Creating a scope of work is the key to estimating rehab costs.

I agree that there are ways but 1) rent ready without value add will be huge cash negative with realistic expense estimates 2) most single unit ADU additions cost more than the value added.  

Obviously this is a very rough estimate of the selling price.

What I have learned is the usefulness of the lead-generating sites is very market-specific.If I were to estimate, in the last two years, my lease-ups came from Craigslist (20%), Apts.com (20%), Zillow (30%) and FB (30%).Most of the responses from my ads come from Zillow (40%) and FB (50%), but most of those leads are woefully unqualified (especially FB). 

Estimated value is about $404,379 but may not be accurate(it’s the amt that shows on my mortgage companies app).

I’ve gotten estimates and it is 45-53k.

Currently, Bitcoin mining is estimated to consume more power than is used in the entire country of Ireland per year.  

Closing costs also very per lender so I would recommend asking for a loan estimate and looking at the bottom line.

Now I plan to build a real estimate investment portfolio focusing on a buy and hold strategy (BRRRR) through multifamily properties surrounding the Snohomish County and Everett area (north of Seattle).

This would be quite the analytical marvel to even effectively ESTIMATE this with any reasonable level of certainty/confidence (even for someone appropriately trained).