Best glass block pros near Colmar, PA

"When we picked up the glass yesterday evening, we noticed one of them was wrong size (the glass was less half size of our table). 
They came in today and measured the table again.
Mistakes happens.   They acknowledge it and move on remediating it.  Great company
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"It took me almost 2 years to find a contractor to do glass block in a basement window well where water was coming in. I found D. Karpel Construction thru Angi.com. Mr. Karpel contacted me within 1 hour. A superior contractor. Figured out the problem and in less than 2 days had the job done. A job extremely well done. He is very highly recommended."

"She has made stained glass window hangings."

"They only charge $1,000 for the entire roof of my garage, and it was a good deal. This included removal of all the old shingles, and hauling all of the used material off the property to the dump. -Debra Castrinos"

"A lovely piece of leaded glass in our front door was in need of repair. These guys were beyond excellent. Knowledgeable, skilled, honest, pleasant, just plain nice. The repair was seamless, and the price reasonable. Great, great work at a fair price. We recommend without reservation."

"I sent a picture of the broken glass around 8:30. They were at my house around 11:15 and done by 11:45. Great job including clean-up. I really couldn't be more satisfied."

"Truly amazing Business, 100% Recommended They were able to come out the same day i called and took care of my sliding doors problem without any issues."

"Very nice & extremely professional. Would highly recommend their services."

"I dealt with Darin for these projects. The one thing that stood out was the professionalism. Right from the start we knew the dates of the projects and were kept in constant communication. The work was done well and everyone was very respectful. These weren't huge projects but we were still treated as if we we're an important customer. I would highly recommend them and use them again!
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"Made an appt. with Castle Rep, James, for 17 windows and vinyl siding. He spent 1 hour talking about how great his company and windows are before finally getting down to the issue. We were told that CASTLE makes and services their own window, with all the best technology and technicians available. The price per window for energy efficient came out to over $1,200 per double-hung window! And since they make their own products, we could not find a way to compare quality and price with other manufacturers. But his per-window price exceeds the average price of $500-700 by A LOT! When we balked, he made a call to his "manager" to see if we qualified for a "special promotional" discount. If we were to commit right there on the spot, we would get an additional 10% off! Still way to high. We said we would think about it (he got sad and snippy), and that we wanted to hear about the vinyl siding quote before we made any decisions. He told us he could not give us a siding quote until his company did an "eagle view" measurement, which would require another appointment! We had no intention of sitting through ANOTHER high-pressure appointment. High pressure, long-drawn out presentation and he would not leave us with anything in writing! No brochures, prices, nothing! He refused to put anything in writing and we could not have a break down of labor and costs. I even asked him if I could have a copyhh of the window warranty and he said "only if you purchase right now." And they did not come prepared with references or previous job locations! When we further researched the company, we found they did make very excellent products, but the #1 complaint was by far that they did not honor their lifetime warranty and that customer service was horrible. In the end, we chose not to do business.."