Gutter caps refer to two different products that share one name: the small end caps that seal the ends of a gutter trough, and reverse-curve gutter guards sold under brand names like Gutter Cap. Knowing which one you mean changes the price by a factor of hundreds. An end cap is a few dollars; a whole-house gutter guard system runs into the thousands. This guide covers both, with 2026 pricing and install steps for each.
What are gutter caps? One name, two products
Gutter caps describe two unrelated parts. A gutter end cap is a stamped metal or vinyl piece that closes off the open end of a gutter run so water flows to the downspout instead of spilling out the side. A gutter guard, often marketed as Gutter Cap, is a cover installed over the full gutter length to keep out leaves. Both get searched as “gutter caps,” so confirm which you need before you buy.
The two parts do opposite jobs. End caps seal a single opening at each corner of a gutter section. Guards cap the top surface of the entire trough. A typical home needs a handful of end caps and, if the owner chooses, one continuous run of guards.
Gutter end caps: types, sizes, and materials
Gutter end caps come in left and right versions, in K-style or half-round profiles, and in 5-inch or 6-inch widths to match the gutter. According to Ned Stevens, a national gutter service, they seal the trough end, block debris and pests, reduce corrosion at the cut edge, and improve curb appeal. Common materials are vinyl, aluminum, steel, and copper. Aluminum is the default on most residential seamless systems.
You order end caps as left or right because the cap wraps around the front bead of the gutter, which faces a fixed direction. A 5-inch K-style gutter, the most common residential size in the United States, needs 5-inch K-style caps. Half-round gutters use round caps that are not interchangeable with K-style.
| End cap attribute | Options | Notes |
|---|---|---|
| Profile | K-style, half-round | Must match the gutter profile exactly |
| Size | 5-inch, 6-inch (K-style); 5-inch, 6-inch (half-round) | 5-inch K-style is the most common residential size |
| Orientation | Left, right, sold as pairs | Ordered by which end of the run it seals |
| Material | Aluminum, vinyl, steel, copper | Aluminum most common; copper for premium builds |
| Attachment | Screws or rivets plus sealant | Sealant on inside edge is what stops leaks |
Retail aluminum end caps from brands such as Amerimax are sold individually at home centers like Lowe’s in left and right pieces, and in matching gutter colors such as white and brown. Priced per piece, they are among the cheapest parts of a gutter system, typically a low single-digit dollar cost each, though exact pricing varies by retailer, color, and material.
How do you install a gutter end cap?
Installing a gutter end cap takes a few minutes per cap and relies on sealant, not just fasteners, to stay watertight. The cap slides over the cut end of the gutter, gets fastened with rivets or screws, and is sealed on the inside edge with a weather-resistant gutter sealant. Per Ned Stevens, the sealant must dry fully before the gutter sees rain or snow.
- Confirm the profile, size, and orientation (left or right) match the gutter, then dry-fit the cap over the trough end.
- Clean and dry the cut edge of the gutter so sealant bonds to bare metal, not dirt.
- Apply a bead of weather-resistant sealant, such as a gutter or roofing sealant, to the inside seam where the cap meets the trough.
- Press the cap onto the end and crimp or push it snug against the front and back walls.
- Set two or three pop rivets or short screws through the cap into the gutter to hold it mechanically.
- Tool a second bead of sealant over the inside seam to seal any gaps, then let it cure before the next rain.
A crimping tool helps seat the cap tight on the front bead. For the full kit, see our guide to the gutter crimping tool.
How do you fix a leaking gutter end cap?
A leaking end cap almost always fails at the inside seam, not the metal itself. The fix is to strip the old sealant, clean the joint, and reseal, rather than replacing the whole gutter. If the cap is corroded or bent, swap in a new matching cap. Leaks that keep returning after resealing can signal a corroded trough end that needs a section replaced.
- Scrape out the old, cracked sealant from inside the cap seam with a putty knife.
- Clean the joint with a rag and let it dry completely so new sealant will bond.
- Apply fresh weather-resistant sealant along the full inside seam, front to back.
- If the cap is loose, add a rivet or screw before resealing so it does not flex.
- Let the sealant cure per the label, often 24 to 48 hours, before exposing it to water.
Recurring leaks at the same end often trace back to standing water from poor slope or a blocked outlet. Check where the water actually exits with our guide to downspout drainage before you keep resealing the same cap.
Gutter Cap and other gutter guards: what they cost in 2026
Gutter Cap is a brand of reverse-curve, surface-tension gutter guard, a cover that caps the top of the gutter and uses water adhesion to pull rain in while leaves fall off the edge. This is a whole-gutter product, priced per linear foot, not a per-piece part. It competes with mesh, micro-mesh, screen, brush, and foam guards. Because “Gutter Cap” and “gutter caps” read alike, buyers often confuse this system with a simple end cap.
Gutter guard pricing in 2026 depends heavily on guard type and whether you install it yourself or hire a brand. Per This Old House 2026 figures, professionally installed systems average roughly $40 per linear foot, or about $6,414 to $9,468 for 200 linear feet. HomeGuide’s 2026 data puts material-only ranges lower: brush and foam around $1 to $8 per foot, screen $3 to $12, and micro-mesh $6 to $18.
| Guard type or brand | 2026 cost per linear foot | Source basis |
|---|---|---|
| Brush-style (DIY materials) | ~$18.94 | This Old House 2026 |
| Foam insert (DIY materials) | ~$21.58 | This Old House 2026 |
| Screen (DIY materials) | ~$38.12 | This Old House 2026 |
| Micro-mesh (DIY materials) | ~$40.50 | This Old House 2026 |
| Reverse-curve / surface tension (DIY materials) | ~$41.22 | This Old House 2026 |
| LeafGuard (professionally installed) | ~$39.59 | This Old House 2026 |
| LeafFilter (professionally installed) | ~$41.72 | This Old House 2026 |
| All American Gutter Protection (installed) | ~$47.02 | This Old House 2026 |
These figures are averages that vary by region, roof height, gutter condition, and whether old gutters need replacing first. Reverse-curve products like Gutter Cap sit at the higher end of the DIY range and often require professional fitting to the roof edge, which is why installed quotes climb well above material cost.
Gutter end caps vs gutter guards: which “gutter cap” do you need?
You need a gutter end cap if water is spilling out the open end of a gutter section or a corner is unsealed. You need a gutter guard, sometimes called a gutter cap, if leaves and debris keep clogging the trough. They solve different problems and cost worlds apart. One is a repair part; the other is a whole-system upgrade.
| Factor | Gutter end cap | Gutter guard (Gutter Cap style) |
|---|---|---|
| Purpose | Seals the open end of a gutter run | Keeps leaves and debris out of the trough |
| Coverage | One opening at each end/corner | The full length of every gutter |
| Sold by | The piece (left/right) | The linear foot |
| Typical cost | Low single-digit dollars each | Roughly $19 to $47+ per linear foot in 2026 |
| Install | Rivet or screw plus sealant, DIY-friendly | Often professional, especially reverse-curve |
Both parts sit at the edge of a larger system. If you are pricing a full replacement rather than a repair, start with real gutter numbers in our breakdown of aluminum gutters cost and how seamless gutter systems are priced and installed. For the corner joints between end caps, see our guide to the gutter miter.
Frequently asked questions about gutter caps
What is a gutter cap?
A gutter cap is one of two things. It can mean a gutter end cap, a small piece that seals the open end of a gutter trough so water runs to the downspout. It can also mean a gutter guard sold under the brand Gutter Cap, a cover installed over the full gutter to block leaves. Confirm which product a listing means before buying, since prices differ enormously.
Do gutter end caps come in left and right?
Yes. Gutter end caps are sold as left and right pieces because the cap wraps around the front bead of the gutter, which faces one direction. The left cap seals the left end of a run and the right cap seals the right. Many suppliers also sell them in matched pairs. Always match the cap to the gutter profile, either K-style or half-round, and to the width, usually 5-inch or 6-inch.
How do you stop a gutter end cap from leaking?
Strip the old sealant from inside the cap seam, clean and dry the joint, then apply fresh weather-resistant gutter sealant along the full inside edge. Add a rivet or screw if the cap is loose so it cannot flex. Let the sealant cure fully, often 24 to 48 hours, before rain. If leaks return, the trough end may be corroded and need a section replaced.
How much do gutter caps cost?
Gutter end caps are among the cheapest gutter parts, typically a low single-digit dollar amount per piece at home centers, though exact pricing varies by retailer and material. Gutter guards sold as gutter caps cost far more, roughly $19 to $47 or more per linear foot in 2026 depending on type and whether a brand installs them, per This Old House 2026 data. Copper end caps cost more than aluminum or vinyl.
Are Gutter Cap guards the same as gutter end caps?
No. Gutter Cap is a brand of reverse-curve gutter guard that covers the top of the gutter to keep leaves out, priced per linear foot as a whole-house system. A gutter end cap is a separate small part that seals the open end of a gutter run and is sold per piece. They share a similar name but solve different problems at very different price points.
What size gutter end cap do I need?
Match the end cap to your gutter profile and width. Most United States homes use 5-inch K-style gutters, so 5-inch K-style caps fit. Larger homes and steep roofs often use 6-inch K-style. Half-round gutters need round caps in the matching diameter. Measure the gutter opening or check the profile shape, then order the same size and style in left and right as needed.
Reviewed by The Roofing Brief Team. Last reviewed August 2026.