Opportunities to expand their portfolio?

The combined costs for grading, surplus disposal, gravel base, asphalt, curb and gutter, manholes, sewer laterals, and sidewalks could easily be $200 per linear foot for a 20' wide street.

Usually I will expand the area and look farther back in time before looking at under contract comps.

You can easily do this on a spreadsheet, and it will take less time to track than finding and learning new software.

Asset protection can be pierced easily.

Ill keep expanding my horizons.

So by putting everything down on paper, you can easily correct the client and keep things moving.You mentioned timelines....those are hard to get everyone to agree on in the original contract because a Contractor knows that a customer nowadays will start changing things as soon as they watch that episode of HG TV with their glass of wine.I included on my Change Orders a line to add time to the project in addition to the added dollar amount.

They'll crack easily otherwise. 

However, that requires us to dig down the basement floor to meet the ceiling height requirement (it's got the egresses and 2 exits already), and I think that can easily cost us $100-120k.

You can easily do this on a spreadsheet, and it will take less time to track than finding and learning new software.