Try the PaveSnap widget

This is exactly what sits on your website. A homeowner finds their address, traces the driveway, can optionally take photos, and gets an instant ballpark. Then you get the lead. Search an address, hit Draw driveway, and trace the outline like a marker, then click Done — close & fill. Got a circular / horseshoe driveway? Trace the paved parts, then Cut out the grass island so it doesn't get counted. Once you have a number, Refine this estimate adds what a satellite can't see: tear-out, thickness, slope.

Demo uses sample asphalt rates. Your version is set up with your own pricing.