Northern Illinois Waterproofing & Construction, Inc.

“Northern Illinois Waterproofing installed an egress window for us.”

Northern Illinois Waterproofing installed an egress window for us. They were professional and commutative! They managed everything and adapted to required and requested changes. They did the work with minimum disruption to the landscape. I would definitely recommend them!

Ed Murray

Jan 2026

“Owner Mark is very knowledgeable and professional.”

Owner Mark is very knowledgeable and professional. Provided waterproofing and insulation services in a timely manner; cost as quoted. Would highly recommend.

Madeline Barbera

Jan 2026

“These guys are amazing.”

These guys are amazing. They solved water issues in my previous home as well as my current one. They have performed many services: digging a trench at the old house, replacing a sump pump in the new one, cleaning and repairing window wells and installing covers, installing new basement windows, and sending a friend of theirs to replace a hose spigot. All work was done in a timely manner and to the utmost satisfaction. They are both personable as well as professional. I highly recommend them.

Susan Siciliano

Dec 2025

“I've had to do a bunch of work on my basement in the last few months, and the best experience I've...”

I've had to do a bunch of work on my basement in the last few months, and the best experience I've had has been with Mark and Northern IL waterproofing. We had basement windows replaced, foundation cracks repaired, window wells dug out and drains installed. If you're looking for a family business where they explain the work that needs to be done, follows through to the T, does excellent work, and is a pleasure to work with, look no further. Couldn't be happier!

B eN

Dec 2025

“Fantastic company.”

Fantastic company. They have addressed two issues at our property. Most recently, we had a failed sump pump on New Year's Eve. They came out and installed a new pump and backup in the evening. Very few businesses would make that effort, and they really saved the day. Friendly and great to work with.

Rob Schnieders

Jan 2025

“Water in a finished basement is always a homeowners nightmare.”

Water in a finished basement is always a homeowners nightmare. So with a break in the rain I hit the web and found this gem. I also spoke to a friend Who used the business and said they were fantastic. I called and spoke to Dawn and she made arrangements to get a crew to me the following day (today) , Dawn couldn’t have been kinder or more understanding This morning a crew showed at the agreed time. Mark , Matt and another gentleman. They got right to work and almost immediately located the monster foundation crack. It was an old one so they had a little more work to do. They treated my house like their own and were done in very reasonable amount of time even leaving me time to get other things done around the house. A huge thanks to all involved Great people , great work and a very fair price. If you need any work related to this field you’ve got to reach out to this great crew Thanks again ! Bob

Bob Cavaiani

Nov 2024

“Tldr: Quick, reliable, and honest.”

Tldr: Quick, reliable, and honest. I called to get some cracks in my unfinished basement checked since they were close to important stuff like the furnace, water heater, etc. They came by the end of the week, and looked at all my concerns. They were honest about which ones were superficial and which were actual concerns. They also were able to see my sump pump had a bad switch and I didn't have any drain boards! Nobody likes spending money, but I'd rather pay a professional who's going to do quality work who's going to get the job done right the first time. They were recommended by my neighbor who got seepage fixed, and they're worth every penny!

OperatorAV

Oct 2024

“Just fantastic! All it took was a quick call and sending some pictures to get a quote within hours...”

Just fantastic! All it took was a quick call and sending some pictures to get a quote within hours for a sump/battery backup replacement and several cracks filled. We did not hesitate to use them over other companies that came out for quotes because Dawn answered all our questions and we could tell they are a long standing business that knows what they are doing. Mark completed the work and it was so clean and detailed, we couldn't be happier. Thank you!

Mrs F

Jun 2024

“We are so pleased with the service we received from owner Mark Olsen and his team.”

We are so pleased with the service we received from owner Mark Olsen and his team. We just had our basement waterproofed with added drain tiles in several parts of our basement. One area needed a little additional attention and he came back to fix it no questions asked. We were recommended to Mark as doing great work at a honest price. We received exactly that! Thank you for your great service Mark and team! We will absolutely refer you to all our friends and family. Much Appreciation, Christina and Matt

Claire Grana

May 2023

“After many years I finally have a dry basement and so very greatful to Mark and his team.”

Mel Gleeson

May 2023

“Called Friday afternoon at 4:30pm was out Saturday morning.”

Called Friday afternoon at 4:30pm was out Saturday morning. Found that the company that did the work originally didn’t do the work correctly.Mark the owner of the of northern Illinois waterproofing repaired the leak in a few short hours. As I watched Mark explained everything he needed to do.

Warren Clarke

Mar 2023