Where these quotes come from

A single-family roof replacement in Gardena typically runs

$13,000 to $33,000

What that is based on. Public installed-cost data for California, adjusted for how Gardena is built, on a typical 19 to 31 square roof — about 1,900 to 3,100 square feet of roof surface.

What moves it up. Steep pitch, two or three old layers to strip, tile or metal instead of shingle, soft decking found once the covering is off, and a lot of chimneys, skylights or valleys.

What moves it down. A simple single-storey roof, one layer to remove, a truck that can park next to it, architectural shingle, and a crew booked outside the busy season.