The formula
For each line item we multiply a quantity by a national unit cost, then apply a quality-grade factor. A regional labor multiplier is applied to the labor portion only; materials are priced nationally. We show the itemized result as a ±25% range.
National unit costs
| Line item | National unit cost | Source |
|---|---|---|
| Gutter material | $5.00 / sq ft | homeguide.com (source for Gutter material) |
| Installation labor | $5.00 / sq ft | angi.com (source for Installation labor) |
| Downspouts | $60.00 / sq ft | homeguide.com (source for Downspouts) |
| Two-story height surcharge | $2.00 / sq ft | thisoldhouse.com (source for Two-story height surcharge) |
| Gutter guards | $7.00 / sq ft | thisoldhouse.com (source for Gutter guards) |
| Old gutter removal | $1.50 / sq ft | homeguide.com (source for Old gutter removal) |
Regional labor multipliers
Each state's labor multiplier is its mean carpenter wage relative to the national mean, from the U.S. Bureau of Labor Statistics Occupational Employment & Wage Statistics (Carpenters, SOC 47-2031) - used as a disclosed proxy for the local install-trade wage, since gutter installation has no dedicated occupation code. Multipliers are bounded to a sane range and applied to the labor share of each line item, so materials stay nationally priced while labor tracks local wages.
Data vintage and limitations
Compiled June 2026 from public cost aggregators and government wage data. These are derived estimates, not live contractor quotes. Local prices vary with project complexity, access, and material availability; always confirm with a licensed contractor before budgeting.
Sources
- https://homeguide.com/costs/seamless-gutters-cost
- https://taxfoundation.org/data/all/state/sales-tax-rates-midyear-2025/
- https://www.angi.com/articles/how-much-does-gutter-replacement-cost.htm
- https://www.bls.gov/ooh/construction-and-extraction/carpenters.htm
- https://www.thisoldhouse.com/gutters/gutter-installation-cost