Here is the rehab estimate for the renovation in that scenario (CLICK ONCE OR TWICE TO ENLARGE): Once we close on the property, we'll get contractors in and start getting bids -- given that this will be our first rehab in Maryland, I have absolutely no idea if my estimates are close or not...

So, I suspect that can't be re-used as a garage or a pole barn.The property can't be enlarged and continue to be used for a non-conforming use.

Scope of work on an $80k budget is: * build out ofbasement apartment down to the studs* upstairs new kitchen on existing footprint* replace/enlarge 2nd story rear deck* new roof, door, & electrical for 2 car garage* add a bathroom in existing finished space on the 2nd floor OR rebuild one gable at a lower slope to allow finishing out current space under the eaves as a master suite* perhaps other stuff we haven't thought of The questions are A) how do you approach down-to-the-studs level remodel projects? 

Method 3 sound closes to what appraiser would do, AFAIK in case there are no similar comps nearby, they would simply enlarge the search range.

The hardest thing was I had to enlarge and deepen the bolt pocket but that is it.

You are cleaning the grout but you are also opening the pores of the grout to more dirt.

This implies that often to replace a bedroom window requires enlarging and lowering the window. 

It depends on what is directly underneath the laminate floor, is it pores material that will absorb it such as wood or is it a vinyl or concrete underpayment.

@Andrew Brohard - Around 600 SF sounds right for an enlarged garage.

The reason it was so humid was because moisture was entering through pores in my foundation.