I couldn’t recommend Glass Blocks of St. Louis more highly. They were fantastic! We had seven very old, single pane windows in our basement and had them replaced with glass blocks for much better security and insulation. We had considered doing the job ourselves, did a bunch of research on it and in the end decided on just comparing it to having a professional do it. Thankfully we did. Four of the seven windows had rot in the frame(very old house) and we would have been in over our heads making the repairs. The finished product was beautiful and done very well. This was definitely one of those few times I’m glad we didn’t try and do the job ourselves and just paid to have the job done right. Additionally, it was fast, just a couple of days due to the frame repair setback instead of the one window per weekend we thought it would take us if we did it ourselves. So yeah, they did a great job. They were clean, nice, friendly and thoroughly professional. I would totally recommend them to a friend.