Seattle Roofing Cost Calculator

For an average 2,500 sq ft residential home: composition shingles run $11,250 to $25,000 across our three Malarkey grades, metal roofing runs $25,000 to $40,000, and flat roofing systems run $10,000 to $27,500 (torch-down to PVC). The final price depends on roof size, shape, material grade, and whether any decking repair is needed. Cedar shake and composite roofing are priced on request.

For a 2,000 sq ft roof in the Seattle area: Malarkey Vista composition shingles cost $9,000 to $14,000, Malarkey Legacy costs $11,000 to $17,000, Malarkey Windsor costs $13,000 to $20,000, metal costs $20,000 to $32,000, TPO flat roofing costs $10,000 to $18,000, and PVC flat roofing costs $12,000 to $22,000. These ranges include tear-off, disposal, underlayment, flashing, and installation labor.

The seven main factors are: roof size (measured in squares, where 1 square = 100 sq ft), material choice, roof pitch (steeper = more expensive), number of stories, tear-off requirements, roof complexity (valleys, dormers, skylights), and condition of existing decking. In the Seattle area, moisture damage to decking is a common cost addition.

In the Seattle area, a metal roof costs roughly 2 to 2.5x more than composition shingles upfront. However, metal roofs last 40 to 70 years vs. 20 to 30 years for shingles. On a cost-per-year basis, metal roofing can be less expensive over the long run, with metal requiring zero maintenance vs. periodic moss treatment for shingles.

Yes. A complex roof with multiple valleys, dormers, hips, and skylights can add 20 to 40% to the total cost compared to a simple gable roof of the same square footage. Complex shapes require more flashing, more waste cut-offs, longer labor hours, and more skilled installation.

Flat roof replacement in the Seattle area costs $4 to $11 per sq ft installed. For a 1,000 sq ft flat section: torch down runs $4,000 to $8,000, TPO runs $5,000 to $9,000, and PVC runs $6,000 to $11,000. Torch down is the most affordable flat roof option.

For sloped roofs, architectural shingles (like Malarkey Vista) are the most affordable premium option at $4.50 to $7.00 per sq ft installed. For flat roofs, torch down modified bitumen is cheapest at $4 to $8 per sq ft. For long-term value, architectural shingles or standing seam metal provide the best cost-per-year of ownership.

Rotted decking, damaged rafters, or water-damaged sheathing typically add $2 to $5 per sq ft to the project. In the Seattle area, PNW moisture makes decking repair a common cost addition. The final figure depends on the extent of damage, which our crew can only confirm after tearing off the existing roof.