It depends on what type of installation we’re doing. For example, if we’re installing retro-fit windows, there will be zero damage to the surrounding wall. But if we add a Block frame, there might be a possibility that we’ll have to paint the interior wall because we’ll have to add a new trim in there. However, don’t think that by adding a replacement window, your walls will crack or break or come down. That’s not true. Even in a worst-case scenario, the damage is very minimal and we’ll take care of it in no time.