Most double-hung window advice skips the part that actually costs you money: deciding between an insert and a full-frame replacement before you get quotes. Get that call wrong and you either overpay by $500 a window or install a new window into a frame that is already rotting. Everything below is organised around that decision.
Insert or full-frame? Settle this before you call anyone
An insert replacement drops a new window into your existing frame. Interior trim and exterior cladding stay put, the job takes about 90 minutes per opening, and it is the cheaper option by $200–$500 per window. It only works if the existing frame is sound and square.
A full-frame replacement strips everything back to the rough opening. It costs more and takes a contractor crew about a day and a half per window, but it is the only correct choice if the frame is compromised — and it is the only way to change the window size or fix a long-running water leak.
Check your frames yourself before anyone quotes you. Four things decide it:
- Probe the sill. Push an awl or a screwdriver into the wood at the bottom corners of the frame, inside and out. If it sinks in, the frame is rotten and an insert will just hide the problem.
- Measure the diagonals. Corner to corner, both directions. More than about ¼ inch of difference means the opening is out of square, and an insert forced into it will bind and eventually fail at the balances.
- Measure the width in three places — top, middle, bottom. Order to the smallest one. This is the single most common ordering mistake.
- Look for staining below the window, on the drywall or the framing in the basement below. Water getting past the old frame will keep getting past a new insert.
If all four check out, an insert is a genuinely reasonable DIY project. If any one fails, you want full-frame, and you want a contractor. It is roughly the same jump in difficulty as going from a slab swap to replacing a whole pre-hung entry door.
What you should expect to pay
Installed cost runs $400–$1,500 per window for vinyl and $800–$2,500 for wood or fiberglass. The unit itself is $300–$1,200; installation adds $100–$400 per opening.
| Material | Window price | Installed, per window |
|---|---|---|
| Vinyl (mainstream) | $200–$500 | $400–$900 |
| Vinyl (premium) | $400–$800 | $600–$1,400 |
| Fiberglass | $500–$1,000 | $800–$1,800 |
| Wood (paint-grade) | $500–$1,200 | $900–$2,000 |
| Aluminum-clad wood | $700–$1,500 | $1,000–$2,500 |
Two things to watch in a quote. First, whole-house bids are often priced per window at a discount, so a 10-window job should not be 10× the single-window price. Second, ask explicitly whether the price includes exterior capping and interior trim work — that is where a cheap-looking bid usually gets made up.
Which brand, and when the upcharge is worth it
Andersen, Pella, Marvin, Jeld-Wen and Milgard cover most of the U.S. market. For a typical house, Pella 250 or Andersen 400 lands in the value sweet spot around $700–$1,100 installed.
| Brand | Series | Material | Installed price |
|---|---|---|---|
| Andersen | 400-Series Woodwright | Wood, vinyl exterior | $900–$1,500 |
| Pella | 250 Series | Vinyl | $500–$1,000 |
| Pella | Impervia | Fiberglass | $800–$1,500 |
| Marvin | Essential | Fiberglass | $900–$1,800 |
| Jeld-Wen | V-4500 | Vinyl | $500–$1,000 |
Fiberglass is worth the premium in two situations specifically: strong coastal exposure, and walls that take hard afternoon sun. Vinyl expands and contracts more than fiberglass, and on a hot south or west elevation that movement is what eventually works the seals loose. Anywhere else, premium vinyl is the sensible buy.
How to tell your windows are actually done
Not every tired window needs replacing. These are the failures worth spending money on:
- Fog between the panes that never clears. The seal on the insulated glass unit has failed. On some brands the glass unit alone can be replaced for far less than the whole window — ask before you replace.
- The sash will not stay up. Usually just a failed balance, and often a $20–$60 part you can fit yourself. Do not let this alone sell you a new window.
- Rot at the sill or jambs. Structural, and the one that genuinely forces full-frame replacement.
- It fails the paper test. Close the window on a strip of paper. If it pulls out without drag, the weatherstripping is gone.
- Single-pane glass. Worth replacing on energy grounds alone in most climates.
Double-hung or single-hung?
Double-hung opens at the top as well as the bottom, which vents rising heat, and both sashes tilt in so you can clean the outside from indoors. That matters on upper floors where the alternative is a ladder. Single-hung is meaningfully cheaper with fewer moving parts, which makes it the sensible pick on ground-floor openings you can already reach from outside.
A practical compromise on a whole-house job: double-hung upstairs, single-hung down. On a ten-window house that is a few hundred dollars saved for no real loss.
Energy performance, honestly
A modern double-hung with double or triple glazing, a low-E coating and argon fill will hit a U-factor of 0.20–0.30 — essentially the same as any other operable style. Two moving sashes do create slightly more leak path than a fixed window, but decent weatherstripping brings that to 0.1–0.2 CFM per square foot, which is not the thing that will drive your bills.
If the goal is a smaller heating bill rather than comfort, the attic almost always pays back faster than the windows. ENERGY STAR puts the saving from replacing single-pane windows at roughly $100–$580 a year — that is for the whole house, not per window, and works out around 12–13% of a typical energy bill. Replacing already-decent double-pane windows will not pay for itself on energy savings, whatever the salesperson tells you — do that job for comfort, noise or looks, not for the maths.
Cleaning an upper-floor sash
Raise the bottom sash a few inches, release the tilt latches at the top of the sash — small tabs at each side — and rotate it inward. Clean the outside face from indoors, then swing it back until the latches click.
If the sash will not tilt, stop. Older spring-pivot sashes were never designed to and will break if you force them.
How long they last
Mainstream vinyl gives 20–30 years, premium vinyl and fiberglass 30–40, and wood 30–50 or more if the exterior is refinished every 5–10 years. The balance springs are the first thing to go, usually somewhere between year 10 and year 20, and they are a cheap user-replaceable part rather than a reason to buy new windows.
