Window replacement costs in Wilmington

On the North Carolina coast, the word for your window job matters as much as the window. In a 2012 interpretation of the state residential code, the Office of State Fire Marshal said windborne debris protection is required for windows, doors and glazing in the exterior walls of coastal dwellings.

For an existing house, it drew the line at the frame. Swapping just a pane, or just a sash, counts as maintenance. It doesn't add a protection requirement, unless the old window already had protection. Taking out the window but keeping its frame is an alteration. Taking it out frame and all is a renovation. In both of those cases the replacement must meet current code, windborne debris protection included.

The same interpretation covers additions. A new sunroom or bedroom has to meet current code on its own, but the rest of the house can stay as it is, provided it complied with the code in force when it went up.

Wilmington's housing splits almost down the middle: just under half dates from 2000 on, and the rest is older. So new sashes in an older house and a full tear-out in a newer one can land on opposite sides of that line. Before work starts, ask your installer which of the three your job is: maintenance, alteration or renovation.