Short Answer
Price should be considered alongside scope, quality, credentials, warranty and execution.
Detailed Explanation
The cheapest contractor is rarely the best value. A significantly lower price usually reflects a smaller scope — less underlayment, no ice and water shield, reused flashing, cheaper materials, no ventilation upgrade, no permit, or inadequate insurance. The contractor with the lowest price isn't necessarily doing the same work for less; they may be doing less work. When you choose the cheapest contractor, you risk: a roof that fails prematurely, warranty issues (if the contractor isn't manufacturer-certified), liability (if the contractor isn't properly insured), and difficulty getting warranty service (if the contractor goes out of business). The right comparison is value — what exactly are you getting for the price? — not just the total dollar amount.
Why It Matters
The cheapest contractor often costs more in the long run through premature failure, warranty gaps, and liability exposure.