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May 1996 — May 2026

30 Years.
Same Family.
Same Mount Prospect Address.

Leaders Roofing Corp turns thirty in May 2026. Three decades of Chicagoland roofs, founded by Jan Koszyk in Mount Prospect, family-owned and operating from the same Illinois address ever since.

A letter from Jan Koszyk

To Chicagoland, with thanks

When I started Leaders Roofing in 1996, I had a truck, a license, and a phone number. The phone number is still the same. The truck has been replaced more times than I can count. The license number — Illinois Roofing Unlimited License #104.010248 — is the same one we were issued thirty years ago. Same number, same family, same Mount Prospect address.

Thirty years ago I didn't expect to spend three decades on Chicagoland roofs. I expected to do good work, treat customers the way I'd want to be treated, and see what happened. What happened is that the people I worked for in 1996 referred me to their neighbors, and their neighbors referred me to their neighbors, and that compounding of trust over thirty years has been the entire foundation of this business.

The roofs have changed. We don't install three-tab shingles anymore. We don't put down hot-mopped built-up roofing the way we did in the early years. We install cedar shake, natural slate, synthetic slate, copper flashing, designer architectural shingles, modified bitumen, TPO, and EPDM. We work with Historic Preservation Commissions and architectural review committees. We do multi-year capital plans for property managers with twenty buildings. The work has gotten more specialized.

What hasn't changed is the standard. Every roof gets the ventilation calculation. Every flashing detail gets the right metal — copper where copper belongs, never aluminum substituted to save money. Every estimate is written so the homeowner can see exactly what's in scope before any work begins. Every Polish-speaking customer who calls gets a Polish-speaking estimator, because Mówimy po polsku has been part of how we do business since 1996.

To the customers who trusted us in 1996 — and to the ones who trusted us last week — thank you. To the property managers who've worked with us across multiple buildings for ten and fifteen and twenty years — thank you. To the Polish families who came to us because we spoke their language and stayed with us because we did the work right — thank you. Three decades is a long time in any business. In a roofing business in northern Illinois, where every winter tries to disprove your warranty work, it's a particularly long time.

We're not going anywhere. The truck is still parked at the same Mount Prospect address. The phone still rings to the same number. The next thirty years start the same way the first thirty did — by answering the phone, walking the roof, and writing the proposal honestly.

— Jan Koszyk
Founder, Leaders Roofing Corp · 1996

Anniversary Offer · Limited to 30

30 Years, 30 Free Roof Health Checks

To celebrate thirty years, the first thirty homeowners and property managers to call in May 2026 receive a complimentary professional roof health check — same inspection, same documentation, same written report we provide on every paid assessment.

  • Full roof walk and visual assessment by a Leaders Roofing estimator
  • Photo documentation of any conditions found
  • Written report with prioritized recommendations
  • No obligation, no sales pressure, no charge

Mention "30 for 30" when you call. Inspection availability subject to scheduling. Available throughout our service area in Cook, DuPage, and Lake Counties.

The story

Three decades, decade by decade

From three-tab shingles in 1996 to cedar shake restoration on North Shore estate homes in 2026 — what thirty years of Chicagoland roofing actually looked like.

Decade One
1996 – 2006

The founding years

Jan Koszyk founded Leaders Roofing Corp in Mount Prospect in May of 1996. The first work was residential asphalt and built-up commercial — three-tab shingles were still standard, BUR (built-up roofing) was the dominant flat-roof system, and a roofing estimate was written by hand on carbon-copy forms. The company built its reputation in Mount Prospect, Arlington Heights, and the surrounding northwest suburbs the same way most lasting local businesses do: doing what was promised, showing up when the weather turned, and answering the phone when previous customers called back five years later. By the end of the decade Leaders Roofing was working steady residential and commercial across northwest Cook County and into Lake County.

Decade Two
2006 – 2016

The expansion decade

Architectural (dimensional) shingles displaced three-tab as the residential standard. TPO replaced BUR as the dominant new commercial flat-roof installation. Hailstorms in 2008, 2011, and 2013 drove a wave of insurance work across the entire Chicagoland region — Leaders Roofing did the storm-response work the right way, documenting damage carefully for adjusters, working directly with carriers, and refusing to chase storms out of state the way the storm-chaser companies did. Commercial maintenance contracts became a real line of business as property managers in the Mount Prospect / Elk Grove / Arlington Heights corridor recognized the value of structured preventive maintenance. The company added crews, expanded estimating capacity, and continued operating from the same Mount Prospect address.

Decade Three
2016 – 2026

The specification decade

The work shifted toward specification-driven projects — designer architectural shingles (GAF Camelot, CertainTeed Grand Manor), cedar shake restoration on Lake Forest and Highland Park estate homes, copper flashing resurgence on slate roofs in Kenilworth and Winnetka, synthetic slate (DaVinci, Brava, EcoStar) on retrofit projects, modified bitumen and TPO for the commercial corridor. Historic Preservation Commission and HOA architectural-review work became routine on North Shore projects. Multi-year capital planning became standard for property-manager portfolios. The company that started writing single-roof asphalt estimates in 1996 became the contractor specifying premium-material systems and navigating jurisdictional review on multi-month estate projects.

Milestones

Thirty years on a single page

  1. 1996 Jan Koszyk founds Leaders Roofing Corp in Mount Prospect, IL
  2. 2026 30 years. Same family. Same Mount Prospect address. Same license number. Continuing.
What hasn't changed

Standards that survived three decades

The license number

Illinois Roofing Unlimited License #104.010248 — issued in 1996, still active, still ours. Storm-chaser contractors come and go; the license number is one way to verify a contractor's actual tenure.

The phone number

(847) 312-2727 — same number that took the first call in 1996. The customer who hired us in 1998 can dial the same digits today and reach the same family business.

The address

Mount Prospect, Illinois. Same address since founding. We're not a franchise, not a regional rebrand, not an out-of-state operation that opened a Chicagoland office last year.

The standard

Every roof gets the ventilation calculation. Every flashing detail gets the right metal. Every estimate is written so the homeowner can see what's in scope. The standard is the standard.

The language

Mówimy po polsku. Polish-speaking estimators have been part of Leaders Roofing since 1996. The Polish-speaking community in Chicagoland has been part of how this business grew, and we've kept that capability available throughout.

The family

Founded by Jan Koszyk in 1996. Family-owned and family-run for thirty years. Same family stewardship as the company moves into its fourth decade.

Thank you, Chicagoland

To every homeowner who let us walk their roof. To every property manager who put us on a maintenance contract. To every Polish family who came to us because we spoke their language and stayed because we did the work right. To every customer who referred us to their neighbor. To every crew member who climbed onto a Mount Prospect roof in February or an Elk Grove warehouse in August. Thirty years didn't happen because we wanted them to. They happened because Chicagoland kept calling, and we kept showing up. Thank you.

— Leaders Roofing Corp · Mount Prospect, IL · Founded 1996 · IL #104.010248

Thirty years in. Get a free roof health check.

First thirty callers in May 2026 receive a complimentary professional roof inspection. No obligation, no charge, no sales pressure. Mention '30 for 30' when you call.

Request a Free Estimate Call (847) 312-2727