Just because you can see perforated vinyl or aluminium soffit under your eaves does not mean there is not a solid soffit, or mis-installed vapour barrier underneath (especially on an older home which may have originally been built with wood (solid) soffits);make certain your roof is vented at the top (either with a ridge vent {preferred} or several roof vents such as pagotas or ventilators {acceptable}).  

@Jonathan Gilkeson  absolute last place I would buy   buy and hold I small properties Is TEXASyou do not benefit from no state income tax.. property taxs are off the charts and soil conditions almost always assure you of major repairs in a given 5 to 10 year holdMany many other markets that are comparibale.. and do not have these inpediments I see Texas as a locals market so they can take advantage of no state income tax.

I know how frustrating it is to have a great deal under contract just to have it all pulled out from underneath you. 

I havent heard of one in WI that requires more frequent pumping. yes no disposal, and advisable to have a filter on the washing machine discharge as well, and good idea to have them drop enzyme tabs monthly as well, but in all honesty, a good working system will work  20-40 years (average life expectancy) or longer with out any issues. around here a 3 bedroom system replacement (tank and drain field) runs around $5-$6K but a mound with clay soil can easily exceed $20K so lots of variables. 

I tore the wallpaper down and there was brown paneling underneath. 

Question is more about acquiring the skill.Demolish Concrete and put soil and Grass on sides and backyard2000Pest and Termite Work8500Gas Heater Replacement4500Asbestors Duct replacement1500Popcorn Ceiling with Asbestors scraping 2500Floor replacement7000Painting Interior2000Kitchen countertop change6400Appliances4000 (2x refrigerator,2x stove,1xdishwasher,washer & dryer)Minor Plumbing Leaks200WindowsReplacement(8x) 2400Toilets x2500Chimney3000Misc Repair1000Paint outdoor3500move water heater inside the house2000Replace two side doors 1000Thanks a lot for your time.

Any idea what kind of soil under the foundation?

Do we seriously have to pay for a high dollar soil test prior to foundation? 

It sounds ridiculous to have to tell tenants this but I do so because I'll never forget the incident when I was in graduate school and my girlfriend at the time had her Lexus covered in T.P. and human waste because her roommate, Susan, was flushing tampons down the toilet, clogged the waste pipe and as fate would have it my girlfriend had her parking spot underneath the waste pipe (and the plumbers did the work without telling her to move her car).She was so mad.

Does anyone know if you need to have Soil testing done get an EIN or get a civil engineer to build an ADU on a property with an existing SFR?