However, I have some advice for constructing certain buildings. There is no perfect order of placement, and I think this is the fun part of the game. So if you build a room mentioned in this guide 'foundations' button, don't forget to add 2 each dimension. It really srews you over if you planned everything ahead.
In many other guides, I read this and made the mistake of creating 5x4 buildings rather than 7x4 to accomodate for walls. Note: When I mention room dimensions (eg 5x4), I am refering to the inside of the building. Just keep this guideline in mind when contructing these buildings: 'This is only the beginning, don't close yourself in with the first rooms!' Make sure to have room for expansion and plan ahead! It is advisable to have either a grid system of building (where you have blocks of four buildings with paths inbetween) or a central path system (where you design your buildings around a central path, usually two squares wide, with branches of square-wide paths sprouting off it leading to other sections) (hint: there is a planning tool). You will build the required buildings for the first two grants (these being Administration Centre and Basic Detention Centre). The layout of a new prison is super important because it will set the trend and direction of your growing prison.