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Verified Reviews for Window Service pros in Cortland, IL
*The Angi rating for Window Service companies in Cortland, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.
*The HomeAdvisor rating for Window Service companies in Cortland, IL is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.
Last update on January 03, 2026
Find Window pros in Cortland

Windo-Well Cover Company
Windo-Well Cover Company
Windo-Well Cover Company, is committed to providing the highest form of customer service and customer satisfaction in the custom made window well cover industry. Please call for your personal consultation.
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Phyllis L on December 2019
Windo-Well Cover Company, is committed to providing the highest form of customer service and customer satisfaction in the custom made window well cover industry. Please call for your personal consultation.
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Phyllis L on December 2019

Window Concepts
Window Concepts
Window Concepts, Inc. has been a family-owned staple of the Chicago Suburbs since 1982. With over 43 years of local history, we provide homeowners with a dedicated focus on professional window installation. While windows are our primary specialty, our team maintains the expertise and skills to handle full-service roofing, siding, and door projects as secondary exterior solutions. We are a team of career installers, not a manufacturer. This allows us to offer an objective selection of products specifically suited for the Illinois climate, including high-durability Vinyl, custom-crafted Wood, weather-resistant Fiberglass, and specialized Egress window solutions. As an Angi Approved PRO and A+ BBB Accredited business, we rely on our decades of local service and precision-focused installation to ensure every home we touch is secure and energy-efficient.
"Our home is 85 years old and was in need of extensive renovations. We chose Window Concepts for our windows, roofing, and siding, and they did an outstanding job! Garrett provided a wide range of samples and made the entire process smooth and convenient. My wife and I highly recommend this family-owned company—they truly stand out! Their customer service is also exceptional and very accessible; 10/10 experience!"
Sean G on November 2024
Window Concepts, Inc. has been a family-owned staple of the Chicago Suburbs since 1982. With over 43 years of local history, we provide homeowners with a dedicated focus on professional window installation. While windows are our primary specialty, our team maintains the expertise and skills to handle full-service roofing, siding, and door projects as secondary exterior solutions. We are a team of career installers, not a manufacturer. This allows us to offer an objective selection of products specifically suited for the Illinois climate, including high-durability Vinyl, custom-crafted Wood, weather-resistant Fiberglass, and specialized Egress window solutions. As an Angi Approved PRO and A+ BBB Accredited business, we rely on our decades of local service and precision-focused installation to ensure every home we touch is secure and energy-efficient.
"Our home is 85 years old and was in need of extensive renovations. We chose Window Concepts for our windows, roofing, and siding, and they did an outstanding job! Garrett provided a wide range of samples and made the entire process smooth and convenient. My wife and I highly recommend this family-owned company—they truly stand out! Their customer service is also exceptional and very accessible; 10/10 experience!"
Sean G on November 2024

J&K Home Improvement & Restoration
J&K Home Improvement & Restoration
Founded in 1996, J & K has held quality workmanship at its core from the very beginning. We started as a exterior restoration company with 5 employees. We were small, but we knew that if we worked hard and stayed true to our quality we would be successful in the long run. In 2005, responding to huge demand, we started working as a General Contractor. The dedication to quality, strong work ethic and great customer service continued to be our hallmark. Over the years we have grown and learned to never forget the ethics that have guided us. Today we find the marketplace more competitive than ever before. The rapidly rising cost of materials, fuel and labor make surviving in our industry more and more difficult. Unfortunately the result is a high failure rate of businesses in our market. J & K Home Improvement offers the highest quality materials available and backs our workmanship with a ten year limited warranty.
"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!"
Stephen B on December 2022
Founded in 1996, J & K has held quality workmanship at its core from the very beginning. We started as a exterior restoration company with 5 employees. We were small, but we knew that if we worked hard and stayed true to our quality we would be successful in the long run. In 2005, responding to huge demand, we started working as a General Contractor. The dedication to quality, strong work ethic and great customer service continued to be our hallmark. Over the years we have grown and learned to never forget the ethics that have guided us. Today we find the marketplace more competitive than ever before. The rapidly rising cost of materials, fuel and labor make surviving in our industry more and more difficult. Unfortunately the result is a high failure rate of businesses in our market. J & K Home Improvement offers the highest quality materials available and backs our workmanship with a ten year limited warranty.
"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!"
Stephen B on December 2022

Renewal by Andersen
Renewal by Andersen
Replacement Window Installation, Replacement Patio Door Installation, Replacement Entry Door Installation
"So far so good"
Tyler H on December 2025
Replacement Window Installation, Replacement Patio Door Installation, Replacement Entry Door Installation
"So far so good"
Tyler H on December 2025

Best Solutions Basement Repairs & Waterproofing
Best Solutions Basement Repairs & Waterproofing
We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.
We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.
Sears Home Improvement - Doors and Windows
Sears Home Improvement - Doors and Windows
Transform Home Improvements has been helping homeowners turn their improvement dreams into reality for more than 20 years. We provide a complete siding solution, from selecting and ordering materials to installation and beyond with expert, dedicated support every step of the way. Our vinyl siding features weather resistant, easy-maintenance wood grain texture panels, and comes in a variety of colors. Offering robust financing options* and a full catalog of selections to meet every budget, schedule your no-obligation in-home consult to see just how affordable new, high-quality siding can be. Every project comes with our satisfaction guarantee and applicable multi-year warranties. Make this your easiest improvement project yet with Transform Home Improvements. *Restrictions may apply.
"Salesman's lied about project"
Eric B on August 2025
Transform Home Improvements has been helping homeowners turn their improvement dreams into reality for more than 20 years. We provide a complete siding solution, from selecting and ordering materials to installation and beyond with expert, dedicated support every step of the way. Our vinyl siding features weather resistant, easy-maintenance wood grain texture panels, and comes in a variety of colors. Offering robust financing options* and a full catalog of selections to meet every budget, schedule your no-obligation in-home consult to see just how affordable new, high-quality siding can be. Every project comes with our satisfaction guarantee and applicable multi-year warranties. Make this your easiest improvement project yet with Transform Home Improvements. *Restrictions may apply.
"Salesman's lied about project"
Eric B on August 2025

Sears Home Improvements - Windows
Sears Home Improvements - Windows
Transform Home Improvements has been helping homeowners turn their improvement dreams into reality for more than 20 years. We provide a complete window solution, from selecting and ordering materials to installation and beyond with expert, dedicated support every step of the way. Our wide selection of vinyl replacement windows come in a variety of styles, including double-hung, casement, sliding, bay and more. Choose from multiple grades of high-quality, all Energy Star® rated window options to find what suits your budget. With low monthly payments, instant credit, and financing options available, schedule your no-obligation in-home consult to see just how affordable new windows can be. Every project comes with our satisfaction guarantee and applicable multi-year warranties. Make this your easiest improvement project yet with Transform Home Improvements. *Restrictions may apply.
"Responsive and did a good job"
Toby K on June 2024
Transform Home Improvements has been helping homeowners turn their improvement dreams into reality for more than 20 years. We provide a complete window solution, from selecting and ordering materials to installation and beyond with expert, dedicated support every step of the way. Our wide selection of vinyl replacement windows come in a variety of styles, including double-hung, casement, sliding, bay and more. Choose from multiple grades of high-quality, all Energy Star® rated window options to find what suits your budget. With low monthly payments, instant credit, and financing options available, schedule your no-obligation in-home consult to see just how affordable new windows can be. Every project comes with our satisfaction guarantee and applicable multi-year warranties. Make this your easiest improvement project yet with Transform Home Improvements. *Restrictions may apply.
"Responsive and did a good job"
Toby K on June 2024

WindowWorks Chicago
WindowWorks Chicago
Window Works is the best choice for all of your replacement window needs. From energy efficiency to beauty and durability, our products are made to last and improve the look and value of your home. Our glass systems can help reduce fading of carpets, drapes and furniture, all while keeping you comfortable inside no matter the weather. From traditional double-hung windows to fancy bow & bay windows and even sliding patio doors, Window Works is your one stop shop for window replacement. Our products are made in America and come with exceptional warranties. With over 21 years' experience, we can do it all. We take pride in our highly trained, experienced, expert installation teams and our knowledgeable and friendly staff. Call us today! We look forward to working with you!
Window Works is the best choice for all of your replacement window needs. From energy efficiency to beauty and durability, our products are made to last and improve the look and value of your home. Our glass systems can help reduce fading of carpets, drapes and furniture, all while keeping you comfortable inside no matter the weather. From traditional double-hung windows to fancy bow & bay windows and even sliding patio doors, Window Works is your one stop shop for window replacement. Our products are made in America and come with exceptional warranties. With over 21 years' experience, we can do it all. We take pride in our highly trained, experienced, expert installation teams and our knowledgeable and friendly staff. Call us today! We look forward to working with you!

Jack's Roofing & Siding, LLC
Jack's Roofing & Siding, LLC
We are a locally owned and operated company that values honesty and integrity and treats your home improvement project as if it were our own. We offer a wide range of roofing expertise and experience to meet the specific needs of our clients. We specialize in a variety of roofing, to include asphalt shingle, traditional tile, natural slate, flat, foam, or single-ply. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction!
We are a locally owned and operated company that values honesty and integrity and treats your home improvement project as if it were our own. We offer a wide range of roofing expertise and experience to meet the specific needs of our clients. We specialize in a variety of roofing, to include asphalt shingle, traditional tile, natural slate, flat, foam, or single-ply. We pride ourselves on the quality of our work as well as our commitment to outstanding results. We look forward to building lasting relationships and guarantee your satisfaction!

Klock Home Services
Klock Home Services
Hi, I’m Kevin with Klock Home Services, proudly serving the Fox Valley area. I provide reliable, detail-oriented handyman and home repair services at fair prices. From furniture and drywall repair to minor carpentry, fixture installs, and general maintenance, I treat every project like it’s in my own home. Whether it’s a small fix or a larger task, you can count on quality work done right the first time.
Hi, I’m Kevin with Klock Home Services, proudly serving the Fox Valley area. I provide reliable, detail-oriented handyman and home repair services at fair prices. From furniture and drywall repair to minor carpentry, fixture installs, and general maintenance, I treat every project like it’s in my own home. Whether it’s a small fix or a larger task, you can count on quality work done right the first time.
The Cortland, IL homeowners’ guide to window services
From average costs to expert advice, get all the answers you need to get your job done.

Learn how much triple-pane windows cost, exploring common cost factors such as their size, type, location in your home, and design.

Dealing with a damaged window frame? Learn how much window frame replacement costs and what factors have an impact on your total.

If you're hoping to add a touch of timeless style to your windows, take a look at the cost of stained glass windows and what affects installation costs.

Adding a bay window brings many perks, like more light and increased home value. But there are some drawbacks to consider before starting this project.

Don’t let a window leak rain on your parade. Check out these nine simple tips to track them down and stop the damage before it gets out of hand.
•Discover the cost to replace window locks. Learn about price factors, labor rates, and tips to save on your window lock replacement project.
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