Call us at (720)508-4385

Millennium Windows & Siding


Work directly with the owners

Why pay a salesperson's high commission? Our customers save on average 20% below their other bids.

Simonton is the Popular Choice in Vinyl Replacement Windows

Simonton is one of the largest manufacturers of replacement and new construction windows in the US. Specializing in vinyl windows, Simonton is recognized throughout the industry for producing quality windows at a mid-level price. That’s why Simonton has become a popular choice for many consumers seeking beautiful, durable, and reasonably-priced windows.

Simonton has been manufacturing windows to exacting standards since the 1940s. Today, Simonton vinyl replacement and new construction windows are available in several different styles.

picture window
arched windows
casement windows
replacement windows
garden window
patio doors

Andersen Wood Replacement Windows

Homeowners with older or historical homes often desire wooden replacement windows to maintain the integrity of their home’s original style. Millennium Windows and Siding offers Andersen windows to deliver a look compatible with these homes.

bay windows

Millennium Windows and Siding is your formula for success!

Quality windows plus the window installation expertise and experience of Millennium Windows & Siding is the formula for a window replacement home improvement project that rates great reviews from customers.

Get a free quote today!

Request A Quote
At Millennium Windows & Siding, you work directly with the owner eliminating the salesman's high commission.

Once a contract is signed and approved, Millennium Windows & Siding will not change the price of your project for any reason. There will never be any additional fees and/or costs added to your home project.

Denver Area? Call 720-943-7933

Colorado Springs? Call 719-225-1723

Our products are backed by our true 100% lifetime warranty* with no trip fee and no labor fee!

* Includes window frame, operators, seal and glass. Call (720)508-4385 for details.

An investment in new windows or siding from Millennium Windows & Siding will increase the value of your home, because our warranty transfers to new the homeowners when you sell.

Better Business Bureau Accredited Business
Google 5 star reviews
Angie's list
Yelp 5 star rating