We have done business with Mainstream for the last 15 years,2005 had new roof,gutter guard,and blown in installation done.2010 we had new replacement windows and doors installed.2019 had 2 windows that were left to complete the whole house. Mainstream has been one of the best companies I have done business with the whole team from sales,to installation, to any follow up question or minor problems have been handled in the most professional manner. Mainstream is a great and professional company to do business with and I would give them an A plus referral, great job keep it up.

I would recommend Mainstream to anyone I know without hesitation. They replaced every window in my house - 21 windows total. The entire team at Mainstream is amazing. Spencer came to do the quote, showed me samples and explained the options I had. Tim checked measurements before placing the order, and when the windows arrived they were able to get them installed much sooner than I had expected. The team cleaned up after themselves, and they were done within a couple of days. Tim and Spencer both checked back in after the job was completed to make sure I was satisfied. Even calling to pay the balance once the job was complete was a pleasant experience (thanks, Marcy!). They are hands down the best in the Quad Cities, and as soon as I need a new roof, Spencer will be the only person I call for a quote.

Very impressed. The sales guy was great, had a great sense of humor, and was no pressure. The construction crew were curteous, very professional, did a great job putting on the new roof, best part was they didn't leave a mess.

Mainstream Home Improvement did a great job on installing 6 windows and repairing 3. They got this done in one day. They have superb customer service and were a pleasure to work with.

We have been with Mainstream since June 8, 2009 when they replaced our windows. Since then they have installed vinyl siding, new gutters and a new roof. We were happy with each job. The latest job that we had them do this week was the replacement of a 40 yr old glass sliding door for our deck. Cedro and Tony did an outstanding job. Cedro, the lead carpenter, takes pride in his work. In this day of fly by night contractors, it's wonderful to find craftsmen that enjoy what they are doing and take pride in their work. On another note, these Google reviews for Mainstream included a one star rating from some gutless person that did not identify themselves. Please don't take any such rating into account. It was obviously one of the fly by nighters who is jealous of Mainstream's outstanding performance.