WINDOW REPLACEMENT · POTOMAC, MD
Potomac, MD Window Replacement & Window Installation
Replacement windows for Potomac homes, installed by our own factory-trained crews. We have been doing this out of Woodbridge, Virginia since 1993, and every window we install carries a lifetime workmanship warranty.
What we find on Potomac windows
Potomac is large lots and large houses: Regent Park and the Potomac Falls estates from the 1960s, River Falls and Fox Hills from the late 1960s onward, Avenel from the mid-1980s, and a steady run of newer custom homes on two-acre lots. Window counts run high, sizes run large, and a lot of the 1960s and 1970s stock still has original wood windows.
What our crews expect on Potomac’s streets is wood frames that have taken decades of shade and moisture, fogged glass on large fixed and picture units, and homeowners who want slimmer frames and dark exterior colors, which is where fiberglass and clad wood earn their price over vinyl. Oversized and fixed picture units land above the typical per-window range.
We work in and around Avenel, Falconhurst, Potomac Falls, River Falls, Glen Hills and Potomac Village, and the service area covers 20854, 20859 and 20817 and beyond.
How to tell a window is actually done
Fog or condensation between the panes
Moisture trapped inside the glass unit means the seal has failed, and no amount of cleaning will fix it. The insulating gas is gone and the window is no longer doing its job.
Sashes that will not stay up, or fight you
When you need a stick to prop a window open, or two hands and a shoulder to close it, the balances or the frame have had it. It is also a safety issue: a bedroom window that will not open easily is an egress problem, not just an annoyance.
Soft or rotted wood at the sill
Press a thumbnail into the sill. If it gives, water is getting past the frame, and this is the one problem where waiting genuinely costs you, because every season adds carpentry to the job.
A draft you can feel with the window shut
On a windy day, hold the back of your hand near the frame. Air movement with the window closed and locked means the seals or the frame have given up.
What is NOT a reason on its own
A single cracked pane can often be reglazed. A house that just feels cold is frequently an attic insulation problem wearing a window costume. We will tell you that rather than sell you eighteen windows you did not need.
Do you repair windows in Potomac, or only replace them?
We replace. Sunshine Contracting is a full-replacement company: we do not take repair-only jobs, with one exception: warranty service for customers whose original installation was ours.
If only two or three of your windows are actually failing, we will say so. Plenty of our customers phase a house over a few years, starting with whichever elevation takes the weather, and come back for the rest.
Insert or full-frame: the decision that sets your price
This is the choice most homeowners are never told exists, and it is a major reason two quotes for the same house can be far apart.
An insert replacement leaves your existing frame in place and fits the new window inside it. It is quicker and costs less, and it is right when the existing frame is genuinely sound. The trade-off is glass area: you lose an inch or so around the perimeter.
A full-frame replacement goes back to the rough opening: frame, sill, trim. It costs more, and it is the only honest option when there is rot, when the opening is out of square, or when water has been getting past the frame.
We measure and tell you which one your house needs, opening by opening. If someone quotes a whole-house insert job without looking at your sills, that quote is worth a second opinion.
Ten window brands, one honest recommendation
We install windows from Simonton, Alside, Sunrise, Vytex, ProVia, Vanguard, Andersen, Marvin, Pella and JELD-WEN. Plenty of window companies sell just one brand (often their own house label), which means their recommendation was made before they ever saw your house.
Quality vinyl is the right answer for many Potomac homes: it insulates well and never needs paint. Fiberglass costs more and earns it when you want slimmer frames, dark exterior colors or maximum longevity. Wood with exterior cladding is what tends to go into older homes and architectural-review streets. See our vinyl windows and fiberglass windows pages for the details.
What window replacement costs in Potomac
Most of our window replacements run $600–$1,200 per window installed, with whole-house projects typically starting around $8,000. Most installers will not publish real window prices: we would rather you walk into every quote knowing what normal looks like. Our full replacement window cost guide breaks it down further.
- Frame material. Vinyl costs less than fiberglass or wood
- Insert versus full-frame installation: the biggest single swing
- Glass package: energy and laminated options move the number
- How many at once. Volume matters to the per-window price
- Frame condition. Rot around an opening turns an insert job into a full-frame job
The price we quote comes from measuring your actual openings, and it does not change at the kitchen table, no “today-only” pricing games. Financing is available with approved credit if you would rather spread it out. If you are after something specific (a single problem window, a bay or garden window, a historic requirement) reach out; we install far more options than one page can show.
If your Potomac community has architectural review
Potomac is Montgomery County permitting, and the county does not require a permit to replace windows in the same opening with the same clear opening size; changing the size of an opening does. Potomac has individually designated historic sites but no neighborhood-wide historic district. What does apply is the association: Avenel’s Modifications Committee must approve any exterior change, River Falls and the other planned communities have their own review, and older streets like Willerburn Acres have none. We identify what applies at your address and provide the product data sheets and manufacturer color names early. We work closely with the committees, we have a great relationship with plenty of HOAs in the area, and it has never been a problem for us.
What installation actually looks like
- We measure and inspect. Someone comes out, looks at every opening (sills included), and tells you what is failing and what has life left. You get a firm written price. No charge, no obligation, no pressure to decide on the spot.
- Your windows are custom-made. Windows are built to your openings, not pulled off a shelf, and typically arrive about 4–6 weeks after your signed contract and deposit. If your community has architectural review, this is where we hand you the product data sheets and manufacturer color names so the application goes in complete the first time.
- Installation, one window at a time. Most projects wrap up in a single day; larger whole-house jobs can run two or three. Either way, we remove and replace one window at a time, so your home is never left open overnight.
- Our own crews, start to finish. The people in your house work for Sunshine. They are factory trained and certified by the manufacturers whose windows they install, not a subcontracted crew assembled for the week.
Window questions from Potomac homeowners
How much does window replacement cost in Potomac?
Most installed replacement windows run $600–$1,200 each, with whole-house projects typically starting around $8,000. Frame material, insert versus full-frame installation, the glass package and how many you replace at once move the number. The estimate is free and the price does not change at the kitchen table.
Do I have to replace every window in my Potomac home at once?
No. Homeowners with big main-level glass often do that level first and come back for the bedrooms later. There is a modest per-window efficiency in doing them together, but we would rather you do half the house properly than all of it on a stretch.
Do you handle HOA and architectural approval in Potomac?
Potomac is Montgomery County permitting, and the county does not require a permit to replace windows in the same opening with the same clear opening size; changing the size of an opening does. Potomac has individually designated historic sites but no neighborhood-wide historic district. What does apply is the association: Avenel’s Modifications Committee must approve any exterior change, River Falls and the other planned communities have their own review, and older streets like Willerburn Acres have none. We identify what applies at your address and provide the product data sheets and manufacturer color names early.
What warranty comes with window installation in Potomac?
Our window and door installations carry a lifetime workmanship warranty. The glass and mechanical parts are covered by the manufacturer’s own warranty, which varies by brand and line: we show you the actual terms rather than summarizing them. Details on our warranties page.
Who actually installs my windows in Potomac?
Our own factory-trained crews: the same model we have run since 1993. No subcontractors. Manufacturer warranties assume the window went in exactly to specification, and subcontracted labor is where that assumption tends to fall apart.
Get a straight answer on your Potomac windows
Someone comes out, checks every opening honestly (including the ones that are fine), and leaves you a firm written price. Sometimes the answer is that three windows need replacing and the rest have years left. You get that in writing either way.
Fall Special: 15% off all exterior projects, including whole-house window replacement, on new contracts signed by November 20, 2026. Not combinable with other offers.
Send the form and we text you back within minutes, day or night.
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What every Sunshine window job in Potomac comes with
- Replacement, not repair. We replace windows. We do not take repair-only jobs, and if your windows have years left we will tell you so.
- Lifetime warranty, with workmanship covered in full. The installation is covered along with the window, not just the glass.
- Ten window brands, one honest recommendation. Because we are not a one-brand company, the window we suggest follows your house and budget, not our inventory.
- In-house, factory-trained crews on every job. No subcontractors. Family-owned, based in Woodbridge since 1993.
- 4.9 out of 5 from 999+ verified Guild Quality customers. BBB A+.
- Maryland MHIC license #05-131843 and Virginia Class A #2705075333. licensed and insured.
- Free estimate, firm written price. The number does not change at the kitchen table.
- Fast reply. Send the form and we text you back within minutes, day or night.