I do believe this venue will give me greater access to people and tools.  

However, this requires careful legal handling.Other options:Reverse Mortgage: If your parents are over 62 and the home is their primary residence, a reverse mortgage might be an option to access equity without monthly payments.Home Equity Loan or HELOC: If you have significant equity, consider a home equity loan or HELOC to cover your parents’ rental expenses, then repay it over time.The Good: Co-ownership can provide financial relief and shared responsibilities.

If it's a vinyl window, or if you could swap out the existing window for a vinyl window without much hassle (e.g. if it's on the first floor and you have easy access to the exterior), then waterproofing the inside shower area around the window would be much easier.  

We would call the CFPB for clarification on what was/wasn’t allowed for advertising and they would refuse to answer, but would give us $10,000+ dollar fines if we guessed it wrong (@mortgagenmore).”On Taxes, is the 1031 Exchange still Legal?

Did they also have access to the yard where you are building the ADUs?

You may need permits for plumbing, electrical, and structural changes.A HELOC can be a flexible and cost-effective way to access funds for a down payment on another property. 

I take less issue with equity pay down but this certainly has a cost to access.  

I am fully educated on what's public online/and how to access that easily, and I'm looking around for subscription/pay options that offer more "actual raw data" (on deeds, history, leins and public records) than the county sites, basically.Research--for anything I identify as potentially interesting.

Does he have assets he (or perhaps you) can access to be compensated by - either voluntarily or if you end up in a legal fight. 

Required repairs for federal lending approval are generally more easy to include.We've seen folks with helocs attached to the property who have accessed the heloc to repair the property right before the sale since the heloc has to be paid off as part of the sale.