Cost to replace windows

Here is what the per-window installed price actually looks like once you separate the variables that move it.

• Vinyl insert, double-pane, standard size: $450–$750
• Vinyl full-frame: $700–$1,100
• Fiberglass: $900–$1,600
• Wood or clad-wood: $1,000–$2,200
• Impact-rated laminated glass, vinyl or aluminium frame: $900–$2,000
• Bay or bow assembly: $2,000–$4,500 installed, and that is one opening

Labor is usually $150 to $400 of an insert replacement and $350 to $700 of a full-frame, because full-frame means removing trim, cutting nails, flashing the opening and putting the interior casing back. On a whole-house job the crew rate matters more than the sticker on the unit: a two-person crew doing eight inserts a day is a different cost structure from a carpenter doing three full-frames a day with siding work at each one.

Disposal is small but real — $15 to $40 per unit, more if the glazing is old enough that the putty is suspect.

An insert (sometimes called a pocket or retrofit window) drops a new sash and frame inside the existing frame. The exterior trim, the siding and the interior casing all stay put. It is faster, cheaper, and leaves the wall alone.

Full-frame takes everything back to the rough opening — frame, sill, flashing — and rebuilds it.

I'd take the insert on any house where the existing frame is sound and square. You keep the day rate down, you don't disturb the siding, and the glass performance is identical. You lose about an inch of visible glass on each dimension, which sounds trivial and looks noticeable on small windows.

Full-frame is the right call in three situations, and each of them is a condition rather than a preference: the sill or jamb is rotten, water has been getting past the flashing, or you are re-siding anyway and the flashing tie-in is free while the wall is open. Rot is not negotiable. Putting a new window inside a soft frame buys you a nice-looking assembly that is still rotting from behind, and you will pay twice.

The cost gap between the two is roughly $250 to $450 per opening. On fifteen windows that is $4,000 to $7,000, which is enough that a lot of contractors will quote insert without saying so. Ask which one is in the price. If the quote says "replacement window" and nothing else, it is an insert.

Vinyl is the default for good reasons: cheapest, no maintenance, thermally decent because the frame is hollow and chambered. It is also the one that looks cheapest, and in dark colours in strong sun the frames can bow. White and light colours are safe. Dark bronze on a west elevation in Phoenix or Orlando, less so.

Fiberglass costs 60–100% more than vinyl and expands and contracts at nearly the same rate as the glass it holds, so the seals last longer. If I were staying in a house for twenty years, this is what I'd buy.

Wood and clad-wood is a looks decision and an old-house decision. In a historic district it is often the only thing that gets approved. Interior wood, exterior aluminium cladding, and a price to match.

Aluminium conducts heat straight through unless it has a thermal break, so it is a poor choice in cold climates and common in warm ones where it is used for impact frames because it takes the load.

The frame is also where the warranty argument happens later. Vinyl warranties are usually lifetime on the frame and 10–20 years on the insulated glass unit seal, and it is the seal that fails — you see it as fog between panes. That is the failure mode to plan for, not the frame.

Anywhere in a Florida wind-borne debris region, along the Gulf, or on the Carolina and Texas coasts, the code question is not whether you want impact glass but whether the opening needs protection at all. The Florida Building Code requires openings in wind-borne debris regions to be protected either by impact-rated glazing or by an approved shutter system, and a permit for a window replacement in those counties will be checked against a product approval number.

Impact glass is two panes laminated to a PVB or SentryGlas interlayer, so it cracks and holds rather than leaving the opening. Budget $900 to $2,000 a window, roughly 60–100% over the same unit in ordinary double-pane. That is the honest premium, and it is not optional in those zones.

Two things people don't hear until later. First, the insurance credit is real — a wind mitigation inspection with all openings protected can knock 10–25% off a Florida homeowners premium, which changes the payback maths in a way energy savings never does. Get the inspection done after the job and file the form. Second, laminated glass also cuts noise meaningfully, typically 3–5 STC points over standard double-pane, which is why it turns up on houses nowhere near a coast.

Triple glazing is a different product for a different problem. It earns its price in climate zones 6 and 7, and it is mostly wasted money in zone 2.

New windows will not pay for themselves in energy savings. The numbers are not close.

Replacing single-pane windows with ENERGY STAR double-pane saves in the region of $125 to $465 a year for an average-sized home, per the ENERGY STAR estimates, and that is the best-case starting point — single-pane. Going from existing double-pane to better double-pane saves a fraction of that. Against a $12,000 job, the simple payback is fifteen to thirty years, and the seals in the glass units may fail before you get there.

If a salesperson leads with energy savings, they are selling the wrong benefit and you should treat the rest of the pitch with the same weight.

The honest reasons to replace windows:

• Rot. A sill that is soft is a wall problem that has not shown itself yet.
• Operation. Sashes that need two hands and a shoulder, balances that let the window drop, locks that no longer meet. In a bedroom this is an egress issue.
• Comfort. The cold-radiance effect near a single-pane window in January is real even when the air temperature is fine, and it makes a room's furniture layout unusable.
• Noise. Laminated glass on the street side of a house is one of the few upgrades people notice every single day.
• Fogged units. Once the seal is gone, the unit is done. You can sometimes replace the glass alone for $200–$400 rather than the whole window.

Comfort and rot are worth $12,000. A spreadsheet is not going to tell you that, which is why the spreadsheet argument keeps getting made badly.

Ask for the price broken out per opening, not as a lump. Sizes differ, and a lump sum hides which openings are carrying the cost.

Check for these lines, because their absence is where change orders come from: interior trim and casing, exterior capping or trim wrap, disposal, permit, and any rot repair contingency. Rot is the one that cannot be priced until the frame is out, so what you want is a stated hourly rate and material allowance for it, not silence.

Get the product approval or NFRC label numbers in writing. In a permit jurisdiction the inspector will want them, and it is the cleanest way to confirm that the unit installed matches the unit quoted.

Three quotes is the right number. The spread on window work is wide — 30% between reputable bidders on the same house is normal — and the middle quote with the clearest line items is usually the one to take.