Like @Andrew Steffens in the Tampa area or @January Johnson in the panhandle.

Based on the rationale, these are probably expensive, and possibly hard to get a service animals - plus the owner probably has emotional attachment to them - and you can never prevent a lawsuit from being filed even if you're not at fault.Just my 2 cents.

If your construction costs are wrong, you're in trouble....Attach a price to each of the following:General ConditionsSite PrepGrading/ExcavationConcrete/FoundationFramingElectricalPlumbingHVACWindows and DoorsWrap/Vapor Barrier/WaterproofingInsulation/FenestrationRoofingSidingDrywallCabinetsCountertopsTile/Stone/MasonryFlooringPaint/StainFinish/Trim CarpentryRailingsGlass/MirrorsOther

Tom's methods and program is great, we subscribe to many of the same techniques but we do not attach to the Wealthability brand. 

We take it a step further and even attach the owners email and cell phone number.

Should I follow this rule when investing in real estate.Recently bought a 550k house with an attached ADU unit thats projected to bring in atleast $1500 monthly income if it has a renter.

Though it might “seem” that you can arbitrarily attach the “tax basis as the fair market value” and thus receive $0 gain, the IRS would not respect this if you were selected for audit.

Also take a look at the tax record https://parcelviewer.geodecisions.com/Chesapeake/Account/Log... see what other kind of structure are attached to the building.  

Perform the same task in each app to ensure a fair comparison.Load a property with pictures and details.Market that property.See what your marketing looks like from the public's perspective.Submit a fake application to see how easy the process is.Run a credit/screening report on yourself.Enter a maintenance request, assign a vendor, and attach a fake invoice.Enter charges to the tenant's ledger.Enter recurring charges and automatic late fees.Sign documents electronically.Run owner reports.After testing a few apps, one should clearly stand out.

In that case, it may make more sense to convert existing components of a home (attached/detached garage) into additional rentable space rather than building an additional structure.