When I built my house, I took a Matterport scan before the drywall was put in, and again after. Best decision I ever made. It's like X-ray vision for walls.

It's handy to know where wiring runs are, how many studs are between windows when mounting tv's, and a dozen other electrical, ac, or plumbing issues. I used it once a week initially and probably once every two months now that we're settled.

Also recommend a Dymo Rhino 5200 cable label maker with heat shrink tubing. I print the label on some heat shrink, attach it to a wire, and never wonder where anything goes again. Great for vehicle wiring harnesses too: https://www.youtube.com/watch?v=-LcUQeTzIo4&t=66s But I'd recommend the 5200: https://www.amazon.com/DYMO-Industrial-RHINO-Label-1755749/d... - non-affiliate link.