There might be outliers here and other's may weigh in, but the "non credit/lender" bills you're referencing generally are not considered in your credit report for positve payment history. On the flip side they can be and likely will be included in your credit report if they go to collections (negative impact on your credit report); or you use the relatively new BOOST option with EX, the only CB currently that takes positive payment information into account for non credit/lender accounts.
But the fact still remains, pay ALL bills on time. The positive impact of paying these type of bills on time is that it doesn't result in a negative impact on your credit report.
It can for Experian using their new credit boost option. Their site is free to create an account & they also give you your FICO8 credit score. 😊
Thanks 
I do pay all my bills on time, and I have an excellent credit score.
My problem is that I just don't have enough information on record (plenty of length, but not enough items). That's why I want to know what kinds of things they count.
Well, that and having extremely low income.
@Anonymous wrote:Thanks
I do pay all my bills on time, and I have an excellent credit score.
My problem is that I just don't have enough information on record (plenty of length, but not enough items). That's why I want to know what kinds of things they count.
Well, that and having extremely low income.
That's Awesome! It's been stated here often that 3 revolvers and a loan is enough to achieve what it seems you already have, an excellent score. I'm not exactly sure of the numbers other than 3 revolvers.
Depending on the length which you say is plenty, to improve the "not enough items", obtaining new accts is what can help with building a thicker credit file. I know that's obvious But for many the impact of a new inquiry and reset of AoYA may not be a relevant loss in the process of whatever the goal is. Particularly if you have no upcoming need for a major loan, like a MTG.