Therefore right now I'm considering using a service for submetering and then billing separately (currently I live in the ADU and rent out the main house).Does anyone have experience with this? 

Having each service separate can often result in delays, inefficiencies and more work for you as the owner.

We don't allow any "deal-making" in the forums, which includes advertising your services or properties, looking for partners, etc.

It should be as easy as converting one conventional loan that cashflows well to a Debt Service Coverage Ratio loan or DSCR.

I hope you are asking two separate unrelated questions, because there's no point in doing cost segregation for properties held inside your self-directed solo 401k, save for some very rare exceptions.Some of the Bigger Pockets experts who operate reputable costs segregation companies are @Bernard Reisz, @Yonah Weiss and @Julio GonzalezSome of the Bigger Pockets experts who offer Solo 401k administrator services are @Dmitriy Fomichenko, again @Bernard Reisz and @Brian EastmanReach out to them and see if they can help.

They have to collect the data, confirm the data, then publish the data for the public.

I don't think it's right to do that and especially not in a public forum so I was "forced" to set the record straight.Mind you, the irony of that discussion is that I suspect we aren't probably disagreeing on much.

You pay the contractor for their services and then keep all of the profits. 

And it would blow your mind the massive demand for there service.

Their customer service is great.