How Much Does Window Replacement Cost in Montgomery County, MD? (2026)
Short answer: At Smart Home Improvement LLC, replacement windows start at about $680 per window, installed. For comparison, published 2026 cost guides put most Maryland projects between roughly $475 and $1,250 per window, with many homeowners paying around $675 to $950.
Your exact price depends on the size, style and product line you choose, which is why we measure in person before we quote. Below is what moves the price, so you can read any estimate with confidence.
What drives the cost of replacement windows
Frame material. Vinyl is the most affordable and most common choice. Fiberglass, wood and composite frames cost more.
Window style and size. Standard double-hung windows are usually the least expensive. Bay, bow, casement, picture and oversized or custom-size windows cost more.
Glass package. Double-pane glass with Low-E coating is standard. Triple-pane, laminated or specialty glass adds cost but can improve comfort and noise control.
Product line. Brands offer good, better and best lines. We install Wincore and ProVia, which together cover budget-friendly through premium options.
Installation conditions. Second-story windows, rotted frames that need repair, or older homes with non-standard openings take more labor.
How many windows you replace. Larger projects usually bring the per-window price down.
Do I need a permit to replace windows in Montgomery County?
Usually not. Montgomery County's Department of Permitting Services lists replacing windows and doors as work that most likely does not need a permit, as long as you do not change the size of the opening or the net clear opening. Enlarging an opening, or adding a new window, is a different story. If you live in a city with its own rules, such as Rockville or Gaithersburg, or in an HOA, check with them too.
Common questions
How much does it cost to replace one window in Maryland?
At Smart Home Improvement LLC, replacement windows start at about $680 per window installed. Across Maryland, published 2026 guides put most installed windows between roughly $475 and $1,250, depending on size, style, material and installation conditions.
Is it cheaper to replace all my windows at once?
Usually, yes. Replacing several windows in one project tends to lower the per-window price because setup and labor are shared.
How long does window installation take?
For a typical home, installation is often done in one to two days once the windows arrive. Custom orders take time to manufacture, so plan ahead.
Which window brands do you install?
Smart Home Improvement LLC installs Wincore and ProVia windows and doors, so we can match the product to your budget and goals.
Get a free estimate
Smart Home Improvement LLC is a licensed Maryland home improvement contractor (MHIC #46217) based in Germantown. We measure, price and install replacement windows across Montgomery County. Call us for a free, no-pressure estimate.
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