Zimmer & Kohl Contracting Co.

The service went fine. They weren't the lowest bid, but they were close to the lowest bid, and I used them because their timing and everything worked for me. They gave me a decent bid, they completed the work when they said they would, and they were on time, and on budget. We had some discussions, but it all worked out.

It was a nightmare. Took five days to tear out the driveway because they were using electrically powered jackhammers (using our electricity). When that was 3/4 done, the contractor demanded another $5,000 and threatened to abandon the job if not paid. Driveway was paved using a small batch concrete truck during a period of 100 degree heat. Resulted in uneven pouring and discoloration. New driveway ended up almost 3 inches higher than the old one which completely screwed up a drainage system from our downspouts that we'd had installed a year earlier, We ended up firing these clowns when they demanded additional payments and contracted with someone else to do the front walk, make the concrete saw cuts and install the caulking. Would never, never hire them again for anything.

The building inspector had them redo the a portion of the roof for the 3rd time.  He started in August 2011 and has yet to finish warranty repairs, damages to my property from his employees, or correct punch list items. 
We did note they went from an A- back in 2011 to a C- non-affiliated with the BBB.  If you want somthing quickly and correctly do NOT use this vendor.  They have excuses for everything.

Start to finish the project was trying to say the least.

Everythng went very well. Work was performed in a timely manner and looks great. Couple of small things had to be corrected to my satisfaction, but overall, I was very pleased with the work.