Basic
$3.56 – $8.01 per sq ft
Three-ply built-up roof with fiberglass ply sheets in hot asphalt, flood coat with gravel, new gravel stop
Install a new multi-ply built-up (tar and gravel) flat roof over an existing deck, per square foot, tear-off extra.
Built Up Roof in Washington, District of Columbia typically costs $4.19 to $9.42 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Prices in Washington are 5.0% higher than the national average for built up roof.
National average: $4 – $9 per sq ft
$3.56 – $8.01 per sq ft
Three-ply built-up roof with fiberglass ply sheets in hot asphalt, flood coat with gravel, new gravel stop
$4.19 – $9.42 per sq ft
Four-ply fiberglass felts in hot asphalt over a base sheet, flood coat with embedded gravel, new gravel stop and flashings
$5.23 – $12 per sq ft
Four plies plus base sheet over new cover board, flood coat and gravel, new edge metal, re-flashed curbs and drains
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $1.89 – $4.25 | sq ft |
| Labor | labor | $1.46 – $3.28 | sq ft |
| Supplies & Other | supplies | $0.50 – $1.13 | sq ft |
| Equipment & Disposal | equipment | $0.34 – $0.76 | sq ft |
Connect with local built up roof contractors in Washington for personalized quotes based on your specific project.