Is $16,800 to replace asphalt shingles on a 700 sq ft single-story roof a fair price?

Quote is for replacing the roof, based on an average of two estimates received. - Scope: Tear off existing roof and install replacement shingles - Roof Size: 34 squares - Shingle Type: Class 3 shingles - House Type: One level, low pitch (approx 6.5)

This estimate is for the replacement of the existing asphalt shingle roof, including the following items: - Tear off: Existing shingles (1 layer) - Decking: Inspection, replacement of up to 2 sheets of plywood (additional cost for more) - Underlayment: Synthetic underlayment (e.g., GAF FeltBuster) - Ice and Water Shield: In valleys and eaves (e.g., GAF StormGuard) - Edging: New drip edge - Flashing: Around penetrations (vents, chimney) - Shingles: New asphalt shingles (e.g., GAF Timberline HDZ) - Ridge Cap: New ridge cap shingles - Ventilation: New attic ventilation (e.g., GAF Cobra Ridge Vent) - Cleanup: Debris removal and disposal

This quote covers the replacement of a 45-square (4,500 sqft) roof, with the homeowner acting as the foreman, directly hiring the crew, and procuring materials. - Roof Size: 45 squares (4,500 sqft) - Underlayment: Ice and water shield installed over the entire roof, with cap sheet underneath - Shingles: HDZ asphalt shingles - Labor Cost: $5,100 - Material Cost: Approximately $6,500 (including about $1,000 for extra ice and water shield) - Dumpster Cost: $450 - Total Project Cost: $12,000