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The old sash, stops and balances come out and a new unit drops into the existing frame, so your interior casing and exterior brickmould stay put. It is the faster and cheaper route, and the trade is glass area, roughly an inch to an inch and a half on each side, because you end up with a frame sitting inside a frame.
Everything comes out to the rough opening: the old jambs, the sill, and the sash weight pockets that sit empty behind the trim in most Bergen colonials and capes. The installer sets a new sill pan and flashing, insulates and seals the cavity, then rebuilds interior and exterior trim, which is the only honest fix for a rotted sill or an opening that has racked out of square.
A bay or bow is structural work, not a window swap. Expect a new header, a seat board over an insulated knee wall, a small roof with proper flashing and a gutter tie-in, and either cable support or knee braces to carry the projection.
Standard double pane sits around STC 28, which barely dents the drone off Route 4, Route 17 or I-80. Laminated glass with a PVB interlayer, or two panes of different thickness in one unit, typically moves you into the mid 30s, and sealing the frame and packing the old weight pockets does as much work as the glass does.
Exterior triple-track aluminum storms or low-E interior panels let you keep an original sash, which matters if your house falls under a town historic preservation commission. Typical range is $200 to $700 per opening, and pairing them with weatherstripping and sash cord repair closes much of the gap to a new double pane without touching the trim.
Two inch faux wood holds up in bathrooms and kitchens where real basswood cups in August humidity, and double cell cellular shades take the chill off a drafty north wall better than blinds do. Inside mount wants about two inches of flat jamb depth and closer to three for shutters, so on shallow old openings, or where a steam radiator sits under the sill, an outside mount or a roman shade is the better call.
Two things move a window number more than anything else: whether the opening takes an insert or has to be stripped to the framing, and which tier of the manufacturer's line you are actually buying. Bergen County labor runs above the national averages you see online, and rot repair, lead-safe containment on a pre-1978 house and the town permit all land on the invoice after the measure.
| Job | Typical range | What moves the number |
|---|---|---|
| Insert replacement window, installed | Typical range: $700 - $1,500 each | What moves the number: Size, product tier, and whether the trim stays |
| Full-frame replacement window, installed | Typical range: $1,200 - $2,800 each | What moves the number: Rot in the sill or jamb adds up fast |
| Bay or bow window, installed | Typical range: $4,000 - $10,000 | What moves the number: Header, seat board, roof and gutter tie-in |
| Whole house, 15 to 20 windows | Typical range: $14,000 - $40,000 | What moves the number: Insert versus full frame is most of that spread |
| Custom blinds or shades, installed | Typical range: $120 - $900 per window | What moves the number: Faux wood at the low end, shutters and motorized at the top |
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A real estimator opens the sash, presses a screwdriver into the sill and the bottom of the jamb, then tells you which openings can take an insert and which have to come out to the framing. If a proposal prices your whole house as inserts without that check, the number is a guess and change orders are coming. On an older colonial it is normal for a few openings, usually on the weather side that takes the wind-driven rain, to need full frame while the rest are fine.
"Energy efficient" means nothing on a proposal. Ask for the NFRC label values, U-factor and solar heat gain coefficient, and the exact product line rather than just the brand, since most brands sell three or four tiers of the same looking window. New Jersey sits in ENERGY STAR's North-Central zone, where the spec calls for a U-factor of 0.25 or lower, and a good double pane with low-E and argon lands there.
New Jersey's code treats a lot of like-for-like window replacement in one and two family homes as ordinary maintenance, but towns handle it differently and anything that changes the rough opening needs a permit. Bedroom escape windows generally have to keep a net clear opening of 5.7 square feet, and dropping an insert into an already small double-hung can quietly put you under that. If your house sits in a local historic district, the commission may have a say on material, grille pattern and exterior color, so find out before a custom order is placed.
Most Bergen County housing predates 1978, so the EPA renovation rule applies and the firm cutting into your trim should be Lead-Safe certified. Ask for the certification number, and expect plastic containment and HEPA cleanup on the interior side. Separately, New Jersey requires home improvement contractors to register with the Division of Consumer Affairs, carry commercial general liability insurance, and give you a written contract with the total price and the start and end dates on anything over $500.
Always verify before you pay a deposit. In New Jersey, home improvement contractors must be registered with the Division of Consumer Affairs and carry at least $500,000 in commercial general liability insurance. Ask for the HIC registration number and a certificate of insurance, and check the registration at njconsumeraffairs.gov. Any job over $500 must be in a written, signed contract.
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Insert means the new unit goes into your existing frame after the sash, stops and balances come out, so the interior casing and exterior brickmould stay. Full frame means everything comes out to the rough opening, including the sill and the empty sash weight pockets behind the trim. You need full frame when the sill or jamb is rotted, when the opening has racked out of square, when you want to change the size, or when you are pulling 1950s steel casements out of a split-level. Everywhere else an insert is fine and it runs roughly 30 to 40 percent less.
For energy alone, usually not by much. Going from a good low-E double pane around U-0.25 to a triple around U-0.18 saves real but modest money on a Bergen County heating bill, and the payback tends to stretch past how long people stay in the house. The better arguments are comfort, because the inner glass sits warmer and you lose that cold wash when you sit near a window in January, and less condensation on a humid morning. If noise is the actual goal, laminated glass in a double pane usually beats plain triple pane for less money.
Vinyl is the value pick and it is what most of Bergen County has. It moves more with temperature than the other two, which shows up on wide units and dark exterior colors on south and west walls, so ask about reinforced meeting rails on anything over about four feet. Fiberglass expands at close to the same rate as the glass it holds, so seals tend to stay tight longer, and it takes paint if you change the trim color later. Aluminum-clad wood costs the most and is usually the answer in a historic district or on a house where the interior trim is original stained wood you do not want to lose.
Plan on three to eight weeks between the final measure and the install date, because replacement windows are built to your opening and nothing is off the shelf. The install itself is quick. A crew doing inserts often handles eight to twelve openings in a day, while full frame runs two to four a day because of the flashing and trim work, and a bay or bow adds days for the structural and roof work. Custom blinds and shades usually run two to four weeks from measure and go in inside a couple of hours.
Yes, crews work through the winter and take one opening at a time, so the house is open for something like 20 to 45 minutes per window rather than all day. Two things to watch. Low-expansion foam and most exterior sealants have a minimum application temperature, often around 40 degrees, so the installer should be carrying cold-weather rated product or waiting out a hard freeze. Capping exterior trim in high wind is slow, sloppy work, so a nor'easter week gets rescheduled, and January and February are usually the shortest lead times of the year here.
Be careful here, because plenty of contractor websites still quote numbers that have expired. The federal 25C credit that covered 30 percent of window costs up to $600 a year ended for work placed in service after December 31, 2025. On the state side, New Jersey's Clean Energy Program has generally counted windows as part of a whole-house efficiency package rather than paying a standalone window rebate, and program terms change year to year. If a salesperson quotes you a rebate, confirm it with the program directly before you sign anything.
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