They add cost in terms of framing time, fire rating material, engineering, and spray foaming.

Isn't roofing material shingle or tiles and below that would be paper and plywood.

That's ludicrous, it's well within boundaries (and absolutely "material") to know not just a policy, but where it's coming from and the "why and how" as Carl says so we can advocate for our industry accordingly. 

But it does not mean a squat for figuring out taxable income.Here is a sample calculation for taxable income, with many details omitted:sales price of $495,000minus purchase price of  $340,000 minus closing costs at sale per closing statement (commissions, seller concessions, title charges etc)minus closing costs at purchase per closing statement (legal, title, origination etc)minus all construction costs: labor, materials, delivery, taxes etcminus all interest paid on borrowed money, for all lenders including yourselvesminus all holding costs (taxes, insurance, utilities etc) but make sure to not double-dip since they are often paid at closingsminus all other costs for the deal not mentioned aboveHere is what you have to ignore: all loan principal amounts received and paid back, because they end up a wash: whatever you received you ultimately returnedearnest money, because you paid it but then it was credited back to you at closing, resulting in a wash again.

This is a tough question to answer because some appraisals are more art than science.Generally speaking the higher quality materials used, better workmanship and look of the end product will produce a higher ARV.However, you have to know your comps and your numbers.

I can barely get any money out of used construction materials.

There's two packages one is the Home study package for $59 which includes a CD-ROM containing a slide presentation and Study guide with over 150 pages of review material and 45 days of access to the EZprep website.

Backoffice database driven (keeps track of all your leads) 3.

Offer him $30/hour (plus materials) and tell him he can have access to the house whenever (nights, weekends, etc).  

Strategically, you have to either remove the source of the odor (porous material), seal or encapsulate it.The drywall and baseboard trick you mention is important.