally.