Basic
$1.07 – $3.29 per sq ft
1 in. XPS foam board, about R-5, fastened with cap fasteners, seams taped

Supply and install XPS (rigid foam) board insulation per sq ft of surface (typically 1 in. boards; thicker boards cost more), materials and labor.
XPS Insulation in Washington, District of Columbia typically costs $1.26 to $3.87 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 xps insulation.
National average: $1.20 – $3.70 per sq ft
$1.07 – $3.29 per sq ft
1 in. XPS foam board, about R-5, fastened with cap fasteners, seams taped
$1.26 – $3.87 per sq ft
1 in. XPS foam board, about R-5, adhesive-set and cap-fastened, seams taped, edges sealed with foam
$1.57 – $4.84 per sq ft
1 in. XPS foam board, about R-5, adhesive-set and cap-fastened, seams taped, gaps and penetrations foam-sealed, cut tight
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.57 – $1.74 | sq ft |
| Labor | labor | $0.44 – $1.35 | sq ft |
| Supplies & Other | supplies | $0.15 – $0.46 | sq ft |
| Equipment & Disposal | equipment | $0.11 – $0.32 | sq ft |
Teal XPS rigid foam boards laid across a roof terrace up to a brick parapet
Photo: Μάριος-Μητσόγλου · CC BY-SA 4.0 · Source
Find a pro to do thisConnect with local xps insulation contractors in Washington for personalized quotes based on your specific project.