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"He started by replacing the screen door. He hung it out of square but he denied there was a problem and made no effort to fix it. I insisted and finally the door was re-hung by one of his crew. He power-washed and sealed the deck. The product he used has sand in it, which I didn't know and it feels gritty when I'm barefoot. Densing told me to rent a small dumpster from a particular company, which I did. There was a lot of junk and trash in the basement, accumulated over 30 years, and he worked hard to haul everything up and out to the dumpster. My husband's workshop was of particular concern to me; I asked him to set aside anything that looked to be in usable/good condition so I could look at it. Unfortunately, he didn't do that, but just put it all in the dumpster, so I have no idea what was thrown out. I also needed to rent a second dumpster, which may not have been necessary if he'd done a better job estimating what he'd need. There were unanticipated problems in the basement, which were necessary but costly repairs. Densing required payment in advance for any supplies, plus 60% of the total when he started. There was mold in the drywall and in the insulation behind it. He said he would treat that, put up a vapor barrier, new insulation and new drywall. All of that was taken care of - it looks good and there is no odor. We also found quite a few cracks in the foundation walls, which he said he could repair with an epoxy-resin sealer. I did get another opinion and estimate and decided to have K4 do the work. Densing said he would give me a receipt and documentation that would satisfy any prospective buyer, if I decide to sell the house. I'd also like to mention that Densing and his workers used my refrigerator to store their soft drinks and went into my kitchen cabinets for glasses. Without asking or obtaining my permission. Densing suggested I replace the 2 basement windows and asked for the money to order them, nearly $500. I've heard a couple of different stories about why he hasn't gotten or installed the windows, but he did not reply when I asked for a refund. Work was also left undone after installation of a drain under a flagstone and gravel walkway in the backyard. The work was sloppy; a lot of the gravel disappeared and it's now too low (didn't replace enough soil) and the flagstones are so poorly set that some rock and none are the correct distance apart for anyone's stride. The chimney needed some tuckpointing Densing said, but the result is a sloppy job. No one has returned to fix anything, in spite of promises. I'm especially concerned because I have not received ANY paper work from K-4. I do not have contracts or receipts for the work done. He did not provide the documentation for the repair of the foundation cracks, as promised. He will not respond to phone calls or texts and has apparently instructed his crew to do the same. They've moved on to a bigger project and I don't expect to see or hear from them again. Although the workmanship, for the most part, was of good quality (with some re-do's), Densing's manipulative manner and boastful attitude were problems. He spoke derisively about everyone he has worked for, especially the owner of the paint company for whom he was working when he started his off-the-books work for me. I should have been more careful, but all of his talk put me off-guard, as he intended, and I foolishly thought he was trustworthy. He requested that I make all checks payable to his girlfriend, not to him or to the company. Although I know it's a huge red flag that something isn't legitimate about him or the company, I paid his girlfriend. I would not recommend K-4 Konstruction or Mark Densing to anyone."