no not an additional 30 day wait.If I were you I would not wait to get grow room ready to start growing if you are doing construction you don't want the plants in there while you are doing it.Are you doing "dirt" soil or are you going high tech with hydro system?I am old school and started my grow with dirt but it grows so slow that I have started to look into a hydro grow after this.The costs are higher to get started in that you need meters for PH and PPM but I think they would pay off in the long run because the plants grow so much faster.Also with hydro there is that learning curve