BP is designed to educate and network, but there seems to be a misconception it replaces high cost "guru" garbage. 

I like the search features: https://www.biggerpockets.com/search

Sold it off Facebook posts (we caught some steam with some of the design stuff we did and attracted buyers early ) for $269k after some closing assistance , paying my realtor $3500 and all other costs associated we will net $62,000 !

With properties sitting vacant in those good areas I can look at it and most times spot the issue (bad sightlines, bad access, bad building design, bad parcel layout, stuck behind other buildings, etc.)

Feel free to share your own examples of your favorite marketing descriptions for the rest of the community.Example Format: Attention Grabbing Headline, Touch on Location, Highlight Homes Best Features, and Touch on Any Disqualifiers/RestrictionsExample Description:2 bedroom, 2.5 bath townhome in a fantastic West Des Moines location near the Des Moines Golf & Country Club, Waukee School District, and close to I-80!

Once you've done that a few times you can start guesstimating by sqft and building features. 

I also have language in that addendum that defines who has what responsibility for maintenance, repair, limits of expenditure based on features of appliance and cost to repair. 

Be aware though that there are many modular companies and some are more expensive than design/build custom ADUs.I would also agree with with Andrew, a conversion of an existing space (like a garage) might be the cheapest.Also, check with your city laws on what's an allowable ADU to construct based on your current home and rental regulations for them.Collin

How do you handle the design aspect; do you hire a designer or do this yourself? 

Short of the NOLA metro area, a massive portion of LA is considered rural enough to be eligible under that program, and has a few extra features that the FHA loans don't, most significantly is 100% finance option (zero down payment), but also can support new builds, such as you picking some land, dropping in septic and well, and then building a new home (or placing a permanently attached mobile), additionally, while there is a PMI requirement, the rate for the PMI is lower than FHA's requirements.Also, check out LHC below, as they may additionally throw in some dollars towards your purchase, regardless of if you use FHA, USDA or Conventional, so you might be able to get them to cover a good chunk or all of your closing costs.