(815) 388-3561 genexmchenry@gmail.com

Roofing Contractors Johnsburg

Gen Ex Construction is the number one exterior home service in the Johnsburg, Illinois area!  Our roofing, siding, and gutter experts have been helping homeowners and commercial businesses for over 20 years!  When you choose to work with Gen Ex Construction you are choosing to work with a business that has:

4.7 Rating on Google 

5 Star Rating on Facebook 

A+ Rating with the BBB 

5 Star Rating with Guild Quality

If your home or business in Johnsburg Illinois needs roofing, siding, or gutter work, rely on the professionals you can trust, rely on the best, rely on General Exterior Construction.  Call now:

(815) 388-3561


Greg came out to my place to do a roof inspection. He was very thorough and advised us of all of our options, even including the option of waiting to replace our roof. You could tell he wasn’t just trying to sell a job, but provide honest options available. He even did a roof repair for free for us! He advised us on what to look for should future issues arise that may require attention and, most importantly to me, he advised on what not to lose sleepover. He was reassuring, telling us what to do to protect and maintain our home. He really took his time and even looked at additional exterior concerns (such as my gutters) that I had, again, answering all of my questions. I highly recommend them! The office staff was friendly and they maintained contact for scheduling and responded immediately, respecting my work schedule as well, which I appreciated !

Kaitlyn G.

We needed our garage roof replaced, and I can’t explain how happy we are with the results. Our roof looks amazing, and Paul and his crew fixed everything that was wrong with it or that was not done correctly the first time, which was before we purchased the house. Great job and I highly recommend them. They were prompt, professional, and did the job before we thought they could even fit us in. We will definitely use them again if we need them.

Tina R.

Roofing Repair & Replacment 

Roofing Inspections

Storm Damage Remediation 

Gutters & Soffit

Commercial Roofing Services

Welcome to General Exterior Construction.

We are a self-owned licensed, bonded, and insured roofing contractor located in McHenry, IL. Our company prides itself on its utmost professionalism delivered on each and every job. We go the extra mile to ensure that every step of your exterior project is completed correctly the first time.

Whether you need an upgrade, need repairs, or have storm damage our techs are always on hand to help you out whenever you need us.  We have the knowledge and the expertise to repair or install any roofing, siding, or gutter work for homes and businesses but also will work with your insurance company to make sure that you are well-taken care.  Our step-by-step process means that we will be beside you every step of the way so you know exactly what is being done. Our experience gives us the knowledge to tackle any residential job we take on. We follow strict safety and protocol guidelines ensuring the job is done right.

Gen-Ex works hand in hand with our customers so we can complete our job to the customer’s utmost satisfaction. To make sure every step of your roofing project is completed correctly Gen-Ex creates and follows extensive check list’s made specifically for your home leaving no stone unturned.

Our employees are highly trained clean-cut professionals working hard to support their families. Employees are identified w/ blue Gen-Ex T-shirts so you can be assured that everyone on your property works for our company. Gen-Ex is a Drug-Free Work Environment, making sure that our workers are at their best on every rooftop in this hazardous profession.

Roofing Repair & Replacement in Johnsburg

When it comes to your roof, getting things done right is incredibly important. You can rely on Gen-Ex Construction to be your residential roofing specialist. Whether your roof needs minor repairs or a total replacement Gen-Ex has the necessary tools and experience to provide superior results. A new or repaired roof adds value to your home and increases its curb appeal. A small leak or missing shingles might seem like a reasonable project to try on your own but you may miss something that will lead to a bigger (and more expensive) problem. In addition, there are safety risks in trying to repair or replace a roof yourself. Working on roofs and hauling materials up and down ladders is dangerous if you’re not experienced. We have the equipment to perform the job safely and efficiently.

There are specific things to look for when questioning if your roof needs repairs or a replacement.
If your roof is over 20 years old it’s most likely time for a replacement. Cracked or missing shingles as well as curled shingle edges are also signs that you should call us.  The Weather in the Johnsburg area is known to weaken materials which can be a leading cause of roof leaks, mold, and rot. Gen-Ex Construction values any roofing project, no matter how big or small. Our team of contractors and estimators will go the extra mile to ensure that your project is completed on time and on budget. Customer satisfaction is our #1 goal. We offer a 24-hour emergency hotline and a guarantee on all labor. Call us today at (815) 388-3561 to get your residential roofing project started.

Storm Damage Roofing Repair in Johnsburg

Nothing can ruin your day faster than having a leaking room during a heavy storm. Getting a leak fixed quickly is all about knowing the right people. At Gen Ex Construction we work hard to ensure that all issues are fixed and done right.

In addition to residential properties, we can service commercial and multi-structure properties and can help you with any roof that you need. It doesn’t matter if you’re a restaurant, retail store, or a mall, if you have a small building or a huge complex, we can help.

Contact Us

Gen Ex General Exterior Construction

McHenry, IL 60050

(815) 388-3561
Fax: (815) 648-1810

BBB Accredited

General Exterior Construction BBB Business Review



Normal Business Hours
Monday   8:00 AM – 5:00 PM
Tuesday   8:00 AM – 5:00 PM
Wednesday   8:00 AM – 5:00 PM
Thursday   8:00 AM – 5:00 PM
Friday   8:00 AM – 5:00 PM
Saturday   Closed
Sunday   Closed
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