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TRUSTED BY CORTLAND, IL HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon175
    Verified roofing services reviews

Top-Rated Roofers in Cortland - Updated Nov 2026

Avatar for Guardian Roofing Systems, LLC
Guardian Roofing Systems, LLC
4.9(
70
)
Flat, Foam or Single Ply Roofing - RepairFlat, Foam or Single Ply Roofing - Repair- For Business

Serving Cortland, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2010

Free estimates

Emergency services offered

"Both the owner of Guardian Roofing Systems, LLC, Angelo Ristich and his Lead Repairman Hector were professional and very knowledgeable about the task at hand and what needed to be done. They answered my questions and made sure I had full understanding of the whys of the roof replacement. I was quoted a fair price. The job was completed in a timely manner and true to their word, when the next heavy rain high windstorm happened the new roof held up beautifully. The leaks my house was plagued with aren't a problem anymore. For quality service at a fair price I definitely recommend them."
roof coating
new roof installation
decking
insulation
base sheet

+13

Response time2 days
Response rate91%
81 neighbors recently requested a quote
Avatar for Home Genius Exteriors
Home Genius Exteriors
4.9(
388
)
Asphalt Shingle Roofing - Install or Replace

Serving Cortland, IL and surrounding areas

Approved

In business since 2004

Free estimates

Emergency services offered

Elevate your home with Home Genius Exteriors, setting the standard by offering full-service solutions for roofing, siding, windows, doors, gutters and insulation. We support our veterans and communities by supporting local and national charitable organizations through our Home Genius Cares initiative. With an Owens Corning® Platinum Preferred designation, we also offer flexible payment options, industry leading warranties and a wide range of premium products tailored for your home. It?s time for a different experience, entrust your next home project to a genius and schedule your free inspection today!

Asphalt Roofing
Asphalt Roofing
Asphalt Roofing
Asphalt Roofing
Asphalt Roofing

+76

Recommended by96%of homeowners
Avatar for J&K Home Improvement & Restoration
J&K Home Improvement & Restoration
4.6(
9
)
Asphalt Shingle Roofing - Install or ReplaceAsphalt Shingle Roofing - Install or Replace - For BusinessFlat, Foam, or Single Ply Roofing - Install or Replace+5 more

Serving Cortland, IL and surrounding areas

Approved

In business since 2005

Free estimates

Credit card accepted

"Simply put, you will NOT find a better, more honest, more helpful, more easy-to-work-with, reasonably priced contractor than John Lee and his crew at J & K Home Improvement & Restoration! We had a "complicated" set of circumstances when our home was damaged by a storm, last winter. The insurance company sent out an estimator to assess the damage and, after the company recommended J & K Home Improvement & Restoration, I was introduced to John Lee. I eventually learned that John also does estimates for a variety of insurance companies (because his company is so well regarded), and he patiently listened as I described the nuances associated with our house. During our initial consultation, he was able to clearly describe all of the steps that would be necessary and answer all of our questions. Long story short, not only was John able to address EVERY single concern and request that we had regarding the eventual repairs to the house (including roof, siding, and a window upgrade that would have cost much more if we had done it at a later time), but he spent plenty of extra time making sure that everything we had talked about was addressed to our 100% satisfaction! He was also able to persuade the insurance company to cover more complete repairs than was originally specified by the first adjuster! In addition, when we had an electrical "hiccup" associated with all the pounding on the walls, John quickly sent an expert electrician to locate and correct the problem. He absolutely could have passed those charges on to us because the failure wasn't due to any mistake on the part of his crew but, instead, he picked up the unanticipated expense himself. It was truly a pleasure to work with John! He made a difficult situation as easy to manage as possible, and we would strongly recommend J & K Home Improvement & Restoration to anyone who wants to hire a quality contractor that stands behind their work and well-earned reputation!"
 Roofing
 Siding Job
GAF Shingles
 Siding job site
 Modifed Bituman

+2

Recommended by100%of homeowners
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Roofing FAQs, answered by experts

Flapping shingles, or shingles that are lifting or curling away from your roof, can be glued back into place using roofing cement or sealant. Apply the glue underneath the shingle, then press it down firmly. You can leave a brick on top of the shingle to hold it in place overnight while the sealant dries.

You can only overlay a roof once. Any additional layers of shingles will add too much weight and may also violate building codes. Once your roof has had an overlay, you’ll need to have a full roof replacement, including a tear-off of all existing roofing materials, when it’s time for a new roof. 

Rain shouldn’t come in through your ridge vents unless your vents are damaged or the rain is accompanied by very high winds. Most ridge vents use flashing or baffling to keep out rain, snow, and debris. If your ridge vent isn’t baffled, rain is more likely to enter your attic, so ridge vents with baffles are a better choice in areas with regular rainfall.

While you can stay at home during a roof replacement, you probably won’t want to, as it’ll be very noisy. The area around your home will also be messy, as roofers will be discarding old roof material and storing their equipment on the ground.

You should avoid choosing a metal roof if your home has a weak structural support system, as metal roofs can be heavier than roofs made of other materials. If you're in a region prone to frequent hailstorms or high winds, you also need to be aware that denting may occur.

The Cortland, IL homeowners’ guide to roofing services

From average costs to expert advice, get all the answers you need to get your job done.