As of September 2026, a full roof replacement in Caldwell runs about $5,900 to $10,900 for a typical 1,800 square foot home, or $266 to $495 per square installed from 3-tab to designer shingles. Architectural shingles (GAF Timberline HDZ) are $380 to $410 per square. Measured from aerial LiDAR and county imagery, verified on site before any contract.
Caldwell pairs one of the valley's oldest housing cores with some of its fastest new growth. The streets around the College of Idaho and the restored Indian Creek district date to the early 1900s and bring steep pitches, layered shingles and plank decking; the subdivisions along Ustick, Moss Road and the Vallivue corridor are standard truss-framed architectural asphalt from the 2000s onward. The table below applies the September 2026 installed rates to each home size, and the sections after it show where an old-core bid and a northwest Caldwell bid part ways.
| Home size | Roof area | 3-tab (GAF Royal Sovereign) | Architectural (GAF Timberline HDZ) | Metal |
|---|---|---|---|---|
| Under 1,200 sq ft | 14 to 16 squares | $3,700 to $4,300 | $5,300 to $6,600 | $6,000 to $12,400 |
| 1,200 to 1,800 sq ft | 16 to 22 squares | $4,300 to $5,900 | $6,100 to $9,000 | $6,800 to $17,000 |
| 1,800 to 2,500 sq ft | 22 to 30 squares | $5,900 to $8,000 | $8,400 to $12,300 | $9,400 to $23,200 |
| 2,500 to 3,500 sq ft | 30 to 42 squares | $8,000 to $11,200 | $11,400 to $17,200 | $12,800 to $32,600 |
| Over 3,500 sq ft | 42 to 50 squares | $11,200 to $13,300 | $16,000 to $20,500 | $17,800 to $38,800 |
Roof area is the billable squares a home of that size usually needs, including pitch, overhangs and waste; one square is 100 square feet of roof. Totals are the September 2026 installed rate for each line multiplied by that range, rounded to the nearest $100. Metal spans exposed-fastener panels to standing seam.
This site prices from a partner price book (Bork Roofing) at an all-in rate per square, $380 to $410 installed for GAF Timberline HDZ, covering installation, tear-off of one existing layer, starter strip and drip edge, ridge cap, ice and water shield, standard flashing and pipe boots, disposal, steep-slope labor up to 8/12. Guides that quote a wider span average many bids with many markups.
The number is for the measured roof, not the floor area: a typical 1,800 square foot home in Caldwell carries about 22 squares of roof, which is where $5,900 to $10,900 comes from; the estimator measures yours.
Add-ons other guides fold into an average are itemized only when they apply: extra tear-off layers ($45 per square for each existing layer beyond the first); steep pitch ($35 per square on planes steeper than 8/12); decking (2 sheets included, then $95 per sheet); permit (the city's own fee where it is on file, else a $150 allowance).
Outside reference: This Old House, Cost of Roof Replacement in Idaho puts the Idaho average at $7,947 as of May 2026 ($6,117 to $20,703 statewide); a typical Caldwell home at $5,900 to $10,900 sits inside that span.
The College of Idaho blocks and downtown's craftsman and foursquare homes carry the steep original pitches of their era, which means harness work and noticeably more roof surface than the footprint suggests. East Caldwell's 1990s to 2010s subdivisions and the new construction northwest of town are moderate, walkable truss roofs where pitch barely moves the bid.
Mid-century homes near Indian Creek Plaza and the college frequently carry a second shingle layer laid over the first decades ago. Idaho's two-layer rule applies inside and outside city limits, so those roofs need a full tear-off, and the disposal weight of two layers is the part of a Caldwell old-core bid that a per-square rate alone does not show.
Plank decking under the early-1900s homes usually needs plywood or OSB re-sheeting at tear-off before shingles can be nailed. Around the orchards and farmland in 83606 and 83607, the common decking finding is different: agricultural dust and debris that clogged valleys for years and let water sit, softening the sheathing along the valley lines.
Caldwell reroofs inside city limits are permitted through the City of Caldwell Building Department; properties outside the city fall to Canyon County Development Services. Idaho's two-layer shingle rule applies either way: a second existing layer means mandatory tear-off. The permit fee follows the city's current fee schedule; ask for it as its own line on the bid. Source: City of Caldwell Building Safety Division.
Caldwell is the westernmost major city in the valley and often the first hit by spring storms tracking northeast from the Oregon border. Wind speeds along the Notus Road and Lake Lowell Avenue corridors call for wind-rated products, and after the June 26, 2026 storm, when a 53 mph gust was recorded at Caldwell Airport, the claims that followed were creased shingles and water intrusion rather than hail punctures.
The Lake Lowell acreage properties south of town add barns, shops and outbuildings that are measured and quoted separately, plus long gravel drives for material delivery. Downtown lots are narrow with alley access and mature trees. The northwest subdivisions along Ustick and Moss are flat, wide and simple to stage.
Pricing last updated September 2026. Per-square rates are the September 2026 Treasure Valley installed price list for the GAF asphalt lines and metal panel systems in the estimator; every figure on this page is calculated from that list, not typed in.
Roofs in Caldwell are measured from USGS aerial LiDAR flown September 2023 to August 2024, about 16 points per square meter, and Canyon County aerial imagery flown 2025 at 3 inch resolution; where LiDAR has not been flown yet, the estimate comes from aerial imagery alone and is labeled that way. A local roofing pro measures on site before any contract. Source: USGS 3D Elevation Program, ID_SouthernGaps_2_D23; Canyon County 2025 3-inch imagery (CC_2025_3in image service). How the measurement and pricing work and who runs RoofingQuotePro and who pays are on their own pages.
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