As of September 2026, a full roof replacement in Garden City runs about $5,300 to $9,900 for a typical 1,600 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.
Garden City packs the valley's most varied roof inventory into a few square miles along the Boise River: 1950s to 1970s ranches with flat or low-slope sections, long-established manufactured home communities, light-industrial flat roofs in the 36th Street arts district, and a wave of modern infill townhomes along the Greenbelt. The September 2026 installed rates in the table cover the pitched asphalt and metal work; low-slope membrane sections are quoted separately, and they come up here more than anywhere else in the valley.
| 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 1,600 square foot home in Garden City carries about 20 squares of roof, which is where $5,300 to $9,900 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 Garden City home at $5,300 to $9,900 sits inside that span.
Garden City's mid-century ranches often combine a shingled main roof with a flat or low-slope addition, carport or porch that shingles cannot waterproof. Those sections need TPO or modified bitumen, a different crew and a different price per square, so a Garden City bid is frequently two bids on one house. The estimator flags flat and near-flat planes from LiDAR pitch.
The 1950s to 1970s housing stock has had time for a second layer, and many of the smaller ranches carry one. Idaho code caps a roof at two layers, so those come off entirely. Manufactured homes are their own case: a metal roof-over is common and is quoted by the system rather than by tear-off.
Riverside humidity along the Greenbelt drives moss and algae on any shaded or north-facing surface year-round, and moss held against plywood for a decade leaves soft decking at the eaves. On the low-slope sections, ponding water is the usual cause of rotted sheathing, and it is found only after the old membrane comes off.
Garden City is its own municipality surrounded by Boise, and reroofs are permitted through the Garden City Development Services Department, not the City of Boise, a distinction that regularly trips up contractors quoting along the Chinden corridor. The permit fee follows the city's current fee schedule; ask for it as its own line on the bid. Source: Garden City Development Services, Building Services.
The arts district and Riverside Village hold converted industrial structures with complex roof assemblies: flat membrane over shop space, pitched metal over a later addition, and parapet details between them. Those are quoted on site by assembly, and the per-square table here is a starting point for the pitched portions only.
Greenbelt-corridor townhomes share walls and driveways, so staging and dump placement are coordinated with neighbors. The older ranch lots along Chinden are tight, with carports and outbuildings close to the house. Manufactured home communities have narrow internal streets that limit delivery truck size.
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 Garden City are measured from USGS aerial LiDAR flown September 2023 to August 2024, about 16 points per square meter, and Ada 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; Ada County Imagery 2025 (ACHD 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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