How Much Does Flat Roof Installation Cost in Seattle, WA?
Average flat roof installation costs in Seattle range from $15,072 to $20,392. Get a free, customized estimate below.
Flat Roof Installation Cost Breakdown — Seattle, WA
| Item | Unit | Qty | Unit Price | Total |
|---|---|---|---|---|
| EPDM / TPO Membrane | sq ft | 1200 | $7.15 | $8580.00 |
| Insulation Board | sq ft | 1200 | $3.64 | $4368.00 |
| Flashing & Edge Detail | linear ft | 80 | $15.60 | $1248.00 |
| Labor (full install) | hr | 32 | $110.50 | $3536.00 |
| Estimated Total | $17,732.00 | |||
* Prices are estimates based on Seattle market rates. Actual costs may vary based on project specifics.
Estimate
Ref ID: EST-2026-0A60
Date Issued
May 6, 2026
Client
Project Details
Site Address
Start Date
End Date
Scope of Work
Materials
| Material Specification | Units | Amount | Ext. Total | |
|---|---|---|---|---|
$ | $8,580 | |||
$ | $4,368 | |||
$ | $1,248 | |||
$ | $3,536 |
Labor
| Service Specification | Type | Hrs | Rate | Ext. Total | |
|---|---|---|---|---|---|
Craftsmanship Guarantee | $ | $600 |
Contractual Agreements & Conditions
Total
$18,332
Draft
Frequently Asked Questions — Flat Roof Installation in Seattle
How much does flat roof installation cost in Seattle, WA?
The average cost for flat roof installation in Seattle, WA ranges from $15,072 to $20,392, depending on project scope, materials, and labor rates. Seattle costs are above the national average due to higher labor and material costs in the region.
How do I get a free flat roof installation estimate in Seattle?
Use Brixor's free online estimate generator above. Enter your project details, customize line items for your specific needs, and download a professional PDF estimate instantly. No signup or credit card required.
What factors affect flat roof installation costs in Seattle?
Key factors include project size and complexity, material quality, labor rates in Seattle (WA), permit requirements, accessibility of the work area, and seasonal demand. Getting multiple estimates is recommended.