Firstly, the comments I made are specific to Rhode Island as that is where I got certified so if you are in Rhode Island you can either pay to have a lead check done or you can assume Lead is present. If you pay the $150 or so and no lead is present (in the areas you will be renovating) then you do not need to follow Lead Safe Practices. If lead is present then you have to follow the codes. You could skip the $150 in testing and simply assume Lead is there.
In MA and CT which are my 2 closest states, you are allowed to follow the new EPA rules which allow Certified Renovators to use the $4 test sticks that you can buy at Lowes and Home Depot; so yes, it sucks to be in RI.
After the work is complete, MA and CT allow visual inspection after cleanup has been performed, again done by the Certified Renovator. In RI, the rules have been made stricter and only lab tested dust wipes collected by Lead Techs or Inspector are approved to show the job site is clear. Visual inspection only cost the price for the materials, lab testing is going to be over $100 so again; sucks to be in RI.
Secondly, there are obviously lots of other parts to the new regs around how much space will be disturbed, who will be living in the house, etc but the key fact is that this applies to "compensated" firms and individuals and under EPA rules landlords doing there own renovations are compensated individuals as they receive rent so they have to follow the EPA practices and be certified. If you are working on your own house then you do not have to follow the EPA guidelines although it is recommended, esp if you have children.
I will leave it up the lawyers out there to discuss:
"what if my brother-in-law does the work an doesn't get paid and therefore isn't "compensated""
"What if I sell it before renting it"
"What if I was going to live in the house myself but changed my mind after the work was done"
"Are flippers considered compensated"
Fred