As of September 2026, a full roof replacement in Nampa runs about $6,100 to $11,400 for a typical 1,900 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.
Nampa is really two roofing markets. The pre-1960 core around the Nampa Development District and west of downtown carries steep farmhouse rooflines, second shingle layers and original 3-tab well past its life, while the post-2000 subdivisions south of Greenhurst and toward Lake Lowell are reaching their first replacement together, street by street. The September 2026 installed rates in the table apply to both; the old core spends more of the range on tear-off and decking, the south side on wind-rated shingles and simple volume.
| 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 1,900 square foot home in Nampa carries about 23 squares of roof, which is where $6,100 to $11,400 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 Nampa home at $6,100 to $11,400 sits inside that span.
Downtown Nampa's Victorians, craftsmans and foursquares from the early 1900s were built steep, and steep means harness work, roof jacks and more surface for the same footprint. West Nampa and Garfield ranches from the 1950s to 1980s are the opposite: low, walkable and quick. The Karcher and north Nampa subdivisions sit in between with standard truss pitches.
Second layers are common in the old core, where a 1970s reroof went over the original shingles and has now failed itself. Idaho code allows a maximum of two shingle layers, so those roofs come off to the deck, and the tear-off weight of a double layer is a cost line that surprises buyers of Nampa's older homes.
Pre-war Nampa homes were decked in planks that often need re-sheeting with plywood or OSB before new shingles can be nailed. On the south side, the usual decking issue is different: OSB delaminated where irrigation-district humidity and north-slope moss held water against the roof near Lake Lowell, and where drainage backed up during the June 26, 2026 flooding.
Reroofing in Nampa is permitted through the City of Nampa Building Safety Division, not Canyon County, when the property sits inside city limits. Full tear-offs require a residential roofing permit, and Idaho code allows a maximum of two shingle layers before tear-off becomes mandatory. The permit fee follows the city's current fee schedule; ask for it as its own line on the bid. Source: City of Nampa Building Safety and Code, Building Permit Process.
Canyon County sees some of the highest sustained winds in the valley, and the Idaho Center and Karcher Interchange area sits in the spring storm track. Wind-rated shingles installed to the manufacturer's high-wind nailing pattern are the norm on Nampa bids, and a bid that leaves them out is not comparable to one that includes them.
The south Nampa and Lake Lowell subdivisions have flat lots and wide streets, the easiest staging there is. Downtown and west Nampa bring narrow lots, mature trees and detached garages that keep a dump trailer off the driveway, and the acreage properties toward Lake Lowell add outbuildings that are measured and quoted separately from the house.
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 Nampa 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.
No appointment. No salesperson. Just your address, and the roof is measured from aerial LiDAR and county imagery.
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