Illinois Energy Windows & Siding

What Illinois Energy Windows & Siding does

Illinois Energy Windows & Siding, Inc. is a privately held residential exterior remodeling company headquartered in Lisle, Illinois, founded in 2002. It serves homeowners across the Chicagoland and Northern Illinois market, selling and installing replacement windows, entry and patio doors, vinyl and insulated siding, roofing, gutters, soffits, and fascia. Its proprietary window line, marketed as SmartGlass365, and its branded door line, CastleView, sit alongside specialty siding SKUs (Cedar Lock, vertical) and complementary products such as GreenGuard house wrap, positioning the company as a single-source exterior remodeler rather than a single-category installer.

The company's business model is direct-to-consumer: lead generation funnels prospects into in-home consultations and visits to its Lisle showroom, after which quote-based proposals are issued. There is no published price list; revenue is generated per project, with average tickets implied to be in the mid-to-high four-figure range based on the remodeling scope (full window replacements, siding, and roofing). Revenue is supplemented by consumer financing, including a promotional "no interest until Fall 2027" offer that lowers purchase friction on high-ticket jobs. The company emphasizes in-house (non-subcontracted) installation crews and a True Lifetime Warranty on parts and labor, which doubles as a competitive differentiator and a post-sale service retention mechanism.

Operationally, the company self-describes as "one of Northern Illinois's largest remodeling companies," with cumulative metrics of roughly 100,000+ windows installed and $15M+ in customer energy savings. Reputation is a primary acquisition channel: 2,645 customer reviews at 4.74/5, a separate 4.9/5 rating across 1,100+ reviews, a BBB A+ rating, ENERGY STAR partnership, NARI membership, and Angi Super Service Awards (2020–2022) and Best of HomeAdvisor (2020). Headcount, revenue, ownership structure, and leadership names are not publicly disclosed.

Name

Illinois Energy Windows & Siding

Legal name

Illinois Energy Windows & Siding, Inc.

Website

https://illinoisenergy.com

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

51–100 employees

Short description

Illinois Energy Windows & Siding is a privately held, Lisle, Illinois–based residential exterior remodeler serving Chicagoland and Northern Illinois homeowners with replacement windows (including its proprietary SmartGlass365 line), doors, siding, roofing, gutters, and soffits, sold direct-to-consumer via in-home consultations and installed by in-house crews.

Ownership category

akta.pro rank

Headquarters

HQ city

Lisle

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Others

Revenue model

1. Windows, Doors, Siding, and Roofing Installation: One-time product sales combined with professional installation services for replacement windows, exterior doors, siding, roofing, gutters, and related exterior remodeling products. Revenue is project-based with each job generating one-time installation fees plus product costs.
2. Extended Warranty Services: Company provides True Lifetime Warranty coverage on parts and labor, representing ongoing service commitment. Warranty is included with purchase but generates long-term service obligations.
3. Financing Services: Company partners with financing providers to offer payment plans to customers, potentially earning referral fees or commissions on financing arrangements.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Illinois Energy Windows & Siding sells and installs energy-efficient replacement windows (featuring proprietary SmartGlass365 low-E glass), exterior door systems (CastleView entry doors, patio, French, and atrium doors), siding (vinyl, insulated vinyl, Cedar Lock, and vertical), residential roofing, seamless gutters, soffits/fascia, and GreenGuard house wrap for Chicagoland homeowners. Each project is delivered as a turnkey installation service performed by in-house factory-trained installers, packaged with a True Lifetime Warranty on parts and labor.

Product overview

Illinois Energy Windows & Siding is a home exterior remodeling company serving Chicagoland since 2002, offering a unified portfolio of replacement windows (featuring proprietary SmartGlass365 technology), exterior doors (CastleView entry doors, patio doors, French doors, atrium doors), siding (vinyl, insulated vinyl, Cedar Lock, vertical), and complementary products including roofing, gutters, soffits/fascia, and house wrap. The company positions itself around energy efficiency, offering ENERGY STAR-qualified products backed by True Lifetime Warranties on parts and labor. Their offerings are integrated around the Chicagoland climate, emphasizing energy savings of 20-40% on heating and cooling bills. The product ecosystem includes factory-certified installation, GreenGuard house wrap for weather protection, and Worthington windows/patio doors as key branded components alongside their proprietary CastleView door systems and Cedar Ridge siding. All products are supported by in-house installers and comprehensive warranty coverage.

Differentiator

Problem solved

Functional benefit

Brands

• CastleView: High-performance fiberglass door entry systems with R-15 insulating value, featuring stile and rail detail, polyurethane core, and weatherstrip technology.
• SmartGlass365

Products and services

• Replacement Windows Energy-efficient replacement windows in multiple styles (awning, bay, bow, casement, double-hung, garden, hopper, picture, slider) built with SmartGlass365 low-E insulated glass and meeting ENERGY STAR standards; sold and installed for Chicagoland homeowners.
• SmartGlass365 Windows Premium low-E insulated glass technology that blocks UV rays, reduces heat transfer, and dries 99% free of water spots, providing year-round energy savings and comfort for Chicagoland homeowners.
• CastleView Entry Doors High-performance fiberglass entry doors with R-15 insulating value (5x better than wood), featuring polyurethane cores, perimeter foam-filled weatherstrip, internal lock blocking, and custom woodgrain or paint finishes.
• Patio Doors Worthington sliding patio doors available in 5-foot to 12-foot lengths, offered in vinyl or aluminum-clad wood with various hardware options and color choices.
• French Doors Classic elegant French doors with modern energy-efficient performance, security features, and low maintenance requirements.
• Atrium Doors French door-style entry doors where only one panel is operable, featuring sliding exterior screens and available in various sizes, colors, and styles.
• Vinyl Siding Cost-effective vinyl siding known for outstanding customization, high energy efficiency, and low maintenance without painting or sanding requirements.
• Insulated Vinyl Siding Enhanced vinyl siding with expanded insulation layer providing additional protection, improved energy efficiency, noise reduction, and comfort for Chicagoland homes, reducing heating and cooling costs by 20-40%.
• Cedar Lock Siding Cedar-style siding offering natural material aesthetics with greater durability and lower maintenance requirements than real cedar.
• Vertical Siding Distinctive vertical siding options ranging from budget-friendly vinyl to premium cedar composite, customizable with dozens of colors, textures, and finishes.
• Soffits and Fascia Stealth Vent Soffit System maximizing airflow while protecting homes from moisture damage, pest infestations, and mold with virtually maintenance-free materials.
• Gutter Systems Seamless gutters with impact-resistant cold-weather performance, available in oversized configurations with downspouts for efficient water drainage.
• Residential Roofing Residential roofing services including new roof installations and replacements, using premium materials with extended warranty coverage for Chicagoland homes.
• True Lifetime Warranty Service Comprehensive lifetime parts, labor, and service warranty covering Worthington windows, Cedar Ridge siding, and CastleView doors with product-specific coverage terms, representing an ongoing service commitment paired with each installation project.

Quantifiable outcome

• 20-40% reduction in heating and cooling bills
• +3 more outcomes

Named customers8 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eleven partnerships are on record, tiered core and minor.

• ENERGY STARcoreStrategic or Co-development PartnerCompany is an ENERGY STAR Partner, with products meeting or exceeding ENERGY STAR standards. Their SmartGlass365 windows are specifically designed to qualify for ENERGY STAR certification, helping customers save on energy costs while meeting environmental standards.
• National Fenestration Rating Council (NFRC)coreTechnology or IntegrationCompany is a member of NFRC, which provides third-party certification of window energy performance on an independent basis. This certification provides customers with verified energy performance data.
• National Association of The Remodeling Industry (NARI)coreStrategic or Co-development PartnerMember of both Chicagoland and National NARI organizations, demonstrating commitment to industry standards and professional remodeling practices.
• Better Business Bureau (BBB)coreStrategic or Co-development PartnerBBB Accredited Business with A+ rating and Complaint-Free Award recipient. Company maintains accreditation as part of their commitment to customer satisfaction.
• CastleView Door Entry SystemscoreOEM/ Whitelabel/ Licensing PartnerCompany is a factory-certified installer of CastleView Door Entry Systems, a proprietary door brand. They offer exclusive CastleView door products as their premium entry door solution with special warranty coverage.
• Worthington WindowscoreTechnology or IntegrationCompany installs Worthington Windows, a trusted manufacturer. Worthington patio doors are specifically highlighted as extremely well-constructed products that share the company's commitment to quality.
• Cedar RidgecoreTechnology or IntegrationCompany installs Cedar Ridge Insulated Siding as a premium siding option. Cedar Ridge products come with True Lifetime Warranty coverage.
• Naperville Chamber of CommerceminorGTM or Marketing PartnerCompany is a member of the Naperville Chamber of Commerce, celebrating 10 years of membership. Provides networking and community engagement opportunities.
• KidsMatterminorStrategic or Co-development PartnerCommunity partnership with KidsMatter, a youth empowerment organization. Company has sponsored KidsMatter's Annual Job Fair for two years and Youth Service Awards for three years, supporting local youth and families.
• Habitat for Humanity RestoreminorGTM or Marketing PartnerCompany was the top donor for Habitat for Humanity Restore in 2013, supporting community housing initiatives.
• Make-A-Wish FoundationminorGTM or Marketing PartnerCompany partners with Make-A-Wish Foundation as part of their community outreach and charitable giving program.

Scale indicators6 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• Window World: Largest U.S. window and exterior remodeling franchise with low-cost product bundles and direct-to-consumer sales; competes head-to-head with Illinois Energy's window, door, and siding offerings in many metros.
• Feldco: Chicago-based exterior remodeling company serving the Midwest with windows, siding, doors, and roofing; directly comparable given overlapping Chicagoland/Midwest service territory and similar product portfolio.
• Pella Windows & Doors: National window and door manufacturer with showrooms and professional installation services; competes with Illinois Energy on premium window/door replacements with similar in-home consultation and warranty offerings.
• Marvin Windows and Doors: Premium window and door manufacturer with a network of certified installers; comparable to Illinois Energy on high-end window/door sales with built-in installation service.
• Renewal by Andersen: National window and door replacement franchise with in-home consultation and installation model, directly competing with Illinois Energy on premium replacement windows and doors in the residential market.
• Power Home Remodeling: Large multi-region exterior remodeling company offering windows, siding, roofing, doors, and gutters with in-house sales and installation crews; highly comparable to Illinois Energy's service scope and operating model.
• Champion Windows: Direct-to-consumer manufacturer/installer of replacement windows, siding, roofing, and sun rooms; mirrors Illinois Energy's bundled exterior remodel product lineup and in-home sales motion.

Regional players

• Great Lakes Window: Midwest-focused window manufacturer supplying products through regional dealers and contractors; relevant peer as an upstream supplier/competitor in the same Midwest replacement window market.

Broad incumbents

• Lowe's Installation Services: National home improvement retailer offering installed-sales programs for windows, doors, roofing, and gutters; competes with Illinois Energy but as a channel rather than a focused exterior remodeler.
• Home Depot Installation Services: National home improvement retailer connecting homeowners to window, door, siding, and roofing installers; competes with Illinois Energy on lead generation and installed sales but as part of a broader home improvement offering.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Customer concentration

• Facebookfacebook.com/illinoisenergywindowsandsiding
• Instagraminstagram.com/illinoisenergy
• LinkedInlinkedin.com/company/illinois-energy-windows-and-siding

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Illinois Energy Windows & Siding