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About Cornerstone Exteriors Design

Hi, I'm Marshall McKinney. I've spent over a decade in the home improvement industry, and along the way I saw something that bothered me — the way windows get sold to homeowners.

The problem with how windows are sold today

If you’ve ever invited a window company into your home for a “free quote,” you probably know the script. They show up at 6 PM. They sit at your kitchen table for three or four hours. They pull out a glossy binder. They pitch you the “premium package.” Then comes the price — sky-high. Then comes the manager phone call. Then comes the “if you sign tonight” discount. Then comes another discount. And another.

By the end of the night, the original price has dropped by 40% and you’re exhausted, confused, and not sure if you got a fair deal — or just got worn down.

That’s not how it should work.

A better way

I started Cornerstone Exteriors because I believe homeowners deserve a simple, honest experience when they’re investing in their home.

That means:

  • Real pricing online, before you ever talk to us. Build your estimate yourself. Take your time. Compare. There’s no obligation, no email wall, no salesperson hovering.
  • A real installer at your in-home appointment — not a closer. When we come out to measure, you’re talking to someone who actually does the work, not someone whose paycheck depends on whether you sign that night.
  • One fair price. No theatrics. No fake discounts. No manager call-ins. Just the number, what’s included, and what to expect.

That’s the company. That’s the promise.

What we do

We install high-quality vinyl windows, siding, and doors for homeowners across the Denver metro area. We’re focused on doing one thing well before we expand into other markets.

If that sounds like the kind of company you want to work with, Start Your Estimate Here.