Replacement windows and siding specialist serving Denver Metro. We are locally and family owned and operated with an A- BBB rating. Increase beauty and value of your home with quality Infinity from Marvin windows and James Hardie siding. We understand that when it comes to replacing your home windows, you want to make the best choice and trust that the company you hire to install your new windows will get the job done right, on time, and within your budget. At Lifetime Windows and Siding we pride ourselves in offering energy efficient, low maintenance, quality home improvement products to homeowners just like you in the Denver metro area. All of our replacement glass windows at Lifetime Windows and Siding, are custom made so that each window, door and piece of steel and vinyl siding will specifically fit your home. When you order new windows from Lifetime Windows and Siding you are making an investment in a standard of service that you can trust. From the day you make your first call for a consultation, through purchasing our products and services, to professional installation of your custom home windows and siding and all through the life of your product we make an effort for your convenience and peace of mind. All of our Lifetime glass windows, doors and siding come with the following guarantees: