When you're budgeting for a new roof, the size of your home's footprint drives most of the cost—bigger roofs need more shingles, underlayment, and labor. A 1,500-square-foot house might run you $6,000 to $12,000, while a 3,000-square-foot place can easily hit $15,000 to $30,000. But it's not just square footage; pitch, waste, and any chimneys or skylights add to the totals. Most contractors price per square (100 square feet), so knowing your rough roof area helps you compare quotes. Just don't… roof replacement cost by roof size 16