We started Northline to give homeowners a better remodeling experience.
Contractor Mike Kowalski started Northline in 2007 with a simple goal: clear proposals, real schedules, and crews who clean up. Today we have transformed more than 2,900 homes across Western Pennsylvania.
Meet the team
The people behind Northline Siding & Windows.
Meet the team
The people behind Northline Siding & Windows.
Mike Kowalski
Founder
Mike reviews every proposal and visits every job during installation.
Install crews
Manufacturer-certified
Certified siding and window installers who work as one team.
Real schedules
A day-by-day plan for every multi-day install.
Energy savings
Insulated siding and Energy Star windows that lower your bills.
Lifetime labor warranty
We stand behind our installation for as long as you own your home.
Our promise
A beautiful, efficient exterior — installed on schedule and cleaned up every day.