Or hung a toilet paper dispenser 4.install closet rod.

Rip all the ceilings out, install furring strips and drywall.

If they seem agreeable, then you can ask if they would prefer to cut the cost down the middle or would they prefer to purchase the supplies and you will assume the cost of labor to install it. 

We get granite for around $40/ft installed from a local shop. 

Depending on the flooring specs you *might* be out of luck because a lot of LVP/laminate type flooring specifies on the install that straight runs will be no longer than X number of feet and room changes will be installed with a transition.

I am looking at 1 acre of land with a well and a septic already installed. 

Still need cabinets vanities counters installed, floors done, drywall hung and finished.

We typically pay somewhere in the range of $3500 for a new, basic furnance, including install, if there are no other modifications to the system required.  

Can anyone recommend a reliable plumber or handyman who could install it for me?

To add value to the property, we undertook extensive renovations including the removal of over 40 yards of trash, installation of a new septic system and wall-hung boiler, and a new well pump.