COST GUIDE · 2026
Half-Round Gutter Cost in Boise & the Treasure Valley
Half-round gutters in the Treasure Valley run roughly $14–$33 per linear foot in aluminum — about 1.2 to 1.5 times standard K-style — with copper priced separately and far higher; most whole-home aluminum systems land between about $2,800 and $7,300.
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THE HONEST RANGE
What half-round gutters actually costs here
Half-round is a premium gutter profile, and it prices like one: roughly $14 to $33 per linear foot installed in aluminum, which works out to about 1.2 to 1.5 times a standard K-style seamless system. Copper half-round is a separate conversation — it's quote-only and runs several times the aluminum rate. The extra cost buys two things. First, the tubular half-round shape is the architecturally correct profile for the homes it belongs on — pre-1950 bungalows, craftsman, colonial revival, and Tudor styles — where angular K-style reads as a cost-cutting afterthought. Second, the profile is fabricated and hung differently: it uses round corrugated downspouts and profile-specific hangers rather than standard K-style hardware, and that specialty material and slower labor is where the price premium comes from.
In the Treasure Valley, the homes that call for half-round cluster in a few places: Boise's North End, where the pre-1950 bungalows and craftsman homes were designed around curved rooflines and exposed rafter tails; the older cores of Caldwell and Nampa; and newer custom craftsman builds in Eagle and the Foothills that reference those eras. On those homes, half-round isn't a functional upgrade so much as an architectural match — but there's a real drainage side benefit too. The smooth tubular interior sheds pine needles, cottonwood flock, and seed pods more cleanly than the sharp inside corner of a K-style trough, where that fine local debris tends to pack and mat.
The figures below are installed pricing across Ada and Canyon counties for aluminum half-round, expressed as ranges because profile size (4-, 5-, or 6-inch), gauge, downspout configuration, and story access all move the number. Copper is called out separately throughout because it prices on a different scale and is always quoted per project. Use the calculator below for a K-style baseline range, then contact us for a profile-specific half-round quote — the on-site visit is where a fixed number gets set.
PRICING TIERS
Half-Round Gutter Cost by project size
Small / single-story (aluminum)
$1,900 – $4,600
≈100–140 linear feet of aluminum half-round with round corrugated downspouts. Smaller historic bungalows and cottages with modest roof area and ground-level access. Copper at this footage is quote-only and materially higher.
Typical historic / craftsman home (aluminum)
$2,800 – $7,300
≈160–220 linear feet of 5-inch aluminum half-round with round downspouts and profile-specific hangers. The bracket most North End, Caldwell, and older Nampa homes fall into for a full aluminum half-round system.
Large / custom / copper-eligible
$4,600 – $11,900+ (aluminum); copper quote-only
≈260–360+ linear feet, 6-inch profile, .032 gauge or copper, second-story access, and long custom eave runs. Large Foothills and Eagle custom homes; copper half-round on these homes is priced per project and runs several times aluminum.
COST BY COMPONENT
What each line item runs
| Component | Range | Notes |
|---|---|---|
| 5-inch aluminum half-round | $14 – $26 / ft | The standard half-round size for most Treasure Valley homes with this profile. Available in the full baked-on enamel palette to match fascia and trim. |
| 6-inch aluminum half-round | $18 – $33 / ft | Larger custom homes, steep pitches, and long spans. The bigger trough handles more water and reads correctly on homes with generous eave overhangs. |
| Copper half-round (16oz / 20oz) | Quote-only (several × aluminum) | Historic restoration and high-end custom. Soldered joints, develops a natural patina, and prices on a different scale — always quoted per project, never per a fixed foot rate. |
| Round corrugated downspouts | $60 – $140 each | The historically correct match for half-round; round downspouts and elbows cost more than square K-style drops. Copper round downspouts price separately and higher. |
| Half-round hangers / fascia brackets | $8 – $18 per hanger | Profile-specific fascia brackets or spike-and-ferrule set at tighter spacing than K-style, because the round shape doesn't distribute load the same way. K-style hidden hangers do not seat correctly and are not used. |
| Soldered joints (copper systems) | Labor, quote-only | Copper half-round is soldered at every corner and outlet, not sealed with caulk. The skilled soldering labor is part of why copper prices well above aluminum. |
COST RANGE
How much do half-round gutters cost in the Treasure Valley?
Half-Round Gutters in the Treasure Valley typically runs $12–$33 per linear foot — about $19 on average before downspouts. The biggest variables are total footage, story count and access, gutter profile, and existing condition.
PER LINEAR FOOT · Half-Round
Typical $19 per linear foot
Downspouts are an add-on at $40–$90 each (typical $65), sized to the roof area they drain.
These are Treasure Valley ranges only — the on-site visit gives the real number. Actual cost depends on roof access, story count, existing condition, and the system selected.
TREASURE VALLEY FACTORS
What moves the price in Boise
The same service can price differently across two Treasure Valley homes. These are the local drivers that decide where a specific home lands in the range.
Historic North End and downtown Caldwell architecture
The pre-1950 bungalows and craftsman homes in Boise's North End, plus the older cores of Caldwell and Nampa, were designed around half-round. On those homes the profile is an architectural match, not an option — and where a historic-district look is being preserved, the correct profile and downspout are what make the restoration read right from the street.
Aluminum vs. copper — the biggest price driver
Material choice moves the number more than anything else on a half-round job. Aluminum half-round sits in the $14–$33 per-foot range; copper is quote-only and runs several times higher because of the metal cost and the soldered-joint labor. Deciding aluminum vs. copper up front is the single most important budgeting call.
Round downspouts cost more than square
Half-round pairs with round corrugated downspouts to stay period-correct — putting square K-style drops on a half-round gutter requires an adapter and looks wrong on a historic home. Round downspouts, elbows, and brackets carry a higher material cost than the standard square hardware, and that difference is baked into the per-foot premium.
Profile-specific hangers and slower labor
Half-round uses fascia brackets or spike-and-ferrule set at tighter spacing than K-style hidden hangers, and copper adds soldering. The hardware costs more and the install is slower and more skilled — the labor side of why half-round runs above K-style even in aluminum.
Foothills debris and freeze-thaw performance
The smooth tubular interior sheds the valley's pine needles and June cottonwood flock better than K-style's sharp inside corner, which matters on heavily-treed North End and Foothills lots. On copper systems, soldered joints — not caulk — hold through Boise's freeze-thaw cycles far better than a sealed seam, part of what justifies copper's cost on a home meant to last generations.
IS IT WORTH IT?
The return on the spend
Half-round is the rare gutter decision where curb appeal is the primary return. On a 1920s North End bungalow, replacing angular K-style with the correct half-round profile visibly restores the home's original design intent — the difference is obvious from the street and reads to buyers and appraisers as a home that's been maintained in period rather than patched with whatever was cheapest. For a home whose value leans on its historic character, that architectural correctness is worth the premium over K-style.
There's a functional return underneath the aesthetic one. The smooth half-round interior sheds fine local debris — pine needles and cottonwood flock — more cleanly than K-style's packed inside corner, which means fewer clogs and less cleaning over the system's life. And in copper, half-round becomes a multi-generational system: soldered joints and a naturally protective patina routinely outlast the homeowner who installed them, spreading a higher up-front cost across decades of service where a cheaper system would have been replaced two or three times.
COMMON ADD-ONS
- Round-profile gutter guards (half-round rated)$10 – $22 / ft
- Copper round downspouts (in place of aluminum)Quote-only
- Underground drainage tie-in / splash management$40 – $90+ per drop
Get a real half-round gutters number for your home.
The ranges above are honest, but every roofline is different. Free on-site estimate — call (208) 247-2660 or request a quote online.
Frequently asked questions
How much do half-round gutters cost per foot in Boise?
Why do half-round gutters cost more than K-style?
Is aluminum half-round available, or is it only copper?
Which Boise-area homes should have half-round gutters?
How much more does copper half-round cost than aluminum?
Does half-round really drain better than K-style?
HOW WE PRICED THIS
- Boise Gutter Guards on-site pricing (calculator-data). Half-round pricing is derived from our K-style seamless per-foot baseline with the half-round profile multiplier (roughly 1.2–1.5×) shown in the cost calculator; copper is quoted per project.
- Angi / HomeAdvisor national gutter cost data. Independent aggregators publish comparable national ranges showing half-round and copper priced above standard K-style aluminum; local Treasure Valley figures track that relationship.
- Half-round profile & copper gutter manufacturer references. Manufacturer specs for aluminum and copper half-round document gauge, profile sizes, round downspout matches, and soldered-joint requirements, supporting the material-and-profile pricing used here.
Free half-round gutters estimate in Boise & the Treasure Valley.
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