When I replaced the windows in my first house, the quote I got looked straightforward, but a couple of things shifted once the installers started working. The final amount wasn’t dramatically different, but they did find moisture damage under one sill that added a small repair fee. What helped was that the crew explained it clearly instead of just tacking on charges. In my case, the overall difference was maybe ten percent above the original estimate. Before choosing a company, I read up on how quotes are calculated and which details matter most, and the guide on replacement windows really helped me understand the breakdown. The biggest surprise for me wasn’t the price change but how much installation quality affects long-term durability.