They were not truthful about dates, kept using the excuse "our other customers" and did not disclose mold in our basement and sent someone to clean it up but fortunately I was at the house when they arrived and the individual showed me all the mold. That employee even said that Cornerstone lies to their customer. The final straw was less than a year in our home we have an infestation of flies in our home from the insulation that we are having a difficult time getting rid of. They hatch in the fall and we literally have thousands of flies. We bombed inside the house 3 time and they die but keep hatching more. This is our second fall here and we still have the problem. Has anyone else ever had this problem? Argonne, WI read more

What they are ok at: preliminary design plans and prefabrication of the shell -What they are bad at: everything else -It took them 2 years to complete my 1,800 sq ft home with no materially significant Covid delays. They projected 6 months to complete the project, but it took 4 times that. And it was only completed in that time because I project managed ~half of it myself including communicating with their subs, sourcing some materials, coordinating activities, and finishing much of the interior work and details myself. And the final punch list dragged on for 6 months and was only completed after I made it clear to them they were in breach of their own contract, out of compliance with Wisconsin Right to Cure Law, and built some items out of building code parameters. -The actual build cost was ~20% higher than their contract price due to them under estimating costs of key items like well drilling and neglecting to properly include all the necessary scope in the estimate (missed insulation, framing details, etc). They manage their risk of underbidding by putting as many items as possible under 'allowance' so the cost overages just flow to the owner. Further, they track very little electronically and are not even able to provide weekly reports on actual spend against budget/allowances - they just assume you'll be fine with whatever costs are incurred. Take their bid and add at least 40% to get the actual end product you are envisioning by the time you account for their underbidding and account for upgrades to the entry level doors, cabinets, trim etc that they estimate in their base bid. -They submitted payment draw requests to the bank for work that wasn't fully completed and then turned around and charged interest on the payments they didn't receive for the work they didn't fully complete. When I questioned their admin about the invoices, she responded 'I can't help, I just mail the invoices'. -In the rare occurrence their project manager showed up at the job site, he didn't bring any drawings, specs, contract docs or even a notebook. Their overall communication and professionalism was poor and they would regularly not respond to texts, calls, and emails. They also struggled to track items that were picked out for the house, which should be a standard process when their name includes 'custom'. For example, I picked out all my door handles from Home Depot, added them to the online shipping cart and then emailed the shipping cart link to Cornerstone. All they had to do was enter payment and shipping information online and click order. Six months later I learned that they never ordered the door handles, at which point some were not available and some cost more - and they made me absorb the higher cost. -There was no project schedule or attempt to create or adhere to a schedule. There was no urgency or concern about getting the project done to meet the timeline they originally promised. -During my project, the Cornerstone owner allocated subs to complete his own personal condo development in Minocqua, even though it was started months after my project and subsequently completed almost a year before my house. The Cornerstone owner even asked me if I could find my own subs while he used the available ones on his project. Clearly their business investments were a higher priority than their customers who signed direct build contracts with Cornerstone. -Most of their subs (except the the ones that were felons that they clearly didn't run background checks on) were reliable and generally capable. Cornerstone just simply doesn't know how to project manage and coordinate their subs around efficient timelines. -While their reviews online are relatively high, there is a small number of reviews and they are outdated. If you want additional feedback or reference information, write a post like I did (though I should have done it before I contracted with them) on local Facebook groups and ask if anyone has used them and you'll find the same feedback I'm posting here. -Unless you are fine babysitting them everyday and having your time, money, and life tied up for many years while they fumble around, my recommendation is to use a different builder, even if you have to wait. At most, I would only use their design/pre-fabrication services and do all the subcontracting myself. -While they ultimately finished the project, it came at my own personal financial, mental, and physical well-being and was the worst most drawn-out experience I've had with a company. read more

There were over 40 building code violations and over $120,000 worth of other poor workmanship issues. They refused to correct about 90% of the isssues read more