average cost of replacing ductwork
1 Replacing aging, leaking or inadequate ductwork typically costs about $35-$55 a linear foot for labor and materials, or $1,000-$5,000 or more for a single-family home, depending on the length and type of ducts used (sheet metal, fiberduct or round flexible ductwork) and local rates. And a Virginia homeowner reports spending $450 for DIY installation of modern ductwork in a basement (the least expensive bid for professional installation was $2,500).