You will also want to update any installation costs estimates to help you to determine if you will be doing any of the work yourself. For example, you might want to demo and then have help from someone to install. After you confirm that all items will fit both physically into the plan and into the budget, you can start logging the specifications. This is when you can modify your budget or update it. Basically, that means you can eliminate the low/high columns and have just one along with space for more information. You will have a new row dedicated to labor as well.