Late September is the last stretch of open-window weather in Northern Virginia before the heat comes on for the season. It is also when drafty, fogged, or sticking windows start to bother people again, which makes it a good time to decide whether yours can make it through another winter.
Should you replace your windows before winter in Northern Virginia?
Short answer: If your windows are drafty, fogged between the panes, rotting, or hard to open, now is a good time to start. Windows can be installed in cold weather one opening at a time, but ordering takes several weeks. Budget without a federal credit: the 25C tax credit does not apply to windows installed in 2026.
Below we cover the warning signs, materials, what the energy labels mean, installation options, and what to expect for cost. If you already know you are ready, our window and door replacement page explains how we work.
What are the signs your windows need replacing?
- Drafts you can feel around the sash on a windy day, even with the window locked.
- Fog or condensation between the panes. That means the seal on the insulated glass has failed, and it will not clear up.
- Soft or rotting wood at the sill or the bottom of the sash, common on older wood windows facing weather.
- Windows that stick, will not stay open, or will not lock, often from worn balances or warped frames.
- Traffic and neighborhood noise that comes straight through the glass.
- Single-pane glass or old aluminum frames, which you still find in some 1950s to 1970s homes around Vienna, McLean, and Fairfax.
One exception: condensation on the room side of the glass on a cold morning is usually a humidity issue, not a failed window. New windows have warmer inside glass, which helps, but a humidifier set too high will still fog them.
Which window and door materials make sense here?
Costs below are typical 2026 Northern Virginia ranges for an average double-hung window installed as an insert, not quotes.
| Material | Strengths | Trade-offs | Typical installed cost per window |
|---|---|---|---|
| Vinyl | Low maintenance, efficient, most budget friendly | Thicker frames, fewer color options, usually not paintable | $900 to $1,800 |
| Fiberglass | Strong and stable through temperature swings, slim frames, paintable | Costs more than vinyl | $1,300 to $2,600 |
| Composite | Wood fiber and resin blends that stay stable and look more like wood | Fewer brands to choose from | $1,300 to $2,600 |
| Wood or clad wood | Real wood inside, aluminum or vinyl cladding outside, traditional look | Interior wood needs finishing and upkeep, highest price | $1,600 to $3,200 or more |
Vinyl fits most budgets and most homes. Fiberglass and composite are a good step up for south and west walls that bake in summer sun. On the larger custom homes we work on around Great Falls, original wood windows from the 1980s and 1990s often have rotted sills, and owners usually choose clad wood or fiberglass to keep the look.
Entry doors
Steel doors are secure and affordable but can dent, and scratches near the bottom can rust. Fiberglass resists dents and moisture and can be stained to look like wood, which makes it a popular middle ground. Real wood is beautiful but needs refinishing, especially on doors that get afternoon sun.
What do ENERGY STAR, U-factor, and SHGC mean, and is there still a tax credit?
Every new window carries a National Fenestration Rating Council (NFRC) label with two numbers worth knowing:
- U-factor measures how fast heat escapes. Lower is better. An old single-pane window loses heat several times faster than a new ENERGY STAR unit.
- Solar heat gain coefficient (SHGC) measures how much of the sun’s heat comes through the glass, on a scale from 0 to 1. Lower blocks more heat.
ENERGY STAR sets limits by climate zone. Under Version 7.0, in effect since October 23, 2023, windows in the North-Central zone, which includes Northern Virginia, need a U-factor of 0.25 or lower and an SHGC of 0.40 or lower. That balance fits a place with both hot, humid summers and real winters. You can confirm your zone with the ENERGY STAR climate zone finder. ENERGY STAR estimates that replacing poor-performing windows with certified ones saves about 13 percent a year on energy costs on average, though results vary by house.
The federal 25C credit has ended
The energy efficient home improvement credit (section 25C) used to cover 30 percent of the cost of qualifying windows, up to $600, and up to $500 for exterior doors. Legislation passed in July 2025 ended it early, and the IRS confirms it is not allowed for property placed in service after December 31, 2025. What counts is when the windows are installed, not when you ordered or paid for them, so windows and doors installed in 2026 do not qualify.
Insert or full-frame replacement, and can it be done in cold weather?
An insert replacement fits a new window inside the existing frame. It is faster, less expensive, and leaves your interior trim and drywall alone, at the cost of slightly less glass. It works well when the existing frame is square, solid, and dry.
A full-frame replacement removes everything down to the rough opening. That lets us repair rot, insulate the gaps, and flash the window properly into the wall’s weather barrier. It costs more, typically several hundred to a thousand dollars or more per opening, and it is the right call when frames are rotting or when you are re-siding at the same time. If new siding is on your list, our comparison of fiber cement and vinyl siding explains why doing both together often makes sense.
Cold-weather installs
Yes, windows can be replaced in winter. We work one opening at a time, so each one is open to the outside only briefly while your heat stays on. Sealants and foams have minimum application temperatures, so on the coldest or wettest days we use cold-weather products or reschedule. Lead-safe containment in older homes adds setup time but works in any season.
What about lead paint, HOAs, and permits?
Lead-safe rules for pre-1978 homes
Much of the housing in Vienna, McLean, and Fairfax was built before 1978, when lead paint was banned for homes. Under EPA’s Renovation, Repair and Painting (RRP) rule, any contractor paid to disturb paint in those homes must be a certified firm using certified renovators and lead-safe work practices. Window replacement never qualifies for the rule’s small-job exemption. Expect plastic containment, restrictions on high-dust methods, careful cleanup with a cleaning check, and the EPA’s Renovate Right pamphlet before work starts.
HOA approval
Many Northern Virginia HOAs review changes to window frame color, grille pattern, material, and door style. Get written approval before ordering, because custom windows usually cannot be returned.
Permits
Fairfax County does not require a building permit for direct replacement of existing windows and doors in a home. New openings, larger openings, or changes to the framing do need one. Bedroom windows that serve as emergency exits should not get smaller, and glass near doors and tubs must be safety glass. Incorporated towns, independent cities, and historic districts can have their own rules, so check before you order.
How much do replacement windows cost in 2026?
For a national benchmark, Remodeling magazine’s 2025 Cost vs. Value report priced replacing ten 3 by 5 foot windows at about $22,000 for vinyl and $26,800 for wood. The same report put a steel entry door at about $2,400 and a high-end fiberglass “grand entrance” at about $11,750. Northern Virginia jobs often run higher. In our market, plan on roughly $2,000 to $4,500 installed for a steel entry door, $3,000 to $8,000 for fiberglass, and more with sidelights, transoms, or decorative glass.
What moves the price:
- Window size and style. Casements, bays, and bows cost more than double-hungs.
- Insert versus full-frame, and how much rot repair the openings need.
- Exterior colors, grilles, and specialty glass.
- Second-story access, lead-safe work, and exterior trim capping.
- How many windows you do at once. Whole-house projects cost less per window.
If a bigger project is coming, plan the windows with it. A roof replacement or an addition (see our guide to adding on versus moving) is a good time to make sure everything matches.
How we help with windows and doors
We start by checking each opening for rot, air leaks, and lead paint concerns, then recommend insert or full-frame window by window rather than one approach for the whole house. We handle HOA submittals when needed and schedule installs around the weather so your home stays warm.
Replacement window FAQs
How long does it take to replace the windows in a house?
Installing inserts in a typical house usually takes one to three days, and full-frame work takes longer. The bigger wait is manufacturing. Most windows take several weeks to arrive after the order is placed, and custom colors or wood units can take longer. That is why late September is a good time to order if you want new windows before the coldest weeks.
Are new windows worth it for energy savings alone?
Usually not on energy savings alone. ENERGY STAR estimates average savings of about 13 percent a year when replacing poor-performing windows, so payback takes many years. Most homeowners replace windows for comfort, fewer drafts, less condensation, quieter rooms, easier operation, and an end to rotting sills. The energy savings are a welcome bonus on top of those.
Should I replace all my windows at once?
It is usually cheaper per window and keeps styles and colors consistent. If the budget does not allow it, start with the worst windows or one full side of the house, and choose a product line that will still be available later. Replacing a few windows at a time works, but matching grille patterns and frame colors years later can be harder.
Are triple-pane windows worth it in Northern Virginia?
For most homes here, a double-pane window can meet North-Central ENERGY STAR criteria, usually with argon fill and a second low-E coating on the room-side glass. Triple-pane units cost more and weigh more, and they make the most sense in colder climates or for homes near loud roads where noise reduction matters. We can price both so you can compare.
Can I replace windows myself in a pre-1978 home?
The EPA’s RRP rule generally does not cover homeowners working on the home they live in, unless they rent it out, run a child care business there, or are renovating to sell. The dust is just as hazardous either way, especially for young children, so EPA urges homeowners to follow lead-safe practices or hire a certified firm.
Tax, code, and cost information here reflects sources available as of September 2026 and is general guidance, not tax advice. Check with a tax professional and your local building office for your situation.
If your windows are fogging, sticking, or letting in the cold, there is still time to get new ones in before winter settles in. Request a free consultation or call 703-587-7762.
