When I did mine last year, I thought I had everything mapped out, but the numbers still shifted once we opened the walls. What really helped wasn’t cutting corners but being picky about where money actually mattered. For example, I didn’t go for the most expensive tile, but I did pay extra for a better waterproofing system because I knew that’s the part that prevents headaches later. Another thing I learned was to ask the contractor to break down the quote line by line so I could see what was essential versus optional. When I started planning the second bath, I used this approach from the beginning and also checked a few layouts and ideas from
https://luxxremodel.com/ to get a sense of how different designs affect pricing. Having even just a rough idea of what features push the cost up helped me avoid choosing things I’d regret later. My biggest advice: leave a buffer, even a small one, because something always shifts, but you can still stay in control of the overall spend.