When I was renovating my new place last year, i took 3-4 months of planning and going back and forth with the ID. Honestly if I didn't it would have turned out to be a big headache, and also I visited the site ever 1-2 days because from past experience i know the contractors won't follow 100% the plans, either due to the ID or main-con did not pass the latest revised plan or plain assumptions.

One of the most fucked up incident is the sub-con wanted to skip work when they forget to precut a hole thru my upper kitchen cabinets for my cooking hood and suggested to straight pipe to the yard window rendering it to be unable to open in future.