Composition shingles (also called asphalt shingles) are the most common roofing choice for homeowners due to their balance of affordability, durability, and style. These shingles typically last 15 to 30 years.

• Average Cost per square foot installed: $4.50 – $9.00
• Estimated total cost (1,500–2,000 sq ft home): $7,000 – $18,000
• Best for: Homeowners seeking a dependable, budget-friendly solution in a variety of colors and styles.

Polyvinyl Chloride (PVC) membrane is a durable single-ply roofing material ideal for flat or low-slope roofs. Its heat-welded seams deliver leakproof protection, making it popular for additions and modern homes in the Pacific Northwest.

• Average Cost per square foot installed: $7.00 – $14.00
• Estimated total cost (1,500–2,000 sq ft home): $12,000 – $28,000
• Best for: Homes with flat or low-pitch roof sections that require superior waterproofing and long-term durability.

Torch Down Roofing, a modified bitumen system, is also suited for flat or low-slope roofs. The application process creates a strong, multi-layered, waterproof surface. It’s valued for durability and resistance to Washington’s heavy rainfall.

• Average Cost per square foot installed: $6.00 – $12.00
• Estimated total cost (1,500–2,000 sq ft home): $10,000 – $22,000
• Best for: Flat roofs needing robust, watertight protection against pooling water and wet weather.