Les Grumdahl Window & Siding Staff,

We have a whole new, uplifting feeling about our day-to-day life due to the beautiful work done on our home by you.

We were guided through the selection process for windows and siding by patient, knowledgeable staff. There were so accommodating, with samples for color and style selection and accurate pricing information. Thank you. We are so satisfied with the design results.

On the window replacement and siding preparation crew, chief Jamie inspired total confidence in his accuracy and expertise. We were happy to have been able to utilize a quality Minnesota product in the Marvin Window EverWood Infinity Complete Replacement Units.

The U.S. Seamless Steel siding in a natural grain TruCedar finish is even more handsome than we thought it would be, and the trim work is perfect. During the application of our new siding Terry & Paul worked together as one! Remarkable! Chief Terry framed out our older, lower lever windows as only an innovative master craftsman could have done.

The courtesy and diligence of your crews was exceptional and there was careful, precise workmanship throughout.

We don't have what some would call a "fancy" place, but your makeover makes us feel like we do! Thank you so very much, one and all.

- Gary & Ellen H.


Thank you. We love the siding on our house and garage. Terry is a skilled craftsman! He is friendly and courteous. 

- Paul & Mary

Ryan, Jamie, & LGWS

Thank you very much for installing a new window in the snack shack at the  rink. Your kindness and generosity are greatly appreciated.

- Sincerely, Jes (Two Harbors Youth Hockey)

Les & Team,

Duane and I can't thank you enough for your quick response to our need for a contractors help! When we saw the extensive damage when opening up our wall - we knew it was beyond a homeowner's repair job. You guys were amazing! Thank you so much for coming quickly to assess the problem and put a plan in place for the repairs and doing the work quickly! 

You guys are the best! - Duane & Mel

Les Grumdahl & "Crew",

We want to thank you for the beautiful and functional windows. Being that this was our second window purchase from you, we were still pleased with your process. 

Your "crew" was outstanding, they were friendly, respectful, and fun to have around during the process. Their workmanship and attention to detail was appreciated and completed to perfection. 

Thank you for your honesty, integrity, and beautiful product. It was indeed a pleasure to do business with you and your crew.

Sincerely, Bob & Darlene D. (March 2018)


March 14th, 2019

Hi Les,

I want to thank you for replacing our living room window last December. we were shocked to return home from being away for 10 days and to have the house coldand the furnace running. you had the solution and didn't hesitate to make it right. 

I hope you have a pleasant spring and a prosperous summer season.

My regards,


June 3rd, 2019

Thanks, your team did a great job!

Dave & Peggy B.

July 29, 2019

I have hired Les Grumdahl for window installation on three occasions over several years.  I have a large historic home.  This team has been fantastic.  Always working hard to get it just right whether it was color, size, timing, they have worked with me.  Jamie, one of the team, is a delightful guy, happy to go the extra mile, great attention to customer service and hard working.  The windows have greatly reduced street noise and heat bill costs.  It's always a tough call to replace original windows on a historic home, but once I did it, I have no regrets.  I used Les each time.  He is a rare find in Duluth.  Good business.  PS.  My neighbor recommended him to me.

Five stars on Google review!

Theresa H.

August 2019

I just want to say thanks for the great work installing my new obscured window.  My old one wasn't even that old but the difference ...Wow!  Next step all new windows!!

Kudos to Dale and Rick on the great job.  Very nice guys & promptly on time :)  I would request them for my next windows.

Thanks for all - Mary you were great with all the updates.

Thanks so much,

Joy B.


I purchased gutters and a window, both installed quickly and correctly. Very good service and prices.

- Andrew

July 15th, 2019

Thank you!

We love the windows :)

The installers in all the installations did a great job & worked together as a team!

Thank you!

Dave & Diane S.

July 22nd, 2019

Thank you for the quality work as always!

Lee & Cathy

August 1, 2019




Kevin A.

September 20, 2019

Thanks to Ryan, Dale, Rick, & Matt!

I know how extremely busy everyone is getting things done to their home, when we can, with our short summer.  We have had the best luck with Les Grumdahl and Ryan.  He has always sent excellent workers to get the job done.  My wife was gone and she was worried about maybe we ordered the wrong windows.  I assured her we didn't.  When she came back from vacation she was thrilled with the windows.  Dale, Rick, and Matt were the best of the best.  Enjoyed watching them and visiting with them.  Cannot say enough of their workmanship.  Highly recommend this company.  Sometimes they may not get there when they say, but they never forget about you.

Thanks again......happy wife thanks to Dale, Rick, and Matt.

Ron B.

Silver Bay, MN

December 18, 2019


Thanks to Terry and crew for the excellent job of siding the back wall of our building.  It looks brand new!  I am looking forward to not having water leakage!

Peg A.