Our Vinyl Max windows are rated on Energy Star's Most Efficient List of 2023. New windows improve energy efficiency and keep your home quiet. A variety of styles and custom features allow you to find a perfect fit for your home.

Common Questions

Are your windows Energy Star rated?

Our windows are not only Energy Star rated but meet the "Most Efficient Windows list of 2023" produced by Energy Star's yearly report.

What is the window order minimum?

There is a 5 window order minimum.

Do you install both vinyl and wood windows?

We offer both vinyl windows and wood windows, plus historic windows for those interested in custom orders.

Brown casement windows.
Energy Efficient custom half round windows.
Energy Efficient windows with traditional colonial grids.
Energy efficient windows with triple pane glass.
Energy Efficient windows with Low-E Argon. The Most Efficient windows of 2023.
Energy Efficient double hung window with mulled half-round.

Interested in Wood Windows?

We gladly offer custom wood windows by Trimline for historic or custom spec requirements.

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Window Features

20+ Window Styles

Single or double hung, slider, picture, casement and many more styles ensure a custom fit for your home.

Custom Grids

Grid patterns and profiles are available to best match your homes architectural style.

Color Options

Vinyl color options are available to further complement your window and home’s style.

Glass Packages

Specialized glass packages are available to meet your homes specific climate and budget needs.

Vinyl siding and vinyl windows.

Let's make your home energy efficient and beautiful.

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30+ Years’ Experience

Thousands of satisfied home owners across Maryland and DC.

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Lifetime Warranties

Highly certified with Atlas, GAF, Mastic, James Hardie & more.

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Value Focused

A family team proud to deliver excellence at a fair price.

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Trusted by local homeowners.

My husband and I met with Pat Jewell and he was such a pleasure to work with. Very knowledgeable and kind. We felt comfortable with this company.
We are very pleased with the work that Capitol Improvements did and we would highly recommend and use them again in the future.
Carlos, Yelp Reviews
They had the most competitive prices and did not try and upsell. Their teams are efficient, professional, very clean, and on time.
Veronica, Google Reviews
Seth and install team were organized and project went smoothly. Entire team was responsive and kept in touch throughout the process.
They replaced my roof including skylights in April 2023 and I am very satisfied. Melinda as my first contact was very professional and got me on the schedule quickly.
It was easy to work with Pat to get a quote. We did both a roof on our house and our shed, we also had new gutters put on our den. The crew was very hardworking and efficient.
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