Good for getting a "feel" of the price, but you will always need to dig a little deeper to get an accurate number. 

I asked my handyman to dig a little deeper and sure enough she opened up to him about some very minor issues. 

Dig a bit deeper into your business plan and figure out what your actual return metrics are in light of your financing and business plan!

Don't want to dig a deep hole while in this situation.

First I dig a 3 by 6 ft deep hole , then I cross the yard to intersect the drain field pipe .

@Eduardo AguilarThanks for the info I will dig a little deeper into this.

He would have to dig a well and set up a septic system on the lots.

Told it was our fault and they were within their rights to kill the water line without notifying the owner & make us dig a brand new water line at our expense. 

Now a days in our market here for new construction they got away from draining to the street. ( save the Salmon) and so now we have to do on site containment.. this includes gutters to the downspouts that then tie into a line that takes the water to either an above ground rain garden. ( IE concrete box with plants that thrive in the wet. ) or like in my project in Canby OR  to the back yard were we have to dig a little mini drain field like you would  a septic system.. so water all drains from the roof to this little drain field in the back yard.. 

I'll dig a little deeper into a specific market/area.